三端口DC/DC变换器预测电流移相控制
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摘要
针对微电网储能系统中三端口DC/DC变换器,研究了基于半开关周期采样和全开关周期采样的预测电流移相控制。分析了变换器的工作状态和开关模态,采用Y-△等效变换得到电感电流斜率,在每个开关周期驱动信号的中点时刻采样电感电流,计算不同阶段变换器的电感电流增量。基于电流采样值和电流参考值预测变换器下一个开关周期上升沿和下降沿移相比,更新该移相比使电感电流达到参考值。然后分析了两种采样模式下电感电流中直流分量消除机理,并给出三端口DC/DC变换器闭环控制策略。仿真结果验证了该控制方法的有效性,较好地解决了三端口DC/DC变换器直流偏置问题,提高了系统的动态响应和鲁棒性能。
For the three-port DC/DC converter in the microgrid energy storage system, the predictive current phase shift control based on half switching cycle sampling and full switching cycle sampling is studied. The working state and switching mode of the converter are analyzed. The slope of the inductor current is obtained by Y-△ equivalent transformation. The inductor current is sampled at the midpoint of the driving signal of each switching cycle, and the inductor current increment of the converter at different stages is calculated. Based on the current sampling value and the current reference value, the phase shift ratios of rising edge and falling edge for the next switching cycle of the converter are predicted. By updating the phase shift ratios, the inductor current can reach the reference value. Then the elimination mechanism of DC component in the inductor current in two sampling modes is analyzed, and the closed-loop control strategy of three-port DC/DC converter is given. The simulation results verify the effectiveness of the proposed control method and solve the DC bias problem of the three-port DC/DC converter, which improves the dynamic response and robust performance of the system.
For the three-port DC/DC converter in the microgrid energy storage system, the predictive current phase shift control based on half switching cycle sampling and full switching cycle sampling is studied. The working state and switching mode of the converter are analyzed. The slope of the inductor current is obtained by Y-△ equivalent transformation. The inductor current is sampled at the midpoint of the driving signal of each switching cycle, and the inductor current increment of the converter at different stages is calculated. Based on the current sampling value and the current reference value, the phase shift ratios of rising edge and falling edge for the next switching cycle of the converter are predicted. By updating the phase shift ratios, the inductor current can reach the reference value. Then the elimination mechanism of DC component in the inductor current in two sampling modes is analyzed, and the closed-loop control strategy of three-port DC/DC converter is given. The simulation results verify the effectiveness of the proposed control method and solve the DC bias problem of the three-port DC/DC converter, which improves the dynamic response and robust performance of the system.
引文
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[17]宫金武,查晓明,王盼,等.大容量多端口变换器拓扑研究综述[J].电源学报,2017,15(5):1-9.GONG Jinwu,ZHA Xiaoming,WANG Pan,et al.Review of topology research on high-power multi ports converter[J].Journal of Power Supply,2017,15(5):1-9.
[18]谢军,张崇巍,刘胜永,等.用于新能源发电系统ZVS多端口DC/DC变流器[J].电力电子技术,2012,46(8):23-25.XIE Jun,ZHANG Chongwei,LIU Shengyong,et al.AZVS multi-port DC/DC converter for new energy electricity generation system[J].Power Electronics,2012,46(8):23-25.
[19]ZHAO C,ROUND S D,KOLAR J W.An isolated three-port bidirectional DC-DC converter with decoupled power flow management[J].IEEE Transactions on Power Electronics,2008,23(5):2443-2453.
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[21]宋鑫,肖建国,牛洁茹,等.一种用于新能源混合发电的移相控制三端口DC-DC变流器[J].电工技术学报,2015,30(17):36-44.SONG Xin,XIAO Jianguo,NIU Jieru,et al.A three-port DC-DC converter with phase shift control for the hybrid renewable energy generation system[J].Transactions of China Electrotechnical Society,2015,30(17):36-44.
[22]王政,储凯,张兵,等.移相占空比控制的三端口双向直流变换器[J].电机与控制学报,2015,19(7):81-87.WANG Zheng,CHU Kai,ZHANG Bing,et al Three-port bidirectional DC/DC converter with duty cycle and phase-shifting control[J].Electric Machines and Control,2015,19(7):81-87.
[23]HUANG J,WANG Y,LI Z,et al.Predictive valley-peak current control of isolated bidirectional dual active bridge DC-DC converter[C]//Energy Conversion Congress and Exposition,September 20-24,2015,Montreal,QC,Canada:1467-1472.
[24]DUTTA S,HAZRA S,BHATTACHARYA S.A digital predictive current-mode controller for a single-phase high-frequency transformer-isolated dual-active bridge DC-to-DC converter[J].IEEE Transactions on Industrial Electronics,2016,63(9):5943-5952.
[25]CHATTOPADHYAY R,ACHARYA S,GOHIL G,et al.One switching cycle current control strategy for triple active bridge phase-shifted DC-DC converter[C]//Industry Applications Society Meeting,October 1-5,2017,Cincinnati,OH,USA:1-8.
[26]TAN N M L,ABE T,AKAGI H.Design and performance of a bidirectional isolated DC-DC converter for a battery energy storage system[J].IEEE Transactions on Power Electronics,2012,27(3):1237-1248.
[2]李建林,马会萌,惠东.储能技术融合分布式可再生能源的现状及发展趋势[J].电工技术学报,2016,31(14):1-10.LI Jianlin,MA Huimeng,HUI Dong.Present development condition and trends of energy storage technology in the integration of distributed renewable energy[J].Transactions of China Electrotechnical Society,2016,31(14):1-10.
[3]CHENG Y,ZHANG C.Configuration and operation combined optimization for EV battery swapping station considering PV consumption bundling[J].Protection and Control of Modern Power Systems,2017,2(2):276-293.DOI:10.1186/s41601-017-0056-y.
[4]肖湘宁,陈征,刘念.可再生能源与电动汽车充放电设施在微电网中的集成模式与关键问题[J].电工技术学报,2013,28(2):1-14.XIAO Xiangning,CHEN Zheng,LIU Nian.Integrated mode and key issues of renewable energy sources and electric vehicles’charging and discharging facilities in microgrid[J].Transactions of China Electrotechnical Society,2013,28(2):1-14.
[5]周林,黄勇,郭珂,等.微电网储能技术研究综述[J].电力系统保护与控制,2011,39(7):147-152.ZHOU Lin,HUANG Yong,GUO Ke,et al.A survey of energy storage technology for micro grid[J].Power System Protection and Control,2011,39(7):147-152.
[6]王皓界,韩民晓,孔启祥.交直流混合微电网储能DC/DC及接口换流器协调控制[J].电力建设,2016,37(5):50-56.WANG Haojie,HAN Minxiao,KONG Qixiang.Coordinated control of energy storage DC/DC and interface converter in AC/DC hybrid microgrid[J].Electric Power Construction,2016,37(5):50-56.
[7]李江,张永利,刘强,等.分布式光储微电网系统并网控制策略研究[J].电力系统保护与控制,2017,45(23):90-97.LI Jiang,ZHANG Yongli,LIU Qiang,et al.Research on grid-connected control strategy of distributed PV-storage microgrid system[J].Power System Protection and Control,2017,45(23):90-97.
[8]晏坤,王辉,漆文龙,等.微电网储能系统中基于PWM加双重移相控制的双向DC/DC变换器研究[J].电力自动化设备,2015,35(4):44-52.YAN Kun,WANG Hui,QI Wenlong,et al.Bidirectional DC/DC converter based on PWM plus dual phase-shift control for microgrid storage system[J].Electric Power Automation Equipment,2015,35(4):44-52.
[9]王盼宝,王卫,刘鸿鹏,等.移相全桥变换器在直流微电网储能单元中的应用[J].电力自动化设备,2016,36(3):67-72.WANG Panbao,WANG Wei,LIU Hongpeng,et al.Application of phase-shifting full-bridge converter in energy storage unit of DC microgrid[J].Electric Power Automation Equipment,2016,36(3):67-72.
[10]米阳,吴彦伟,符杨,等.独立光储直流微电网分层协调控制[J].电力系统保护与控制,2017,45(8):37-45.MI Yang,WU Yanwei,FU Yang,et al.Hierarchical coordinated control of island DC microgrid with photovoltaic and storage system[J].Power System Protection and Control,2017,45(8):37-45.
[11]马益平.考虑电动汽车调度的微电网混合储能容量优化配置[J].电力系统保护与控制,2017,45(23):98-107.MA Yiping.Hybrid energy storage capacity optimization configuration for micro-grid considering EVscheduling[J].Power System Protection and Control,2017,45(23):98-107.
[12]DOBBS B G,CHAPMAN P L.A multiple-input DC-DCconverter topology[J].IEEE Power Electronics Letters,2003,1(1):6-9.
[13]LIU Y C,CHEN Y M.A systematic approach to synthesizing multi-input DC/DC converters[C]//2007IEEE Power Electronics Specialists Conference,June17-21,2007,Orlando,FL,USA:2626-2632.
[14]KHALIGH A,CAO J,LEE Y J.A multiple-input DC-DCconverter topology[J].IEEE Transactions on Power Electronics,2009,24(3):862-868.
[15]MATSUO H,LIN W,KUROKAWA F,et al.Characteristics of the multiple-input DC-DC converter[J].IEEE Transactions on Industrial Electronics,1993,51(3):625-631.
[16]ZHANG N,SUTANTO D,MUTTAQI K M.A review of topologies of three-port DC-DC converters for the integration of renewable energy and energy storage system[J].Renewable&Sustainable Energy Reviews,2016,56(2):388-401.
[17]宫金武,查晓明,王盼,等.大容量多端口变换器拓扑研究综述[J].电源学报,2017,15(5):1-9.GONG Jinwu,ZHA Xiaoming,WANG Pan,et al.Review of topology research on high-power multi ports converter[J].Journal of Power Supply,2017,15(5):1-9.
[18]谢军,张崇巍,刘胜永,等.用于新能源发电系统ZVS多端口DC/DC变流器[J].电力电子技术,2012,46(8):23-25.XIE Jun,ZHANG Chongwei,LIU Shengyong,et al.AZVS multi-port DC/DC converter for new energy electricity generation system[J].Power Electronics,2012,46(8):23-25.
[19]ZHAO C,ROUND S D,KOLAR J W.An isolated three-port bidirectional DC-DC converter with decoupled power flow management[J].IEEE Transactions on Power Electronics,2008,23(5):2443-2453.
[20]WANG L,WANG Z,LI H.Asymmetrical duty cycle control and decoupled power flow design of a three-port bidirectional DC-DC converter for fuel cell vehicle application[J].IEEE Transactions on Power Electronics,2012,27(2):891-904.
[21]宋鑫,肖建国,牛洁茹,等.一种用于新能源混合发电的移相控制三端口DC-DC变流器[J].电工技术学报,2015,30(17):36-44.SONG Xin,XIAO Jianguo,NIU Jieru,et al.A three-port DC-DC converter with phase shift control for the hybrid renewable energy generation system[J].Transactions of China Electrotechnical Society,2015,30(17):36-44.
[22]王政,储凯,张兵,等.移相占空比控制的三端口双向直流变换器[J].电机与控制学报,2015,19(7):81-87.WANG Zheng,CHU Kai,ZHANG Bing,et al Three-port bidirectional DC/DC converter with duty cycle and phase-shifting control[J].Electric Machines and Control,2015,19(7):81-87.
[23]HUANG J,WANG Y,LI Z,et al.Predictive valley-peak current control of isolated bidirectional dual active bridge DC-DC converter[C]//Energy Conversion Congress and Exposition,September 20-24,2015,Montreal,QC,Canada:1467-1472.
[24]DUTTA S,HAZRA S,BHATTACHARYA S.A digital predictive current-mode controller for a single-phase high-frequency transformer-isolated dual-active bridge DC-to-DC converter[J].IEEE Transactions on Industrial Electronics,2016,63(9):5943-5952.
[25]CHATTOPADHYAY R,ACHARYA S,GOHIL G,et al.One switching cycle current control strategy for triple active bridge phase-shifted DC-DC converter[C]//Industry Applications Society Meeting,October 1-5,2017,Cincinnati,OH,USA:1-8.
[26]TAN N M L,ABE T,AKAGI H.Design and performance of a bidirectional isolated DC-DC converter for a battery energy storage system[J].IEEE Transactions on Power Electronics,2012,27(3):1237-1248.