CN101950992B - System frequency-modulation service implementation method based on electric automobile charging automatic switching control - Google Patents

System frequency-modulation service implementation method based on electric automobile charging automatic switching control Download PDF

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CN101950992B
CN101950992B CN2010102533214A CN201010253321A CN101950992B CN 101950992 B CN101950992 B CN 101950992B CN 2010102533214 A CN2010102533214 A CN 2010102533214A CN 201010253321 A CN201010253321 A CN 201010253321A CN 101950992 B CN101950992 B CN 101950992B
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charging
frequency
throwing
vehicle
charged state
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CN101950992A (en
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方勇杰
陈汹
罗剑波
孙玉军
任建锋
袁康
徐军
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Nari Technology Co Ltd
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Nanjing NARI Group Corp
State Grid Electric Power Research Institute
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Abstract

The invention belongs to the technical fields of electric power systems and an automation technology, providing a system frequency-modulation service implementation method based on electric automobile charging automatic switching control. The system frequency-modulation service implementation method comprises the following main steps of: (1) setting frequency fixed values corresponding to the situations when all charging trucks enter and exit a charging state in a charging station, according to system frequency-modulation requirements; (2), automatically registering and collecting charging information and bus frequency of each charging parking space in real time; (3) when the bus frequency falls sharply, controlling all the charging trucks in the charging station to exit the charging state completely at the same time; (4) calculating a switching priority coefficient of each truck and realizing power-frequency modulation characteristics of the linearized charging station by grouping the charging trucks and calculating the switching action frequency of each group; and (5) automatically executing charging switching control according to a measured value of the bus frequency. The invention can simply and reliably realize the automatic linear change of load along with system frequency deviation, without information communication among charging stations.

Description

Automatically throw system's frequency modulation service implementing method of moving back control based on charging electric vehicle
Technical field
The invention belongs to the Power System and its Automation technical field, the present invention relates to more precisely throw system's frequency modulation service implementing method of moving back control automatically based on charging electric vehicle.
Background technology
It on the frequency modulation question essence of electric power system the equilibrium problem of active power when normally moving.Because the real component of power system load is constantly to change, the frequency that keep system is a rated value, just must keep the balance of whole system active power constantly, and this is the requisite task of power system operation work.When normal operation, frequency generally is no more than ± 0.2Hz the deviation of rated value.
At present, general way is to control generated output constantly both at home and abroad, and follow load changes.Except the not enough situation of generate output when loading the peak, generally directly do not control load.
Along with increasing renewable energy power generation inserts electrical network; On the one hand; The fast characteristics of its intermittence, randomness, variation require as the conventional power supply capacity of peak regulation also more and more much; So that the reply frequency modulation service that renewable energy power generation is exerted oneself and changed to be provided, most on the other hand renewable energy power generations are difficult to possess fm capacity, cause the whole frequency modulation performance of system to reduce.All rely on conventional power supply and come frequency modulation, not only unreasonable on the Technological Economy, and when running into wind-powered electricity generation (or solar power generation) and sending out phase, heat supply in winter phase, water power greatly and highly overlap in time dry season, can cause the renewable energy power generation situation of difficult of dissolving.
If can dispatch load by generated output as dispatching at ordinary times, follow the tracks of the variation of generated output, just can play the effect that the frequency modulation service is provided for system as generator, thereby improve the ability that electrical network is admitted regenerative resource so that load.Requirement to this type load is to have enough fast response speed, can not cause electricity consumption client's attention when controlled basically.
The demand of charging electric vehicle is exactly in the regular hour, from electrical network, to draw a certain amount of electric energy; The time that automobile inserts electrical network generally be its battery actual needs charging time 2-3 doubly; This time difference can be fully utilized; Promptly through realizing the control that becomes more meticulous, charge under the prerequisite of demand satisfying client, for electrical network provides the frequency modulation service based on demand response to charging electric vehicle.Its advantage is, both had the fast characteristics of energy-storage system response, can as energy-storage system, can not cause extra energy loss in the adjustment process again.
Abroad, demand dispatch is one of important content of present intelligent grid research contents, utilizes charging electric vehicle to realize demand dispatch, the frequency modulation service is provided, also in the feasibility study process.
Summary of the invention:
This patent provides a kind of and has thrown system's frequency modulation service implementing method of moving back control automatically based on the charging electric vehicle that measures on the spot; Its purpose is to utilize the automatic throwing to charging electric vehicle in the charging station to move back control; Realize that the charging station load changes with the auto linear of system frequency deviation; Thereby through realizing demand dispatch automatically, for system provides the frequency modulation service.
To achieve these goals, the invention provides a kind of implementation step of throwing system's frequency modulation service implementing method of moving back control based on the charging electric vehicle that measures on the spot automatically:
1), sets frequency definite value f corresponding when all charging vehicles all drop into charged state in the charging station according to system's frequency modulation requirement Max, the frequency definite value f of correspondence when all withdrawing from charged state Min
2) register in the charging station battery rated capacity, the charging parking stall load level G of charging vehicle on each charging parking stall automatically i, the charging the current electricity price F in parking stall i, wherein i is the charging vehicle numbering;
3) gather the charge power P of charging station ac bus frequency f, each car in real time i, calculate each car level of charge C i, the charge power P that stands entirely ∑, bus frequency change rate df/dt;
4) when df/dt＜0 and | during df/dt| >=DFset, the full station of control charging vehicle all withdraws from charged state simultaneously, and wherein DFset is prior artificial setting value;
5) the minimum differential P of power is moved back in the throwing under the calculated rate certainty of measurement meaning MinJC, P wherein MinJC=P ∑f Acc/ (f Max-f Min), f AccBe the frequency measurement accuracy absolute value;
6) according to the charge power P of each car iOrdering obtains single charging vehicle maximum charge power P in the charging station MaxJC, get P MinJCAnd P MaxJCBoth maximums are moved back power stage difference P as current throwing JC
7) preferred number K is moved back in (1) throwing of calculating each car by formula i
K i＝C iF i/G i (1)
8) press K iBe worth ascending order with
Figure GSB00000895974000031
Minimized principle is divided into groups to all charging vehicles in the charging station, the charge power value P of feasible each group jBalancedly be distributed in P JCNear, wherein N is a charging vehicle group quantity, and j is a group number, and by formula the throwing deactuate working frequency f of j group is calculated in (2) when j＞1 j, when j=1, f j=f Max
f j = f max - ( f max - f min ) Σ k = 1 k = j - 1 P k / P Σ - - - ( 2 )
9) automatically perform charging according to the measured value of bus frequency f and throw and move back control, promptly as f＜f jAnd the duration of df/dt＜0 withdraws from j group charging vehicle from charged state during greater than a prior set point automatically; And as f>=f jAnd the duration of df/dt＞0 is dropped into charged state with j group charging vehicle during greater than a prior set point automatically, corresponding frequency definite value f when frequency retrieval to initial all charging vehicles all are in charged state Max, change step 2).
Beneficial effect
This patent provides a kind of and has angled charging electric vehicle to throw system's frequency modulation service implementing method of moving back control automatically based on measuring on the spot; Its advantage is the information communication that does not need between the charging station; Just can be simply, realize that load changes with the auto linear of system frequency deviation reliably, charge under the prerequisite of demand satisfying client, through the frequency modulation service is provided for system; Improve the admittance ability of electrical network, and help promoting applying of electric automobile regenerative resource.
Description of drawings
Fig. 1 is the flow chart of the inventive method.
Fig. 2 is a charging load merit performance diagram frequently.
Embodiment
Below in conjunction with accompanying drawing 1, for example the inventive method is described in detail.
Suppose that certain charging station has 6 cars in charging, its actual parameter is as shown in table 1.
Table 1 charging vehicle actual parameter
Figure GSB00000895974000041
What step 1 was described among Fig. 1 is according to system's frequency modulation requirement, to set frequency definite value f corresponding when all charging vehicles all drop into charged state in the charging station MaxBe 50.00Hz, the frequency definite value f of correspondence when all withdrawing from charged state MinBe 49.80Hz.
What step 2 was described among Fig. 1 is, registers in the charging station battery rated capacity of charging vehicle, charging parking stall load level G on each charging parking stall automatically i, the charging the current electricity price F in parking stall i, wherein i is the charging vehicle numbering.
What step 3 was described among Fig. 1 is to gather the charge power P of charging station ac bus frequency f, each car in real time i, calculate each car level of charge C i, the charge power P that stands entirely ∑, bus frequency change rate df/dt.According to table 1, P ∑=31kW.
What step 4 was described among Fig. 1 is, when df/dt＜0 and | during df/dt| >=0.5Hz/s, the full station of control charging vehicle all withdraws from charged state simultaneously.Suppose that above-mentioned condition does not satisfy, and continues execution in step 5.
What step 5 was described among Fig. 1 is that the minimum differential P of power is moved back in the throwing under the calculated rate certainty of measurement meaning MinJC, P wherein MinJC=P ∑f Acc/ (f Max-f Min), f AccBe the frequency measurement accuracy absolute value.If f Acc=0.01Hz, then P MinJC=31 * 0.01/ (50.00-49.80)=1.55kW.
Step 6 description is among Fig. 1, according to the charge power P of each car iOrdering obtains single charging vehicle maximum charge power P in the charging station MaxJC, get P MinJCAnd P MaxJCBoth maximums are moved back power stage difference P as current throwing JCAccording to table 1, single charging vehicle maximum charge power P MaxJCBe the power 10kW of the 4th charging vehicle, power stage difference P is moved back in then current throwing JCBe taken as P MinJCAnd P MaxJCBoth maximum 10kW.
What step 7 was described among Fig. 1 is, preferred number K is moved back in (1) throwing of calculating each car by formula i
K i＝C iF i/G i (1)
Preferred number K is moved back in the throwing that calculates each car according to actual parameter in the table 1 i, as shown in table 2.
Preferred number K is moved back in the throwing of each car of table 2 i
Numbering i Preferred number K is moved back in throwing i
1 0.069
2 0.099
3 0.165
4 0.139
5 0.035
6 0.198
What step 8 was described among Fig. 1 is to press K iBe worth ascending order with Minimized principle is divided into groups to all charging vehicles in the charging station, the charge power value P of feasible each group jBalancedly be distributed in P JCNear, wherein N is a charging vehicle group quantity, and j is a group number, and by formula the throwing deactuate working frequency f of j group is calculated in (2) when j＞1 j, when j=1, f j=f Max
f j = f max - ( f max - f min ) Σ k = 1 k = j - 1 P k / P Σ - - - ( 2 )
Table 3 is by K iBe worth ascending order to all charging vehicle ranking results in the charging station, table 4 is group result, and table 5 moves back frequency for the every group of throwing that calculates according to formula (2).6 charging vehicles have been divided into 3 groups, i.e. N=3.
Table 3 ranking results
Preferred number K is moved back in throwing i Numbering i Charge power (kW)
0.035 5 4
0.069 1 6
0.099 2 2
0.139 4 10
0.165 3 3
0.198 6 6
Table 4 group result
Figure GSB00000895974000062
Table 5 is thrown for every group and is moved back frequency
Group number j This group is thrown and is moved back frequency (Hz)
1 50.00
2 49.94
3 49.86
Obtain merit as shown in Figure 2 characteristic curve frequently thus, wherein P is a full station charge power.
What step 9 was described among Fig. 1 is, automatically performs charging according to the measured value of bus frequency f and throws and move back control, promptly as f＜f jAnd the duration of df/dt＜0 withdraws from j group charging vehicle from charged state during greater than a prior set point automatically; And as f>=f jAnd the duration of df/dt＞0 is dropped into charged state with j group charging vehicle during greater than a prior set point automatically, corresponding frequency definite value f when frequency retrieval to initial all charging vehicles all are in charged state Max, change step 2.
In a word; A kind of based on the automatic system's frequency modulation service implementing method of moving back control of throwing of the charging electric vehicle that measures on the spot; Adopt the real-time on the spot metrical information of charging station, form the power-frequency adjustment characteristic of charging station, implement the automatic throwing of charging electric vehicle and move back control; Realize that the charging load changes with the auto linear of system frequency deviation; Thereby for electric power system provides the frequency modulation service, reach through demand dispatch, satisfy client charge improve under the prerequisite of demand electrical network to the admittance ability of regenerative resource, promote the purpose that electric automobile is applied.

Claims (4)

1. throw system's frequency modulation service implementing method of moving back control automatically based on charging electric vehicle, it is characterized in that, may further comprise the steps:
1), sets frequency definite value f corresponding when all charging vehicles all drop into charged state in the charging station according to system's frequency modulation requirement Max, the frequency definite value f of correspondence when all withdrawing from charged state Min
2) register in the charging station battery rated capacity, the charging parking stall load level G of charging vehicle on each charging parking stall automatically i, the charging the current electricity price F in parking stall i, wherein i is the charging vehicle numbering;
3) gather the charge power P of charging station ac bus frequency f, each car in real time i, calculate each car level of charge C i, the charge power P that stands entirely ∑, bus frequency change rate df/dt;
4) when df/dt＜0 and | during df/dt| >=DFset, the full station of control charging vehicle all withdraws from charged state simultaneously, and wherein DFset is prior artificial setting value;
5) the minimum differential P of power is moved back in the throwing under the calculated rate certainty of measurement meaning MinJC, P wherein MinJC=P ∑f Acc/ (f Max-f Min), f AccBe the frequency measurement accuracy absolute value;
6) according to the charge power P of each car iOrdering obtains single charging vehicle maximum charge power P in the charging station MaxJC, get P MinJCAnd P MaxJCBoth maximums are moved back power stage difference P as current throwing JC
7) preferred number K is moved back in (1) throwing of calculating each car by formula i
K i＝C iF i/G i (1)
8) press K iBe worth ascending order with
Figure FSB00000895973900011
Minimized principle is divided into groups to all charging vehicles in the charging station, the charge power value P of feasible each group iBalancedly be distributed in P JCNear, wherein N is a charging vehicle group quantity, and j is a group number, and by formula the throwing deactuate working frequency f of j group is calculated in (2) when j＞1 j, when j=1, f j=f Max
f j = f max - ( f max - f min ) Σ k = 1 k = j - 1 P k / P Σ - - - ( 2 )
9) automatically perform charging according to the measured value of bus frequency f and throw and move back control, promptly as f＜f jAnd the duration of df/dt＜0 withdraws from j group charging vehicle from charged state during greater than a prior set point automatically; And as f>=f jAnd the duration of df/dt＞0 is dropped into charged state with j group charging vehicle during greater than a prior set point automatically, corresponding frequency definite value f when frequency retrieval to initial all charging vehicles all are in charged state Max, change step 2).
2. according to claim 1 based on the automatic system's frequency modulation service implementing method of moving back control of throwing of charging electric vehicle; It is characterized in that; In the said step 4), judge whether to control full station charging vehicle through the rapid decline that detects the bus frequency and all withdraw from charged state simultaneously.
3. according to claim 1 based on the automatic system's frequency modulation service implementing method of moving back control of throwing of charging electric vehicle, it is characterized in that preferred number K is moved back in the throwing of each car in the said step 7) i, taken all factors into consideration level of charge, load level and the charging electricity price of parking stall.
4. according to claim 1 based on the automatic system's frequency modulation service implementing method of moving back control of throwing of charging electric vehicle, it is characterized in that the throwing deactuate working frequency f in the said step 8) jComputational methods, realized linearizing charging station power-frequency adjustment characteristic.
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CN102938094B (en) * 2012-11-08 2015-11-25 浙江工业大学 The charging electric vehicle sequential participating in frequency modulation service is determined and service vehicle system of selection
CN105095982B (en) * 2015-03-26 2018-09-07 电子科技大学 A kind of electric vehicle participation power grid frequency modulation dispatching method based on running model
CN104836292B (en) * 2015-05-08 2017-01-25 山东大学 Electric automotive charging pile control system with considered electric network frequency safety, and method thereof
CN110492512B (en) * 2019-09-12 2020-10-23 合肥工业大学 Control method for frequency modulation or peak regulation mode in optical storage combined system

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Publication number Priority date Publication date Assignee Title
US5594318A (en) * 1995-04-10 1997-01-14 Norvik Traction Inc. Traction battery charging with inductive coupling
CN1877952A (en) * 2005-06-10 2006-12-13 北京机电研究所 Electric automobile charging station
CN101800438A (en) * 2010-04-28 2010-08-11 王兴昆 Method and equipment for construction of mobile storage-type electric vehicle rapid charging station system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5594318A (en) * 1995-04-10 1997-01-14 Norvik Traction Inc. Traction battery charging with inductive coupling
CN1877952A (en) * 2005-06-10 2006-12-13 北京机电研究所 Electric automobile charging station
CN101800438A (en) * 2010-04-28 2010-08-11 王兴昆 Method and equipment for construction of mobile storage-type electric vehicle rapid charging station system

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