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Method for implementing parallel power system stabilizer

A technology of power system and implementation method, which is applied in the parallel feeding arrangement of single network, controlling generator through magnetic field change, reducing/preventing power oscillation, etc., can solve the problem of large PSS amplitude, generator reactive power fluctuation, PSS compensation Insufficient degree and other problems, to achieve the effect of good adaptability, good amplitude-frequency characteristics and phase-frequency characteristics

Active Publication Date: 2011-01-12
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0025] 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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  • Method for implementing parallel power system stabilizer
  • Method for implementing parallel power system stabilizer
  • Method for implementing parallel power system stabilizer

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Embodiment Construction

[0061] The implementation manner of the present invention will be described below in conjunction with a specific example and the accompanying drawings.

[0062] As the output power of a large power station further increases, a weakly damped oscillation mode related to the power station appears in the system, and its characteristic value is: -0.098399±j5.550361, the oscillation frequency f=0.88Hz, and the damping ratio ξ=0.017726 . Time-domain solution calculations were performed using a transient stability program. The fault point is on the middle side of a tie line far away from the power station. If there is a single-phase short-circuit fault, the near-end faulty phase will be cut off in 0.09 seconds, the remote faulty phase will be cut off in 0.1 seconds, and the faulty phase will be reconnected after 1 second. The power angle swing curve of a generator in the station relative to another generator in the station is shown in the appendix Figure 4 . attached by Figure 4...

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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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24H02P9/14
Inventor 夏潮朱方刘增煌赵红光
Owner CHINA ELECTRIC POWER RES INST
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