模块化多电平变流器的低频控制策略

发布时间：2018-01-18 00:13

本文关键词：模块化多电平变流器的低频控制策略　出处：《高电压技术》2017年04期 　论文类型：期刊论文

【摘要】：为了研究模块化多电平(MMC)低频电容电压波动的问题,提出了一种MMC低频运行控制策略。首先,建立了MMC的数学模型,从能量流动的角度研究了MMC的电容电压波动情况,指出桥臂能量偏差与系统的运行频率呈反比,致使系统在低频下无法正常运行。针对这一问题,提出了一种在桥臂环流和输出电压中加入高频方波分量的方法来抑制电容电压的波动,确保MMC桥臂能量的平衡。理论分析结果表明,相比于加入高频正弦分量的方法,采用该方法得到的桥臂环流的峰值降低了50%。最后采用上述方法进行了阻感和电机实验,结果表明,模块电压波动得到了有效抑制,电机低频调速性能良好,证明了所提出的控制方法的有效性。
[Abstract]:In order to study the voltage fluctuation of modularized multilevel MMC low frequency capacitance, a low frequency operation control strategy of MMC is proposed. Firstly, the mathematical model of MMC is established. The capacitance voltage fluctuation of MMC is studied from the point of view of energy flow. It is pointed out that the energy deviation of the bridge arm is inversely proportional to the operating frequency of the system, which makes the system unable to operate normally at low frequency. A method of adding high-frequency square wave component to the circulation and output voltage of the bridge arm is proposed to suppress the fluctuation of capacitance voltage and to ensure the balance of the energy of the MMC arm. Compared with the method of adding high frequency sinusoidal component, the peak value of the bridge arm circulation obtained by this method is reduced by 50 parts. Finally, the resistive inductance and motor experiments are carried out using the above method, and the results show that. The module voltage fluctuation is effectively suppressed and the low frequency speed regulation performance of the motor is good, which proves the effectiveness of the proposed control method.
【作者单位】：北京电力经济技术研究院;中国科学院电工研究所;
【基金】：国家高科技研究发展计划(863计划)(2014AA052602)~~
【分类号】：TM46
【正文快照】： 0引言12002年,德国学者提出了模块化多电平变流器(MMC)的拓扑,并分析了其基本工作原理[1-2]。MMC拓扑具有高度模块化的结构特点,同时以其不需要多抽头输入变压器、输出多电平且具有公共直流母线、能够组成背靠背四象限运行等优点,得到了广大专家学者的热捧,被称作是下一代的多

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