Sub-synchronous oscillation suppression method based on controlled series compensation

A technology of subsynchronous oscillation and additional control, applied in the direction of reducing/preventing power oscillation, AC network to reduce harmonics/ripple, harmonic reducing device, etc., can solve the problem that subsynchronous oscillation cannot be completely suppressed.

Inactive Publication Date: 2010-09-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this can reduce costs and slow down subsynchronous oscillations to a certain extent, it often cannot completely suppress the occurrence of subsynchronous oscillations

Method used

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  • Sub-synchronous oscillation suppression method based on controlled series compensation
  • Sub-synchronous oscillation suppression method based on controlled series compensation
  • Sub-synchronous oscillation suppression method based on controlled series compensation

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Embodiment Construction

[0041] The specific implementation of the present invention will be described in detail below in conjunction with the drawings and examples, but the present invention is not limited by the specific examples.

[0042] The test system used is based on the IEEE SSR first standard test system, such as image 3 shown. Replace part of the fixed series compensation capacitors in the original system with controllable series compensation, the total series compensation degree of the line is 45%, and the reactance of TCSC is X TCSC It accounts for 20% of the total series-compensated reactance, and its standard unit value is shown in image 3 . TCSC adopts open-loop constant impedance control, and the characteristic parameters of the main circuit of TCSC are taken TCSC reference firing angle α 0 is 158.8°. Select the operation mode of the generator as P G =0.9pu, the power factor is 0.9 (lag). The shafting of the generator is composed of six concentrated masses of high pressure cy...

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Abstract

The invention relates to a sub-synchronous oscillation suppression method based on controlled series compensation, which is based on the concept of damping torque, adopts a design method of phase compensation, and carries out proper amplification and phase shift processing on speed signal delta omega to generate an additional control signal to modulate a TCSC (Thyristor Controlled Series Capacitor) trigger angle. Therefore, equivalent reactance of the TCSC is changed, the TCSC can provide positive electrical damping in the entire sub-synchronous frequency range, and the problem of SSR (Sub-Synchronous Resonance) caused by series compensation capacitors can be thoroughly eliminated.

Description

technical field [0001] The invention proposes a subsynchronous oscillation suppression method based on a thyristor-controlled series capacitor (ie, controllable series compensation), which belongs to an innovative technology of power system control. Background technique [0002] The addition of series capacitance compensation to transmission lines can improve the transmission capacity, so it has been widely used in the world. However, fixed series capacitor compensation with high series compensation may cause subsynchronous resonance of the power system, which will cause damage to the shafting of the turbogenerator, seriously affecting the safe operation of the power system. [0003] With the development of power electronic devices, Thyristor Controlled Series Capacitor (TCSC) has received more and more attention in suppressing subsynchronous resonance in recent years because of its high system response speed. The basic module of TCSC consists of a capacitor C connected in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/01
CPCY02E40/40
Inventor 周少华金逸林彭勃
Owner ZHEJIANG UNIV
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