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电网技术  2015 

电容换相换流器串联电容补偿度优化研究

DOI: 10.13335/j.1000-3673.pst.2015.05.015, PP. 1268-1274

Keywords: 电容换相换流器,阀电压,补偿度,熄弧角,换相失败,全补偿,谐振

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Abstract:

为了探究电容换相换流器中串联电容的取值问题,建立了电容换相换流器(capacitorcommutatedconverter,CCC)的稳态模型,并利用Matlab软件进行数学分析,探讨了串联电容补偿度与串联电容电压、阀电压、阀峰值电压、直流电流、换相重叠角、触发角、视在熄弧角和实际熄弧角之间的关系,最终给出合适的串联电容补偿度的取值范围并进行仿真验证。研究结果表明补偿度的取值上、下限分别由阀峰值电压和实际熄弧角决定,其中阀峰值电压为主要限定因素;补偿度的可选范围涵盖欠补偿、全补偿和过补偿3种状态,且全补偿状态下CCC系统不会发生串联谐振;得出强受端系统下补偿度的可选范围为[0.92,1.4],而弱受端系统补偿度的可选范围为[0,1.08]。

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