超级电容器储能逆变器控制策略研究
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摘要
为了对储能逆变器在不平衡与非线性负载时的输出电压的谐波进行抑制,本文针对双级式逆变器拓扑建立数学模型,基于模型分析了直流电容中点电压波动对逆变器输出的影响,以及不平衡输出电流和谐波电流对直流电容中点电压影响的机理,进而提出了该拓扑逆变器在不平衡和非线性负载情况下抑制交流输出电压不平衡和零序谐波的抑制策略。最后建立了MATLAB仿真模型对该控制策略进行了理论验证,并在80 kW样机上进行了实验验证,仿真和实验结果都表明了该控制策略的有效性。
The mathematical model for the dual-stage converter topology is established. First,the influence of neutral-point voltage fluctuation of DC capacitor on the output of the converter is analyzed based on this model. Then the influence mechanism of unbalanced output current and harmonic current on DC capacitor neutral-point voltage is studied. Furthermore, the suppression control strategy of AC output voltage unbalance and zero-sequence harmonic under unbalanced and non-linear loads is proposed. Finally, a simulation model of MATLAB and a 80 kW experimental prototype are established to validate the control strategy theoretically. The simulation and experimental results proof the effectiveness of the control strategy.
The mathematical model for the dual-stage converter topology is established. First,the influence of neutral-point voltage fluctuation of DC capacitor on the output of the converter is analyzed based on this model. Then the influence mechanism of unbalanced output current and harmonic current on DC capacitor neutral-point voltage is studied. Furthermore, the suppression control strategy of AC output voltage unbalance and zero-sequence harmonic under unbalanced and non-linear loads is proposed. Finally, a simulation model of MATLAB and a 80 kW experimental prototype are established to validate the control strategy theoretically. The simulation and experimental results proof the effectiveness of the control strategy.
引文
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[2]陈玲,张兴,杨淑英,等.带不平衡负载的三相四桥臂逆变器的研究[J].合肥工业大学学报,2009,32(4):486-490.CHEN Ling,ZHANG Xing,YANG Shuying,et al.Study on the threephase four-leg inverter with unbalanced loads[J].Journal of Hefei University of Technology,2009,32(4):486-490.
[3]阮新波,严仰光.四桥臂三相逆变器的控制策略[J].电工技术学报,2000,15(1):61-64.RUAN Xinbo,YANG Yangguang.The control strategy for threephase inverter with four bridge legs[J].Transactions of China Electrotechnical Society,2000,15(1):61-64.
[4]胡文华,马伟明,刘春喜.一种新的不平衡控制策略的研究[J].电工技术学报,2009,39(10):3-7.HU Wenhua,MA Weiming,LIU Chunxi.Research on a novel control strategy for unbalanced load[J].Electric Drive,2009,39(10):3-7.
[5]KIM K H,PARK N J,HYUN D S.Advanced synchronous reference frame controller for three-phase ups powering unbalanced and nonlinear loads[C]//Power Electronics Specialists Conference,2005.
[6]白丹,蔡志开,彭力,等.三相逆变电源不平衡负载研究[J].电力系统自动化,2004,28(9):53-57.BAI Dan,CAI Zhikai,PENG Li,et al.Study on the unbalanced load of a three-phase inverter[J].Automation of Electric Power System,2004,28(9):53-57.
[7]许泽富,唐芬,周家宇,等.不平衡负载工况下三相变流器有源功率解耦控制[J].电网技术,2019,43(3):1056-1065.XU Zefu,TANG Fen,ZHOU Jiayu,et al.Active power decoupling control of three-phase converter with unbalanced load[J].Power System Technology,2019,43(3):1056-1065.
[8]TANG F,ZHOU J Y,XIN Z,et al.An improved three-phase voltage source converter with high-performance operation under unbalanced conditions[J].IEEE Access,2018,6(1):15908-15918.
[9]QI W L,WANG H,TAN X G,et al.An novel active power decoupling single-phase PWM rectifier topology[C]//IEEE Applied Power Electronics Conference and Exposition,TX USA,2014.