摘要
电压源型换流器易在高频谐波频段呈现负阻尼从而引起谐振现象,昆柳龙直流工程作为特高压多端混合直流输电工程,需对其柔性直流受端柳州、龙门换流站的高频谐波谐振风险进行评估分析。基于阻抗分析法分析柔性直流换流站控制链路延时、前馈滤波、控制器参数对柔性直流交流阻抗变化趋势的影响,分别考虑22种、34种交流线路工况,对受端柳州站和龙门站的多种运行工况进行交流系统谐波阻抗扫描计算,由结果可知龙门站相较柳州站具有更高的高频谐波谐振风险,为避免发生谐振,龙门站应在前馈中加入100Hz低通滤波器,控制链路延时为300μs,但会影响动态响应性能。提出了相应的高频谐波谐振风险抑制方法,能够为昆柳龙直流工程的高频谐波谐振风险抑制提供参考。
The voltage source converter is prone to negative damping in the high-frequency harmonic band,thus causing resonance phenomena.The Kun-Liu-Long DC project,as a UHV multi-terminal hybrid DC transmission project,needs to evaluate and analyse the high-frequency harmonic resonance risk of its flexible DC converter stations in Liuzhou and Longmen.Based on the impedance analysis method,an analysis is made of the impact of control link delay,feedforward filtering and controller parameters on the change trend of AC impedance of flexible DC converter stations.22 and 34 AC line operating conditions are considered respectively,and the AC system harmonic impedance scanning calculation is carried out for various operating conditions of Liuzhou Station and Longmen Station at the receiving ends.To avoid resonance,a 100 Hz low-pass filter should be added to the feedforward of the gantry station,with a control link delay of 300μs,which will affect the dynamic response performance.The corresponding high-frequency harmonic resonance risk suppression method is proposed,which can provide a reference for suppression of the high-frequency harmonic resonance risk of the Kun-liu-long DC project.
作者
徐攀腾
朱博
喻文翔
宋述波
杨学广
樊友平
XU Panteng;ZHU Bo;YU Wenxiang;SONG Shubo;YANG Xueguang;FAN Youping(Guangzhou Bureau of China Southern Power Grid Co.,Ltd.EHV Transmission Company,Guangzhou 510500,China;School of Electrical and Automation,Wuhan University,Wuhan 430072,China)
出处
《中国电力》
CSCD
北大核心
2022年第3期9-17,共9页
Electric Power
基金
国家重点研发计划资助项目(2016YFB0900903)。
关键词
昆柳龙直流工程
高频谐波谐振
谐波阻抗扫描
柔性直流
风险抑制方法
Kun-Liu-Long DC project
high frequency harmonic resonance
harmonic impedance scanning
flexible DC
risk suppression method
