CN108539761B - PSS parameter full-band optimization setting method - Google Patents

PSS parameter full-band optimization setting method Download PDF

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CN108539761B
CN108539761B CN201810368028.9A CN201810368028A CN108539761B CN 108539761 B CN108539761 B CN 108539761B CN 201810368028 A CN201810368028 A CN 201810368028A CN 108539761 B CN108539761 B CN 108539761B
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phase
pss
link
frequency
frequency characteristic
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CN108539761A (en
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肖友强
司大军
李玲芳
陈义宣
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Yunnan Power Grid Co Ltd
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Yunnan Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

Abstract

The application discloses a PSS parameter full-band optimization setting method, which comprises the steps of obtaining the actual phase-frequency characteristic of a test unit; respectively calculating the phase-frequency characteristics of a PSS measuring link, the phase-frequency characteristics of an isolation link and the phase-frequency characteristics of a comparison link; obtaining the time constant optimal value of the PSS compensation link by using a preset algorithm by utilizing an optimization model according to the actual phase-frequency characteristic of the unit, the phase-frequency characteristic of the PSS measurement link, the phase-frequency characteristic of the PSS isolation link and the phase-frequency characteristic of the PSS comparison link; and determining the optimal value of the time constant as the optimal setting value of the PSS parameter. The phase compensation of the set PSS parameter is optimal in the full frequency band of 0.2-2.5 Hz, the change of the oscillation mode frequency caused by the grid frame change is adapted, the PSS provides the most effective additional damping, and the power transmission capacity is improved to the maximum extent.

Description

PSS parameter full-band optimization setting method
Technical Field
The application relates to the field of power systems, in particular to a PSS parameter full-band optimization setting method.
Background
Along with the operation of a large number of units and the interconnection of power grids, the dynamic damping of long-distance large-capacity power transmission is reduced, and the low-frequency oscillation of a regional power grid is caused in severe cases, so that the safe and stable operation of the power grid is threatened. At present, a PSS (Power System Stabilizer) is mainly used to improve dynamic damping or suppress low-frequency oscillation, and is an additional component of an excitation System, and the PSS extracts a signal related to oscillation to generate an additional signal, so that a generator generates an additional damping torque, thereby improving the dynamic damping of the System and the transmission capacity of each section and suppressing the occurrence of low-frequency oscillation.
If the PSS parameters are not reasonably set, the PSS cannot effectively provide additional damping to suppress low frequency oscillation, and even possibly has an auxiliary effect on the oscillation. Currently, PSS parameter setting is generally completed by a power test unit, and the method is diversified. Such as: and inputting the phase-frequency characteristic test data of the unit into a Matlab program after the phase-frequency characteristic test data needs to be processed, and obtaining the PSS compensation link time constant by adopting a genetic evolution algorithm. The PSS parameter setting is inaccurate and unreasonable after the data are artificially processed, and the dynamic damping provided by the set to the system is insufficient. For example, after a PSS parameter setting test of a #1 machine of an A power station, when stable check is carried out by using a BPA program, the fact that the positive damping of the set on a power grid region oscillation mode is insufficient is found, and then the #1 machine parameter setting is modified during the PSS parameter setting test of the #2 machine.
Disclosure of Invention
The application provides a PSS parameter full-band optimization setting method, which aims to solve the problem of insufficient dynamic damping provided by a set to a system due to unreasonable PSS parameter setting.
The application provides a PSS parameter full-band optimization setting method, which comprises the following steps:
acquiring actual phase-frequency characteristics of the test unit;
respectively calculating the phase-frequency characteristics of a PSS measuring link, the phase-frequency characteristics of an isolation link and the phase-frequency characteristics of a comparison link;
obtaining the time constant optimal value of the PSS compensation link by using a preset algorithm by utilizing an optimization model according to the actual phase-frequency characteristic of the unit, the phase-frequency characteristic of the PSS measurement link, the phase-frequency characteristic of the PSS isolation link and the phase-frequency characteristic of the PSS comparison link;
and determining the optimal value of the time constant as the optimal setting value of the PSS parameter.
Further, the optimization model is
Figure BDA0001637819890000021
Figure BDA0001637819890000022
Figure BDA0001637819890000023
Wherein: min F (T)1,T2,T3,T4,T5,T6) To optimize the objective function; s.t. is a constraint condition; t is1～T6Is the time constant of the PSS compensation link; t ismin,TmaxAre specified minimum and maximum values
Figure BDA0001637819890000024
Measuring phase angles of a link, an isolation link and a comparison link at the frequency fi for the PSS;
Figure BDA0001637819890000025
testing a phase angle of the phase-frequency characteristic at the position fi for the unit;
Figure BDA0001637819890000026
is the error angle of the measurement instrument at frequency fi; and N is the group number of the phase-frequency characteristic data of the unit.
Further, the preset algorithm is a constraint variable-scale optimization method.
The PSS parameter full-band optimization setting method has the advantages that the phase compensation of the set PSS parameter is optimal in the 0.2-2.5 Hz full band, the change of the oscillation mode frequency caused by the grid frame change is adapted, the PSS provides the most effective additional damping, and the power transmission capacity is improved to the maximum extent.
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In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic flow diagram of a PSS parameter full-band optimization setting method provided in the present application;
fig. 2 is the PSS2A model.
Detailed Description
Referring to fig. 1, the present application provides a PSS parameter full-band optimization setting method, including:
step 10: and acquiring the actual phase-frequency characteristic of the testing unit.
The actual phase-frequency characteristic is a test phase-frequency characteristic directly obtained by a measuring instrument during a test, and the corrected phase-frequency characteristic of the unit, namely the actual phase-frequency characteristic of the unit, is obtained by considering the measurement error of the measuring instrument. For example, the following table shows the experimental phase frequency characteristics of the a plant #1 unit.
Figure BDA0001637819890000027
Figure BDA0001637819890000031
Figure BDA0001637819890000041
The following table shows the measurement instrument strategy error of the 1# unit
Figure BDA0001637819890000042
Figure BDA0001637819890000051
"-" indicates hysteresis. For example: the frequency of 2.01416Hz produces a lag angle of 142.7891077 degrees in the electromagnetic circuit of the exciter system generator. During testing, Excel files directly generated by a measuring instrument acquire the phase frequency characteristics of the test.
Step 11: and respectively calculating the phase-frequency characteristics of the PSS measuring link, the phase-frequency characteristics of the isolation link and the phase-frequency characteristics of the comparison link.
Referring to fig. 2, the phase-frequency characteristics of the PSS measurement link, the phase-frequency characteristics of the isolation link, and the phase-frequency characteristics of the comparison link are calculated according to the PSS transfer function, and the PSS2A model is taken as an example below.
PSS2A employs a dual input signal, where ω - ω0For the deviation of the terminal angular frequency, Pe-P0 isThe deviation of the electromagnetic power, T1-T6, is the time constant of the compensation element, S is the traditional laplace transform factor (S ═ j ω) in the mathematical domain, and Kpss is the gain.
(1) Phase-frequency characteristic of PSS measuring link
The measurement procedure of the PSS comprises
Figure BDA0001637819890000052
And
Figure BDA0001637819890000053
link, time constant TrWAnd TrPAre all very small. General tuning TrW＝TrP0.02 second, Kr＝1。
And calculating a phase angle of the measurement link within a frequency band of 0.2-2.5 Hz to obtain the phase-frequency characteristic of the PSS measurement link.
(2) Phase-frequency characteristics of PSS isolation link
The isolation link comprises
Figure BDA0001637819890000054
And
Figure BDA0001637819890000055
and (5) linking. By using the angular frequency signal and the electromagnetic power signal, the time constant of the isolation link in the PSS transfer function is generally defined as: t is1W4 seconds, T2W4 seconds, TP4 seconds.
And calculating a phase angle corresponding to the isolation link within a frequency band of 0.2-2.5 Hz to obtain the phase-frequency characteristic of the PSS isolation link.
(3) Phase-frequency characteristics of PSS comparison link
KS、T7K constitutes a comparison link, and the parameters of the comparison link are generally set as follows: t is74 seconds, KS＝T7/TJ(TJA unit inertia time constant), K is 1.
And calculating a phase angle corresponding to the comparison link within a frequency band of 0.2-2.5 Hz to obtain the phase-frequency characteristic of the PSS comparison link.
(4) Phase-frequency characteristic of PSS filtering link
Parameter T8、T9And M, N, setting to meet the condition that the angle generated by the link is about-360 degrees, and the setting can be as follows: t is80.1 second, 5M, 1N, T90.012 seconds.
The filtering link is used for high-frequency filtering, and the phase-frequency characteristic of the link is not considered.
(5) Parameter setting of PSS compensation link
The compensation step comprises
Figure BDA0001637819890000061
And
Figure BDA0001637819890000062
and (5) linking. The phase angle generated by the link is as follows:
Figure BDA0001637819890000063
wherein T1-T6 is the optimization setting method of the invention.
(6) PSS (Power System stabilizer) amplitude limiting link
In order to avoid the adverse effect of the PSS during large disturbance, an amplitude limiting link is added at the PSS outlet, and the amplitude limiting value is as follows: and +/-0.05-0.1) pu.
Step 12: and obtaining the time constant optimal value of the PSS compensation link by using a preset algorithm by utilizing an optimization model according to the actual phase-frequency characteristic of the unit, the phase-frequency characteristic of the PSS measurement link, the phase-frequency characteristic of the PSS isolation link and the phase-frequency characteristic of the PSS comparison link.
The optimization model is
Figure BDA0001637819890000064
Figure BDA0001637819890000065
Figure BDA0001637819890000066
Wherein: min F (T)1,T2,T3,T4,T5,T6) To optimize the objective function; s.t. is a constraint condition; t is1～T6Is the time constant of the PSS compensation link; t ismin,TmaxAre specified minimum and maximum values
Figure BDA0001637819890000067
Measuring phase angles of a link, an isolation link and a comparison link at the frequency fi for the PSS;
Figure BDA0001637819890000068
testing a phase angle of the phase-frequency characteristic at the position fi for the unit;
Figure BDA0001637819890000069
is the error angle of the measuring instrument at the frequency fi; and N is the group number of the phase-frequency characteristic data of the unit.
Further, the preset algorithm is a constraint variable-scale optimization method. The constrained variable-scale optimization algorithm is one of the most effective algorithms for solving the constrained optimization problem.
For example, by using the data of the 1# machine of the a power station, the calculation results of the optimal values T1-T6 of the time constant of the 1# machine PSS compensation link are as follows: t1-0.2631 seconds, T2-0.0175 seconds, T3-0.2631 seconds, T4-0.0175 seconds, T5-0.7360 seconds, T6-2.0000 seconds.
Step 13: and determining the optimal value of the time constant as the optimal setting value of the PSS parameter.
The PSS parameter full-band optimization setting method has the advantages that the phase compensation of the set PSS parameter is optimal in the 0.2-2.5 Hz full band, the change of the oscillation mode frequency caused by the grid frame change is adapted, the PSS provides the most effective additional damping, and the power transmission capacity is improved to the maximum extent.

Claims (2)

1. A PSS parameter full-band optimization setting method is characterized by comprising the following steps:
acquiring actual phase-frequency characteristics of the test unit;
respectively calculating the phase-frequency characteristics of a PSS measuring link, the phase-frequency characteristics of an isolation link and the phase-frequency characteristics of a comparison link;
obtaining the time constant optimal value of the PSS compensation link by using a preset algorithm by utilizing an optimization model according to the actual phase-frequency characteristic of the unit, the phase-frequency characteristic of the PSS measurement link, the phase-frequency characteristic of the PSS isolation link and the phase-frequency characteristic of the PSS comparison link;
determining the optimal value of the time constant as the optimal setting value of the PSS parameter; the optimization model is as follows:
Figure FDA0002999308400000011
Figure FDA0002999308400000012
Figure FDA0002999308400000013
wherein: min F (T)1,T2,T3,T4,T5,T6) To optimize the objective function; s.t. is a constraint condition; t is1～T6Is the time constant of the PSS compensation link; t ismin,TmaxSpecified minimum and maximum values;
Figure FDA0002999308400000014
measuring phase angles of a link, an isolation link and a comparison link at the frequency fi for the PSS;
Figure FDA0002999308400000015
testing a phase angle of the phase-frequency characteristic at the position fi for the unit;
Figure FDA0002999308400000016
is the error angle of the measurement instrument at frequency fi; n isAnd (4) the number of groups of the unit phase frequency characteristic data.
2. The method of claim 1, wherein the predetermined algorithm is a constrained variable-scale optimization method.
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