单相电力电子变压器中串联谐振型双有源桥电流特性分析
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摘要
三级式电力电子变压器(PET)因其良好的控制特性,受到了广泛关注和应用。三级式PET由输入级、隔离级和输出级构成,各级之间通过储能电容相连。由于功率半导体器件的耐压水平有限,一般此类PET由多个功率模块级联构成。各功率模块的中间环节通常采用串联谐振型双有源桥(DAB)变换器来实现不同直流电压等级之间的电能变换与电气隔离。本文在考虑PET交流输入侧、直流输出侧瞬时功率分布规律的基础上,建立了单相PET功率模块的动态等效电路模型,推导了其中串联谐振型DAB的电流时域解析表达式及其简化模型。通过所搭建的Matlab/Simulink仿真模型和电力电子变压器功率模块测试平台验证了该模型的正确性。
The three-stage power electronic transformer(PET) has been widely concerned and applied because of its good control performances. This type PET is composed of input, isolation and output stages, which are connected by the energy storage capacitance. Owing to the limited voltage level of power semiconductor devices, a plurality of power modules constitute the PET through cascade connection. The intermediate part of the power module usually adopts the series resonant dual active bridge(DAB) to realize electrical isolation and energy conversion between different DC voltage levels. On account of the instantaneous power distribution characteristic of the single-phase PET AC input and DC output sides, a dynamic equivalent circuit model of the power module is proposed in this paper. Then, this paper derives the analytical current expression and simplified model of the series resonate DAB in time domain. The validity of the model is verified by the simulation built in the Matlab/Simulink and PET power submodules test platform.
The three-stage power electronic transformer(PET) has been widely concerned and applied because of its good control performances. This type PET is composed of input, isolation and output stages, which are connected by the energy storage capacitance. Owing to the limited voltage level of power semiconductor devices, a plurality of power modules constitute the PET through cascade connection. The intermediate part of the power module usually adopts the series resonant dual active bridge(DAB) to realize electrical isolation and energy conversion between different DC voltage levels. On account of the instantaneous power distribution characteristic of the single-phase PET AC input and DC output sides, a dynamic equivalent circuit model of the power module is proposed in this paper. Then, this paper derives the analytical current expression and simplified model of the series resonate DAB in time domain. The validity of the model is verified by the simulation built in the Matlab/Simulink and PET power submodules test platform.
引文
[1] 陈启超,纪延超,潘延林,等(Chen Qichao, Ji Yanchao, Pan Yanlin, et al.).配电系统电力电子变压器拓扑结构综述(Review of power electronic transformer topologies applied to distribution system)[J].电工电能新技术(Advanced Technology of Electrical Engineering and Energy),2015,34(3):41-48.
[2] 王优,郑泽东,李永东 (Wang You, Zheng Zedong, Li Yongdong).中高压电力电子变压器拓扑与控制应用综述(Review of topology and control application of medium and high voltage power electronic transformer)[J].电工电能新技术(Advanced Technology of Electrical Engineering and Energy),2017,36(5):1-10.
[3] 李子欣,高范强,徐飞,等(Li Zixin,Gao Fanqiang,Xu Fei,et al.).中压配电网用 10kVac-750Vdc /1MVA电力电子变压器功率密度影响因素研究(Power density analysis of 10kVac-750Vdc/1MVA power electronic transformer/solid-state transformer for medium voltage distribution grid)[J].电工电能新技术 (Advanced Technology of Electrical Engineering and Energy),2016,35(6): 1-6.
[4] 高范强,李子欣,徐飞,等(Gao Fanqiang,Li Zixin,Xu Fei,et al.).一种高频链模块化电力电子变压器(Power electronic transformer based on modular converter with high-frequency link)[J].电工电能新技术(Advanced Technology of Electrical Engineering and Energy),2017,36(5): 51-58.
[5] 汪洋,赵楠,张捷颖,等(Wang Yang,Zhao Nan,Zhang Jieying,et al.).应用于电力电子变压器的双向DC-DC变换器综述(A summary of bidirectional DC-DC converter applied in power electronic transformer)[J].大功率变流技术(High Power Converter Technology),2017,(4):31-36.
[6] 季振东,李东野,孙毅超,等(Ji Zhendong,Li Dongye,Sun Yichao,et al.).一种三相级联型电力电子变压器及其控制策略研究 (Research on a three-phase cascaded power electronic transformer and its control strategy)[J].电机与控制学报(Electric Machines and Control),2016,20 (8):32-39, 47.
[7] Inoue S, Akagi H. A bidirectional isolated DC-DC converter as a core circuit of the next-generation medium-voltage power conversion system[J].IEEE Transactions on Power Electronics, 2007, 22(2): 535-542.
[8] 王世恩,郑泽东,李永东(Wang Shi’en,Zheng Zedong,Li Yongdong).串联谐振双有源桥DC-DC变换器的频域分析(Frequency domain analysis of dual active bridge DC-DC converter with series resonant)[J].大功率变流技术(High Power Converter Technology),2017,(4):26-30.
[9] Steiner M,Reinold H.Medium frequency topology in railway applications[A]. Proceedings of 2007 European Conference on Power Electronics and Applications[C].Aalborg,Denmark,2007. 1-10.
[10] 王轩,付永生,晋湾湾,等(Wang Xuan,Fu Yongsheng,Jin Wanwan,et al.). 一种新型结构的电力电子变压器(Novel topology of power electronic transformer)[J].电工电能新技术(Advanced Technology of Electrical Engineering and Energy),2017,36(5):67-74.
[11] 李子欣,王平,楚遵方,等(Li Zixin,Wang Ping,Chu Zunfang,et al.). 面向中高压智能配电网的电力电子变压器研究(Research on medium- and high-voltage smart distribution grid oriented power electronic transformer)[J].电网技术(Power System Technology),2013,37 (9):2592-2601.
[12] 刘闯,齐瑞鹏,刘海军,等(Liu Chuang,Qi Ruipeng,Liu Haijun,et al.).一种减小三相级联型PET各中间直流侧电容的方法(Method of decreasing intermediate DC-link capacitors for three-phase cascaded power electronics transformer)[J].电力自动化设备(Electric Power Automation Equipment),2017,37 (11):46-53.
[13] Witulski Arthur F, Hernandez Adhn F, Erickson Robert W. Small signal equivalent circuit modeling of resonant converter[J]. IEEE Transaction on Power Electronics, 1991, 6(1): 11-27.
[14] Molla-Ahmadian Hamed, Karimpour Ali, Pariz Naser, et al. Hybrid modeling of a DC-DC series resonant converter: Direct piecewise affine approach[J]. IEEE Transaction on Circuits and Systems - I: Regular Papers, 2012, 59(12): 3112-3120.
[15] Esser Albert, Skudelny Hans-Christoph. A new approach to power supplies for robots[J]. IEEE Transaction on Industry Applications, 1991, 27(5): 872-875.
[16] Li Zixin, Qu Ping, Wang Ping, et al. DC terminal dynamic model of dual active bridge series resonant converters[A]. 2014 IEEE Transportation Electrification Conference and Expo, Asia-Pacific (ITEC Asia-Pacific) [C]. Beijing, China, 2014. 1-5.
[17] Huber Jonas E, Kolar Johann W. Analysis and design of fixed voltage transformer ratio DC/DC converter cells for phase-modular solid-state transformers[A]. 2015 IEEE Energy Conversion Congress and Exposition (ECCE) [C]. Montreal, Canada, 2015. 5021-5029.
[18] 徐欢,朱国荣,梁标,等(Xu Huan,Zhu Guorong,Liang Biao,et al.).在单相高频整流器中抑制直流纹波电流的控制方法研究(Research on control strategy of mitigating the DC ripple current in single-phase high frequency rectifier)[J].电力电容器与无功补偿(Power Capacitor & Reactive Power Compensation),2017,38(2):141-148.
[19] 高吉磊,张雅静,林飞,等(Gao Jilei, Zhang Yajing, Lin Fei, et al.).单相PWM整流器谐波电流抑制算法研究(Research on harmonic current elimination method of single-phase PWM rectifiers)[J]. 中国电机工程学报(Proceedings of the CSEE),2010,30(21):32-39.
[20] 李建国,宋强,刘文华,等(Li Jianguo,Song Qiang,Liu Wenhua, et al.).一种模块化多电平换流阀的等效功率对冲实验及控制方法(An equivalent convertor valve’s back to back power test and its control method for modular multilevel converters)[J].中国电机工程学报(Proceedings of the CSEE),2016,36(7):1951-1958.
[2] 王优,郑泽东,李永东 (Wang You, Zheng Zedong, Li Yongdong).中高压电力电子变压器拓扑与控制应用综述(Review of topology and control application of medium and high voltage power electronic transformer)[J].电工电能新技术(Advanced Technology of Electrical Engineering and Energy),2017,36(5):1-10.
[3] 李子欣,高范强,徐飞,等(Li Zixin,Gao Fanqiang,Xu Fei,et al.).中压配电网用 10kVac-750Vdc /1MVA电力电子变压器功率密度影响因素研究(Power density analysis of 10kVac-750Vdc/1MVA power electronic transformer/solid-state transformer for medium voltage distribution grid)[J].电工电能新技术 (Advanced Technology of Electrical Engineering and Energy),2016,35(6): 1-6.
[4] 高范强,李子欣,徐飞,等(Gao Fanqiang,Li Zixin,Xu Fei,et al.).一种高频链模块化电力电子变压器(Power electronic transformer based on modular converter with high-frequency link)[J].电工电能新技术(Advanced Technology of Electrical Engineering and Energy),2017,36(5): 51-58.
[5] 汪洋,赵楠,张捷颖,等(Wang Yang,Zhao Nan,Zhang Jieying,et al.).应用于电力电子变压器的双向DC-DC变换器综述(A summary of bidirectional DC-DC converter applied in power electronic transformer)[J].大功率变流技术(High Power Converter Technology),2017,(4):31-36.
[6] 季振东,李东野,孙毅超,等(Ji Zhendong,Li Dongye,Sun Yichao,et al.).一种三相级联型电力电子变压器及其控制策略研究 (Research on a three-phase cascaded power electronic transformer and its control strategy)[J].电机与控制学报(Electric Machines and Control),2016,20 (8):32-39, 47.
[7] Inoue S, Akagi H. A bidirectional isolated DC-DC converter as a core circuit of the next-generation medium-voltage power conversion system[J].IEEE Transactions on Power Electronics, 2007, 22(2): 535-542.
[8] 王世恩,郑泽东,李永东(Wang Shi’en,Zheng Zedong,Li Yongdong).串联谐振双有源桥DC-DC变换器的频域分析(Frequency domain analysis of dual active bridge DC-DC converter with series resonant)[J].大功率变流技术(High Power Converter Technology),2017,(4):26-30.
[9] Steiner M,Reinold H.Medium frequency topology in railway applications[A]. Proceedings of 2007 European Conference on Power Electronics and Applications[C].Aalborg,Denmark,2007. 1-10.
[10] 王轩,付永生,晋湾湾,等(Wang Xuan,Fu Yongsheng,Jin Wanwan,et al.). 一种新型结构的电力电子变压器(Novel topology of power electronic transformer)[J].电工电能新技术(Advanced Technology of Electrical Engineering and Energy),2017,36(5):67-74.
[11] 李子欣,王平,楚遵方,等(Li Zixin,Wang Ping,Chu Zunfang,et al.). 面向中高压智能配电网的电力电子变压器研究(Research on medium- and high-voltage smart distribution grid oriented power electronic transformer)[J].电网技术(Power System Technology),2013,37 (9):2592-2601.
[12] 刘闯,齐瑞鹏,刘海军,等(Liu Chuang,Qi Ruipeng,Liu Haijun,et al.).一种减小三相级联型PET各中间直流侧电容的方法(Method of decreasing intermediate DC-link capacitors for three-phase cascaded power electronics transformer)[J].电力自动化设备(Electric Power Automation Equipment),2017,37 (11):46-53.
[13] Witulski Arthur F, Hernandez Adhn F, Erickson Robert W. Small signal equivalent circuit modeling of resonant converter[J]. IEEE Transaction on Power Electronics, 1991, 6(1): 11-27.
[14] Molla-Ahmadian Hamed, Karimpour Ali, Pariz Naser, et al. Hybrid modeling of a DC-DC series resonant converter: Direct piecewise affine approach[J]. IEEE Transaction on Circuits and Systems - I: Regular Papers, 2012, 59(12): 3112-3120.
[15] Esser Albert, Skudelny Hans-Christoph. A new approach to power supplies for robots[J]. IEEE Transaction on Industry Applications, 1991, 27(5): 872-875.
[16] Li Zixin, Qu Ping, Wang Ping, et al. DC terminal dynamic model of dual active bridge series resonant converters[A]. 2014 IEEE Transportation Electrification Conference and Expo, Asia-Pacific (ITEC Asia-Pacific) [C]. Beijing, China, 2014. 1-5.
[17] Huber Jonas E, Kolar Johann W. Analysis and design of fixed voltage transformer ratio DC/DC converter cells for phase-modular solid-state transformers[A]. 2015 IEEE Energy Conversion Congress and Exposition (ECCE) [C]. Montreal, Canada, 2015. 5021-5029.
[18] 徐欢,朱国荣,梁标,等(Xu Huan,Zhu Guorong,Liang Biao,et al.).在单相高频整流器中抑制直流纹波电流的控制方法研究(Research on control strategy of mitigating the DC ripple current in single-phase high frequency rectifier)[J].电力电容器与无功补偿(Power Capacitor & Reactive Power Compensation),2017,38(2):141-148.
[19] 高吉磊,张雅静,林飞,等(Gao Jilei, Zhang Yajing, Lin Fei, et al.).单相PWM整流器谐波电流抑制算法研究(Research on harmonic current elimination method of single-phase PWM rectifiers)[J]. 中国电机工程学报(Proceedings of the CSEE),2010,30(21):32-39.
[20] 李建国,宋强,刘文华,等(Li Jianguo,Song Qiang,Liu Wenhua, et al.).一种模块化多电平换流阀的等效功率对冲实验及控制方法(An equivalent convertor valve’s back to back power test and its control method for modular multilevel converters)[J].中国电机工程学报(Proceedings of the CSEE),2016,36(7):1951-1958.