级联型电力电子变压器直流电压二次纹波抑制策略
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摘要
直流纹波电压的存在将影响电力电子变压器(PET)的可靠性,制约其体积的优化与能量密度的提升。针对这一问题,提出一种PET直流电压纹波抑制策略。首先,分析PET的拓扑结构与控制策略,从能量传输角度分析PET直流纹波电压的产生机理,提出基于纹波功率传递通路构建的直流纹波电压抑制策略;然后,对所提控制策略进行建模分析,并通过线性拟合的方法对控制系统的非线性环节进行解耦,实现控制系统中直流环节与交流环节性能的独立分析;最后,仿真与实验验证了理论分析的正确性与所提控制策略的有效性。
For cascaded power electronic transformer, ripple voltage in the dc side will affect the reliability and restrict the optimization of volume and energy density. To suppress and control the ripple voltage, a novel control strategy is proposed in this paper. Firstly, the topology and control strategy of cascaded PET are described briefly. From the perspective of the dc ripple voltage generating mechanism, the ripple voltage suppression strategy with a ripple power transmission channel is proposed for PET. Then, the model of the proposed control strategy is built. The nonlinear link of the model is decoupled by a linear fitting method to analyze the control performance of the DC loop and AC loop. Simulation and experiment results have verified the proposed control strategy.
For cascaded power electronic transformer, ripple voltage in the dc side will affect the reliability and restrict the optimization of volume and energy density. To suppress and control the ripple voltage, a novel control strategy is proposed in this paper. Firstly, the topology and control strategy of cascaded PET are described briefly. From the perspective of the dc ripple voltage generating mechanism, the ripple voltage suppression strategy with a ripple power transmission channel is proposed for PET. Then, the model of the proposed control strategy is built. The nonlinear link of the model is decoupled by a linear fitting method to analyze the control performance of the DC loop and AC loop. Simulation and experiment results have verified the proposed control strategy.
引文
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[17]丁明,陈中,程旭东.级联储能变换器直流链纹波电流的抑制策略[J].电工技术学报,2014,29(2):46-54.Ding Ming,Chen Zhong,Chen Xudong.A scheme for suppressing DC ripple current of cascade converter for energy storage system[J].Transactions of China Electrotechnical Society,2014,29(2):46-54.
[18]黄守道,张阳,罗德荣.Z源逆变器在风电并网系统中的电容电压纹波抑制策略[J].电工技术学报,2015,30(增刊2):135-142.Huang Shoudao,Zhang Yang,Luo Derong.Ripple suppression for the capacitor voltage of the Z-source grid-connected wind generation system[J].Transactions of China Electrotechnical Society,201530(S2):135-142.
[19]高航,苏建徽,汪晶晶,等.模块化多电平型换流器电容电压二倍频波动抑制策略研究[J].电力系统保护与控制,2014,42(6):116-122.Gao Hang,Su Jianhui,Wang Jingjing,et al.Study on control strategy for suppressing double fundamental frequency fluctuation of capacitor voltage of modular multilevel converter[J].Power System Protection and Control,2014,42(6):116-122.
[20]殷晓东,罗登,李祖勇,等.一种双向隔离DC-DC变换器二次纹波电压抑制方法[J].电工技术学报,2018,33(7):1-8.Yin Xiaodong,Luo Deng,Li Zuyong,et al.Asecond-order ripple voltage suppression algorithm of bidirectional isolation DC-DC converter[J].Transactions of China Electrotechnical Society,2018,33(7):1-8.
[21]Zhao Tiefu,She Xu,Bhattacharya S,et al.Power synchronization control for capacitor minimization in solid state transformers(SST)[C]//Energy Conversion Congress and Exposition,Phoenix,AZ,2011:2812-2818.
[22]Qin H,Kimball J W.Closed-loop control of DC-DCdual-active-bridge converters driving single-phase inverters[J].IEEE Transactions on Power Electronics2014,29(2):1006-1017.
[23]Gohil G,Wang H,Liserre M,et al.Reduction of DC-link capacitor in case of cascade multilevel converters by means of reactive power control[C]//Applied Power Electronics Conference and Exposition,Fort Worth,TX,2014:231-238
[2]王婷,王广柱,张勋.基于模块化多电平矩阵变换器的电力电子变压器控制策略[J].电工技术学报,2016,31(18):108-115.Wang Ting,Wang Guangzhu,Zhang Xun.The control strategy of power electronic transformer based on modular multilevel matrix converters[J].Transactions on Industrial Electronics,2016,31(18):108-115.
[3]Wang D,Tian J,Mao C,et al.A 10kV/400V 500kVAelectronic power transformer[J].IEEE Transactions on Industrial Electronics,2016,63(11):6653-6663.
[4]兰征,涂春鸣,肖凡,等.电力电子变压器对交直流混合微网功率控制的研究[J].电工技术学报,2015,30(23):50-57.Lan Zheng,Tu Chunming,Xiao Fan,et al.The power control of power electronic transformer in hybrid AC-DC microgrid[J].Transactions of China Electrotechnical Society,2015,30(23):50-57.
[5]卢子广,赵刚,杨达亮,等.配电网电力电子变压器技术综述[J].电力系统及其自动化学报,2016,28(5):48-54.Lu Ziguang,Zhao Gang,Yang Daliang,et al.Overview of research on power electronic transformer in distribution network[J].Proceedings of the CSU-EPSA,2016,28(5):48-54.
[6]张祥龙,周晖,肖智宏,等.电力电子变压器在有源配电网无功优化中的应用[J].电力系统保护与控制,2017,45(4):80-85.Zhang Xianglong,Zhou Hui,Xiao Zhihong,et al.Power electronic transformer applied to optimization of reactive power in active distribution system[J].Power System Protection and Control,2017,45(4):80-85.
[7]Feng Jianghua,Chu W Q,Zhang Zhixue,et al.Power electronic transformer based railway traction systems:challenges and opportunities[J].IEEE Journal of Emerging&Selected Topics in Power Electronics,2017,5(3):1237-1253.
[8]Zhao Tiefu,Wang Guangyao,Bhattacharya S,et al.Voltage and power balance control for a cascaded H-bridge converter-based solid-state transformer[J].IEEE Transactions on Power Electronics,2013,28(4):1523-1532.
[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 DCvoltage balance control strategy for the cascaded power electronic transformer[J].Transactions of China Electrotechnical Society,2017,32(2):238-245.
[10]Se Xu,Huang A Q,Wang Guangyao,et al.A new voltage-balancing controller in cascaded multilevel converters[C]//Energy Conversion Congress and Exposition,Phoenix,AZ,2011:177-184.
[11]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.
[12]Liu Jianqiang,Yang Jingxi,Zhang Jiepin,et al.Voltage balance control based on dual active bridge DC/DC converters in a power electronic traction transformer[J].IEEE Transactions on Power Electronics,2018,33(2):1696-1714.
[13]Chen Qifang,Liu Nian,Hu Cungang,et al.Autonomous energy management strategy for solid-state transformer to integrate PV-assisted EV charging station participating in ancillary service[J].IEEETransactions on Industrial Informatics,2017,13(1):258-269.
[14]García P,Saeed S,Navarro Rodríguezá,et al.Switching frequency optimization for a solid state transformer with energy storage capabilities[C]//2016IEEE Energy Conversion Congress and Exposition(ECCE),Milwaukee,WI,USA,2016:1-8.
[15]Wang R,Wang F,Boroyevich D,et al.A high power density single-phase PWM rectifier with active ripple energy storage[J].IEEE Transactions on Power Electronics,2011,26(5):1430-1443.
[16]李红波,张軋,赵晖,等.高功率密度单相变换器的直流有源滤波器研究[J].中国电机工程学报,2012,32(15):40-47.Li Hongbo,Zhang Kai,Zhao Hui,et al.Researches on DC active power filters for high power density single phase converters[J].Proceedings of the CSEE2012,32(15):40-47.
[17]丁明,陈中,程旭东.级联储能变换器直流链纹波电流的抑制策略[J].电工技术学报,2014,29(2):46-54.Ding Ming,Chen Zhong,Chen Xudong.A scheme for suppressing DC ripple current of cascade converter for energy storage system[J].Transactions of China Electrotechnical Society,2014,29(2):46-54.
[18]黄守道,张阳,罗德荣.Z源逆变器在风电并网系统中的电容电压纹波抑制策略[J].电工技术学报,2015,30(增刊2):135-142.Huang Shoudao,Zhang Yang,Luo Derong.Ripple suppression for the capacitor voltage of the Z-source grid-connected wind generation system[J].Transactions of China Electrotechnical Society,201530(S2):135-142.
[19]高航,苏建徽,汪晶晶,等.模块化多电平型换流器电容电压二倍频波动抑制策略研究[J].电力系统保护与控制,2014,42(6):116-122.Gao Hang,Su Jianhui,Wang Jingjing,et al.Study on control strategy for suppressing double fundamental frequency fluctuation of capacitor voltage of modular multilevel converter[J].Power System Protection and Control,2014,42(6):116-122.
[20]殷晓东,罗登,李祖勇,等.一种双向隔离DC-DC变换器二次纹波电压抑制方法[J].电工技术学报,2018,33(7):1-8.Yin Xiaodong,Luo Deng,Li Zuyong,et al.Asecond-order ripple voltage suppression algorithm of bidirectional isolation DC-DC converter[J].Transactions of China Electrotechnical Society,2018,33(7):1-8.
[21]Zhao Tiefu,She Xu,Bhattacharya S,et al.Power synchronization control for capacitor minimization in solid state transformers(SST)[C]//Energy Conversion Congress and Exposition,Phoenix,AZ,2011:2812-2818.
[22]Qin H,Kimball J W.Closed-loop control of DC-DCdual-active-bridge converters driving single-phase inverters[J].IEEE Transactions on Power Electronics2014,29(2):1006-1017.
[23]Gohil G,Wang H,Liserre M,et al.Reduction of DC-link capacitor in case of cascade multilevel converters by means of reactive power control[C]//Applied Power Electronics Conference and Exposition,Fort Worth,TX,2014:231-238