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模块化多电平换流器桥臂电流分析及其环流抑制方法
引用本文:李国庆,辛业春,吴学光.模块化多电平换流器桥臂电流分析及其环流抑制方法[J].电力系统自动化,2014,38(24):62-67.
作者姓名:李国庆  辛业春  吴学光
作者单位:东北电力大学电气工程学院, 吉林省吉林市 132012
基金项目:国家自然科学基金项目(51377016);国家电网公司“千人计划”专项支持项目(国家电网科[2013]1111号文)
摘    要:为了抑制模块化多电平换流器(MMC)内部环流,对MMC桥臂电压的波动和环流产生的机理进行了分析,提出了一种抑制环流的补偿控制方法。MMC在进行功率交换时,由于桥臂电流的作用,导致子模块电容电压发生周期性的变化,采用平均值的方法分析得出子模块电容电压包含直流分量和交流分量。采用最近电平调制法进行换流器电压调制,由于子模块电容电压含有直流分量以及基频分量偏差,导致桥臂电压与期望值间存在基频偏差和二倍频等分量,从而产生环流。通过对桥臂电压与期望值的偏差量进行补偿,能够消除桥臂电压的偏差,从而抑制换流器桥臂间的环流。在PSCAD/EMTDC中搭建了11电平MMC双端直流输电系统,仿真结果验证了所提方法的有效性。

关 键 词:柔性直流输电  变流器  电压偏差  环流抑制  谐波
收稿时间:2014/3/19 0:00:00
修稿时间:2014/11/20 0:00:00

Arm Current Analysis of Modular Multilevel Converter and Its Circulating Current Suppressing Method
LI Guoqing,XIN Yechun and WU Xueguang.Arm Current Analysis of Modular Multilevel Converter and Its Circulating Current Suppressing Method[J].Automation of Electric Power Systems,2014,38(24):62-67.
Authors:LI Guoqing  XIN Yechun and WU Xueguang
Affiliation:School of Electrical Engineering, Northeast Dianli University, Jilin 132012, China
Abstract:In order to prevent the modular multilevel converter (MMC) internal circulation, an analysis is made of the voltage fluctuation and circulation generating mechanism of the MMC bridge arm, and a kind of compensation control method for circulation inhibition is proposed. When the MMC power exchange is in progress, the effect of bridge arm current causes the periodic change in the submodule capacitor voltage. It has found that submodule capacitor voltage contains DC component and AC component using the average value analysis method. For converter voltage modulation using the nearest level modulation method, it has been found that, as the submodule capacitor voltage contains DC component and fundamental component deviation, there exists fundamental frequency deviation and double frequency component between bridge arm voltage and the expected value, resulting in the circulation. By compensating for the bridge arm voltage and expected value deviation, it will be possible to eliminate bridge arm voltage deviation, thereby suppressing the circulation among the converter bridge arms. The 11-level MMC DC transmission system is set up in PSCAD/EMTDC, with the effectiveness of the method proposed verified by simulation results.
Keywords:voltage source converter based high voltage direct current (VSC-HVDC)  converter  voltage deviation  circulating current suppressing  harmonic
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