CN104333020A - Power system real-time low frequency oscillation analysis and optimal correction control method - Google Patents

Abstract

The invention relates to a power system real-time low frequency oscillation analysis and optimal correction control method. The real-time operation data report and formation unit parameter data report of a power grid are obtained through a data acquisition module, and a CIM model file original data report and an e format file original data report are analyzed through a data analysis module. The analyzed data reports are subjected to power flow calculation and static stability calculation through a calculation execution module by using a power flow program and a low frequency oscillation analysis program. If a static voltage stability region is insufficient, a low frequency oscillation analysis optimal correction control program is started to carry out adjustment correction. A calculation result report is outputted and is used for guiding operation staff to work. According to the power system real-time low frequency oscillation analysis and optimal correction control method, the establishment of the static and stable operation mode of the power grid becomes simple and easy, the working process and making time are shortened, the working strength and pressure of the operation staff is reduced, and the voltage quality and security and stability of power grid operation are improved comprehensively.

Description

A kind of real-time Low Frequency Oscillation Analysis of electric power system and optimum Corrective control method

Technical field

The present invention relates to low-frequency oscillation analysis and optimization field, particularly relate to the real-time Low Frequency Oscillation Analysis of electric power system of a kind of optimal load flow containing damping ratio constraint and characteristic value optimization and optimum Corrective control method.

Background technology

Along with the quick growth of economy and population, the demand of people to electric energy constantly increases, and power system load is constantly increased the weight of.Power System Interconnection has many advantages, but also easily occurs complicated stability problem.Meanwhile, the new stage of bulk power grid, large-sized unit, trans-regional networking has been stepped in electric power system, and these factors easily cause the generation of low-frequency oscillation.If low-frequency oscillation can not get effective suppression, more serious fault will be caused, cause large-area power-cuts, even system splitting, produce huge economic loss.

The main harm of low-frequency oscillation to electrical network is presented as that vibration is out of control and causes Out of step off-the-line.The measure of power oscillation damping conventional at present comprises: install series compensator additional and shorten electrical distance, installing Static Var Compensator (SVC) additional provides dynamic electric voltage to support, adopt direct current transportation, the additional control functions such as unit PSS, direct current PSS/PSD (power swing damping) are installed, many direct currents coordinated control system etc.But the input of these equipment can not to ensure in system cloud gray model just low-frequency oscillation not to occur, how whether there is low-frequency oscillation in correct anticipation power system operation, how about become the focus of research both at home and abroad based on the Corrective control method of generation escheduling methods in recent years.

Corrective control, exactly by arranging again controlled variable in system.For the problem being improved fail safe by Corrective control, that commonly uses at present has two kinds of methods: Sensitivity Analysis Method and optimal method.From disclosed document, research in this respect abroad starts from 2004, and first kind method is the sensitivity calculations based on damping ratio under ground state, carries out Serial regulation to each generator output, to meet the requirement of small interference stability; Equations of The Second Kind is the expection security costs optimal load flow model containing small interference stability constraint, and this model considers the service conditions before fault and a series of forecast failure collection; Small interference stability constraint is then converted into Smallest Singular Value of Matrices constraint by the 3rd class, and by some approximation techniques, each iteration asks for the derivative of minimum singular value, then incorporates interior-point algohnhm and solve; 4th class utilizes first order Taylor series expansion, by spectrum abscissa function, unit is gained merit the one order explicit expression small interference stability constraint of exerting oneself, and it is joined traditional OPF model, realize the solution procedure of the interleaved computation of small interference stability constrained optimum trend and Eigenvalue Sensitivity.The method also contemplates the voltage stabilization under heavy load conditions, and the result after its calculating both ensure that small interference stability, in turn ensure that voltage stabilization, and the calculating of several large scale system shows that the method computational speed is fast, and robustness is good, has application prospect more widely.

Summary of the invention

Can technical problem to be solved by this invention is through getting back to stable state after being subject to microvariations after a period of time for existing electric power system, utilize the method for optimum Corrective control, a kind of preventative regulation measure of low-frequency oscillation of electric power system is provided, to improve the stability of evaluated electric power system, make it to be in the power system operating mode of safety and stability all the time.

In order to solve the problems of the technologies described above, the present invention by the following technical solutions:

A kind of real-time Low Frequency Oscillation Analysis of electric power system and optimum corrective control, comprise data acquisition module, data resolution module, calculating Executive Module, optimum Corrective control module and system management module; Data acquisition module, obtains real-time CIM file initial data form, e formatted file initial data form and forms unit supplemental characteristic form; Data resolution module, utilizes self-defining data interface that CIM file initial data form and e formatted file initial data form are converted to the formatted data form needed for calculation procedure; Calculate Executive Module, adopt flow calculation program and Low Frequency Oscillation Analysis program to calculate user-defined format data sheet; Optimum Corrective control module, adopts and is optimized containing the optimal load flow of damping ratio constraint and the low-frequency oscillation Corrective control program of characteristic value optimization initial data form, corrects; System management module, completes the setting of relevant parameter.

The control method adapted with above-mentioned control system, comprises the following steps:

Step one, obtains real-time CIM file initial data form, e formatted file initial data form and unit parameter initial data form;

Step 2, adopt data-interface to resolve initial data form, CIM file initial data form, e formatted file initial data form and unit parameter initial data form are converted into the user-defined format data sheet needed for Load Flow Program, Low Frequency Oscillation Analysis program and optimum Corrective control program;

Step 3, utilizes Load Flow Program to carry out Load flow calculation to the real-time format data sheet after conversion;

Step 4, adopts Low Frequency Oscillation Analysis program to carry out static state stability calculation to system based on calculation of tidal current;

Step 5, checks static state stability calculation destination file, and whether judged result exists real part is greater than the characteristic value of zero or the value of damping ratio deficiency; If do not exist, then think that this system is statically stable; If exist, then easily there is low-frequency oscillation in system, starts the optimum Corrective control program of Low Frequency Oscillation Analysis;

Step 6, start the optimum Corrective control program of Low Frequency Oscillation Analysis, carried out corrections arrange calculating the control variables of electric power system or constraints, adopt and electric power system is analyzed and solves containing the optimal load flow of damping ratio constraint and characteristic value optimization method, acquisition correction control data; Wherein, control variables comprises generator active power and PV node voltage, and constraints comprises the upper and lower bound of the active power of generator and the upper and lower bound of reactive power and node voltage;

Step 7, checks the result of calculation file after correction, and export result of calculation form, this result can ensure that evaluated electric power system is in the mode of safely and steadily running, and this power system operating mode is the safe and stable operation limit of evaluated electric power system;

As preferably, in step one, the data obtained are the real-time running data of electrical network;

As preferably, in step 2, while node parses is carried out to the network configuration and service data that include evaluated electric power system, also the network configuration and service data that include evaluated electric power system are carried out to the process of node equivalence.

As preferably, in step 6, described constraints also comprises system load flow constraint, for ensureing that evaluated electric power system meets system load flow constraint all the time.

As preferably, in step 7, the result of calculation form of output after optimum has corrected, the meritorious regulating power including the characteristic value result of calculation after optimization and generator in form regulates for operations staff's reference.

This programme is by calculating the real-time running data of current power system, analyze current system and whether can keep stable after experience microvariations, if system loses stable, then optimize control variables or the constraints of evaluated electric power system, exert oneself to the unit of evaluated electric power system is meritorious, unit is idle exerts oneself, PV node voltage carries out cooperation control, the optimizing operation collocation strategy that the evaluated power system safety and stability that gives one's hand runs, effective prevention evaluated electric power system generation low-frequency oscillation, and then improve evaluated power system safety and stability operation level, guarantee the electricity net safety stable reliability service of evaluated electric power system.

Compared with prior art, the present invention possesses following beneficial effect:

1, evaluated electric power system contingent low-frequency oscillation in running can be prevented, and stability limit optimization calculating can be carried out to the electrical network of evaluated electric power system, realize the electrical network of evaluated electric power system under any operational mode, the power system operating mode optimization data needed for evaluated power system static safe and stable operation is obtained by damping ratio constrained optimum trend correction calculation program, and can automatically calculate by operation of power networks method optimizing data and verify, its the result can be directly used in the power system operating mode instructing the evaluated power system static safety and stability of establishment, to guarantee electricity net safety stable reliability service.

2, the formulation of the static security stable operation mode of electrical network can be made to become simple, shorten workflow and formulation time, alleviate operations staff's working strength and pressure, improve quality of voltage and the security and stability of operation of power networks comprehensively.

Accompanying drawing explanation

Fig. 1 is the structured flowchart of the real-time Low Frequency Oscillation Analysis of electric power system of the present invention and optimum corrective control.

Fig. 2 is the schematic process flow diagram of the real-time Low Frequency Oscillation Analysis of electric power system of the present invention and optimum Corrective control method.

Embodiment

Involved in the present invention to explanation of nouns be:

Low-frequency oscillation: refer under the effect of microvariations, the rotor angle of generator, rotating speed, and related electric amount, as the vibration of frequency between 0.1 ~ 2.5Hz of approximate constant amplitude or amplification occurs for line power, busbar voltage etc.

Load flow calculation: refer to that electric power system is under a certain operational mode determined and the mode of connection, calculates electric power system voltage, the size and Orientation of electric current and distribution situation of power everywhere from power supply to load.

Optimal load flow (Optimal Power Flow, OPF): refer to when the structural parameters of system and load condition are all to timing, regulate available control variables (as output of a generator, adjustable transformer tap etc.) to find and can meet all operation constraints, and the trend distribution under making a certain performance index of system (as cost of electricity-generating or via net loss) reach optimal value.

, there is not spontaneous oscillation or aperiodicity step-out, automatically revert to the ability of initial operating state in steady stability: after referring to that electric power system is subject to microvariations.

Steady stability constrained optimum trend: refer to the optimal load flow of constraints using steady stability as constraint at optimal load flow.

Steady stability constrained optimum trend, for the microvariations point of instability that may exist, calculates by optimizing, and analyzes and provide to meet steady stability requirement optimized operation scheme completely, to improve safe operation of electric network and stability.

The optimum corrective control model of steady stability is as follows:

1) target function to be optimized is: the generator active power summation of adjustment is minimum.

$\min \underset{i\∈S_G}{\mathrm{\Σ}}\mathrm{\Δ}{P}_{\mathrm{Gi}}$

Wherein: S _gfor the set of generator node

2) constraints comprises equality constraint and inequality constraints condition.

1. equality constraint:

A) each node power flow equation in network.

$\left\{\begin{array}{c}{P}_{\mathrm{Gi}}-P_{\mathrm{Di}}-\underset{{j\∈S}_N}{\mathrm{\Σ}}{V}_i{Y}_{\mathrm{ij}}{V}_j\cos {\mathrm{\δ}}_{\mathrm{ij}}=0\\ Q_{\mathrm{Gi}}-Q_{\mathrm{Di}}-\underset{{j\∈S}_N}{\mathrm{\Σ}}{V}_i{Y}_{\mathrm{ij}}{V}_j\sin {\mathrm{\δ}}_{\mathrm{ij}}=0\end{array},i\∈S_N\right.$

Wherein:

V _i: the amplitude of the i-th node voltage;

Y _ij: the element magnitude of node admittance matrix;

δ _ij＝δ _i-δ _j-α _ij；

δ _i: the phase angle of the i-th node voltage;

δ _j: the phase angle of jth node voltage;

α _ij: the element phase angle of node admittance matrix;

S _n: system node set.

B) generator Initial Value Equation.

For the quadravalence model of generator, the DC excitation system of IEEE-I type installed by every platform generator, can obtain following formula:

$\left\{\begin{array}{c}{P}_{\mathrm{Gi}}-V_i{I}_{\mathrm{di}}\sin ({\mathrm{\δ}}_i-{\mathrm{\θ}}_i)-V_i{I}_{\mathrm{qi}}\cos ({\mathrm{\δ}}_i-{\mathrm{\θ}}_i)=0\\ Q_{\mathrm{Gi}}-V_i-I_{\mathrm{di}}\cos ({\mathrm{\δ}}_i-{\mathrm{\θ}}_i)+V_i{I}_{\mathrm{qi}}\sin ({\mathrm{\δ}}_i-{\mathrm{\θ}}_i)=0\\ E_{\mathrm{di}}^{\′}-V_i\sin ({\mathrm{\δ}}_i-{\mathrm{\θ}}_i)-R_{\mathrm{si}}{I}_{\mathrm{di}}+X_{\mathrm{qi}}^{\′}{I}_{\mathrm{qi}}=0\\ E_{\mathrm{qi}}^{\′}-V_i\cos ({\mathrm{\δ}}_i-{\mathrm{\θ}}_i)-R_{\mathrm{si}}{I}_{\mathrm{qi}}-X_{\mathrm{di}}^{\′}{I}_{\mathrm{di}}=0\\ E_{\mathrm{di}}^{\′}-(X_{\mathrm{qi}}-X_{\mathrm{qi}}^{\′})I_{\mathrm{qi}}=0\\ E_{\mathrm{fdi}}-E_{\mathrm{qi}}^{\′}-(X_{\mathrm{di}}-X_{\mathrm{di}}^{\′})I_{\mathrm{di}}=0\end{array},i\∈S_G\right.$

Wherein:

E' _di: generator i direct-axis transient electromotive force;

E' _qi: generator i quadrature axis transient internal voltage;

δ _i: the corner of generator i;

I _di: the direct axis component of the stator current of generator i;

I _qi: the quadrature axis component of the stator current of generator i;

X' _di: the d-axis transient state reactance of generator i;

X' _qi: the quadrature axis transient state reactance of generator i;

R _si: the armature resistance of generator i;

E _fdi: the output voltage of generator i excitation system.

C) differential equation.

$\left\{\begin{array}{c}\frac{d{\mathrm{\δ}}_i}{\mathrm{dt}}={\mathrm{\ω}}_i-{\mathrm{\ω}}_s\\ \frac{d{\mathrm{\ω}}_i}{\mathrm{dt}}=\frac{T_{\mathrm{Mi}}}{M_i}-\frac{[E_{\mathrm{qi}}^{\′}-X_{\mathrm{di}}^{\′}{I}_{\mathrm{di}}]I_{\mathrm{qi}}}{M_i}-\frac{[E_{\mathrm{di}}^{\′}+X_{\mathrm{qi}}^{\′}{I}_{\mathrm{qi}}]I_{\mathrm{di}}}{M_i}-\frac{D_i({\mathrm{\ω}}_i-{\mathrm{\ω}}_s)}{M_i}\\ \frac{d{E}_{\mathrm{qi}}^{\′}}{\mathrm{dt}}=-\frac{E_{\mathrm{qi}}^{\′}}{T_{\mathrm{di}}^{\′}}-\frac{(X_{\mathrm{di}}-X_{\mathrm{di}}^{\′})I_{\mathrm{di}}}{T_{\mathrm{di}}^{\′}}+\frac{E_{\mathrm{fdi}}}{T_{\mathrm{di}}^{\′}}\\ \frac{d{E}_{\mathrm{qi}}^{\′}}{\mathrm{dt}}=-\frac{E_{\mathrm{di}}^{\′}}{T_{\mathrm{qi}}^{\′}}+\frac{(X_{\mathrm{qi}}-X_{\mathrm{qi}}^{\′})I_{\mathrm{qi}}}{T_{\mathrm{qi}}^{\′}}\\ \frac{d{E}_{\mathrm{fdi}}}{\mathrm{dt}}=-\frac{K_{\mathrm{Ei}}+S_E\left(E_{\mathrm{fdi}}\right)}{T_{\mathrm{Ei}}}{E}_{\mathrm{fdi}}+\frac{V_{\mathrm{Ri}}}{T_{\mathrm{Ei}}}\\ \frac{d{V}_{\mathrm{Ri}}}{\mathrm{dt}}=-\frac{V_{\mathrm{Ri}}}{T_{\mathrm{Ai}}}+\frac{K_{\mathrm{Ai}}}{T_{\mathrm{Ai}}}{R}_{\mathrm{Fi}}-\frac{K_{\mathrm{Ai}}{K}_{\mathrm{Fi}}}{T_{\mathrm{Ai}}{T}_{\mathrm{Fi}}}{E}_{\mathrm{fdi}}+\frac{K_{\mathrm{Ai}}}{T_{\mathrm{Ai}}}(V_{\mathrm{refi}}-V_i)\\ \frac{d{R}_{\mathrm{Fi}}}{\mathrm{dt}}=-\frac{R_{\mathrm{Fi}}}{T_{\mathrm{Fi}}}+\frac{K_{\mathrm{Fi}}}{{\left(T_{\mathrm{Fi}}\right)}^2}{E}_{\mathrm{fdi}}\end{array}\right.$

2. inequality constraints condition is network physical restriction and runs restriction (use capable of being combined), includes:

A) node voltage restriction, the value of restriction is to the type of voltage levvl, node, region or node is normal or contingency condition is relevant.

${\underset{\‾}{V}}_i\≤V_i\≤{\stackrel{\‾}{V}}_i,i\∈S_N$

Wherein:

the upper limit of the amplitude of the i-th node voltage;

the lower limit of the amplitude of the i: the i-th node voltage.

B) unit export-restriction, comprises meritorious exert oneself restriction, idle restriction of exerting oneself.

${\underset{\‾}{P}}_{\mathrm{Si}}\≤P_{\mathrm{Si}}\≤{\stackrel{\‾}{P}}_{\mathrm{Si}},i\∈S_{\mathrm{SG}}$

${\underset{\‾}{Q}}_{\mathrm{Ri}}\≤Q_{\mathrm{Ri}}\≤{\stackrel{\‾}{Q}}_{\mathrm{Ri}},i\∈S_R$

Wherein:

generator active power bound.

generator reactive power bound.

C) all characteristic value real parts of balance point state matrix are less than set-point:

{Re(λ)|λ∈λ(A)}≤ε (ε≤0)

D) damping ratio constraint: the damping ratio of the characteristic value of state matrix is all greater than certain numerical value (generally getting the numerical value of more than 0.03)

η >=ξ (ξ >=0.03), wherein η represents damping ratio

Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.

Embodiment: a kind of low-frequency oscillation analysis based on real time data and optimum Corrective control method, shown in figure 2, its step is as follows:

Step one, obtains real-time CIM file initial data form, e formatted file initial data form and unit parameter initial data form;

Step 2, adopt data-interface to resolve initial data form, CIM file initial data form, e formatted file initial data form and unit parameter initial data form are converted into the user-defined format data sheet needed for Load Flow Program, Low Frequency Oscillation Analysis program and optimum Corrective control program;

Step 3, utilizes Load Flow Program to carry out Load flow calculation to the real-time format data sheet after conversion;

Step 4, adopts Low Frequency Oscillation Analysis program to carry out static state stability calculation to system based on calculation of tidal current;

Step 5, checks static state stability calculation destination file, and whether judged result exists real part is greater than the characteristic value of zero or the value of damping ratio deficiency; If do not exist, then think that this system is statically stable; If exist, then easily there is low-frequency oscillation in system, starts the optimum Corrective control program of Low Frequency Oscillation Analysis;

Step 6, start the optimum Corrective control program of Low Frequency Oscillation Analysis, arrange being undertaken correcting by the control variables or constraints calculating electric power system: adopt the optimal load flow and characteristic value optimization method containing damping ratio constraint analyze electric power system and solve, obtain correction control data, wherein, control variables comprises generator active power, PV node voltage etc., and constraints comprises the upper and lower bound of the active power of generator and the upper and lower bound of reactive power and node voltage;

Step 7, checks the result of calculation file after correction, and export result of calculation form, this result can ensure that evaluated electric power system is in the mode of safely and steadily running, and this power system operating mode is the safe and stable operation limit of evaluated electric power system;

Now for somewhere electrical network 568 node system, real-time low-frequency oscillation operating analysis and optimum Corrective control are carried out to this system.Analytical procedure is as follows:

1, this system has 568 nodes, 489 circuits, 63 generators, 313 transformers;

2, real-time CIM file initial data form, e formatted file initial data form and unit parameter initial data form is obtained;

3, adopt data-interface to resolve initial data form, CIM file initial data form, e formatted file initial data form and unit parameter initial data form are converted into the user-defined format data sheet needed for Load Flow Program, Low Frequency Oscillation Analysis program and optimum Corrective control program;

4, Load Flow Program is utilized to carry out Load flow calculation to the real-time format data sheet after conversion;

5, Low Frequency Oscillation Analysis program is adopted to carry out static state stability calculation to system based on calculation of tidal current;

6, check static state stability calculation destination file, whether judged result exists real part is greater than the characteristic value of zero or the value of damping ratio deficiency; If do not exist, then think that this system is statically stable; If exist, then easily there is low-frequency oscillation in system, starts the optimum Corrective control program of Low Frequency Oscillation Analysis;

7, the optimum Corrective control program of Low Frequency Oscillation Analysis is started, arrange being undertaken correcting by the control variables or constraints calculating electric power system: adopt the optimal load flow and characteristic value optimization method containing damping ratio constraint analyze electric power system and solve, obtain correction control data, wherein, control variables comprises generator active power, PV node voltage etc., and constraints comprises the upper and lower bound of the active power of generator and the upper and lower bound of reactive power and node voltage;

8, check the result of calculation file after correction, cooperation control is carried out to the unit output of system, propose the collocation strategy that calculated power system steady stability runs.

In the operation of practical power systems, this method is to being calculated the stable operation analysis of electric power system and Corrective control effect clearly.Lift an example to be below described:

Using the static state stability calculation result of system as ground state, carry out Corrective control with the damping ratio constrained optimum trend of different numerical value, its result is as following table: wherein η represents damping ratio.

Sequence number	1	2	3	4
					Damping ratio retrains	Ground state	η≥0.042	η≥0.044	η≥0.046
Minimum damping ratio	0.04165170	0.04201111	0.04422099	0.04609023
					P G1	601.719	602.1612	576.8442	516.2662
P G2	663.064	662.5029	634.6277	551.9978
					P G3	53.9325	53.9325	53.9325	53.9325
P G4	488.689	488.3209	474.5019	452.3960
					P G5	491.162	491.2232	477.6311	464.5942
P G6	59.0119	59.9563	76.0690	76.4700
					P G7	59.8597	61.5207	54.8828	59.6928
P G8	276.2517	267.5292	198.3985	146.4452
					P G9	143.6	143.3400	115.2347	109.2728
P G10	137.4036	135.9359	134.1355	130.8074
					P G11	206.0002	209.5390	225.2033	243.2707
P G12	137.4036	139.3678	171.7857	210.0001
					P G13	74.0148	74.9380	130.3000	130.3000
P G14	71.4248	70.7207	85.7741	130.3000
					P G15	636.774	657.2837	667.0000	667.0000
P G16	633.343	614.6777	425.4178	321.8792
					P G17	605.852	600.7695	585.0646	591.6176
P G18	598.646	595.2671	577.2408	583.2024
					P G19	252.175	256.4784	297.0540	333.4123
P G20	256.526	256.4067	289.7756	336.8446
					P G21	81.1407	81.2795	87.4786	88.5387
P G22	319.825	320.8706	328.9543	340.2272
					P G23	355.169	357.2485	398.7204	422.5860

P G24	277.831	277.9717	273.9139	245.2894
					P G25	274.88	275.0514	277.9240	277.9083
P G26	203.791	206.6434	235.0000	235.0000
					P G27	159.262	161.3318	187.8086	198.2184
P G28	120.408	118.4469	94.4343	91.4639
					P G29	85.3499	84.8570	70.5627	65.9353
P G30	252.104	248.3396	262.7101	284.4454
					P G31	263.721	268.1907	309.5787	353.141
P G32	637.395	641.3828	709.5728	744.00
					P G33	100.021	99.0672	120.0154	139.1296
P G34	29.2494	28.9245	44.7000	44.7000
					P G35	9.8574	9.9362	5.4071	0.2939
P G36	119.041	119.1388	118.4691	135.0548
					P G37	129.625	131.0796	154.1303	158.80
P G38	129.659	128.1881	109.5159	100.5506
					P G39	254.991	256.9994	260.6055	257.3609
P G40	256.477	259.3306	288.7616	323.9847
					P G41	630.681	621.7782	532.8348	480.3806
P G42	579.095	568.0007	486.8934	455.2222
					P G43	148.308	146.1131	151.4585	155.8615
P G44	233.096	235.6788	275.7366	312.8406
					P G45	31.2908	35.4583	59.3691	83.9922
P G46	983.917	986.5852	1028.9622	1016.7915
					P G47	81.3681	81.3678	77.0366	79.3562
P G48	40.1094	40.1573	40.1572	40.1571
					P G49	82.5724	82.5663	82.5724	82.5724
P G50	27.8106	28.1422	43.2837	45.6
					P G51	19.0347	22.5372	40.0997	45.6
P G52	24.3893	24.8949	11.3887	0.0001

P G53	30.1646	32.6000	32.6000	32.6000
					P G54	29.7373	26.6814	0	0
P G55	16.734	18.8451	24.5000	24.50
					P G56	18.0163	14.1664	2.8436	6.5597
P G57	29.5122	29.0492	24.2081	24.2236
					P G58	46.7769	46.7769	46.7769	46.7769
P G59	24.9042	24.3922	17.1532	1.0022
					P G60	19.3787	19.7717	21.7400	21.7400
P G61	9.4195	8.4041	12.7200	20.2718
					P G62	0	0	0	0
P G63	14.2714	16.5109	15.5611	22.8659

Illustrated by above-mentioned example: the damping ratio of the characteristic value of the meritorious static state stability calculation that can control calculated electric power system of exerting oneself of Reasonable adjustment generating set, all more than certain numerical value, makes power system steady-state stability low-frequency oscillation can not occur.By the optimization to entire system, calculated electric power system can remain steady stability operational mode, makes the reliable and stable operation of electrical network.

Describe embodiments of the present invention by reference to the accompanying drawings above, but do not limit by above-mentioned case study on implementation when realizing, those of ordinary skill in the art can make a variety of changes within the scope of the appended claims or revise.

Claims (6)

1. the real-time Low Frequency Oscillation Analysis of electric power system and an optimum corrective control, is characterized in that, comprises data acquisition module, data resolution module, calculating Executive Module, optimum Corrective control module and system management module; Data acquisition module, obtains real-time CIM file initial data form, e formatted file initial data form and forms unit supplemental characteristic form; Data resolution module, utilizes self-defining data interface that CIM file initial data form and e formatted file initial data form are converted to the formatted data form needed for calculation procedure; Calculate Executive Module, adopt flow calculation program and Low Frequency Oscillation Analysis program to calculate user-defined format data sheet; Optimum Corrective control module, adopts and is optimized containing the optimal load flow of damping ratio constraint and the low-frequency oscillation Corrective control program of characteristic value optimization initial data form, corrects; System management module, completes the setting of relevant parameter.

2. the control method adapted with control system according to claim 1, is characterized in that, comprise the following steps:

Step one, obtains real-time CIM file initial data form, e formatted file initial data form and unit parameter initial data form;

Step 2, adopt data-interface to resolve initial data form, CIM file initial data form, e formatted file initial data form and unit parameter initial data form are converted into the user-defined format data sheet needed for Load Flow Program, Low Frequency Oscillation Analysis program and optimum Corrective control program;

Step 3, utilizes Load Flow Program to carry out Load flow calculation to the real-time format data sheet after conversion;

Step 4, adopts Low Frequency Oscillation Analysis program to carry out static state stability calculation to system based on calculation of tidal current;

Step 5, checks static state stability calculation destination file, and whether judged result exists real part is greater than the characteristic value of zero or the value of damping ratio deficiency; If do not exist, then think that this system is statically stable; If exist, then easily there is low-frequency oscillation in system, starts the optimum Corrective control program of Low Frequency Oscillation Analysis;

Step 6, start the optimum Corrective control program of Low Frequency Oscillation Analysis, carried out corrections arrange calculating the control variables of electric power system or constraints, adopt and electric power system is analyzed and solves containing the optimal load flow of damping ratio constraint and characteristic value optimization method, acquisition correction control data; Wherein, control variables comprises generator active power and PV node voltage, and constraints comprises the upper and lower bound of the active power of generator and the upper and lower bound of reactive power and node voltage;

Step 7, checks the result of calculation file after correction, and export result of calculation form, this result can ensure that evaluated electric power system is in the mode of safely and steadily running, and this power system operating mode is the safe and stable operation limit of evaluated electric power system.

3. control method according to claim 2, is characterized in that, in step one, the data obtained are the real-time running data of electrical network.

4. control method according to claim 2, it is characterized in that, in step 2, while node parses is carried out to the network configuration and service data that include evaluated electric power system, also the network configuration and service data that include evaluated electric power system are carried out to the process of node equivalence.

5. control method according to claim 2, is characterized in that, in step 6, described constraints also comprises system load flow constraint, for ensureing that evaluated electric power system meets system load flow constraint all the time.

6. control method according to claim 2, it is characterized in that, in step 7, the result of calculation form of output after optimum has corrected, the meritorious regulating power including the characteristic value result of calculation after optimization and generator in form regulates for operations staff's reference.