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电网技术  2015 

基于母线测量导纳变化的微电网保护

DOI: 10.13335/j.1000-3673.pst.2015.06.045, PP. 1751-1758

Keywords: 微电网,内部故障,母线测量导纳,保护

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Abstract:

微电网内部故障时,微源中的逆变器会限制短路电流幅值的升高,故障电流较小难以检测,致使传统保护失效。为此,提出了一种基于母线上导纳量的变化为判据的微电网保护方案,该方案采用测量导纳的幅值为判据,由于它是电压、电流共同作用的结果,故障前后的测量导纳幅值变化明显,克服了传统电流保护方案的不足;同时采用测量导纳相角的变化作为辅助判据,可以有效地区分微电网的区内外故障,实现故障的检测与定位。利用PSCAD/EMTDC进行仿真,仿真结果验证了所提方案的有效性。

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