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中点钳位型三电平变换器两种故障状态的检测和保护

, PP. 70-76

Keywords: 三电平钳位型变换器,故障状态,器件短路故障,接地故障检测

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Abstract:

针对中点钳位型三电平变换器的故障和保护进行研究,主要讨论系统的单相接地故障和电力电子器件短路故障。单相接地故障会引起变换器直流母线中点接地阻抗上的电压明显变化,提出一种通过检测接地阻抗电压从而检测系统接地故障的方法。变换器桥臂内侧电力电子器件的短路可以导致直流母线电容电压的不平衡,会出现电容电压的翻倍现象,须采取措施保护直流母线电容和电力电子器件。在分析电压翻倍现象产生原因的基础上,提出了抑制电容电压翻倍的方法。对以上两种故障状态的检测和保护进行了仿真和试验验证,仿真和试验结果验证了所提出方法的有效性。

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