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Method for mitigating sub-synchronous resonance

A sub-synchronous resonance and sub-synchronization technology, which is applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., to achieve the effect of easy implementation, convenient combination and improved effect

Active Publication Date: 2012-06-27
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
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AI Technical Summary

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 mitigating sub-synchronous resonance
  • Method for mitigating sub-synchronous resonance
  • Method for mitigating sub-synchronous resonance

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Embodiment Construction

[0044] 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:

[0045] (1) Measure and sample to obtain local quantity data;

[0046] (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;

[0047] (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;

[0048](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, a...

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Abstract

The invention relates to an equivalent method for mitigating sub-synchronous resonance on a power frequency based on sub-synchronous frequency capacitance voltage, in particular to a flip-flop stage control algorithm of a thyristor controlled series compensation, which belongs to the technology of the thyristor controlled series compensation (TCSC). The method is characterized in that a structurewith an additional damping control algorithm is adopted, and the method achieves the purpose of mitigating sub-synchronous resonance through trimming the trigger angle of the thyristor controlled series compensation. The method comprises the following steps: obtaining the sub-synchronous frequency components of the capacitance voltage, calculating the equivalent Uadd_s of the components in the half power frequency period, proximately calculating Uadd_s to cause a variable Delta x of the TCSC fundamental wave impedance lifting coefficient, and calculating a value added of the trigger angle Delta Alpha according to Delta x.

Description

technical field [0001] The invention belongs to the technical field of controllable series compensation (TCSC), relates to a method for suppressing subsynchronous resonance (SSR) of a power system, and specifically relates to a trigger-level control algorithm of controllable series compensation, which adopts a trigger-level additional damping control algorithm The structure and a method of suppressing subsynchronous resonance based on the equivalent of the subsynchronous frequency capacitor voltage on the power frequency can achieve the purpose of suppressing subsynchronous resonance by fine-tuning the trigger angle of the controllable series compensation. 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 ...

Claims

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Application Information

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