CN110417013B - Power system stabilizer parameter setting method and readable storage medium - Google Patents
Power system stabilizer parameter setting method and readable storage medium Download PDFInfo
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Abstract
The invention discloses a parameter setting method of a power system stabilizer and a readable storage medium, wherein the method comprises the following steps: calculating a transfer function of the PSS according to the PSS transfer block diagram of the power system stabilizer; establishing a generator simulation model based on MATLAB, and simulating and calculating the oscillation quantity of the generator electromagnetic power corresponding to the voltage disturbance of the generator terminal; constructing an objective function based on the transfer function and the oscillation amount of the generator electromagnetic power; setting constraint conditions, and solving the objective function by adopting a genetic algorithm to obtain PSS optimal time and gain parameters; and setting the generator PSS according to the PSS optimal time and the gain parameter. According to the method, the influence of the phase and the amplitude on the overall optimal performance of the PSS is calculated in the optimization model, the genetic algorithm is adopted to solve the model, and the full-band damping effect of the PSS can be effectively improved.
Description
Technical Field
The invention relates to the technical field of power calculation, in particular to a power system stabilizer parameter setting method and a readable storage medium.
Background
The contradiction of reverse distribution of the load center and the energy center in China determines that the long-distance transmission of large-scale energy can be realized only by building a large-scale alternating current-direct current interconnected power grid. With the continuous expansion of the interconnection scale of the ultrahigh voltage alternating current and direct current power grid in China, the long-distance large-capacity power grid structure inevitably leads to insufficient damping of an interconnection system, increases the risk of low-frequency oscillation of the system and influences the safe and stable operation of the power grid.
The Power System Stabilizer (PSS) is used as an additional excitation control, and has obvious effects of improving the low-frequency oscillation suppression capability of a power grid and improving the stability of a power system. So far, the most economical and mature measures for improving the system damping level and inhibiting low-frequency oscillation are still widely applied, and the current PSS parameter setting only emphasizes phase compensation and cannot well meet the requirements.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a method for setting parameters of a power system stabilizer and a readable storage medium, so as to improve the damping effect of the full PSS band.
One of the objectives of the present invention is achieved by the technical solution, which is a method for setting parameters of a power system stabilizer, the method comprising the steps of:
calculating a transfer function of the PSS according to the PSS transfer block diagram of the power system stabilizer;
establishing a generator simulation model based on MATLAB, and simulating and calculating the oscillation quantity of the generator electromagnetic power corresponding to the voltage disturbance of the generator terminal;
constructing an objective function based on the transfer function and the oscillation amount of the generator electromagnetic power;
setting constraint conditions, and solving the objective function by adopting a genetic algorithm to obtain PSS optimal time and gain parameters;
and setting the generator PSS according to the PSS optimal time and the gain parameter.
Optionally, after calculating the transfer function of the PSS according to the transfer diagram of the power system stabilizer PSS, the method further includes:
and simplifying the transfer function according to the setting parameter of the PSS to obtain a simplified transfer function.
Optionally, the objective function satisfies:
wherein α and β are weighting coefficients, α + β is 1, and Gpss() Representing the transfer function, f representing the frequency,
indicating that the exciter system is not compensating for the lagging phase,
indicating the compensation phase, t, of the excitation system PSSsIndicating the length of the simulation time, PeRepresenting generator electromagnetic power, P, after disturbance of generator terminal voltagee0Representing the electromagnetic power of the generator at steady state of the generator and t representing the integration time.
Optionally, the constraint condition satisfies:
in the formula, KslAnd K is the actually measured PSS critical gain.
Optionally, after a generator simulation model is established based on MATLAB, and an oscillation quantity of the generator electromagnetic power corresponding to the generator terminal voltage disturbance is simulated and calculated, the method further includes: and (4) actually measuring to obtain an uncompensated lagging phase of an excitation system of the generator.
In a second aspect, a second embodiment of the present invention provides a computer-readable storage medium, on which an implementation program for information transfer is stored, and the program, when executed by a processor, implements the steps of the method of the first embodiment.
Due to the adoption of the technical scheme, the invention has the following advantages: according to the method, the influence of the phase and the amplitude on the overall optimal performance of the PSS is calculated in the optimization model, the genetic algorithm is adopted to solve the model, and the damping effect of the full frequency band of the PSS can be effectively improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The drawings of the invention are illustrated as follows:
FIG. 1 is a flow chart of a first embodiment of the present invention;
FIG. 2 is a block diagram illustrating a transfer function according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram showing the comparison between the PSS parameter damping effect of the first embodiment of the method of the present invention and the conventional method.
Detailed Description
The invention is further illustrated by the following figures and examples.
In an embodiment, a first embodiment of the present invention provides a method for setting a time and a gain parameter of a power system stabilizer, as shown in fig. 1, the method includes the following steps:
step S1: calculating a transfer function of the PSS according to the PSS transfer block diagram of the power system stabilizer;
step S2: establishing a generator simulation model based on MATLAB, and simulating and calculating the oscillation quantity of the generator electromagnetic power corresponding to the voltage disturbance of the generator terminal;
step S3: constructing an objective function based on the transfer function and the oscillation amount of the generator electromagnetic power;
step S4: setting constraint conditions, and solving the objective function by adopting a genetic algorithm to obtain PSS optimal time and gain parameters;
step S5: and setting the generator PSS according to the PSS optimal time and the gain parameter.
According to the method, the influence of the phase and the amplitude on the overall optimal performance of the PSS is calculated in the optimization model, the genetic algorithm is adopted to solve the model, and the full-band damping effect of the PSS can be effectively improved.
Specifically, referring to fig. 2, in one embodiment of the present invention, step S1: calculating a transfer function of the PSS according to the transfer block diagram of the power system stabilizer PSS, which may be:
Gpss(s)＝{G1(s)·G2(s)·Δw(s)·G5(s)+[Ks3·G5(s)-1]·G3(s)·G4(s)·Δp(s)}·Ks3·G6(s)·G7(s)·G8(s)
wherein:
s＝j2πf。
optionally, after calculating the transfer function of the PSS according to the transfer diagram of the power system stabilizer PSS, the method further includes:
and simplifying the transfer function according to the setting parameter of the PSS to obtain a simplified transfer function.
According to the design principle of the PSS 2 type power system stabilizer and the parameter setting requirement in engineering, the transfer function comprises the following implicit conditions: t isw1＝Tw2＝Tw3＝T7、Ks3＝1、
(TjIs the generator inertia time constant, is a known value), and parameter M, N, T8、T9The values are generally as follows: n-1, M-5, T8＝0.6、T9＝0.12、K s31. Thus, the above transfer function can be simplified as follows:
from the simplified function, Gpss(s) is with respect to Ks1Gain parameter, T1～T7A function of a time parameter.
Step S2: establishing a generator simulation model based on MATLAB, and simulating and calculating the oscillation quantity of the generator electromagnetic power corresponding to the voltage disturbance of the generator terminal;
in this embodiment, step S2 includes establishing a generator single-machine infinite system simulation model in MATLAB, and performing simulation to calculate the oscillation amount of the generator electromagnetic power corresponding to the 5% disturbance of the generator terminal voltage.
Optionally, after a generator simulation model is established based on MATLAB, and an oscillation quantity of the generator electromagnetic power corresponding to the generator terminal voltage disturbance is simulated and calculated, the method further includes: and (4) actually measuring to obtain an uncompensated lagging phase of an excitation system of the generator.
Specifically, in yet another alternative embodiment of the present invention, the field measurement results in an uncompensated lag phase of the generator's excitation system
In this embodiment, the uncompensated lag phase of the excitation system of the generator is measured
The following were used:
step S3: constructing an objective function based on the transfer function and the oscillation amount of the generator electromagnetic power;
specifically, according to an objective function for constructing an optimized mathematical model based on MATLAB GUI, the following conditions are satisfied:
in the present embodiment, J represents an objective function, Gpss(j2 π f) is the PSS transfer function,
and
respectively providing an uncompensated lagging phase and a PSS compensation phase of an excitation system corresponding to the frequency f; pe0And PeThe electromagnetic power of the generator is respectively in a steady state of the generator and after 5% disturbance of the voltage at the generator end, and the unit is as follows: MW; t is tsFor simulation time length, unit: and second.
The objective function of the embodiment of the invention is obtained by weighting and summing two parts, the weighting coefficients are respectively alpha and beta, and alpha + beta is 1. Wherein, the left part of the plus sign is the reciprocal of the damping component of the electromagnetic torque generated by the PSS through the excitation regulator, and the magnitude of the reciprocal is related to both the time and the gain parameter of the PSS; the right part of the plus sign shows the oscillation quantity of the electromagnetic power of the generator corresponding to 5% disturbance of the voltage of the generator terminal under the rated working condition, and the oscillation quantity can be obtained by the establishment of a unit single machine-infinite system simulation model through calculation, and the size of the oscillation quantity is also related to the time and gain parameters of the PSS. Therefore, the objective function proposed by the method is a function of the PSS time and the gain parameter, on one hand, the damping component of the electromagnetic torque generated by the PSS through the excitation regulator is ensured to be as large as possible, and on the other hand, the power oscillation of the generator is ensured to be as small as possible under the condition of small disturbance.
Step S4: setting constraint conditions, and solving the objective function by adopting a genetic algorithm to obtain PSS optimal time and gain parameters;
specifically, the constraint conditions satisfy:
in the formula, KslAnd K is the actually measured PSS critical gain.
Based on the constraint conditions, the optimization model is solved by adopting a genetic algorithm, so that the optimal time and the gain parameters of the PSS can be obtained simultaneously, and the PSS has the optimal performance.
Step S5: and setting the generator PSS according to the PSS optimal time and the gain parameter.
Finally, the automatic flow of the method can be programmed and realized on a software interface built based on MATLAB GUI.
In this embodiment, based on the parameters obtained by the method of the present invention and the conventional method, the generator terminal voltage 2% disturbance step simulation is performed, and the damping effect of the PSS parameter obtained by the two methods is compared, as shown in fig. 3, it can be seen from fig. 3 that the damping effect of the PSS parameter obtained by the method of the present invention is significantly higher than that obtained by the conventional method, and positive technical effects are obtained.
To sum up, the first embodiment of the present invention provides a method for jointly optimizing and setting time and gain parameters of a power system stabilizer, which can significantly improve the capability of the power system stabilizer in suppressing low-frequency oscillation. The method comprehensively considers the coordination influence of time and gain parameters on the PSS moment phase and amplitude, simultaneously takes the influence of the phase and the amplitude on the PSS overall optimal performance into consideration in an optimization model, and solves the model by adopting a genetic algorithm, so that the full-band damping effect of the PSS can be effectively improved.
In a second aspect, a second embodiment of the present invention provides a computer-readable storage medium, on which an implementation program for information transfer is stored, and the program, when executed by a processor, implements the steps of the method of the first embodiment.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (3)
1. A method for setting parameters of a power system stabilizer is characterized by comprising the following steps:
calculating a transfer function of the PSS according to the PSS transfer block diagram of the power system stabilizer;
establishing a generator simulation model based on MATLAB, and simulating and calculating the oscillation quantity of the generator electromagnetic power corresponding to the voltage disturbance of the generator terminal;
constructing an objective function based on the transfer function and the oscillation amount of the generator electromagnetic power;
setting constraint conditions, and solving the objective function by adopting a genetic algorithm to obtain PSS optimal time and gain parameters;
setting the generator PSS according to the PSS optimal time and the gain parameter;
the transfer function satisfies:
Gpss(s)＝{G1(s)·G2(s)·Δw(s)·G5(s)+[Ks3·G5(s)-1]·G3(s)·G4(s)·Δp(s)}·Ks3·G6(s)·G7(s)·G8(s)
wherein:
s＝j2πf；Tw1、Tw2、Tw3、T1～T7time constants of each link of the PSS are obtained; ks2、Ks3Is a coefficient; ks1Is the gain of the PSS;
after calculating the transfer function of the PSS according to the power system stabilizer PSS transfer diagram, the method further comprises:
simplifying the transfer function according to the setting parameter of the PSS to obtain a simplified transfer function;
the above transfer function includes the following conditions: t isw1＝Tw2＝Tw3＝T7、Ks3＝1、
TjAs the inertia time constant of the generator, N is 1, M is 5, T8＝0.6、T9The transfer function can be simplified as follows, 0.12:
it is known that Gpss(s) is with respect to Ks1Gain parameter, T1～T7A function of a time parameter;
the objective function satisfies:
wherein J represents an objective function, α and β are weighting coefficients, α + β is 1, and Gpss() Representing the transfer function, f representing the frequency,
the uncompensated lagging phase of the excitation system is shown and can be obtained through field actual measurement;
the compensation phase of the excitation system PSS is represented and can be obtained through a PSS transfer function; t is tsIndicating the length of the simulation time, PeRepresenting generator electromagnetic power, P, after disturbance of generator terminal voltagee0Hair with indicationThe electromagnetic power of the generator when the motor is in a steady state;
the constraint condition satisfies:
in the formula, KslAnd K is the actually measured PSS critical gain.
2. The method of claim 1, wherein after building a generator simulation model based on MATLAB to simulate an amount of oscillation of generator electromagnetic power corresponding to a generator terminal voltage disturbance, the method further comprises: and (4) actually measuring to obtain an uncompensated lagging phase of an excitation system of the generator.
3. A computer-readable storage medium, characterized in that it has stored thereon a program for implementing the transfer of information, which program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 2.
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