级联H桥STATCOM抑制电网电压不平衡控制策略研究  

Research on Voltage Unbalance Control Strategy of Cascade H-bridge STATCOM

作　　者：张晓虎 杨杰[1] ZHANG Xiaohu;YANG Jie(School of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou 412000,China)

机构地区：[1]湖南工业大学电气与信息工程学院,湖南株洲412000

出　　处：《电工技术》2020年第19期13-16,共4页Electric Engineering

基　　金：湖南省教育厅重点项目(编号19A134)。

摘　　要：针对不平衡负载引起的电网三相不平衡问题,提出利用STATCOM输出负序电流的方式来保证交流侧PCC处电网的平衡。该方案主要采用了直流侧电压均衡控制、三相级联H桥调制部分、电压和电流双闭环、正负序提取算法、负序电流前馈等控制算法。仿真和试验表明,该方法可在保证直流侧电压稳定的基础上,有效解决由负载不平衡引起的电网不平衡问题。In order to solve the three-phase imbalance problem caused by unbalanced load,a negative sequence current output method by STATCOM was proposed to ensure the balance of the power grid at the AC side PCC.The main control algorithms used in the scheme were:DC side voltage equalization control,three-phase cascade H-bridge modulation part,voltage and current double closed-loop,positive and negative sequence extraction algorithm,negative sequence current feed forward,etc.Simulation and experiment showed that the method could effectively solve the problem of power grid imbalance caused by load imbalance on the basis of ensuring the DC side voltage stability.

关 键 词：静止同步补偿器 公共连接点PCC处平衡 负载不平衡 负序注入 无功补偿 

分 类 号：TM714[电气工程—电力系统及自动化]