电力电子变压器优化运行控制策略
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摘要
针对应用于交直流配电网的电力电子变压器(power electronic transformer, PET),分析了输入级MMC子模块电容电压波动的机理,结合电力电子变压器的特殊结构,提出了一种优化运行控制策略,通过在DC/DC变换器的控制环节上增加电流修正量,以减小输入级MMC子模块电容电压波动。利用Matlab建立了电力电子变压器的仿真模型,通过仿真验证了控制策略的有效性。
For the power electronic transformer(PET) applied to the AC/DC distribution network, the mechanism of capacitor voltage fluctuation of sub-module is analyzed. Combined with the special structure of PET, an optimal operation control strategy is proposed. The capacitor voltage fluctuation of submodule can be reduced by adding current correction to the control section of DC/DC converter. The AC/DC distribution network simulation system with PET is built and the effectiveness of the control strategy is verified.
For the power electronic transformer(PET) applied to the AC/DC distribution network, the mechanism of capacitor voltage fluctuation of sub-module is analyzed. Combined with the special structure of PET, an optimal operation control strategy is proposed. The capacitor voltage fluctuation of submodule can be reduced by adding current correction to the control section of DC/DC converter. The AC/DC distribution network simulation system with PET is built and the effectiveness of the control strategy is verified.
引文
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[17]赵昕,赵成勇,李广凯,等.采用载波移相技术的模块化多电平换流器电容电压平衡控制[J].中国电机工程学报,2011,31(21):48-55.Zhao Xin,Zhao Chengyong,Li Guangkai,et al.Submodule capacitance voltage balancing of modular multilevel converter based on carrier phase shifted SPWM technique[J].Proceedings of the CSEE,2011,31(21):48-55(in Chinese).
[18]杨晓峰,郑琼林.基于MMC环流模型的通用环流抑制策略[J].中国电机工程学报,2012,32(18):59-65.Yang Xiaofeng,Zheng Qionglin.A novel universal circulating current suppressing strategy based on the MMC circulating current model[J].Proceeding of the CSEE,2012,32(18):59-65(in Chinese).
[19]岳雨霏,徐千鸣,马伏军,等.基于子模块电压波动估计的MMC双环二倍频环流抑制策略[J].电工技术学报,2017,32(10):20-32.Yue Yufei,Xu Qianming,Ma Fujun.Dual-loop 2nd circulating current strategy based on estimated capacitor voltage fluctuation of sub-module for modular[J].Transactions of China Electrotechnical Society,2017,32(10):20-32(in Chinese).
[2]A.Lesnicar,R.Marquardt.An innovative modular multilevel converter topology suitable for a wide power range[C].Power Tech Conference Proceedings,2003 IEEE Bologna,pp.6 Vol.3,2003.
[3]M.Glinka,R.Marquardt.A new AC/AC-multilevel converter family applied to a single-phase converter[C].The Fifth International Conference on Power Electronics and Drive Systems(PEDS),pp.16-23 Vol.1,2003.
[4]Z.Wang,Z.Zhang,J.Zhang,et al.Power electronic transformer for dc power distribution network[C].2014International Electronics and Application Conference and Exposition(PEAC),2014:805-810.
[5]A.K.Sahoo,N.Mohan.High frequency link multi-winding power electronic transformer using modular multilevel converter for renewable energy integration[C].Industrial Electronics Society,IECON 2014-40th Annual Conference of the IEEE,Dallas,TX,2014:4642-4648.
[6]S.Kenzelmann,A.Rufer,D.Dujic,et al.Isolated DC/DCstructure based on modular multilevel converter[J].IEEETransactions on Power Electronics,2015,30(1):89-98.
[7]廖国虎,邱国跃,袁旭峰.电力电子变压器研究综述[J].电测与仪表,2014,51(16):5-10,36.Liao Guohu,Qiu Guoyue,Yuan Xufeng.Summary of the power electronic transformer research[J].Electrical Measurement&Instrumentation,2014,51(16):5-10,36(in Chinese).
[8]王杉杉,王玉斌,林意斐,等.级联型电力电子变压器电压与功率均衡控制方法[J].电工技术学报,2016,31(22):92-99.Wang Shanshan,Wang Yubin,Lin Yifei,et al.Voltage and power balance control for cascaded multilevel converter based power electronic transformer[J].Transactions of China Electrotechnical Society,2016,31(22):92-99(in Chinese).
[9]李响,郝瑞祥,游小杰,等.一种级联电力电子变压器直流电压平衡控制策略[J].电工技术学报,2017,32(2):238-245.Li Xiang,Hao Ruixiang,You Xiaojie,et al.A DC voltage balance control strategy for the cascaded power electronic transformer[J].Transactions of China Electrotechnical Society,2017,32(2):238-245(in Chinese).
[10]李子欣,王平,楚遵方,等.面向中高压智能配电网的电力电子变压器研究[J].电网技术,2013,37(9):2592-2601.Li Zixin,Wang Ping,Chu Zunfang,et al.Research on medium-and high-voltage smart distribution grid oriented power electronic transformer[J].Power System Technology,2013,37(9):2592-2601(in Chinese).
[11]孙广星,苟锐锋,孙伟.基于MMC结构的电力电子变压器拓扑结构及控制策略研究[J].高压电器,2016,52(1):142-147,153.Sun Guangxing,Gou Ruifeng,Sun Wei.Research on topology structure and control strategy of power electronic transformer based on MMC structure[J].High Voltage Electrical Appliance,2016,52(1):142-147,153(in Chinese).
[12]王轩,付永生,晋湾湾,等.一种新型结构的电力电子变压器[J].电工电能新技术,2017,36(5):67-74.Wang Xuan,Fu Yongsheng,Jin Wanwan,et al.Novel topology of power electronic transformer[J].Advanced Technology of Electrical Engineering and Energy,2017,36(5):67-74(in Chinese).
[13]李金科,金新民,吴学智,等.模块化多电平变流器模块电压纹波抑制策略及应用[J].中国电机工程学报,2016,36(7):1892-1899.Li Jinke,Jin Xinmin,Wu Xuezhi,et al.Voltage ripple suppression strategy and application of modular multilevel converters[J].Proceedings of the CSEE,2016,36(7):1892-1899(in Chinese).
[14]周月宾,江道灼,郭捷,等.模块化多电平换流器子模块电容电压波动与内部环流分析[J].中国电机工程学报,2012,32(24):8-14,4.Zhou Yuebin,Jiang Daozhuo,Guo Jie,et al.Analysis of submodule capacitor voltage ripples and circulating currents in modular multilevel converters[J].Proceedings of the CSEE,2012,32(24):8-14,4(in Chinese).
[15]Picas R,Pou J,Ceballos S,et al.Minimization of the capacitor voltage fluctuations of a modular multilevel converter by circulating current control[C].38th Annual Conference on IEEE Industrial Electronics Society.Montrea,Canada,2012:4985-4991.
[16]Korn A J,Winkelnkemper M,Steimer P.Low output frequency operation of the modular multi-level converter[C].IEEEEnergy Conversion Congress and Exposition(ECCE).Atlanta,USA,2010:3993-3997.
[17]赵昕,赵成勇,李广凯,等.采用载波移相技术的模块化多电平换流器电容电压平衡控制[J].中国电机工程学报,2011,31(21):48-55.Zhao Xin,Zhao Chengyong,Li Guangkai,et al.Submodule capacitance voltage balancing of modular multilevel converter based on carrier phase shifted SPWM technique[J].Proceedings of the CSEE,2011,31(21):48-55(in Chinese).
[18]杨晓峰,郑琼林.基于MMC环流模型的通用环流抑制策略[J].中国电机工程学报,2012,32(18):59-65.Yang Xiaofeng,Zheng Qionglin.A novel universal circulating current suppressing strategy based on the MMC circulating current model[J].Proceeding of the CSEE,2012,32(18):59-65(in Chinese).
[19]岳雨霏,徐千鸣,马伏军,等.基于子模块电压波动估计的MMC双环二倍频环流抑制策略[J].电工技术学报,2017,32(10):20-32.Yue Yufei,Xu Qianming,Ma Fujun.Dual-loop 2nd circulating current strategy based on estimated capacitor voltage fluctuation of sub-module for modular[J].Transactions of China Electrotechnical Society,2017,32(10):20-32(in Chinese).