抑制零序三次谐波电流方法研究-中国电机工程学会.PDFVIP

抑制零序三次谐波电流方法研究 李国栋 1 ，冯力鸿 2 ，顾 强 1 ，徐永海 2 1．天津电力科学研究院，天津市，300022 ； 2 ．华北电力大学电力系统保护与动态安全监控教育部重点实验室，北京市，102206 Study of Reducing Zero-Sequence Harmonics by Zig-Zag Transformer 1 2 1 2 LI Guo-dong , FENG Li-Hong , GU Qiang ,XU Yong-hai 1.Tianjin Electric Power Science Research Institute, Tianjin 300022; 2.Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education, NCEPU, Beijing 102206 ABSTRACT: The third harmonics of the nonlinear loads 谐波不平衡过大时，此方式抑制谐波的效果变差的结 result in a significant neutral current in the distribution power 果。指出了应用曲折接线变压器抑制零序谐波的若干 system. It is bad for power system. This paper took the analysis 适用场合。 and emulation on each harmonic filter method, especially the 关键词: 零序三次谐波；滤波器；曲折接线变压器；滤 zig-zag transformer method. Filter efficiency of each method 波效果 has been given out. The zig-zag transformer can attenuate the zero-sequence harmonics. This paper makes detailed analysis 1 引言 and simulation for applying this mode to reduce third harmonics. The influence of leakage reactance, unbalance 随着城市的现代化发展，大型商厦及写字楼不断 utility voltage and unbalance third harmonic current to the 增加，这些建筑中存在大量计算机、办公自动化设备、 filter efficiency of this mode has been analyzed. The simulation 变频空调、荧光灯、节能灯及其镇流器、大型显示屏 results show that the filter efficiency become bad when leakage 幕、不间断电源等非线性用电设备[1]~[4] 。这些设备工 reactance has been increased or under the situation of 作时都会在电网中产生大量的谐波，从而对电力系统 unbalance utility vo