基于模块化多电平变换器的电流滞环跟踪型并网控制策略

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摘要基于电流滞环型双闭环并网控制策略运用于模块化多电平变换器（MMC）,实时监测电网电压、并网电流与给定电流误差,从而决定其网侧输出电压,使得并网电流快速、高效地跟踪给定电流;同时对并网电流脉动频率、开关频率做了详细分析,证明了该策略优越性。建立虚拟子模块,在此基础上根据子模块电容电压大小排序和桥臂电流方向,不断改变虚拟子模块与实际子模块驱动信号的循环映射关系,达到子模块电容电压动态平衡的目的。该控制方法适用于任意单元级联和任意电平数。设计了一台五电平MMC的实验样机对上述控制方法进行了实验验证。

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	吉宇
	梅军
	杜晓舟
	韩少华
	郑建勇

关键词 ：模块化多电平变换器, 电流滞环跟踪控制, 电流脉动频率, 虚拟循环映射, 电压平衡控制

Abstract：The principle of double closed-loop control strategy,which is based on the hysteresis- band current tracking control,can connect modular multilevel converter(MMC) with power grid. By real-time monitoring the voltage of the grid and the deviation between the output current and the given current, the output voltage is determined, and therefore the output current can track the given current quickly and efficiently. Switching frequency and the ripple frequency of grid current are analyzed in detail to prove the superiority of the strategy. Finally, the virtual submodule(VSM) is built,and by changing the loop mapping relationships between the VSMs and the real submodules, which is based on comparing the voltages of submodules and the direction of current in one arm, the voltages of the upper/lower arm’s capacitors can be well balanced. The proposed method can be used for any number of submodules and any levels. The validity of the proposed method is verified by experimental results of five-level prototype of MMC.

Key words： Modular multilevel converter(MMC) hysteresis-band current tracking control frequency of the current ripple loop mapping relationships voltage balancing control

收稿日期: 2013-09-09 出版日期: 2015-04-13

PACS:

TM46

基金资助:教育部博导类博士点基金资助项目（20130092110041）

作者简介: 吉宇男,1987年生,东南大学电气工程学院博士研究生,研究方向为电力电子技术在电力系统中应用、多电平控制技术。梅军男,1971年生,副教授,研究方向为电力电子技术在电力系统中应用、电能质量、光伏发电和数字化变电站等。

引用本文:

吉宇,梅军,杜晓舟,韩少华,郑建勇. 基于模块化多电平变换器的电流滞环跟踪型并网控制策略[J]. 电工技术学报, 2015, 30(4): 26-34. Ji Yu,Mei Jun,Du Xiaozhou,Han Shaohua,Zheng Jianyong. Hysteresis-Band Current Tracking Control Strategy to Connect Modular Multilevel Converter with Power Grid. Transactions of China Electrotechnical Society, 2015, 30(4): 26-34.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2015/V30/I4/26

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