基于多谐振控制器的MMC简化环流抑制策略

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摘要模块化多电平变换器(MMC)的内部环流主要由直流分量和偶次谐波分量组成。环流谐波分量会提高对开关器件的要求,严重时甚至会影响MMC稳定工作,因此有必要对环流进行抑制。为了获取环流直流分量,设计了数字低通滤波器,依据MMC环流成分组成公式计算出环流偶次谐波分量和,在此基础上,提出基于多谐振控制器的MMC简化环流抑制策略。此外,构建了MMC环流闭环控制模型。在详细分析准比例谐振控制器各参数对系统稳定性影响的基础上,设计二次准谐振控制器参数,为环流控制器参数设计提供了依据。最后通过实验研究,证明所提出的简化环流抑制策略能有效降低环流谐波分量,减小桥臂电流畸变,有利于MMC稳定工作。

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关键词 ：模块化多电平变换器, 环流, 数字低通滤波器, 多谐振控制器

Abstract：The main circulating current constituents of the modular multilevel converter(MMC)are the DC component and the even circulating harmonic currents.The circulating harmonic currentsincrease the requirements on the switching device and evenendangerthe stability of the MMC.Therefore,it is necessary to suppress the circulating harmonic currents.In order to obtain the DC component of the circulating current,a digital low pass filter is designed.According to the circulating current of the MMC components composition formula,the sum of the even circulating harmonic currentsiscalculated.Thena simplified circulating current suppressing strategy is presentedfor the MMC based on multi-resonant controllers.In addition,the model of the MMC circulating current closed loop is constructed.Based on the explicit analysis of the quasi-proportional-resonant controller parameters influencingthe system stability,the secondaryquasi-resonant controllerparameters are designed which provide the basis for designingthe circulating controller parameters.Experiment results show that theproposed strategy can not only effectively suppress the circulating harmonic components in thecirculating current,but also improve the leg current distortion,which is beneficialfor improving the stability and reliability of the MMC.

Key words： Modular multilevel converter circulating current digital low pass filter multi-resonant controller

收稿日期: 2015-04-08 出版日期: 2016-07-15

PACS:

TM46

基金资助:江苏省煤矿电气与自动化工程实验室建设项目(2014KJZX05)和江苏省普通高校研究生科研创新计划项目(KYLX_1384)资助。

作者简介: 伍小杰男,1966年生,教授,博士生导师,研究方向为电力电子与电力传动、电机控制与保护等。E-mail:zgcumt@126.com;杨超男,1991年生,硕士研究生,研究方向为电力电子与电力传动。 E-mail:820248739@qq.com(通信作者)

引用本文:

伍小杰,杨超,公铮,戴鹏. 基于多谐振控制器的MMC简化环流抑制策略[J]. 电工技术学报, 2016, 31(13): 74-81. Wu Xiaojie ,Yang Chao ,Gong Zheng, Dai Peng. Simplified Circulating Current Suppressing Strategy for MMC Based on Multi-Resonant Controller. Transactions of China Electrotechnical Society, 2016, 31(13): 74-81.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I13/74

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