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基于柔性接地技术的配电网三相不平衡过电压抑制方法

DOI: 10.13334/j.0258-8013.pcsee.2014.04.021, PP. 678-684

Keywords: 配电网,位移电压,三相不平衡,有源逆变,注入电流

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Abstract:

配电网三相对地参数不平衡会产生三相不平衡电压,一般采用投切电容器或电抗器补偿三相不平衡参数,抑制不平衡电压,但该方法补偿的精度和速度有限,难以彻底而迅速地实现三相不平衡过电压抑制。因此,在前期发明的柔性接地技术(专利201110006701.2)基础上,提出配电网三相不平衡过电压抑制新方法。通过PWM有源逆变向配电网注入零序电流补偿三相对地不平衡电流,实现对零序电压的控制,从而抑制三相不平衡过电压。仿真分析结果表明,所提方法可有效抑制三相不平衡过电压,能够将中性点位移电压限制为零。

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