基于负序电流前馈的星型链式STATCOM链间均压策略  

Clustered DC Voltage Balancing Control of Star-Connected Cascaded STATCOM Based on Negative Current Feed-Forward Control

作　　者：冯宇鹏 王先为 吴金龙 王林[2] 左广杰[2] 潘爱强[3] 

机构地区：[1]西安许继电力电子技术有限公司,陕西省西安市710075 [2]许继集团有限公司,河南省许昌市461000 [3]国网上海市电力公司,上海市浦东新区200437

出　　处：《电网技术》2016年第5期1502-1508,共7页Power System Technology

基　　金：国家电网公司科技项目(5209401350BW)~~

摘　　要：针对星型链式静止同步补偿器(static synchronous compensator,STATCOM)在电网电压不平衡故障下链间直流母线电压不均衡的问题,首先对负序电流注入法的链间均压机理进行了理论分析,然后推导了负序dq轴电流与换流链有功功率的关系,求解了负序dq轴电流的稳态表达式;提出了一种新的基于负序电流前馈加闭环的链间均压控制策略。仿真分析与工业样机实验结果表明,所提出的链间均压策略达到了电网不平衡故障下换流链间直流母线电压平衡的目的,并且具有实现简单,响应速度快,直流母线电压动态波动小和电流冲击小的特点。For DC bus voltage imbalance between clusters of star-connected STATCOM under unbalanced grid voltage faults,mechanism of negative sequence current injection method is analyzed.Relationship between negative sequence d-q axis current and active power of clusters is derived.Negative sequence d-q axis current under steady-state is calculated and a new dc voltage balance control strategy among clusters is proposed,composed of feed-forward control and closed-loop control.Results of simulation and industrial prototype experiments show that dc voltage of clusters becomes balanced under unbalanced faults with the proposed control strategy.Besides,the strategy is characterized with easy realization,fast response,and small dc bus voltage fluctuation and current surge.

关 键 词：电网不平衡 星型链式STATCOM 负序电流 均压策略 

分 类 号：TM714[电气工程—电力系统及自动化]