马星;李凤婷;尹纯亚;

• 1:可再生能源发电与并网技术教育部工程研究中心(新疆大学)

摘要(Abstract)：

针对研究发现的交直流系统中整流侧换流母线电压恢复导致逆变器关断角减小的问题。以CIGRE HVDC标准测试系统为例,分析了整流侧换流母线电压跌落时直流控制方式,将其以分段函数表示,联立直流准稳态模型推导建立了整流侧换流母线电压跌落程度不同时的关断角表达式。基于表达式分析得出整流侧换流母线电压跌落越大,电压恢复瞬间关断角越小,严重时会发生换相失败。为此,提出了一种改善整流侧换流母线电压恢复瞬间导致关断角过小的方法。基于PSCAD/EMTDC电磁暂态仿真软件利用CIGRE HVDC标准测试模型仿真验证了换流母线电压变化对关断角的影响,并从趋势上检验了理论分析的正确性和改进方法的有效性。

关键词(KeyWords)： 整流侧;换流母线电压;换相失败;交直流系统

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51877185);; 国网新疆电力有限公司科技项目(SGXJJY00GHJS1800065)~~

作者(Author): 马星;李凤婷;尹纯亚;

Email:

DOI: 10.13335/j.1000-3673.pst.2019.1809

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