基于改进复合控制的模块化多电平STATCOM环流抑制策略  

Circulating currents suppression strategy of MMC based STATCOM based on improved hybrid control

作　　者：李帆[1] 张志军[1] Li Fan;Zhang Zhijun(School of Electrical Engineering,Zhengzhou Railway Vocational&Technical College,Zhengzhou 451460,China)

机构地区：[1]郑州铁路职业技术学院电气工程学院

出　　处：《电测与仪表》2019年第22期139-145,共7页Electrical Measurement & Instrumentation

基　　金：2018年郑州铁路职业技术学院教科研基金项目(2018JKY003);国网河南电力公司科技资助项目(5217L015000R)

摘　　要：随着电网对无功补偿装置电压等级要求的提高,基于模块化多电平变流器的STATCOM逐渐成为研究热点。文章针对MMC自身运行机理在其桥臂上产生的严重环流问题展开研究。利用开关等效模型建立了MMC变流器的数学模型,并在此基础上分析了环流的产生机理及影响。据此,提出了一种重复控制+比例积分控制的复合控制的环流抑制方法,同时在MMC数学模型的基础上,利用小增益原理对重复控制器的稳定性进行了分析,并给出了衰减函数和超前补偿环节的设计方法。利用搭建的MMC-STATCOM仿真模型对所提环流抑制策略及稳定性分析的可行性和有效性进行了验证。With the increase of voltage level requirements for reactive power compensator,the modular multi-level converter(MMC)based static compensator(STATCOM)has gradually become a hot topic.However,there is a serious current circulation problem in the operation process of MMC because of its mechanism and the imbalance of the power grid.In this paper,the mathematical model of MMC converter is established by using the switch equivalent model,and the mechanism and influence of circulating current are analyzed.In order to solve this problem,a circulation suppression method based on the combination of repetitive control and proportional-integral control is proposed.And the stability of proposed strategy is analyzed using small-gain principle based on MMC model;meanwhile,the parameter design methods of decay function and lead-compensation term are given.Finally,the feasibility and validity of the proposed circulation suppression strategy and stability analysis are verified by MMC-STATCOM simulation model.

关 键 词：模块化多电平变流器 静止无功补偿器 数学模型 复合控制 环流抑制 

分 类 号：TM46[电气工程—电器]