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Method for regulating frequency domain based nonlinear power system stabilizer parameter

A power system stability and power system technology, applied in the direction of measuring electrical variables, general control systems, motor generator testing, etc., can solve the problems of NR-PSS unfavorable on-site operator parameter adjustment and use

Active Publication Date: 2008-02-06
TSINGHUA UNIV
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Problems solved by technology

The design of NR-PSS is based on nonlinear robust control theory, involving many disciplines such as differential geometry, differential game and H∞ control. The law makes NR-PSS not conducive to the parameter adjustment and use of on-site operators, which limits its popularization and application to a certain extent.

Method used

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  • Method for regulating frequency domain based nonlinear power system stabilizer parameter
  • Method for regulating frequency domain based nonlinear power system stabilizer parameter
  • Method for regulating frequency domain based nonlinear power system stabilizer parameter

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Embodiment Construction

[0042] The nonlinear model of NR-PSS is based on the multi-machine excitation system. The model considers the transient saliency effect and the influence of various uncertain factors in the system; on this basis, the differential geometric control theory and the linear The H∞ method is organically combined, that is, the nonlinear system is accurately linearized by the feedback linearization method, and then the linear H∞ method is applied. ∞ Control theory designs its robust control law, and finally returns to the designed nonlinear pre-feedback law to obtain the NR-PSS control law of the original system. Considering the cooperation with the automatic voltage regulator AVR, the final control law is as follows: ):

[0043] V NR - PSS = { E q - T d 0 ...

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Abstract

The present invention discloses parameter regulating method of non-linear electricity system stabilizer based on frequency domain test and pertains to the technical field of stability control of electric power system. The present invention is characterized in that: test the non-frequency-compensation linear property curves and test the phase angle under different frequency points in the low frequency vibrating range of 0.2 to 2.0Hz from the output point of the stabilizer to the voltage of the generator after the working condition of tested machine unit is fixed; then calculate the lead and lag angle a 1 of the linear part of the output signals of the stabilizer under different frequencies, added with phase angle that has corresponding frequency property, and then decide whether surpass the lead and lag range relative with Delta Omega axle prescribed by national standard; if not surpass, the feedback factor k1, k2 and k3 of the linear part can be calculated out; then the damping coefficient C1 and the gain coefficient C2 can be decided with critical amplification times method and load phase step method. The present invention is easy to be comprehended by commissioning operators and is easy to be populated.

Description

technical field [0001] The technical invention belongs to the technical field of power system stability and control. Background technique [0002] The excitation control of large generator sets is one of the most effective and economical technical means to improve the dynamic quality and transient stability of the power system. Current generator excitation regulators mainly use PID (Proportional Integral Differential Control), PSS (Power System Stabilizer) and LOEC (Linear Optimal Excitation Control), all of which are based on the approximate linearization model near the system operating equilibrium point. , thus ignoring the inherent nonlinear characteristics of the system. Although the NOEC (Nonlinear Optimal Excitation Control) designed based on the nonlinear mathematical model of the power system can effectively improve the stability of the power system, it is the same as the above three control methods. The mathematical model does not consider the uncertainty of the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/14G05B13/04G01R23/00G01R31/34
Inventor 卢强王钢郑少明邵广惠梅生伟
Owner TSINGHUA UNIV
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