电力系统保护与控制2024，Vol.52Issue(4)：56-66,11.DOI:10.19783/j.cnki.pspc.230957
一种抑制连续换相失败的定关断角加速控制方法
A constant extinction angle acceleration control method for suppressing continuous commutation failure
摘要
Abstract
There is a problem of continuous commutation failure(CCF)of an LCC-HVDC transmission system caused by an AC fault on the inverter side.Thus this paper first analyzes the variation of electrical quantity and control quantity in the recovery process of the first commutation failure(FCF),and clarifies that improper cooperation between constant current(CC),constant extinction angle(CEA)and current error control(CEC)in the recovery process is an important cause of CCF.After the asymmetrical fault,the DC second harmonic current caused by the AC negative-sequence current will lead to the delay of the control switching point and increase the risk of CCF.Based on this,a constant extinction angle acceleration(CEAA)control method is proposed,one which can enhance the coordination effect of controllers.This method can adaptively switch according to the commutation recovery process.It uses the extinction angle deviation to dynamically adjust the CEA command,realizes the control switching in advance,and reduces the influence of improper control after switching.At the same time,the method reduces the harmonic current by the notch filter.This can reduce the adverse effect of controller switching by reducing the firing angle wave.This method can improve the coordination effect between controllers,thus improving the ability of a DC system to resist CCF.The correctness of the theoretical analysis and the effectiveness of the optimization method are verified in the CIGRE model.关键词
连续换相失败/控制器配合不当/定关断角控制/负序电流Key words
CCF/improper coordination of controller/constant extinction angle control/negative-sequence current引用本文复制引用
王玉麟,李晓华,李昊,李书勇,郑艺欣..一种抑制连续换相失败的定关断角加速控制方法[J].电力系统保护与控制,2024,52(4):56-66,11.基金项目
This work is supported by the Joint Fund Project for Smart Grid of National Natural Science Foundation of China-State Grid Corporation of China(No.(U1766213). 国家自然科学基金委员会-国家电网公司智能电网联合基金项目资助(U1766213) （No.(U1766213）
国家自然科学基金项目资助(51677073) （51677073）
