电气工程学报 ›› 2019, Vol. 14 ›› Issue (4): 72-78.doi: 10.11985/2019.04.011

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基于有源滤波器的电网三相负载不平衡补偿策略

曹洪,夏令,刘盛,蔡祖军,王浩   

  1. 国网四川省电力公司乐山市沙湾供电分公司 乐山 614900
  • 收稿日期:2019-08-25 出版日期:2019-12-25 发布日期:2020-03-18
  • 作者简介:曹洪,男,1990年生,中级工程师。主要研究方向为电力系统电能质量治理。E-mail:1427288652@qq.com

Three-phase Load Unbalance Compensation Strategy Based on Active Power Filter

Hong CAO,Ling XIA,Sheng LIU,Zujun CAI,Hao WANG   

  1. Leshan Shawan Branch of Sichuan Power Supply Company of State Grid, Leshan 614900 China
  • Received:2019-08-25 Online:2019-12-25 Published:2020-03-18

摘要:

配电网三相不平衡问题会影响电能质量、造成电力系统不稳定运行。目前,电力系统常用的接线方式为三相四线制,传统的针对三相三线制的补偿器只能抑制负序电流,而不能消除零序电流。针对该问题,提出了利用有源电力滤波器进行负载补偿。首先建立了有源滤波器的数学模型,然后分析了补偿电流的监测方法,推导了有源电力滤波器的补偿特性,并在Matlab/Simulink中搭建了三相四线制的补偿模型,对正常性不平衡和故障性不平衡进行了仿真,通过试验结果验证了该方案能够有效减小三相负荷不平衡度。

关键词: 三相不平衡, 三相四线制, 有源电力滤波器, 负载补偿

Abstract:

Three-phase unbalance of distribution network will affect power quality and cause unstable operation of power system. At present, three-phase four-wire system is commonly used in power system. The traditional compensator for three-phase three-wire system can only suppress negative sequence current, but cannot eliminate zero sequence current. To solve this problem, a method that use active power filter for load compensation is proposed. Firstly, the mathematical model of active power filter is established, then the monitoring method of compensation current is analyzed, and the compensation characteristics of active power filter are deduced. A three-phase four-wire compensation model is built in Matlab/Simulink. The normal and fault-type unbalances are simulated. The experimental results verify the proposed model. The scheme can effectively reduce the unbalance of three-phase load.

Key words: Three-phase unbalance, three-phase four-wire system, active power filter, load compensation

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