模块化多电平变换器基于钳位和能量转移电路的可直通子模块拓扑
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摘要
为提高模块化多电平变换器(MMC)的可靠性,提出一种具有上下开关管直通能力的子模块拓扑结构,该拓扑结构由半桥电路、钳位电路和能量转移电路三部分组成。钳位电路保证了子模块电压的稳定输出,能量转移电路保证了子模块电容的充放电平衡。该拓扑结构不仅允许上下开关管直通,而且不需要电容电压平衡控制策略,具有自平衡能力,简化了系统的结构和软件计算量,提高了可靠性。介绍子模块电路构成、工作原理及控制方法。基于五电平单相实验平台验证所提出的基于子模块拓扑结构的MMC不仅可容许子模块桥臂直通,而且无需采用环流抑制措施即可实现低交流环流运行。
To improve the reliability of the modular multilevel converters(MMC),a new submodule(SM) topology with shoot-through ability is proposed,which is composed of the clamping circuit,energy transfer circuit and half-bridge circuit.The clamping circuit ensures the stability of the SM voltage,and the energy transfer circuit guarantees the energy balance flowing into and out the SM.The new topology not only has the shoot-through ability and the self-balancing ability,but also does not require a capacitor voltage balance control strategy.It greatly improves the reliability,simplifies the system structure,and reduces the calculation.The circuit topology,operation principle and control method of the novel SM are presented.Based on a five-level single-phase MMC prototype,the feasibility of the proposed SM topology is verified.It has been demonstrated that some SMs are shoot-through and the AC circulate current is small without suppression strategy.
To improve the reliability of the modular multilevel converters(MMC),a new submodule(SM) topology with shoot-through ability is proposed,which is composed of the clamping circuit,energy transfer circuit and half-bridge circuit.The clamping circuit ensures the stability of the SM voltage,and the energy transfer circuit guarantees the energy balance flowing into and out the SM.The new topology not only has the shoot-through ability and the self-balancing ability,but also does not require a capacitor voltage balance control strategy.It greatly improves the reliability,simplifies the system structure,and reduces the calculation.The circuit topology,operation principle and control method of the novel SM are presented.Based on a five-level single-phase MMC prototype,the feasibility of the proposed SM topology is verified.It has been demonstrated that some SMs are shoot-through and the AC circulate current is small without suppression strategy.
引文
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[16]Liu Y,Ge B,Abu-Rub H,et al.An effective control method for quasi-Z-source cascade multilevel inverter-based grid-tie single-phase photovoltaic power system[J].IEEE Transactions on Industrial Informatics,2013,10(1):399-407.
[17]Mei Jun,Shen Ke,Xiao Bailu,et al.A new selective loop bias mapping phase disposition PWM with dynamic voltage balance capability for modular multilevel converter[J].IEEE Transactions on Industrial Electronics,2013,61(2):798-807.
[18]Sun Z,Li Y H,Wang P,et al.Parameter design principle of the capacitors and inductors in the power electronic transformer based on MMC[C]//International Conference on Electrical Machines and Systems,Hangzhou,China,2015:2445-2448
[2]杨晓峰,林智钦,郑琼林,等.模块组合多电平变换器的研究综述[J].中国电机工程学报,2013,33(6):1-14.Yang Xiaofeng,Lin Zhiqin,Zheng Qionglin,et al.Areview of modular multilevel converters[J].Proceedings of the CSEE,2013,33(6):1-14.
[3]李楠,高峰.电池储能型模块化多电平变换器的混合模型预测控制方法[J].电工技术学报,2017,32(14):165-174.Li Nan,Gao Feng.A hybrid model predictive control method for modular multilevel converter of battery energy storage system[J].Transactions of China Electrotechnical Society,2017,32(14):165-174.
[4]徐殿国,李彬彬,周少泽.模块化多电平高压变频技术研究综述[J].电工技术学报,2017,32(20):104-116.Xu Dianguo,Li Binbin,Zhou Shaoze.Overview of the modular multilevel converter based high voltage motor drive[J].Transactions of China Electrotechnical Society,2017,32(20):104-116.
[5]Hagiwara M,Akagi H.Control and experiment of pulse width-modulated modular multilevel converters[J].IEEE Transactions on Power Electronics,2009,24(7):1737-1746.
[6]付艳,黄金海,吴庆范,等.基于MMC多端柔性直流输电保护关键技术研究[J].电力系统保护与控制,2016,44(18):133-139.Fu Yan,Huang Jinhai,Wu Qingfan,et al.Key technologies research based on multi-terminal MMC-HVDC protection[J].Power System Protection and Control,2016,44(18):133-139.
[7]殷实,谭国俊,方磊,等.模块化多电平变流器调速系统变频控制[J].电工技术学报,2016,31(20):140-150.Yin Shi,Tan Guojun,Fang Lei,et al.Variable frequency control strategy of modular multilevel converter[J].Transactions of China Electrotechnical Society,2016,31(20):140-150.
[8]代高富,符金伟,周胜,等.基于模型预测控制的MMC-HVDC系统控制策略研究[J].电力系统保护与控制,2016,44(10):10-16.Dai Gaofu,Fu Jinwei,Zhou Sheng,et al.Study of control strategy for MMC-HVDC system based on model predictive control[J].Power System Protection and Control,2016,44(10):10-16.
[9]谢志德,杨明发.基于混合旁路MMC-HVDC直流故障隔离技术研究[J].电气技术,2017,18(11):39-43.Xie Zhide,Yang Mingfa.Reserch on the DC fault isolating techique base on hybrid bypass in MMC-HVDC[J].Electrical Engineering,2017,18(11):39-43.
[10]李凯,赵争鸣,袁立强,等.基于能量平衡的降低模块化多电平变换器子模块电容电压波动控制策略[J].电工技术学报,2017,32(14):17-26.Li Kai,Zhao Zhengming,Yuan Liqiang,et al.Control strategy based on the energy balance for reducing sub-module capacitor voltage fluctuation of modular multilevel converter[J].Transactions of China Electrotechnical Society,2017,32(14):17-26.
[11]王泽,张凯,陈济民,等应用于模块化多电平变频器的电容电压脉动抑制技术综述[J].电工技术学报,2018,33(16):3756-3771.Wang Ze,Zhang Kai,Chen Jimin,et al.A summary of capacitor voltage ripple suppression techniques applied to modular multilevel converters for ACmotor drives[J].Transactions of China Electrotechnical Society,2018,33(16):3756-3771.
[12]Peng F Z.Z-source inverter[J].IEEE Transactions on Industry Applications,2003,39(2):504-510.
[13]Abdelhakim A,Davari P,Blaabjerg F,et al.Switching loss reduction in the three-phase quasiZ-source inverters utilizing modified space vector modulation strategies[J].IEEE Transactions on Power Electronics,2018,33(5):4045-4060.
[14]Adda R,Ray O,Mishra S K,et al.Synchronousreference-frame-based control of switched Boost inverter for standalone DC nanogrid applications[J].IEEE Transactions on Power Electronics,2013,28(3):1219-1233.
[15]Ge B,Liu Y,Abu-Rub H,et al.State-of-charge balancing control for battery energy stored quasi-Zsource cascaded multilevel inverter based photovoltaic power system[J].IEEE Transactions on Industrial Electronics,2018,65(3):2263-2279.
[16]Liu Y,Ge B,Abu-Rub H,et al.An effective control method for quasi-Z-source cascade multilevel inverter-based grid-tie single-phase photovoltaic power system[J].IEEE Transactions on Industrial Informatics,2013,10(1):399-407.
[17]Mei Jun,Shen Ke,Xiao Bailu,et al.A new selective loop bias mapping phase disposition PWM with dynamic voltage balance capability for modular multilevel converter[J].IEEE Transactions on Industrial Electronics,2013,61(2):798-807.
[18]Sun Z,Li Y H,Wang P,et al.Parameter design principle of the capacitors and inductors in the power electronic transformer based on MMC[C]//International Conference on Electrical Machines and Systems,Hangzhou,China,2015:2445-2448