一种柱上三相四线制不平衡补偿新算法研究

Research on A New Algorithm of Three-phase Four-wire Unbalanced Compensation on the Column

负序和零序电流是柱上三相电流不平衡的主要原因。通过对柱上负序和零序电流的补偿可减轻三相不平衡带来的电网污染,减少电网功率损耗,提升供电质量。在不平衡电流补偿原理基础之上,根据柱上三相四线制特点,提出一种基于i_p-i_q法的改进三相i_p-i_q检测法。该方法实现了对不平衡系统中负序和零序电流的瞬时补偿,补偿实时性和补偿精度均有提高。通过仿真,验证了该算法能够对三相不平衡的负序和零序电流进行快速、精确补偿。

Negative sequence and zero sequence current are main reasons of the unbalanced three-phase current in the distribution network.The compensation of negative sequence and zero sequence current can reduce the pollution caused by the unbalanced three-phase network, reduce the power loss and improve the quality of power supply,In this article, by studying the current situation and development trend of unbalanced three phase, according to the characteristics of three-phase four wire system,an improved three-phase ip-iq detection method based on ip-iq is proposed.This method realizes the instantaneous compensation of negative sequence and zero sequence current in unbalanced system.The transient response and accuracy of the compensation are improved.The simulation results show that the proposed algorithm is able to compensate the negative and zero sequence current in unbalanced three phase network.