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Achieving method for quasi-proportion resonant type electrical power system stabilizer

A quasi-proportional resonance, power system technology, applied in the direction of reducing/preventing power oscillation, can solve the problems of no resonance oscillation suppressing device, affecting the oscillation mode, system instability, etc., achieving good suppression effect and reducing the effect of amplitude

Inactive Publication Date: 2014-11-26
SOUTHEAST UNIV
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Problems solved by technology

The increase of the gain of the traditional power system stabilizer will affect the frequency range of the entire low-frequency oscillation. Therefore, the traditional power system stabilizer can only increase the damping of the oscillation mode to 0.1-0.3. If the damping of a certain mode is increased, will affect other oscillation modes, resulting in system instability
At present, traditional power system stabilizers are generally installed in the system to suppress low-frequency oscillations, and there is no special suppression device for resonance oscillations

Method used

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  • Achieving method for quasi-proportion resonant type electrical power system stabilizer
  • Achieving method for quasi-proportion resonant type electrical power system stabilizer
  • Achieving method for quasi-proportion resonant type electrical power system stabilizer

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and example the present invention will be further described.

[0030] figure 1 It is a schematic diagram of the principle of the present invention, and a typical single-machine infinite system is taken as an example below to illustrate the specific implementation of the present invention. The structural block diagram of the single-machine infinite system is as follows: figure 2 As shown, the system includes generators and excitation systems, steam turbines and speed control systems, transformers, and loads, which are connected to the infinite system through tie lines. The rated capacity of the generator is 200MW, the rated voltage is 13.8kV, the rated frequency is 60Hz, and the load rate is 0.75p.u. The excitation system adopts the DC exciter model, and the governor adopts the hydraulic turbine governor model. The resonant oscillation frequency of the system is about 1.48Hz. The quasi-proportional resonant power system...

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Abstract

The invention discloses an achieving method for a quasi-proportion resonant type electrical power system stabilizer. The achieving method includes the following steps that oscillation signals are collected through a measurement link, deviation signals are obtained through a blocking link, the deviation signals are adjusted through a quasi-proportion resonant control link, and then the deviation signals are output to a lead lag link to be compensated. Finally, output signals are obtained after amplitude limiting is conducted through an amplitude limiting link, the output signals are overlapped to the reference voltage of a generator excitation regulator, and the reference voltage is adjusted. According to the achieving method for the quasi-proportion resonant type electrical power system stabilizer, the defect that a traditional electrical power system stabilizer cannot greatly increase damping at resonance frequency points to restrain resonance mechanism low-frequency oscillation is overcome through quasi-proportion resonant control, so that great gain is provided for a resonance oscillation mode only at the resonance frequency points, damping of the resonance oscillation mode is greatly improved, and the resonance mechanism low-frequency oscillation can be effectively restrained without affecting other oscillation modes. The method is simple in stabilizer parameter design and convenient to implement and has great practical value.

Description

technical field [0001] The invention relates to the field of power system stability control, in particular to a method for realizing a quasi-proportional resonance type power system stabilizer. Background technique [0002] Low-frequency oscillation is one of the main problems that endanger the safe and stable operation of power systems. There are two main mechanisms for its generation: negative damping mechanism and resonance mechanism. Among them, the low-frequency oscillation of the resonance mechanism is caused by the frequency of the external periodic power disturbance source being close to the inherent low-frequency oscillation frequency of the system. [0003] The power system stabilizer is the main measure to suppress the low-frequency oscillation of the power system at present. It is based on the principle of phase compensation to suppress the low-frequency oscillation by adjusting the excitation reference voltage of the generator. The traditional power system stab...

Claims

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Application Information

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IPC IPC(8): H02J3/24
Inventor 蒋平冯双吴熙
Owner SOUTHEAST UNIV
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