Method for inhibiting sub-synchronous resonance on the basis of phase variation

A technology of sub-synchronous resonance and phase change, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, reactive power compensation, etc., can solve problems that have not been seen, and achieve improved results, easy implementation, and convenience combined effect

Active Publication Date: 2009-10-07
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
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Problems solved by technology

[0009] Among the existing technologies that use TCSC to suppress SSR, there is no technical solution that specifically designs an additional damping algorithm in the underlying control to suppress SSR

Method used

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  • Method for inhibiting sub-synchronous resonance on the basis of phase variation
  • Method for inhibiting sub-synchronous resonance on the basis of phase variation
  • Method for inhibiting sub-synchronous resonance on the basis of phase variation

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Embodiment Construction

[0041] The schematic diagram of the trigger level additional damping control structure of the present invention is as follows image 3 As shown, it includes the following links:

[0042] (1) Measure and sample to obtain local quantity data;

[0043] (2) Signal processing. Through high-pass filtering, band-pass filtering and other signal processing methods, the information of sub-synchronous frequency components is obtained from the local volume data obtained by measurement and sampling;

[0044] (3) Numerical calculation. Based on the information of the subsynchronous frequency component, the additional value Δα of the firing angle is calculated. There are many ways to obtain Δα, the goal of which is to improve the damping of the TCSC to the subsynchronous frequency mode;

[0045] (4) Limiting and data output. After Δα passes through the clipping link, the output command superimposed on the impedance control of the middle layer corresponds to the firing angle α 0 above, ...

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Abstract

The invention belongs to the thyristor controlled series compensation (TCSC) technology and relates to a method for inhibiting the sub-synchronous resonance on the basis of the phase variation of the circuit current relative to working frequency, in particular to a triggering-level control algorithm of the controlled series compensation, which adopts an additional damping control structure and achieves the purpose of inhibiting the sub-synchronous resonance by the fine-tuning of a controlled series compensation triggering angle. The invention particularly comprises the steps of calculating and obtaining the phase variation Delta t of measurement circuit current relative to the working frequency, which is caused by the sub-synchronous frequency circuit current component, and calculating the additional value Delta Alpha of the triggering angle according to the Delta t, etc.

Description

technical field [0001] The invention belongs to the technical field of controllable series compensation (TCSC), in particular to a method for suppressing subsynchronous resonance (SSR) of a power system, in particular to a trigger-level control algorithm of controllable series compensation, which adopts a trigger-level additional damping control Algorithm structure and a method of suppressing subsynchronous resonance based on the phase variation of line current relative to power frequency, through fine-tuning the trigger angle of controllable series compensation, the purpose of suppressing subsynchronous resonance is achieved. Background technique [0002] In order to increase the transmission capacity of long-distance high-voltage transmission system, series capacitor compensation technology is a very economical and effective measure. However, using a fixed series capacitor compensation technique may cause subsynchronous resonance (SSR). The use of controllable series comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/30Y02E40/40
Inventor 武守远汤海雁戴朝波王宇红
Owner CHINA ELECTRIC POWER RES INST
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