混合模块化直流固态变压器Ⅱ:动态特性及快速响应控制
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摘要
基于移相式-双有源桥(PS-DAB)变换器和串联谐振式-双有源桥(SR-DAB)变换器模块组合的混合模块化直流固态变压器(HMDCSST),兼具PS-DAB和SR-DAB在灵活控制和高效变换方面的优势,主要对其动态特性和快速响应控制策略进行研究。HMDCSST采用输入串联输出并联(ISOP)结构,在对PS-DAB和SR-DAB分别建立平均值和小信号模型的基础上,建立HMDCSST的整体小信号模型,并通过仿真证明小信号模型的准确性。为提高直流固态变压器的动态响应速度,抑制输入电压与负载功率扰动对输出电压的影响,提出一种输入电压前馈与负载功率预测相结合的快速响应控制策略,并利用频域分析伯德图对控制系统的稳定性进行分析。最后构建HMDCSST实验平台,对提出的快速响应控制策略进行实验验证,并与传统PI控制进行对比,实验结果验证了所提控制策略的有效性和优越性。
The hybrid modular DC solid state transformer(HMDCSST), based on the phase shift-dual active bridge(PS-DAB) converter and the series resonant-dual active bridge(SR-DAB),combines the advantages of PS-DAB in flexible control and SR-DAB in efficient conversion. This paper studies the dynamic characteristics and rapid response control of the HMDCSST. By analyzing the average and small signal models of PS-DAB and SR-DAB respectively, the small signal model of HMDCSST with ISOP structure was established, and the accuracy is proved by simulation. To improve the dynamic response and minimize the interference effect of input voltage and load disturbance on output voltage, a rapid dynamic response control strategy combining input voltage feedforward and load power prediction was presented. The stability analysis of this new control strategy was demonstrated by using the frequency domain Bode curve. Finally, the HMDCSST prototype was built to verify the rapid dynamic response control. Compared with the traditional PI method, the experimental results show the effectiveness and superiority of the proposed control strategy.
The hybrid modular DC solid state transformer(HMDCSST), based on the phase shift-dual active bridge(PS-DAB) converter and the series resonant-dual active bridge(SR-DAB),combines the advantages of PS-DAB in flexible control and SR-DAB in efficient conversion. This paper studies the dynamic characteristics and rapid response control of the HMDCSST. By analyzing the average and small signal models of PS-DAB and SR-DAB respectively, the small signal model of HMDCSST with ISOP structure was established, and the accuracy is proved by simulation. To improve the dynamic response and minimize the interference effect of input voltage and load disturbance on output voltage, a rapid dynamic response control strategy combining input voltage feedforward and load power prediction was presented. The stability analysis of this new control strategy was demonstrated by using the frequency domain Bode curve. Finally, the HMDCSST prototype was built to verify the rapid dynamic response control. Compared with the traditional PI method, the experimental results show the effectiveness and superiority of the proposed control strategy.
引文
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[12]王世恩,郑泽东,李永东.串联谐振双有源桥DC-DC变换器的频域分析[J].大功率变流技术2017(4):26-30.Wang Shien,Zheng Zedong,Li Yongdong Frequency domain analysis of series resonant dual active bridge DC-DC converter[J].High Power Converter Technology,2017(4):26-30.
[13]吴秀娟,孙孝峰,邬伟扬.串联谐振变换器的扩展描述函数法建模研究[J].电力电子技术,2011,45(4):22-24.Wu Xiujuan,Sun Xiaofeng,Wu Weiyang.Modeling resech based on extended description funciton of series resonant converter[J].Power Electrics,201145(4):22-24.
[14]Yan Bao,Le Yi Wang,Wang Caisheng,et al Adaptive feedforward compensation for voltage source disturbance rejection in DC-DC converters[J]IEEE Transactions on Control Systems Technology2018,26(1):344-351.
[15]贾鹏宇,郑琼林,李艳,等.级联系统中Buck充电调节器前馈控制方法[J].电工技术学报,2014,29(10):134-140.Jia Pengyu,Trillion Q.Zheng,Li Yan,et al.Research on feedforward control of Buck circuit as battery charge regulator in cascade system[J].Transactions of China Electrotechnical Society,2014,29(10):134-140.
[16]杨柯欣,宋文胜,安峰,等.双向有源全桥DC-DC变换器电流源模式的快速动态响应控制方法[J].中国电机工程学报,2018,38(8):2439-2448.Yang Kexin,Song Wensheng,An Feng,et al.Rapid dynamic response control of dual-active-bridge DC-DC converters in current source mode[J].Proceedings of the CSEE,2018,38(8):2439-2448.
[17]Sha Deshang,Zhang Jiankun,Wang Xiao,et al Dynamic response improvements of parallelconnected bidirectional DC-DC converters for electrical drive powered by low-voltage battery employing optimized feedforward control[J].IEEETransactions on Power Electronics,2013,32(10):7783-7794.
[18]Segaran D,Holmes D G,McGrath B P,et al Enhanced load step response for a bi-directional DC-DC converter[J].IEEE Transactions on Power Electronics,2013,28(1):3649-3656.
[2]Zhao Biao,Song Qiang,Liu Wenhua.Power characterization of isolated bidirectional dualactive-bridge DC-DC converter with dual-phase-shift control[J].IEEE Transactions on Power Electronics,2012,27(9):4172-4176.
[3]Gabriel Ortiz,Michael Leibl,Jonas Huber,et al.Design and experimental testing of a resonant DC-DCconverter for solid-state transformers[J].IEEETransactions on Power Electronics,2017,32(10):7534-7542.
[4]李菊,阮新波.全桥LLC谐振变换器的混合式控制策略[J].电工技术学报,2013,28(4):72-79,94.Li Ju,Ruan Xinbo.Hybrid control strategy of full bridge LLC converters[J].Transactions of China Electrotechnical Society,2013,28(4):72-79,94.
[5]赵彪,宋强,刘文华,等.用于柔性直流配电的高频链直流固态变压器[J].中国电机工程学报,2014,34(25):4295-4303.Zhao Biao,Song Qiang,Liu Wenhua,et al.High frequency link DC solid state transformers for flexible DC distribution[J].Proceedings of the CSEE,2014,34(25):4295-4303.
[6]张雪垠,徐永海,肖湘宁.适用于中高压配电网的高功率密度谐振型级联H桥固态变压器[J].电工技术学报,2018,33(2):310-321.Zhang Xueyin,Xu Yonghai,Xiao Xiangning.A high power density resonance cascaded H-bridge solid state transformer for medium and high voltage distribution network[J].Transactions of China Electrotechnical Society,2018,33(2):310-321.
[7]付超,武承杰,孙玉巍,等.混合模块化直流固态变压器I:工作原理与稳态特性[J].电工技术学报2019,34(增刊1):141-153.Fu Chao,Wu Chengjie,Sun Yuwei,et al.Hybrid modular direct current solid state transformer I:working principle and analysis of steady state characteristics[J].Transactions of China Electrotechnical Society,2019,34(S1):141-153.
[8]Qin H,Kimball J W.Generalized average modeling of dual active bridge DC-DC converter[J].IEEETransactions on Power Electronics,2012,27(4):2078-2084.
[9]Rodiguez A,Vazquez A,Lamar D G,et al.Different purpose design strategies and techniques to improve the performance of a dual active bridge with phase shift control[J].IEEE Transactions on Power Electronics,2014,30(2):790-804.
[10]Zhang K,Shan Z,Jatskevich J.Large-and smal-signal average value modeling of dual-active-bridge DC-DCconverter considering power losses[J].IEEE Transactions on Power Electronics,2017,32(3):1964-1974.
[11]吴俊娟,邬伟扬,代明辉.基于移相控制的串联谐振变换器稳态分析[J].电力电子技术,2010,44(2):34-36.Wu Junjuan,Wu Weiyang,Dai Minghui.Steady state analysis of the series resonant converter based on phase-shifted control[J].Power Electronics,201044(2):34-36.
[12]王世恩,郑泽东,李永东.串联谐振双有源桥DC-DC变换器的频域分析[J].大功率变流技术2017(4):26-30.Wang Shien,Zheng Zedong,Li Yongdong Frequency domain analysis of series resonant dual active bridge DC-DC converter[J].High Power Converter Technology,2017(4):26-30.
[13]吴秀娟,孙孝峰,邬伟扬.串联谐振变换器的扩展描述函数法建模研究[J].电力电子技术,2011,45(4):22-24.Wu Xiujuan,Sun Xiaofeng,Wu Weiyang.Modeling resech based on extended description funciton of series resonant converter[J].Power Electrics,201145(4):22-24.
[14]Yan Bao,Le Yi Wang,Wang Caisheng,et al Adaptive feedforward compensation for voltage source disturbance rejection in DC-DC converters[J]IEEE Transactions on Control Systems Technology2018,26(1):344-351.
[15]贾鹏宇,郑琼林,李艳,等.级联系统中Buck充电调节器前馈控制方法[J].电工技术学报,2014,29(10):134-140.Jia Pengyu,Trillion Q.Zheng,Li Yan,et al.Research on feedforward control of Buck circuit as battery charge regulator in cascade system[J].Transactions of China Electrotechnical Society,2014,29(10):134-140.
[16]杨柯欣,宋文胜,安峰,等.双向有源全桥DC-DC变换器电流源模式的快速动态响应控制方法[J].中国电机工程学报,2018,38(8):2439-2448.Yang Kexin,Song Wensheng,An Feng,et al.Rapid dynamic response control of dual-active-bridge DC-DC converters in current source mode[J].Proceedings of the CSEE,2018,38(8):2439-2448.
[17]Sha Deshang,Zhang Jiankun,Wang Xiao,et al Dynamic response improvements of parallelconnected bidirectional DC-DC converters for electrical drive powered by low-voltage battery employing optimized feedforward control[J].IEEETransactions on Power Electronics,2013,32(10):7783-7794.
[18]Segaran D,Holmes D G,McGrath B P,et al Enhanced load step response for a bi-directional DC-DC converter[J].IEEE Transactions on Power Electronics,2013,28(1):3649-3656.