Method for implementing parallel power system stabilizer

Abstract

The invention provides a method for implementing a parallel power system stabilizer (PSS). The parallel PSS of the invention divides compensation frequency domain of the existing PSS into two sections and compensates the compensation frequency domain by two compensation branches respectively, wherein, in one compensation branch, a gain regulating link is used for improving the amplitude of a high-frequency section, while in the other compensation branch, a lag compensation parameter is used for solving the shortage of compensation in a low-frequency section. As the same as the existing PSS, the parallel PSS of the invention can improve the stability of the small perturbation of the system and inhibit the low-frequency oscillation in an interconnected system. Compared with the existing PSS, the parallel PSS of the invention improves the phase-frequency characteristic of the low-frequency section and the amplitude-frequency characteristic of the high-frequency section, thereby widening the working frequency domain of the parallel PSS of the invention, and inhibiting the reactive power fluctuation while the system is in normal operation.

Description

technical field [0001] The invention relates to a realization method of a parallel power system stabilizer, which belongs to the field of power system stability control. Background technique [0002] The parallel power system stabilizer is an additional control of the excitation system of the synchronous generator. Its output signal is superimposed on the reference voltage of the generator excitation regulator. It provides positive feedback for different oscillation modes by adjusting the terminal voltage of the generator. The function of damping, its working principle is shown in the attached figure 2 . At present, a large number of self-shunt excitation static thyristor excitation methods are used in synchronous generators, which greatly reduces the time constant of the automatic excitation regulator (AVR). While improving the transient stability of the system, the fast excitation system reduces the damping of the power system under certain operating conditions, so that ...

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Problems solved by technology

[0024] The purpose of the present invention is to solve the following technical problems on the basis of retaining the signal generation part of the existing PSS and taking the acceleration power of the generator as the signal: (1) in some ways, the compensation degree of the PSS in the low frequency band is not enough, so that the ultra-large-scale When low-frequency oscillation occurs in the synchronous power grid, the problem that PSS cannot provide sufficient damping (2) In order to ensure the amplitude of PSS in the local oscillation mode (in the high-frequency range), some units set the PSS gain to a large value, resulting in low-frequency If the PSS amplitude is too large, the generator will fluctuate in reactive power during normal operation

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