| 一种改进的MMC电容电压均衡控制方法 |
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| 引用本文： | 郑连清,徐江涛,马世强.一种改进的MMC电容电压均衡控制方法[J].北京交通大学学报(自然科学版),2017,41(2). |
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| 作者姓名： | 郑连清 徐江涛 马世强 |
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| 作者单位： | 重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆,400044;新疆生产建设兵团兴新职业技术学校,乌鲁木齐,830074 |
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| 基金项目： | 国家自然科学基金(51577020)National Natural Science Foundation of China |
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| 摘 要： | 电容电压排序法是一种简单有效的MMC电容电压均衡方法,传统的排序算法会导致子模块反复投切,造成器件开关频率过高,增加了MMC的运行损耗.为此提出了一种改进的方法,即由允许的电容电压偏差大小和桥臂电流计算出维持子模块电压均衡所需的最小排序频率,并将排序频率控制在该最小值处,减少了不必要的子模块投切次数,从而在较低的开关频率下维持各子模块电压的均衡.在Simulink中搭建了MMC仿真模型,对改进前后的两种方法进行对比,仿真结果表明:改进的排序法能够有效降低开关频率,降幅可达70%.
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| 关 键 词： | 模块化多电平变换器 电压均衡 变频排序 开关频率 |
An improved control method for MMC capacitor voltage balancing |
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| ZHENG Lianqing,XU Jiangtao,MA Shiqiang.An improved control method for MMC capacitor voltage balancing[J].JOURNAL OF BEIJING JIAOTONG UNIVERSITY,2017,41(2). |
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| Authors: | ZHENG Lianqing XU Jiangtao MA Shiqiang |
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| Abstract: | The capacitor voltage sorting algorithm is a simple and effective method for equalizing MMC(Modular Multilevel Converter) capacitor voltages.However,the traditional sort algorithm leads to the submodules switched repeatedly.The high switching frequency increases the system loss.Therefore,an improved method is proposed,which can reduce the switching frequency by controlling the sorting frequency.The sorting frequency is the minimum for equalizing voltages that is calculated by the capacitor voltage difference and arm current.So the submodule voltages can be equalized at a low switching frequency.Finally,a MMC simulation model is built in Simulink to compare the two methods before and after the improvement.The simulation resuits show that the improved sorting method can effectively reduce the switching frequency,which the reduction is up to 70％. |
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| Keywords: | modular multilevel converter voltages balancing variable-frequency sort switching frequency |
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