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电网技术  2015 

MMC-HVDC系统直流断线故障特性分析

DOI: 10.13335/j.1000-3673.pst.2015.07.010, PP. 1825-1832

Keywords: 直流断线故障,故障特性,MMC-HVDC,故障

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Abstract:

在柔性直流输电系统故障特性的研究中,对直流断线故障特别是模块化多电平换流器(modularmultilevelconverter,MMC)-HVDC系统的直流断线故障研究很少。基于对称单极主接线形式和模块化多电平拓扑结构,提出了系统直流断线故障发展过程中非故障直流母线上存在故障电流的新特性。首先,分析了非故障直流母线上故障电流产生的机理;其次,按照换流站运行及控制模式的不同,从直流场、交流场和换流阀3个方面对故障电流引起的系统电压电流变化特性进行了分析,并推导了故障电流的计算表达式;再次,从继电保护的角度分析了故障电流对整个柔性直流输电系统的影响;最后,基于PSCAD/EMTDC搭建了双端系统进行仿真,验证了故障特性分析的正确性。

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