基于扩展相移的双有源全桥DC-DC变换器多目标优化控制方法
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摘要
文中以双有源全桥DC-DC变换器为研究对象,为了同时提高变换器的效率和动态性能,提出一种基于扩展相移的优化功率控制方法。通过全面分析变换器在扩展相移下的相移量关系以获取电流应力的全局最优解来进一步提高变换器效率。同时,通过引入虚拟电压分量对变换器的传输功率进行在线估算以提高其对于负载突变及输入电压突变时的响应能力。此外,该方法不需要储能电感等电路参数参与控制,增加了控制系统的兼容性和可移植性。最后,对所提出的扩展相移优化功率控制方法、双重相移的电流应力优化及传统扩展相移的电流应力优化算法进行对比实验验证。实验结果表明:该方法可以进一步地减小电流应力,提高变换器的效率,同时可显著地提高变换器对于输入电压突变和负载突变时的动态特性。
This paper proposed an optimized power control scheme with extended phase-shift control(OPC-EPS) for dual-active-bridge(DAB) DC-DC converters to improve the efficiency and dynamic performance. The global optimal solution of current stress was obtained to further improve the efficiency through comprehensive analysis on the phase-shift ratio conditions of DAB converters in EPS control. By introducing the virtual voltage component, the transmission power of DAB converters was estimated online to enhance the dynamic response under the input voltage fluctuation and load disturbance conditions. In addition, OPC-EPS scheme was not dependent on circuit parameters such as storage inductance, which can improve the compatibility and portability. Finally, three control schemes consisting of current stress optimized with dual phase-shift(CSO-DPS) control, current stress optimized with traditional extended phase-shift(CSO-TEPS) control and proposed OPC-EPS schemes were compared in a scale-down experimental platform. Experimental results show that the proposed OPC-EPS scheme can not only reduce the current stress and improve the efficiency, but also can significantly enhance the dynamic response of the DAB converter when the input voltage or the load steps down and up.
This paper proposed an optimized power control scheme with extended phase-shift control(OPC-EPS) for dual-active-bridge(DAB) DC-DC converters to improve the efficiency and dynamic performance. The global optimal solution of current stress was obtained to further improve the efficiency through comprehensive analysis on the phase-shift ratio conditions of DAB converters in EPS control. By introducing the virtual voltage component, the transmission power of DAB converters was estimated online to enhance the dynamic response under the input voltage fluctuation and load disturbance conditions. In addition, OPC-EPS scheme was not dependent on circuit parameters such as storage inductance, which can improve the compatibility and portability. Finally, three control schemes consisting of current stress optimized with dual phase-shift(CSO-DPS) control, current stress optimized with traditional extended phase-shift(CSO-TEPS) control and proposed OPC-EPS schemes were compared in a scale-down experimental platform. Experimental results show that the proposed OPC-EPS scheme can not only reduce the current stress and improve the efficiency, but also can significantly enhance the dynamic response of the DAB converter when the input voltage or the load steps down and up.
引文
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[14]Zhao B,Song Q,Liu W H,et al.Overview of dual-active-bridge isolated bidirectional DC-DC converter for high-frequency-link power-conversion system[J].IEEE Transactions on Power Electronics,2014,29(8):4091-4106.
[15]Demetriades G D,Nee H P.Dynamic modeling of the dual-active bridge topology for high-power applications[C]//Proceedings of 2008 IEEE Power Electronics Specialists Conference.Rhodes,Greece:IEEE,2008.
[16]Bai H,Mi C,Wang C W,et al.The dynamic model and hybrid phase-shift control of a dual-active-bridge converter[C]//Proceedings of the 34th Annual Conference of IEEE Industrial Electronics.Orlando,FL,USA:IEEE,2008:2840-2845.
[17]Bai H,Nie Z L,Mi C.Experimental comparison of traditional phase-shift,dual-phase-shift,and model-based control of isolated bidirectional DC-DC converters[J].IEEE Transactions on Power Electronics,2010,25(6):1444-1449.
[18]Segaran D,Holmes D G,McGrath B P.Enhanced load step response for a bidirectional DC-DC converter[J].IEEE Transactions on Power Electronics,2013,28(1):371-379.
[19]侯聂,宋文胜,武明义.全桥隔离DC/DC变换器的直接功率控制方法[J].电力系统自动化,2016,40(17):204-209.Hou Nie,Song Wensheng,Wu Mingyi.Direct power control scheme of full-bridge isolated DC/DCconverters[J].Automation of Electric Power Systems,2016,40(17):204-209(in Chinese).
[20]侯聂,宋文胜,武明义.双向全桥DC-DC变换器的负载电流前馈控制方法[J].中国电机工程学报,2016,36(9):2478-2485.Hou Nie,Song Wensheng,Wu Mingyi.A load current feedforward control scheme of dual active bridge DC/DCconverters[J].Proceedings of the CSEE,2016,36(9):2478-2485(in Chinese).
[21]Song W S,Hou N,Wu M Y.Virtual direct power control scheme of dual active bridge DC-DC converters for fast dynamic response[J].IEEE Transactions on Power Electronics,2018,33(2):1750-1759.
[22]Hou N,Song W S,Wu M Y.Minimum-current-stress scheme of dual active bridge DC-DC converter with unified phase-shift control[J].IEEE Transactions on Power Electronics,2016,31(12):8552-8561.
[2]Krismer F,Kolar J W.Efficiency-optimized high-current dual active bridge converter for automotive applications[J].IEEE Transactions on Industrial Electronics,2012,59(7):2745-2760.
[3]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.
[4]Inoue S,Akagi H.A bidirectional DC-DC converter for an energy storage system with galvanic isolation[J].IEEETransactions on Power Electronics,2007,22(6):2299-2306.
[5]Shi Y X,Li R,Xue Y S,et al.Optimized operation of current-fed dual active bridge DC-DC converter for PVapplications[J].IEEE Transactions on Industrial Electronics,2015,62(11):6986-6995.
[6]Mi C,Bai H,Wang C,et al.Operation,design and control of dual H-bridge-based isolated bidirectional DC-DCconverter[J].IET Power Electronics,2008,1(4):507-517.
[7]Zhao B,Song Q,Liu W H.Power characterization of isolated bidirectional dual-active-bridge DC-DCconverter with dual-phase-shift control[J].IEEETransactions on Power Electronics,2012,27(9):4172-4176.
[8]赵彪,于庆广,孙伟欣.双重移相控制的双向全桥DC-DC变换器及其功率回流特性分析[J].中国电机工程学报,2012,32(12):43-50.Zhao Biao,Yu Qingguang,Sun Weixin.Bi-directional full-bridge DC-DC converters with dual-phase-shifting control and its backflow power characteristic analysis[J].Proceedings of the CSEE,2012,32(12):43-50(in Chinese).
[9]Bai H,Mi C.Eliminate reactive power and increase system efficiency of isolated bidirectional dual-active-bridge DC-DC converters using novel dual-phase-shift control[J].IEEE Transactions on Power Electronics,2008,23(6):2905-2914.
[10]Kim M,Rosekeit M,Sul S K,et al.A dual-phase-shift control strategy for dual-active-bridge DC-DC converter in wide voltage range[C]//Proceedings of the 8th International Conference on Power Electronics.Jeju,South Korea:IEEE,2011.
[11]Zhao B,Song Q,Liu W H,et al.Current-stress-optimized switching strategy of isolated bidirectional DC-DCconverter with dual-phase-shift control[J].IEEETransactions on Industrial Electronics,2013,60(10):4458-4467.
[12]Zhao B,Yu Q G,Sun W X.Extended-phase-shift control of isolated bidirectional DC-DC converter for power distribution in microgrid[J].IEEE Transactions on Power Electronics,2012,27(11):4667-4680.
[13]张勋,王广柱,王婷.双向全桥DC-DC变换器基于电感电流应力的双重移相优化控制[J].电工技术学报,2016,31(22):100-106.Zhang Xun,Wang Guangzhu,Wang Ting.Optimized control based on current-stress of bi-directional full-Bridge DC-DC converters with dual-phase-shifting control[J].Transactions of China Electrotechnical Society,2016,31(22):100-106(in Chinese).
[14]Zhao B,Song Q,Liu W H,et al.Overview of dual-active-bridge isolated bidirectional DC-DC converter for high-frequency-link power-conversion system[J].IEEE Transactions on Power Electronics,2014,29(8):4091-4106.
[15]Demetriades G D,Nee H P.Dynamic modeling of the dual-active bridge topology for high-power applications[C]//Proceedings of 2008 IEEE Power Electronics Specialists Conference.Rhodes,Greece:IEEE,2008.
[16]Bai H,Mi C,Wang C W,et al.The dynamic model and hybrid phase-shift control of a dual-active-bridge converter[C]//Proceedings of the 34th Annual Conference of IEEE Industrial Electronics.Orlando,FL,USA:IEEE,2008:2840-2845.
[17]Bai H,Nie Z L,Mi C.Experimental comparison of traditional phase-shift,dual-phase-shift,and model-based control of isolated bidirectional DC-DC converters[J].IEEE Transactions on Power Electronics,2010,25(6):1444-1449.
[18]Segaran D,Holmes D G,McGrath B P.Enhanced load step response for a bidirectional DC-DC converter[J].IEEE Transactions on Power Electronics,2013,28(1):371-379.
[19]侯聂,宋文胜,武明义.全桥隔离DC/DC变换器的直接功率控制方法[J].电力系统自动化,2016,40(17):204-209.Hou Nie,Song Wensheng,Wu Mingyi.Direct power control scheme of full-bridge isolated DC/DCconverters[J].Automation of Electric Power Systems,2016,40(17):204-209(in Chinese).
[20]侯聂,宋文胜,武明义.双向全桥DC-DC变换器的负载电流前馈控制方法[J].中国电机工程学报,2016,36(9):2478-2485.Hou Nie,Song Wensheng,Wu Mingyi.A load current feedforward control scheme of dual active bridge DC/DCconverters[J].Proceedings of the CSEE,2016,36(9):2478-2485(in Chinese).
[21]Song W S,Hou N,Wu M Y.Virtual direct power control scheme of dual active bridge DC-DC converters for fast dynamic response[J].IEEE Transactions on Power Electronics,2018,33(2):1750-1759.
[22]Hou N,Song W S,Wu M Y.Minimum-current-stress scheme of dual active bridge DC-DC converter with unified phase-shift control[J].IEEE Transactions on Power Electronics,2016,31(12):8552-8561.