WO2002065620A1

WO2002065620A1 - Electric power system with engine-driven generator

Info

Publication number: WO2002065620A1
Application number: PCT/JP2002/001052
Authority: WO
Inventors: Shinji Hibi; Masayoshi Tokiwa
Original assignee: Yanmar Co.,Ltd.
Priority date: 2001-02-13
Filing date: 2002-02-07
Publication date: 2002-08-22

Abstract

An electric power system having a generator (3) driven by an engine (2), comprising inverters (6) for a plurality of armature windings (54) installed in the generator (3) and electric wires for self-power generation extending from the downstream side of the inverters (6) connected to external electric wires (U1, V1, W1) for connecting external power supplies (E1, E2) to electric power demand equipment (L1, L2), wherein the engine (2), the generator (3), and all inverters (6) are stored in one package (1), all inverters (6) or an engine starting battery (7) is stored in a door (5) hinged to the package (1), a power generating space (R2) for storing the engine (2) and the generator (3) and a door storing space (R3) of the door (5) for storing an inverter or battery storage portion are provided in the package (1) through partition walls (4), an opening (4a) allowing the power generating space (R2) to communicate with the door storage space (R3) is provided in the partition walls (4) and closed by a detachable partition plate (41), and the power generating space (R2) and the door storage space (R3) are allowed to communicate with a cooling air chamber (R1) allowing cooling air to pass therethrough.

Description

Description Power system with generator driven by engine

The present invention relates to a self-generating power system having a generator driven by an engine, which is connected to a power transmission system from an external power supply to a power consuming device (load). Background art

In recent years, by connecting the power transmission system of a generator driven by an engine (such as a gas engine) to the power transmission system from an external power supply (for example, a power company) to a power consuming device (load), an external power Many types of engine generators have been used, which can selectively or both supply electric power (external electric power) and electric power generated by the generator.

For example, with the development of the information-oriented society, it is essential to install load equipment such as computers and information communication equipment in offices and hospitals, and if the load equipment suddenly goes down during use, the data is lost. Trouble occurs. Therefore, as a backup power source for these load devices, an uninterruptible power supply (hereinafter referred to as “UPS”) has conventionally been installed in an electric room such as a basement of a building. The UPS has a battery and a battery that exchanges the DC power of the battery with AC power for load.The UPS operates when the power supply from the external power supply is stopped due to a power outage or the like. Until the generator is started, power is continuously supplied to the load equipment. Then, when a power outage occurs for a long time due to a disaster or the like, the engine-driven emergency generator is started up to charge the UPS and supply power to the load equipment.

There is also an electric power system that supplies electric power generated by a generator driven by an engine, in addition to such emergency use, in order to cover the demand for load by suppressing the purchase cost of external electric power during normal times. Among them, a co-generation system was provided with a hot water supply system utilizing waste heat generated by engines and generators during power generation. Things are also common. In other words, power and heat are simultaneously obtained by driving the prime mover.

However, when connecting the transmission system of the engine generator to an external power system or UPS, for example, the space in the electric room for installing the UPS is limited, and if an emergency generator is installed in addition to the UPS, In that case, the effective space is reduced. In the electrical room where the high-voltage power supply line is laid, it is desirable to secure the space such as the passage for the maintenance, and to secure the safety.

As a self-power generation system using such an engine generator, a system using a package containing an engine, a generator, and the like is known. In the case of the cogeneration system, a heat exchanger for hot water supply is housed in this package. Therefore, in order to reduce the size of the entire power system and secure the space for maintenance as described above, it is desirable to store, for example, an inverter as a UPS and a battery in this package. .

However, electrical equipment such as inverters and batteries are vulnerable to heat, so when storing them in a package, the effects of heat radiation from the engine and generator must be avoided. For this purpose, it is only necessary to separate the storage spaces for the electrical equipment and the engine generator, but in this case, it is necessary to arrange them so that they can be easily maintained, and also to allow sufficient cooling air to reach each. There must be. In addition, even if these electrical devices are stored, the entire package will be enlarged for that purpose, which does not satisfy the demand for compactness.

Separately from the connection to the external power system, conventionally, when the engine generator and electrical equipment are housed in one package like this, dedicated cooling fans are installed for each of the engine generator and electrical equipment. In addition, a storage box dedicated to Inver Evening was installed in the storage space for engines and generators that generate heat. However, providing a dedicated cooling fan is costly and leads to an increase in the size of the package as a whole, and if an exclusive box is installed in the same space as the heat source, the box will There is a problem that it becomes a hindrance when performing maintenance on other devices. When the UPS battery is stored in the package, this battery is originally provided in addition to the battery as the power supply for starting the engine in the package. This increases the number of parts, space, and cost.

In addition, there are single-phase and three-phase external power supplies.In the past, the packaged generator was compatible with either single-phase or three-phase generators. In a situation where power was also supplied to a three-phase load, it was necessary to provide a dedicated package for each. Disclosure of the invention

The present invention relates to a power system having a generator driven by an engine, comprising an inverter for each of a plurality of armature windings provided in the generator, and extending from a downstream side of each of the members. The main purpose is to provide a self-generated power line connected to an external power line connecting an external power source and a power demanding device in a compact configuration. In order to achieve the main object, in the present invention, the engine, the generator and the entire chamber are housed in one-third package.

Further, in such a packaged power system, in the case where the battery is provided with an inverter or an engine start, the battery serving as a heat generating source is protected from heat generated by the generator. A second object is to ensure the easiness of maintenance while securing a structure that is cooled by cooling air separate from the cooling air that cools the engine and the generator. In order to achieve the second object, according to the present invention, all of the battery or the battery is housed in a door hinged to the package to facilitate access and improve maintainability. ing.

Further, in order to protect the inverter or the battery stored in the door from heat generated by the engine and the generator, the package includes a power generation space in which the engine and the generator are stored, and a power generator for the door. Alternatively, a door storage space for storing the storage portion of the battery is provided through a partition wall. In such a structure, the partition wall is provided with an opening communicating with the power generation space and the door storage space, and the opening is closed and closed by a removable partition plate. In the evening, the heat resistance of the battery is secured, and at the time of maintenance, the partition plate is removed so that the inverter or the battery or the power generation can be easily made through the opening. Machine or the engine. Further, by connecting the power generation space and the door storage space to the cooling air chamber through which the cooling air flows, the cooling performance of the engine, the generator, the inverter, or the battery is ensured. And high-precision operation can be secured.

A third object of the present invention is to provide a power system having such a compact structure housed in a package so as to be appropriately usable as a self-generation system in connection with a power transmission system from an external power source. is there.

First, each inverter starts to output power when the demand power exceeds a predetermined value, and the output is set so that the output power of all inverters is equal, and usually, the output of all inverters is equal. The total output power in the evening is controlled to be smaller than the demand power. This can prevent reverse power flow. Here, “normal” means that the power supply from the external power supply is not interrupted.

Further, a fourth object of the present invention is to supply self-generated power to various types of loads (for example, single-phase and three-phase) having different power demands. In order to enable the power generated by the generator to be supplied without passing through the generator, at least one of the armature windings, preferably an armature winding not connected to the inverter, is connected to the generator. An automatic voltage regulator for adjusting the output voltage is provided. Accordingly, the power generation system can simultaneously supply self-generated power to a load operated by the output of the inverter and a load operated by the output from the armature winding without passing through the inverter. Therefore, in the event of a power outage, etc., power is supplied to this type of load not only when power from the external power supply to a load that does not pass through the inverter is interrupted, but also when power from the external power supply to the load that does not pass through the inverter is cut off. can do.

In this way, a single power generation system can supply self-generated power to each load that operates with a plurality of different types of power, for example, single-phase and three-phase, reducing installation space and cost. It can be suppressed.

Further, the present invention provides a battery as a power supply for starting an engine, which is housed in the package, and is used as a power supply for each of the inverters until power is output from the external power supply until the generator outputs power. use. As a result, in the event of a power outage, power can be supplied to each inverter immediately, and both batteries can be powered by one battery. This function has the effect of reducing the number of parts, reducing costs, and saving space.

The above and other objects, features, and advantages of the present invention will become more apparent from the following detailed description with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an internal right side view of an engine generator housing package 1 constituting a power system according to the present invention.

Fig. 2 is the same internal left side view.

FIG. 3 is an internal front view showing the front portions of the power generation chamber R2 and the heat exchange chamber R4. Fig. 4 is the same rear view.

FIG. 5 is a plan sectional view also showing the cooling air duct chamber R1 at the bottom.

FIG. 6 is a plan sectional view also showing the internal configuration of the power generation room R2 and the electrical equipment room R3.

FIG. 7 is a plan sectional view also showing the internal configuration of the heat exchange chamber R4 and the control chamber R5.

FIG. 8 is a system diagram showing a heat exchange system between engine cooling water and hot-water supply water incorporated in the package 1. As shown in FIG.

FIG. 9 is a perspective view showing a state in which the room 6 is stored in the electrical box door 5 of the package 1.

FIG. 10 is a perspective view showing a state in which the battery 7 is stored in the electrical box door 5 of the package 1.

FIG. 11 is a perspective view of the package 1 in a state where the electrical box door 5 is opened, the partition plate 41 is removed, and the power generation chamber R2 is opened.

FIG. 12 is a perspective view showing a ventilation structure of the electrical box door 5.

FIG. 13 is an electric circuit diagram when a single-phase three-wire power system is configured using the package 1.

Figure 14 shows the electric power when a three-phase power system is configured using the package 1. It is a circuit diagram.

FIG. 15 is a graph showing characteristics of external power, self-generated power, and demand power with respect to load using the power system of FIG. 13 or FIG.

FIG. 16 is an electric circuit diagram of a power system in the case where the package 1 is used as a single-phase / three-phase uninterruptible power generator.

FIG. 17 is a flowchart showing the flow of power control at the time of a power failure of the single-phase external power supply using the power system of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

The power system according to the present invention has a package containing an engine-driven power generator and the like. The power system package disclosed in Figs. 1 to 11 is designed to transmit power generated by a generator housed in the package (hereinafter referred to as "self-generated power") to a load. In addition to the structure described above, it is a cogeneration unit that also has a heat exchange system for hot water supply using the residual heat of the engine that drives the generator. Taking this as an example, the power system package of the present invention will be described.

Note that the package 1 of the present embodiment is normally installed in a manner shown in FIG. 1 (a power generation room R to be described later) so that an instrument panel formed of a controller 12 to be described later comes to the front. 2 with the right side and the electrical room R 3 with the left side), but for convenience of the explanation of the electrical box door 5 later, the engine 2 of the engine generator was placed at the back and the generator 3 was placed at the front. In the state, the following description will be given assuming that the side where the electrical equipment room R3 is disposed is the front side.

As can be clearly seen in Fig. 1, package 1 is composed of a total of five rooms: cooling air duct room R1, power generation room R1, electrical equipment room R3, heat exchange room R4, and control room R5. ing.

The power generation room R 2 occupies most of the lower space in the package 2, including an engine 2, a generator 3 driven by the engine 2, an air cleaner 8, an intake silencer 9, and a cooling water pump 1. 6. Exhaust gas heat exchanger 17 and sub muffler 18 are provided. The electrical room R3 is formed in front of the power generation room R2 in the package 2, and is isolated from the power generation room R2 by a partition wall 4 and a partition plate 41 (see FIG. 11). ing. In the electrical equipment room R3, electrical equipment that dislikes heat, for example, as shown in FIG. 9, an inverter 6, or as shown in FIG. 10, a battery 7 as a power supply for starting the engine is arranged. Yes, these electrical components are placed in the electrical component room R3 in a state of being stored in an electrical component door 5 hinged to the package 1.

The heat exchange chamber R4 is formed in the package 2 above the power generation chamber R2 and the electrical equipment chamber R3. In the heat exchange chamber R4, a lager night 11, a lager tufaan 14, a water / water heat exchanger 20 and an exhaust silencer 19 are arranged.

In addition, a control room R5 is configured by partitioning a part thereof (the right rear portion in the present embodiment), and a controller 12 and the like are disposed in the control room R5. Various instruments and operating tools are arranged on the outer surface of the controller 12 and an operation display panel 12a is provided.The side of the package 12 has a door 40 (see FIGS. 1, 9 to 10). (Refer to Fig. 11) is provided facing the operation display panel 12a. When the door 40 is opened, the operation display panel 12a is opened, and inspection and operation of the instrument display can be performed. It can be carried out. The cooling air duct chamber R1 is formed in the bottom of the package 2, that is, below the power generation chamber R2 and the electrical equipment room R3. The structure is such that it is sent into the power generation room R 2 and the electrical room R 3. The cooling air introduced from the cooling air duct room R1 into the power generation room R2 and the electrical equipment room R3 is exhausted to the heat exchange room R4 above the cooling air.

The engine 2 of this embodiment is a gas engine. The fuel gas to the engine 2 is sent from the fuel gas pipe 25 introduced into the package 1 to the mixer 15 through the regulator 10. On the other hand, the air is sent from the air pipe 24 to the mixer 15 through the air cleaner 8 and the intake muffler 9, where the fuel gas and the air are mixed by the mixer 15 and then supplied to the engine 2. After passing through the exhaust gas heat exchanger 17, the exhaust gas of the engine 2 is silenced by the sub silencer 18 and the exhaust silencer 19, and is exhausted to the outside.

In the power generation room R2, the engine 2 and the generator 3 are connected in the front-rear horizontal direction (in the direction of the crankshaft of the engine 2) to form an engine generator. The height of the generator 2 is larger than the height of the generator 3. Therefore, in the power generation room R2, a margin space is generated above the generator 3, and the air cleaner 8 and the intake muffler 9 are arranged in this space. In this way, the space R2 is made compact by effectively utilizing the space without waste.

Here, the hot water supply structure using the cooling water of the engine 2 configured by the package 1 will be described with reference to FIGS.

As shown in Fig. 8, etc., the cooling water CW of the engine 2 is circulated by the cooling water pump 16 between the engine 2, the water / water heat exchanger 20 and the Laje night 11 The water BW is introduced into the water Z water heat exchanger 20 through the hot water supply water inlet pipe 26, and the water water heat exchanger 20 removes the heat of the engine cooling water CW heated by the engine cooling. The hot water is supplied from the hot water supply water outlet pipe 27 as warm water.

The engine cooling water system will be described in detail. The engine cooling water CW is pressure-fed from the cooling water pump 16 to the exhaust gas heat exchanger 17 attached to the engine 2, and the exhaust gas heat exchanger 17 removes the heat of the exhaust gas. The water is introduced into the water jacket inside to cool each part of the engine 2, and then discharged from the engine cooling water outlet 21 to the temperature control valve 22.

If the temperature of the cooling water is equal to or higher than the set temperature, the temperature control valve 22 guides the cooling water to the water / water heat exchanger 20 for heating the hot water. When the temperature of the cooling water is lower than the set temperature, the water for hot water supply cannot be sufficiently heated, so the cooling water CW is sent to the cooling water pump 16 and again sent to the exhaust gas heat exchanger 17 to cool the engine. To be served.

After heating the hot water BW in the water / water heat exchanger 20, the cooling water is introduced into the temperature control valve 23. Here, if the temperature of the cooling water is equal to or higher than the set temperature, the cooling water CW is guided by the temperature control valve 23 to Lage 11 to be radiated, and then sent to the cooling water pump 16. Yes, if the temperature is lower than the set temperature, it is sent to the cooling water pump 16 without passing through Lage 11 so as not to be excessively cooled by heat radiation, and is again subjected to engine cooling.

As described above, only the cooling water CW having a certain temperature or higher is guided to the water Z water heat exchanger 20 to stably supply heat for heating the hot water BW. Regarding the cooling, the cooling water CW below a certain temperature was not sent to the Rajje 11 to avoid the temperature of the cooling water CW from dropping too much. By introducing cooling water CW from the heat exchanger 17, it is possible to avoid the situation where the performance of the engine 2 is degraded due to the low-temperature cooling water CW, and exhaust gas that needs particularly cooling is also engine-cooled. Cooling with relatively low-temperature cooling water CW, which is not warmed by the above, provides high cooling efficiency.

Next, the structure of the electrical equipment room R3 and the electrical equipment housed therein will be described with reference to FIGS.

As described above, the electrical room R3 is formed in front of the power generating room R2 via the partition wall 4 and the partition plate 41, and the electrical box door 5 is provided on the package 1 so as to be rotatable in the horizontal direction. When the electric box door 5 is closed and the electric box door 5 is closed, the electric box door 5 is placed in the electric room R4. As a result, the electrical equipment housed in the electrical box door 5 is arranged in the electrical room R4. In addition, when the electrical box door 5 is opened, that is, when the electrical box door 5 is rotated toward the user, the electrical equipment stored in the electrical box door 5 can be easily accessed.

The electrical box door 5 is a box having a front opening, and one of the right and left vertical ends of the front of the opening is hinged to the package 2 with one or more hinges 52 to serve as a door. Normally, the front opening is covered with a decorative plate 51. The decorative plate 51 may be attached to the electrical box door 5 with screws or the like, or may be hinged to the electrical box door 5 or the package 1 to form a door. If the front of the electrical box door 5 is opened by removing the decorative plate 51, etc., the electrical equipment housed in the electrical box door 5 is handled from the front while being placed in the electrical room R3. be able to.

In the present embodiment, the inside of the electrical box door 5 is divided into two upper and lower stages by a partition shelf 50. In the embodiment shown in FIG. 9, two invars are provided, one for each stage. To store. As shown in Fig. 11, a plurality of holes 5b for screw fitting are formed in the rear surface 5a of the electrical box door 5, and the chamber 6 is fixed to the electrical box door 5. In this case, each of the invar bars 6 arranged on the upper and lower stages is fixed to the rear surface 5a with a screw passing through the screw hole 5a from the rear side of the electrical box door 5.

In the embodiment shown in FIG. 10, the angles 53 are attached to the upper and lower stages, and the batteries 7 are stored in the upper and lower stages so as to be placed on the angles 53. In this way, the inside of the electrical box door 5 can be used as a space for storing the inverter and the space for storing the battery.These electrical devices are separated by the partition wall 4 and the partition plate 41. It can be arranged in the electrical equipment room R 3 in the package 1.

Further, of the two upper and lower tiers, one tier may be a storage space for the Invera 6 and the other tier may be a storage space for the battery 7.

Note that the number of storages of the battery 6 and the battery 7 in the electrical box door 5 is not limited to two, but may be one or three or more. When three or more storage units are to be stored, three or more storage spaces may be provided in the upper and lower stages, or other layouts may be considered.

As shown in FIG. 11, an opening 4 a is formed in the partition wall 4 that separates the power generation room R 2 and the electrical room R 3, and the opening 4 a is usually covered by the above-described partition plate 41. This protects the electrical equipment in the electrical compartment R3 from the heat from the engine 2 and the generator 3 generated in the power generator room R2. Then, when performing maintenance in the power generation room R2, as shown in Fig. 11, the electrical box door 5 is opened to make a space in front of the partition wall 4 and the partition plate 41, and further, the partition plate 41 is opened. By removing the opening 4, the opening 4a of the partition wall 4 is opened. Through this opening 4a, the operator can access the electrical equipment room R1 from the front of the package 1.

In the electrical compartment R1, a generator 3 is arranged in front of the engine 2 along the rotation axis direction, and an end cover 3a is attached to the front end of the generator 3. When the opening of the partition wall 4 is opened, the end cover 3a is detached, so that the rotor and the rotating shaft of the generator 3 can be replaced.

Furthermore, the inverter 6 and the battery 7, which are located in the electrical room R3 with the electrical box door 5 closed, are located very close to the generator 3 in the power room R2, and the wiring between the generator 3 and This simplifies the work and reduces the time required for wiring work.

If the partition wall 4 is not opened, or if the rotation axis directions of the engine 2 and the generator 3 are not the front and rear but the left and right direction, the worker will access the generator 3 for maintenance. Since it is not possible, or because it can be accessed only from the side rather than the axial direction of the generator 3, as a result, the entire generator 3 must be taken out of the power generation room R2, resulting in poor work efficiency. On the other hand, in the package 1 of the present embodiment, the access direction is coincident with the rotation axis of the generator 3, and the electric box door 5 is opened, and the opening 4 a of the partition wall 4 is further opened to generate power. Maintenance work is very easy because the machine 3 can be accessed in its axial direction.

Next, the structure of the cooling air passage in the package 1 will be described. Figures 1 to 7 show the flow of cooling air with arrows. As shown in FIG. 1 and the like, an outside air intake port 33 is opened on the rear end face of the package 1 (behind the engine 2 in the power generation chamber R2). No ,. At the outside rear of the package 1, an outside air introduction cover 37 extends below and below the outside air suction port 33, and the lower end opening is an outside air introduction port 32. Such a structure of the outside air introduction section prevents dust from entering the package 1 through the outside air intake port 33, and also reduces noise generated inside the package 1 from the engine 2, the generator 3, etc. To prevent leakage.

Inside the package 1, an intake duct 34 extends downward from the outside air intake port 33 behind the engine 2 and communicates with the air intake side of a blower 31 installed at the bottom of the power generation room R2. are doing. The air discharge side of the blower 31 communicates with the cooling air duct chamber R1 formed at the bottom of the package 1 as described above.

Thus, the outside air is sucked into the blower 31 via the outside air introduction cover 37 and the suction duct 34 formed at the rear of the package 1, and is introduced into the cooling air duct chamber R1 as cooling air by the blower 31. Be blown out.

As shown in FIG. 1 and FIG. 5, etc., the cooling air duct chamber R1 is formed over substantially the entire area around the bottom of the package 1.

As shown in FIG. 5, a large number of ventilation holes 35 are formed on the floor surface of the power generation room R2, and the cooling air duct room R1 and the power generation room R2 are formed through the ventilation holes 35. And are in communication.

As shown in FIG. 5, the ventilation holes 35 are arranged in a position overlapping with the engine 2 and the generator 3 in a plan view, that is, just below the engine 2 and the generator 3, so that the ventilation holes 35 are formed. The distance between the engine 2 and the generator 3 is shortened. In this way, the cooling air immediately after being blown out from the ventilation holes 35 into the power generation room R2 can be first blown to the engine 2 and the generator 3, thereby increasing the cooling efficiency of the engine 2 and the generator 3. I have.

As shown in FIG. 5 and FIG. 11, a large number of ventilation holes 45 are formed on the floor surface of the electrical equipment room R 3, and the cooling air duct room R is formed through the ventilation holes 45. 1 and the electrical equipment room R 3 communicate with each other.

As shown in FIGS. 5 and 10, a plurality of the communication holes 45 are juxtaposed in the width direction of the electrical equipment room R3 (vertical direction in FIG. 5), and the cooling air is uniformly distributed in the electrical equipment room R3. Is released.

Further, as shown in FIG. 12, a plurality of ventilation holes 48 are formed on the back surface 5a of the electrical box door 5, and a plurality of ventilation holes 49 are formed on the lower surface 5c, the upper surface 5d, and the partition 50. Thus, the space in the electrical equipment room R3 of the package 1 and the space in the electrical equipment door 5 are configured to communicate with each other. As a result, the cooling air introduced from the cooling air duct room R1 through the ventilation holes 45 into the electrical equipment room R3 is introduced into the electrical box door 5 through the ventilation holes 488, 49. Efficiently cools electrical equipment such as chamber 6 or battery 17 in box door 5.

As described above, the power generation room R2 and the electrical equipment room R3 are both disposed above the cooling air duct room R1 while being separated from each other by the partition wall 4 and the partition plate 41, and each has The cooling air duct R1 is connected to the cooling air duct chamber R1 through the holes 35 and 45, and the cooling air is separately introduced.

As described above, the heat exchange chamber R4 is disposed above the power generation chamber R2 and the electrical equipment room R3. 14 is forward, that is, above the generator 3 and the electrical room R 3 in the power generation room R 2, the water / water heat exchanger 20, the exhaust silencer 19, etc. are behind, that is, the power generation room R 2 It is located above the engine 2 inside. Further, a control room R5 for accommodating the controller 12 and the like is formed on one of the left and right sides of a portion where the water / water exchange room 20 and the exhaust muffler 19 are provided.

The heat exchange chamber R 4 and the power generation chamber R 2 above the engine 2 communicate with each other through the ventilation holes 36, and after cooling the engine 2, the generator 3, etc. in the power generation chamber R 2. The cooling air is introduced into the heat exchange chamber R4 through the ventilation holes 36, and cools the water / water heat exchanger 20, the exhaust silencer 19, and the like.

Also, from the electrical equipment room R3 to the upper part of the generator 3, heat exchange room R4 and power generation room R2- An upper and lower double plate structure is provided between the electrical equipment room R3 and the airflow duct 43 which opens an inlet 44 to the electrical equipment room R3 and communicates the outlet with the ventilation hole 36. That is, the cooling air after cooling the chamber 6 or the battery 17 in the electrical equipment room R 3 flows from the inlet 44 through the ventilation duct 43 and the ventilation hole 36, and again, the heat exchange room R 4 to cool the water / water heat exchanger 20 and the exhaust silencer 19 etc.

As shown in FIGS. 9 to 11, a radiator grill 42 for introducing outside air is formed on the front and left and right surfaces of the package 1 facing the radiator 11 in the heat exchange chamber R4. As shown in FIG. 5, due to the suction force of the Laje night fan 14, outside air is introduced through the Laje night grill 42, and the heat is released to the Laje night 11. Further, the radiator fan 14 is also introduced into the heat exchange chamber R4 through the above-described ventilation hole 36 to cool the water / water heat exchanger 20, the exhaust silencer 19, etc., and also cools the cooling air. The air is sucked into the 1st night and exhausted to the outside through the air outlet formed on the top of the package 1 together with the outside air from the radiator grill.

As described above, the outside air taken into the package 1 from the outside air suction port 33 flows from the cooling air duct room R 1 formed at the bottom of the package 1 to the power generation room R 2 -electrical room 1 ^ above the room. 3 and further passes to a heat exchange chamber R4 thereabove to efficiently cool each device disposed in the package 1.

That is, the engine 2 and the generator 3 in the power generation room R 2, which is particularly high in temperature, and the chamber 6 and the battery 7 in the electrical equipment room R 3, which must not be always kept at high temperature, are Cooling can be uniformly performed from below with fresh air that has just been taken in, so that an efficient and sufficient cooling effect can be obtained.

In the heat exchange chamber 7, relatively warm air after cooling the engine 2 and the generator 3 in the power generation chamber R2 is introduced through the ventilation holes 36, and the air is cooled by water / water heat. Since the heat is supplied to the heat exchanger 20, the water / water heat exchanger 20 can be prevented from being excessively cooled, and the heat exchange efficiency for hot water supply can be ensured.

Furthermore, by arranging the exhaust silencer 19 in the heat exchange chamber R4, the inside of the power generation chamber R2 can be made compact, and the engine 2 and the generator 3 are emitted from the exhaust silencer 19. Can be protected from high heat.

The controller 12 is separated from the heat exchange chamber R4 containing such a high-temperature element. Since it is arranged in the control room R5, the control function is not hindered.

In addition, for the heat dissipation of the Rajeshka 11, a Rajeshtafan 14 is provided separately from the blower 33, and a structure is provided to introduce the outside air from the Rajeshta grill 42. The overnight fan 14 also exhausts the cooling air blown out by the blower 33, so it is possible to secure a sufficient amount of outside air to be released for heat radiation at the Laje night 11 and to reduce the capacity of the blower 33. It can be suppressed.

The above is the package 1 and the internal structure thereof. The present invention further comprises an inverter 6 housed in the electrical box door 5 in the package 1 or an inverter 6 arranged outside the package 1. By self-connecting to the external power transmission system, it constitutes a self-generation system that can supply the power generated by the generator 3 to the load.

The power system shown in FIG. 13 is the first embodiment.

In the package 1, an engine 2, a generator 3 driven by the engine 2, and a water / water heat exchanger 20 configured in the package 1 shown in FIGS. 1 to 8 are included. It is installed and constitutes a hot water supply system using the residual heat of the engine 2. Note that a circulation circuit for engine cooling water CW is provided between the engine 2 and the water / water heat exchanger 20, and the water / water heat exchanger 20 Water distribution system for hot water supply water BW corresponding to water pipes 26 and 27 is drawn.

The rotating shaft 3 b of the generator 3 is connected to the output shaft of the engine 2, and a field winding (not shown) as a rotor is fixed to the rotating shaft 3 b inside the generator 3. A stator (not shown) is provided opposite to this. An armature winding 54 that outputs three-phase power is wound around the stator. Thus, the rotation of the rotating shaft 3b by the output of the engine 2 causes the field winding to rotate, and a voltage is generated in the armature winding 54 by electromagnetic induction to output three-phase power.

In addition, the generator 3 may be a rotating-electron-type generator having an armature on a rotor and a field winding on a stator.

The three-phase output from the armature winding 54 is rectified and smoothed by the diode 55 and the capacitor 56 and input to the DC input section of the inverter 6. Further, the package 1 is provided with the above-mentioned Laje night fan 14 and the engine star 57 for starting the engine 2. The star 57 is powered by a battery 7 located inside package 1 (or outside package 1).

The controller 12 provided in the package 1 includes a rotation value of the engine 2, a power value on a three-phase output line between the armature winding 54 and the diode 55, and an inverter. The input power value of the motor 6 and the like are input, and the output control of the engine 2 and the Lager toughan 14 is performed based on these.

In addition, the package 1 includes the above-described operation display panel 12 a provided with the operation means for operating the engine generator and the operation status display means, as well as the remote operation display 60. Signals can be exchanged with the controller 12.

Figure 13 shows a single-phase power system using such a package 1. From the single-phase external power source E 1, a single-phase three-wire external wire 61, that is, a U-phase wire 61 u, a neutral wire 61 o, and a V-phase wire 61 V are extended, By connecting the current transformer CT 1 to the line 61 u and the current transformer CT 2 to the V-phase line 61 V, the current value of the single-phase external wire 61 The input is calculated by the inverter 6.

In addition, a single-phase three-wire self-generating electric wire 62, namely a U-phase wire 62u, a neutral wire 62o, and a V-phase wire 62V, is extended from Inver 6 and the external wire 61 Connected to U-phase line 61 u, neutral line 61 o, V-phase line 61 V.

For a single-phase load L 1 · L 1 · · · · of a computer, etc., the connection point between both U-phase wires 6 1 u ■ 6 2 u, the connection point between both neutral wires 6 10 0-62 0, and The load wires 63 u, 63 o, and 63 v extend from the connection point between the V-phase wires 61 V and 62 V, respectively. The single-phase load L 1 is connected to any two of the three-wire load wires 63 u · 63 0 · 63 V according to the respective voltage values.

The battery 7 is connected to a self-generated power line U-phase line 62 u and a V-phase line 62 V via a transformer (not shown), and is supplied with power generated by the generator 3 or power from an external power source E 1. It is rechargeable. Then, at Star Night 37, Engine 2 is started. FIG. 14 shows a three-phase power system using the package 1. From the three-phase external power supply E 2, a three-phase external wire 64, that is, a U-phase wire 64 u, a V-phase wire 64 v, and a W-phase wire 64 w are extended, and the U-phase wire is By connecting the current transformer CT 1 to 64 u and the current transformer CT 2 to the W-phase wire 64 w, respectively, the current value of the three-phase external electric wire 64 is input to the inverter 6, and this is connected to the inverter. 6 is calculated. In addition, a three-phase self-generated power line 65, that is, a U-phase line 65u, a V-phase line 65v, and a W-phase line 65w are extended from Inver 6 and the U-line Connected to phase line 64 u, V phase line 64 v, W phase line 64 w.

From the connection point between both U-phase wires 6 4 u and 65 u, from the connection point between both V-phase wires 64 V and 65 V, and from the connection point between both W-phase wires 64 w 65 w, The U-phase line 66 u, the V-phase line 66 v, and the W-phase line 66 w which are the load power lines 66 are extended, and the three-phase load L 2 such as a pump is connected to the three lines 66 u 6 6 u V ■ 6 6 W are connected respectively.

In addition, the battery 7 is connected to any two of the internal power lines 65 u-65 V · 65 w via a transformer (not shown) (in this embodiment, the U-phase line 65 υ It is connected to the W-phase line 65 w), and can be charged with the power generated by the generator 3 or the power from the external power supply Ε2. Then, at Star Evening 57, Engine 2 is started.

In both of the power systems shown in Figs. 13 and 14, the demand power is supplied via external power lines so that the load 1 or L2 can be covered by the self-generated power generated by the generator 3. It is configured to calculate and to determine the output of Invar 6 according to the calculated value.

The power control of the power system of FIG. 13 will be described as a representative of both the power systems of FIGS. 13 and 14.

The graph shown in Fig. 15 shows the demand power (the power in the load wire 63) Wz, the inverting power (the power in the self-generated power wire 62) Wg, and the load (power consumption). External power (power in the external electric wire 61) shows the increase and decrease of We.

The demand power Wz is basically the sum of the external power We and the self-generated power (inver evening output) Wg. That is, Wz2We + Wg. In other words, the control of the inverse output W g is represented by the formula of W g = W z —We. That is The overnight output is determined depending on how much external power is taken.

By the way, when the required power Wz becomes smaller than the inveratorial output Wg (Wz <Wg), a reverse power flow from the self-generated power line 62 to the external power line 61 occurs. For this reverse flow is not to generate the inverter evening ₉ This reverse flow that occurs when the delayed (tracking of the demand power Wz) control of Wg when the demand power Wz decreases, extent fully loaded with an external power We It is necessary to keep the invar evening output Wg low. For this reason, as shown in Fig. 15, the invertor output Wg is always smaller than the demand power Wz so as to prevent reverse power flow.

In order to prevent reverse power flow, it is only necessary that the inverter output Wg be smaller than the demand power Wz, but the cost of purchasing external power will be increased by the difference wl between the two outputs Wg and Wz. Therefore, wl is set to a minimum value within a range where reverse power flow can be prevented.

As can be seen from FIG. 15, in the power system of the present embodiment, the entire target load area is divided into first to third control areas F 1, F 2, and F 3.

The first control area F 1 (0≤Wz <wl) is an area where the load is extremely small, that is, there is an extremely small amount of demand power Wz.Specifically, during the time when power demand is low, such as at night, etc. This is an area that assumes the power required to keep the power consuming equipment in standby without actually operating it, the auxiliary light in the room of the facility, and the demand power Wz. In this area, the inverter output Wg is set to 0, and power is supplied to the load only by the external power We that follows the demand power Wz.

Whether or not the demand power Wz is within the first control area F1 can be determined by detecting the external power value We via the current transformers CT1 and CT2. In other words, if the detected external power value We is 0≤We <wl, the inverter 6 does not output to the self-generated power line 62. Therefore, in the first control area F1, control is performed based on the following equation (1).

Wg = 0, Wz = We (0≤We <w 1) (1) The following second control area F 2 (w 1≤We≤w 1 + w2) has a large demand power Wz This is an area where there are many power consumption devices and facilities, such as during the daytime, when they actually operate, and the output characteristics of engine 2 (generator 3) are used. This is the area where internal power (inverter output Wg) can be used most efficiently. In this area F2, the inverter output is output according to the increase or decrease of the demand power Wz while supplying the external power We of w1 described above. In other words, when the external power We detected by the current transformers CT1 and CT2 is equal to or greater than w1, the inverter output Wg that follows the demand power Wz is output in order to keep this constant. This follow-up control of the evening output Wg is performed until the evening output Wg reaches the rated value w2.

Thus, in the second control area F2, power control is performed based on the following equation (2).

We = w 1 (constant value), Wz = Wg + wl (0 ≤ Wg ≤ w2) · · · (2) Note that, as described above, in particular, as described above, when the power demand Wz decreases, the invertor output W Occurs when the inverter output W exceeds the demand power Wz because the tracking decrease of g is delayed. To prevent this reverse power flow, the inverter output Wg must always be smaller than the demand power Wz. Therefore, at the time of test operation of each power system, wl is sufficient to avoid reverse power flow in response to the control delay characteristics and output fluctuation characteristics of the inverter, but reduces the purchase cost of external power. In order to suppress this, it is decided by tuning to set the minimum value among them. Although wl is kept constant in the power control graph shown in FIG. 15 and the above description, it may be changed according to the overnight output Wg or the output of the engine 2. In this case, a map of the inverter output Wg or w1 corresponding to the engine output is stored in the storage unit of the controller 12 or the like, and the external power W i detected by the current transformers CT 1 and CT 2 is stored. May be calculated according to the map so that the overnight output Wg at that time or w1 corresponding to the engine output is obtained.

If wl is set to a constant value, the largest control delay and inverter output ( The value of w1 must be set according to the fluctuation range of the engine output.

Whether wl is a constant value or a variable value may be selected according to the structure and use of the power system.

The third control area (Wz> wl + w2) has a very large demand power Wz, that is, a demand power Wz exceeding the sum of the instantaneous output Wg of the rated value w2 and the constant value w1. It is assumed that a power failure occurs, specifically, a case in which a plurality of high-load power consuming devices operate at the same time.

Due to the performance of Invera 6 and the performance of Engine 2 and Generator 3, Inno '— Evening output Wg is not output exceeding the rated value w2. Therefore, the demand power Wz belonging to this area is covered by the overnight output Wg of the rated value w2 and the external power We that follows the demand power Wz. In other words, when the external power We detected by the current transformers CT1 and CT2 exceeds w1 while the inverter output Wg has reached the rated value w2, the external power is calculated based on the following formula (3). The supply is made.

Wg = w2 (fixed value), Wz = We + w2 (We> wl) (3) In this third control area F3, reverse power flow because inverter output Wg is smaller than demand power Wz Does not occur.

The above power control as shown in Fig. 15 can also be adopted in a configuration in which the generator 3 is provided with a plurality of armature windings and a plurality of inverters, as in the power system shown in Fig. 16 below. is there. The power system shown in Fig. 16 is provided as an uninterruptible power generation system that continuously supplies power to the load by the generator 3 even when the power supply from the external power supply stops. There is no heat exchange system for hot water supply.

In FIG. 16, the same reference numerals as those used in FIGS. 13 and 14 indicate the same members or members having the same functions.

In this power system, in the generator 3, a plurality of armature windings 54 are assigned for single-phase and three-phase loads so that power can be supplied to both single-phase loads and three-phase loads. In the present embodiment, a plurality of armature windings 54a are used as single-phase armature windings, The winding 54b is a three-phase armature winding, but the number of each is not limited to this.

The three-phase output from each of the single-phase armature windings 54 a is rectified and smoothed via a diode 55 and a capacitor 56, and is input to the DC input section of each inverter 6. The three output terminals (U-phase / neutral-phase / V-phase) of each transmitter 6 are connected to the external electric wire 6 1 (61 u · 61 0 · 61 V) from the external power supply E 1 respectively. For the self-generated power line 6 2 (6 2 u • 6 20 · 6 2 v) connected to the load line 6 3 (6 3 u-6 3 o-6 3 v) to the single-phase load L1, Connected in parallel.

In this single-phase power system, the external power We and the self-generated power (inverter output Wg) can be combined and supplied to the load wire 63, so the power as shown in Fig. 15 above Control can be performed.

Then, as in the case of FIGS. 13 and 14, an arbitrary inverter 6 and an external power line U-phase line 61 uV-phase line 61 V are connected to the current transformer CT 1 ′ CT 2 Connected via. As a result, as described above, based on the control value w1 of the external power We set to prevent the reverse power flow, the inverter output Wg is output from the multiple inverters 6 to the self-generated power line 6 2 based on the control value w1. Done. That is, in this embodiment, the inverter output Wg shown in FIG. 15 means the total output of a plurality of inverters 6 provided one for each armature winding 54a.

Furthermore, when a plurality of inverters 6 are provided, the output power of all inverters 6 is made uniform to prevent reverse power flow.

However, the power system shown in Fig. 16 did not supply both external power and self-generated power as shown in Fig. 13 and simply caused a power outage in the external power transmission system. Only at times, a pure uninterruptible power generation system that supplies the power generated by the generator 3 to the load may be used. The configuration described below, which uses battery 7 as the power supply for starting the engine as the power supply for supplying power to the inverter 6, is based on this purely uninterruptible power generation system. In the power system that uses the power generated by the generator 3 in order to reduce the purchase cost of the engine 2, the power outage occurs when the engine 2 is stopped in the first control area F1 in FIG. When the power is cut off Using the battery 7 to supply power to the room 6 is also meaningful, as it may take some time for the battery to increase suddenly.

On the other hand, an AVR (automatic voltage regulator) 58 is provided on the armature winding 54b as a voltage adjusting means for the three-phase armature winding 54b. Adjust the output voltage of machine 54.

The output voltages of all the armature windings 54a and 54b may be uniformly adjusted by AVR58 by providing AVR58 on the field winding side of the rotor. The three wires of the three-phase load L2 are connected to the power switch 70. The power switch 70 has a three-phase external electric wire 6 4 (64 u · 64 V · 64 w) from the three-phase external power supply E 2 and a three-phase self-power generation from the armature winding 54 b. The electric wire 65 (65 u · 65 V · 65 w) is drawn in, and either the three-phase external wire 64 or the three-phase self-generated power wire 65 is selected as the three-phase wire. It shall be connected to the load L2.

Therefore, in the present embodiment, the three-phase power is not related to the power control on the assumption that the external power and the self-generated power are supplied simultaneously, as shown in FIG.

Further, in this embodiment, a battery 7 as a power source for starting the engine 2 is connected to a DC two-wire between the set of diodes 55 and the inverter 6, and the power of the battery It can supply to load L1. That is, when the power supply from the single-phase external power supply E1 stops due to a power failure, etc., the power is immediately supplied from the battery 7 to the inverter 6, and a single-phase load such as a computer that cannot be momentarily interrupted. L1 is supplied with a ¹ W g output from the chamber overnight.

As described above, since the battery 7 as the power source for starting the engine 2 is used as it is for power supply to the inverter 6 in an emergency, the number of batteries can be reduced, and the cost can be reduced. .

Also, when the engine 2 is operating, the electric power generated by the generator 3 is charged in the battery 7.

Reference numeral 59 denotes an AC-DC exchanger, which supplies power from an external power supply E1 to the inverter 6 as a power supply for operating the inverter 6 itself.

Figure 17 shows the case where this power system is provided purely as an uninterruptible power generation system. Fig. 3 shows the flow of power supply control to the single-phase load L1 at the time of a power failure of the single-phase external power system. The flow of this control will be described.

First, it is detected whether or not the power supply from the single-phase external power supply E1 has been cut off by a protection relay (not shown), that is, whether or not a power failure has occurred (step S1). When a power failure is detected, the battery 7 is immediately discharged to supply power to the inverter 6 (supply of DC power), and the inverter 6 converts this DC power to AC power, without interruption. The power supplied to the single-phase load L1 is backed up (step S2).

At this time, the star power 57 of the engine 2 is inspired by the DC power from the battery 7 at the same time to start the engine 2 and start the generator 3 (step S 3). Power is also supplied to the Laje night fan 14 to cool the engine 2. When the generated power from the generator 3 starts to be supplied to the single-phase load L1 in this manner, the discharge from the battery 7 is stopped by the control signal from the controller 12 and the battery 7 is charged by the generated power. (Step S4).

Eventually, when it is confirmed by the protective relay that the power supply from the external power supply E1 is restored (power failure is restored) (step S5), the supply of the external power to the single-phase load L1 is restarted. A control signal is output from the controller 12 to the generator 3, and the operation of the generator 3 is stopped.

The power supply to the three-phase load 25 such as a pump is temporarily stopped by stopping the power supply from the three-phase external power supply E2. Compared to single-phase loads 24, this is not a problem. In the event of a power outage, the three-phase load L2 cannot be used instantaneously, but by switching the power switch 70 and connecting the three-phase load L2 to the armature winding 54b, the generator 3 Is output to the three-phase load L2. Further, if the power of the battery 7 can be supplied to the three-phase self-generation power line 65, the three-phase power source is switched down immediately after the generator 3 starts generating power, that is, immediately after the power switch 70 is switched. Power can be supplied to the load L2. Industrial applicability The present invention is directed to a compact power system having the above-described packaged engine generator, which efficiently supplies the power of the generator to a load at normal times so as to suppress the purchase cost of external power. Or a so-called uninterruptible power generation system that can supply power generated by the generator to the load only when the external power system is out of power. In addition, various applications are possible in relation to the external power system.

Claims

The scope of the claims

1. A power system having a generator (3) driven by an engine (2), comprising an inverter (6) for each of a plurality of armature windings (54) provided in the generator (3). The self-power generation line extending from the downstream side of each of the inverters (6) is connected to the external power line (U 1 · E 2) connecting the external power source (E 1 ■ E 2) and the power demanding equipment (L 1-L 2). V

1 ■ The power connected to W1), wherein the engine (2), the generator (3) and the entire invar (6) are housed in one package (1). system.

2. The electric power system according to claim 1, wherein the whole invar evening (6) is housed in a door (5) hinged to the package (1).

3. In the package (1), a power generation space (R2) in which the engine (2) and the generator (3) are stored, and a door storage in which the invar evening storage portion of the door (5) is stored. A space (R3) is provided via a partition wall (4), and the power generation space (R2) and the door storage space (R3) communicate with the partition wall (4). An opening (4a) is provided, and the opening (4a) is closed by a detachable partition plate (4 1). The power generation space (R2) and the door storage space are provided.

3. The power system according to claim 2, wherein (R3) communicates with a cooling air chamber (R1) through which cooling air flows.

4. The battery according to claim 1, wherein a battery (7) for starting the engine (2) is housed in a door (5) hinged to the package (1). Power system.

5. The package (1) has a power generation space (R2) in which the engine (2) and the generator (3) are stored, and a door storage space in which the battery storage portion of the door (5) is stored. (R3) and a partition wall (4) In addition, the partition wall (4) is provided with an opening (4a) communicating the power generation space (R2) and the door storage space (R3), and the opening (4a) is connected to a detachable partition. It is characterized in that it is shielded by a cut plate (4 1), and the power generation space (R2) and the door storage space (R 3) are respectively connected to a cooling air chamber (R 1) through which cooling air flows. The electric power system according to claim 4, wherein:

6. Each of the inverters (6) starts to output power when the demand power exceeds a predetermined value, and the output is adjusted so that the output power of all the inverters (6) becomes equal, and 2. The power system according to claim 1, wherein normally, the total output power of all said inverters (6) is controlled to be smaller than said demand power.

7. A dynamic voltage adjusting device (58) for adjusting an output voltage of a generator is provided in at least one (54b) of the armature windings (54). Power system.

8. The automatic voltage regulator (58) is provided in place of the invar (6) of the armature winding (54b) to be subjected to the automatic voltage regulator (58). The power system as described.

9. The package (1) further contains a battery (7) as a power source for starting the engine (2), and the battery (7) is connected to the external power source (E

The power supply for the inverter (6) is used as a power source for each of the inverters (6) during a period from when the power from the power supply (1) is cut off to when the power is output from the generator (3). Power system.