Method for realizing composite power system stabilizer

A technology of a power system and an implementation method, which is applied in the direction of controlling generators through changes in magnetic field, parallel feeding arrangement of a single network, etc., can solve problems such as the inability to improve the stability of small disturbances of the system

Inactive Publication Date: 2008-09-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of the fuzzy logic control power system stabilizer is that it cannot improve the small disturbance stability of the system...

Method used

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  • Method for realizing composite power system stabilizer
  • Method for realizing composite power system stabilizer
  • Method for realizing composite power system stabilizer

Examples

Experimental program
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Embodiment 1

[0048] The implementation method of the composite power system stabilizer provided by the present invention is to insert a fuzzy logic control unit between the excitation control system and the linear lead-lag power system stabilizer. Its structure is as follows: figure 1 As shown, the dotted box in the figure is the fuzzy logic control unit. The fuzzy logic control unit includes a phase plane comparison unit and a logic reasoning unit.

[0049] The input signal of the phase plane comparison unit includes the discretized generator angular velocity deviation signal Δω and the discretized generator power angle deviation signal Δδ.

[0050] φ is an undetermined parameter that needs to be adjusted by the composite power system stabilizer, and its value ranges from 0 to 10 degrees. On the phase plane with the input signal Δω as the vertical coordinate and Δδ as the horizontal coordinate, the vertical axis and A straight line with an angle of 45 degrees and φ degrees between the o...

Embodiment 2

[0071] The compound power system stabilizer of the present invention can adopt 32 microprocessors and digital signal processor (DSP) to realize, as figure 2 shown. and figure 1 The components of the composite power system stabilizer shown in , such as DC blocking filter, integrator, lead-lag and gain amplification, etc., are already mature technologies, and can be programmed in C language to perform floating point on DSP. computing implementation;

[0072] In order to show the damping control effect of the compound power system stabilizer, the above compound power system stabilizer is image 3Simulation calculations were carried out on the shown IEEE four-machine system. The simulation conditions are as follows: all four generators adopt a dual-axis model with fast excitation control; only generator No. 4 is equipped with a linear lead-lag power system stabilizer or a compound power system stabilizer; Three-phase short circuit, disappear after 0.1s, after disturbance i...

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Abstract

This invention relates to a method for realizing a complex PSS, which adds a fuzzy logic control unit (including a phase plane comparison unit and a logic consequence unit) based on a traditional linear lead-lag PSS, in which, the fuzzy logic control unit is used in modifying the output signal of the traditional linear lead-lag PSS to improve the control result of the PSS to power system power oscillation, both the complex PSS and traditional linear PSS can improve the stability of small harass of the system and stop the system to generate spontaneous power oscillation, and the fuzzy logic control unit can avoid damp control caused by non-linearity of the system to increase the damp control robustness of the traditional PSS.

Description

【Technical field】: [0001] The invention relates to a structure and a realization method of a composite power system stabilizer. 【Background technique】: [0002] The power system stabilizer is an additional controller of the excitation control system, which is used to improve the small-signal stability of the power system and improve the ability of the power system to suppress low-frequency power oscillations. It uses signals related to system power oscillations (such as generator active output power , speed or frequency) as input, and the generated output signal is fed back to the excitation regulator. The use of the power system stabilizer can avoid the power oscillation induced by small disturbances in the power system, and at the same time have the function of damping power system power oscillations after large disturbances. It is one of the important control devices to improve the dynamic stability of the power system. [0003] Excitation control systems and linear lead...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02P9/14
Inventor 房大中
Owner TIANJIN UNIV
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