本文關鍵詞：模塊化多電平變流器的低頻控制策略　出處：《高電壓技術(shù)》2017年04期 　論文類型：期刊論文

  更多相關文章： 模塊化多電平 低頻運行 共模電流 橋臂電流解耦控制 能量平衡 方波分量

【摘要】：為了研究模塊化多電平(MMC)低頻電容電壓波動的問題,提出了一種MMC低頻運行控制策略。首先,建立了MMC的數(shù)學模型,從能量流動的角度研究了MMC的電容電壓波動情況,指出橋臂能量偏差與系統(tǒng)的運行頻率呈反比,致使系統(tǒng)在低頻下無法正常運行。針對這一問題,提出了一種在橋臂環(huán)流和輸出電壓中加入高頻方波分量的方法來抑制電容電壓的波動,確保MMC橋臂能量的平衡。理論分析結(jié)果表明,相比于加入高頻正弦分量的方法,采用該方法得到的橋臂環(huán)流的峰值降低了50%。最后采用上述方法進行了阻感和電機實驗,結(jié)果表明,模塊電壓波動得到了有效抑制,電機低頻調(diào)速性能良好,證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.
【作者單位】： 北京電力經(jīng)濟技術(shù)研究院;中國科學院電工研究所;
【基金】：國家高科技研究發(fā)展計劃(863計劃)(2014AA052602)~~
【分類號】：TM46
【正文快照】： 0引言12002年,德國學者提出了模塊化多電平變流器(MMC)的拓撲,并分析了其基本工作原理[1-2]。MMC拓撲具有高度模塊化的結(jié)構(gòu)特點,同時以其不需要多抽頭輸入變壓器、輸出多電平且具有公共直流母線、能夠組成背靠背四象限運行等優(yōu)點,得到了廣大專家學者的熱捧,被稱作是下一代的多

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