王铁柱;卜广全;王姗姗;董毅峰;侯俊贤;王毅;

• 1:电网安全与节能国家重点实验室(中国电力科学研究院有限公司)

摘要(Abstract)：

柔性直流输电技术被认为是目前应用于新能源大规模接入的较好解决方案,且可接入弱交流系统。柔性直流输电工程大多基于模块化多电平换流器(modular multilevel converter,MMC),工程中MMC采用最近电平逼近调制(nearest level modulation,NLM)策略。在系统发生扰动或故障使得直流电压波动时,采用传统NLM调制策略的MMC换流器输出的交流电压稳定性较差。该文分析了传统NLM调制策略存在以上缺陷的原因,并针对该原因,提出了一种考虑子模块电容电压实际值的改进调制策略,从而使MMC输出的交流电压在系统扰动时具有较好的鲁棒性。通过在PSCAD/EMTDC中搭建电磁暂态模型并进行仿真分析,验证了该文提出的改进调制策略可以有效提升MMC换流器输出交流电压的鲁棒性。

关键词(KeyWords)： 柔性直流;模块化多电平换流器;最近电平逼近调制;交流电压鲁棒性;改进调制策略

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2016YFB0900601);; 国家电网公司科技项目(XT71-15-066)~~

作者(Author): 王铁柱;卜广全;王姗姗;董毅峰;侯俊贤;王毅;

Email:

DOI: 10.13335/j.1000-3673.pst.2017.1463

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