低频工况下MMC电容电压波动抑制研究
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摘要
以MMC的动态模型为出发点,分析了子模块电压波动与MMC交流侧频率、交流侧输出电流幅值关系,提出了一种低频工况下MMC电容电压波动抑制控制策略。该控制策略通过在MMC交流侧注入方波共模电压分量和正弦环流分量对电容电压波动进行抑制,注入的环流分量由共模频率分量和共模三次谐波分量组成。仿真表明,该控制策略不仅能有效抑制子模块电容电压的波动,改善MMC输出电压的波形,而且能够使系统稳定运行。
To deal with the significant voltage fluctuation under low frequency conditions,analysis is made based on the power in the upper and lower arms,the relationship between the capacitor voltage fluctuation and the amplitude of the circular current,the frequency of ac-side.A control strategy based on injection of a square-wave common-mode voltage at the ac-side and a circulating current within the phase-legs to attenuate the low-frequency components of the SM capacitor voltage is proposed.The frequency spectrum consists of components in the vicinity of the common-mode frequency and third harmonic of the common-mode frequency.The simulation results show that this method can effectively suppress the ripple of the capacitor voltage and enhance the quality of the output voltage.
To deal with the significant voltage fluctuation under low frequency conditions,analysis is made based on the power in the upper and lower arms,the relationship between the capacitor voltage fluctuation and the amplitude of the circular current,the frequency of ac-side.A control strategy based on injection of a square-wave common-mode voltage at the ac-side and a circulating current within the phase-legs to attenuate the low-frequency components of the SM capacitor voltage is proposed.The frequency spectrum consists of components in the vicinity of the common-mode frequency and third harmonic of the common-mode frequency.The simulation results show that this method can effectively suppress the ripple of the capacitor voltage and enhance the quality of the output voltage.
引文
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[3]张犁,孙凯,冯兰兰.一种模块化光伏发电并网系统[J].中国电机工程学报,2011,31(1):26-31.Zhang L,Sun K,Feng L L.A modular grid-connected photovoltaic generation system[J].Proceedings of the CSEE,2011,31(1):26-31.
[4]刘建涛,王治华,王珂.不同结构电压源换流器损耗对比分析[J].电力系统保护与控制,2013,41(6):105-110.Liu J T,Wang Z H,Wang K.Comparative analysis of losses of voltage source converters with different structures[J].Power System Protection and Control,2013,41(6):105-110.
[5]王辉,张宁敏.模块化多电平逆变器的改进型PS-SPWM研究[J].控制工程,2014,21(6):797-801.Wang H,Zhang L M.Research of PS-SPWM on modular multilevel converter[J].Control Engineering of China,2014,21(6):797-801.
[6]高建,苏建徽,高航.模块化多电平换流器电容电压与环流的控制策略[J].电力系统保护与控制,2014,42(3):56-62.Gao J,Su J H,Gao H.Capacitor voltage and circulation current control strategy in modular multilevel converter[J].Power System Protection and Control,2014,42(3):56-62.
[7]Hagiwara M,Nishimura K,Akagi H.A medium voltage motor drive with a modular multilevel PWM inverter[J].IEEE Transactions on Power Electronics,2010,25(7):1786-1799.
[8]刘国伟,姜齐荣,魏应冬.低频率工况下模块化多电平变流器电容电压平衡控制策略[J].电工技术学报,2014,29(8):166-172.Liu G W,Jiang Q R,Wei Y D.Study on capacitor voltage balancing control of modular multilevel converters at low frequency[J].Transactions of China Electrotechnical Society,2014,29(8):166-172.
[9]雷鸣,李耀华,葛琼璇,等.模块化多电平变流器低频控制方法[J].中国电机工程学报,2013,33(24):59-65.Lei M,Li Y H,Ge Q X,et al.Control scheme of multilevel modular converter operating at low frequency[J].Proceedings of the CSEE,2013,33(24):59-65.
[10]常乾坤,葛琼璇,雷鸣,等.模块化多电平变流器低频调速系统控制方法[J].电力系统自动化,2014,38(10):120-125.Chang Q K,Ge Q X,Lei M,et al.Control scheme of multilevel modular converter operating in low-speed control system[J].Automation of Electric Power Systems,2014,38(10):120-125.
[11]L.Harnefors,A.Antonopoulos,K.Ilves,H.-P.Nee.Global asymptotic stability of current-controlled modular multilevel converters[J],IEEE Transactions on Power Electronics,2015,30(1):249-258.
[12]S.Engel,R.De Doncker.Control of the Modular Multi-Level Converter for minimized cell capacitance[C].IEEE European Conference on Power Electronics and Applications.Birmingham,2011:1-10.
[13]A.Korn,M.Winkelnkemper,P.Steimer.Low output frequency operation of the Modular Multi-Level Converter[C].IEEE Energy Conversion Congress and Exposition.Atlanta,2010:3993–3997.
[14]A.Antonopoulos.Modular multilevel converter ac motor drives with constant torque from zero to nominal speed[J],IEEE Transactions on Industry Applications,2014,50(3):1982-1993.
[15]M.Spichartz,V.Staudt,A.Steimel.Analysis of the module-voltage fluctuations of the modular multilevel converter at variable speed drive applications[C],IEEE International Conference on Optimization of Electrical and Electronic Equipment.Brasov,2012:751-758
[16]J.Kolb,F.Kammerer,M.Gommeringer,M.Braun.Cascaded control system of the modular multilevel converter for feeding variable speed drives[J],IEEE Transactions on Power Electronics,2015,30(1):349-357.