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电网技术  2014 

杂散参数对IGBT串联阀开通过程的影响及抑制

DOI: 10.13335/j.1000-3673.pst.2014.08.026, PP. 2186-2192

Keywords: IGBT串联型电压源换流器,杂散电容,杂散电感,电流过冲,高频阻波器

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Abstract:

由于电压源换流器(voltagesourceconverter,VSC)的直流侧电压很高,绝缘栅双极型晶体管(insulatedgatebipolartransistor,IGBT)阀组的开关过程非常短,导致交流侧输出电压变化率非常高。该电压作用于交流侧对地杂散电容,会增加IGBT在开通瞬间的电流过冲,造成很大的开通应力,影响IGBT的安全稳定运行;且电压越高,影响越大。为此,首先对杂散参数对IGBT串联阀开通过程的影响进行了理论分析;在此基础上提出在阀侧装设阻波器抑制杂散参数引起的电流过冲,并给出了阻波器设计方案。仿真和实验结果验证了该措施的有效性。

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