TNPC并联静止同步补偿器不平衡负荷控制策略  

Unbalanced Load Control Strategy for TNPC Parallel Static Synchronous Compensator

作　　者：陈忠[1] CHEN Zhong(Guangdong Polyteclmic of Water Resources and Electric Engineering,Guangzhou 510925,China)

机构地区：[1]广东水利电力职业技术学院,广州510925

出　　处：《电力电容器与无功补偿》2018年第4期47-53,共7页Power Capacitor & Reactive Power Compensation

摘　　要：配电网中不平衡负荷的增加会带来电网的损耗增大、关键设备过流甚至损坏等问题,针对此问题本文主要研究基于TNPC并联静止同步补偿器在配网不平衡负荷条件下系统控制策略研究。三电平并联变流器因为高效、灵活等特点,成为解决配网不平衡负荷的有效方案。为了综合考虑不平衡和TNPC三电平并联系统控制,首先建立TNPC并联环流等效模型,分析零序环流特性;之后通过零序注入调制方式完成对并联系统零序电流控制,在此基础上通过调制波分解保证直流侧中点平衡控制,使得并联静止同步补偿器在不平衡负荷下零序电流和中点平衡实现解耦控制。最后搭建TNPC并联补偿器实验平台,验证了控制策略的有效性。With the unbalance load increasing in the distribution network,the network loss raises and the key equipment may become overcurrent even damage. For this problem the unbalance load control strategy of TNPC parallel static synchronous compensator is presented. Because of the efficiency and flexibility,parallel three level converter is the efficient solution for unbalance load in distribution network. For the unbalance load and TNPC parallel system,the equivalent model of TNPC parallel circulating current is established,and the zero sequence circulating current characteristic is analyzed. According to the zero sequence voltage injection modulation,the zero sequence circulating current is controlled. Then the DC neutral balance is controlled with modulation waveform decomposition, the zero sequence current and neutral point balance decoupling control parallel static synchronous compensator under unbalanced load is realized. Finally,the experimental platform of TNPC parallel STATCOM is built to verify the effectiveness of the coordination control strategy.

关 键 词：TNPC三电平 并联 零序环流 不平衡负荷 中点平衡 

分 类 号：TM46[电气工程—电器] TM714