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电网技术  2007 

采用虚拟电阻的电力电容器保护法

, PP. 51-54

Keywords: 电力电容器组,保护,电力电子,虚拟电阻,谐振

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Abstract:

电力电容器易与系统阻抗发生谐振引起过电压和过电流,常规的谐振保护方法是在产生谐振时切除电容器组。作者分析了通过阻抗变换抑制谐振、保护电容器的机理,将瞬时无功谐波电流检测法引入到电压型逆变器,通过在电容器支路串联一个对基波有功功率和谐波分量呈正电阻性质的功率变换器实现在谐振情况下对电容器组的保护。由于该方法无需切除电容器,也保证了对系统正常的无功补偿。运用Matlab软件对某10kV配电系统中无功补偿电容器组的谐振保护进行仿真,结果表明了上述方法的正确性和有效性。

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