一种基于并联谐振的高频隔离型并网逆变器
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摘要
针对DC-DC变换型高频隔离型逆变器中开关损耗大、电压尖峰大、稳定性差的问题,提出由并联谐振与传统DC-DC变换型逆变器相结合的新型逆变器电路拓扑。该逆变器可以实现高频功率器件的零电压开通、体二极管和整流二极管的软关断,从而消除功率器件的开关尖峰,减小逆变器的损耗。详细介绍电路的工作过程和各开关器件软开关原理,同时建立电路的谐振等效模型,以及谐振参数对增益和软开关的影响关系,给出谐振参数的设计原则。为了消除由于加入死区而引入的低次谐波,在控制系统中添加了死区补偿,以提高逆变电流质量。最后制作实验样机,经过实验验证电路拓扑和控制策略的正确性。
Traditional DC-DC high-frequency isolated grid-connected inverter has the problems of high loss, voltage spike and low stability. A novel topology combining with parallel resonance and DC-DC converter was proposed. This novel topology can achieve zero voltage switching(ZVS) for the high-frequency switch, which reduces the loss of the inverter. The working principle and switch states are introduced in detail, then the resonant equivalent circuit model is built and its design principle of resonant parameters is given. To eliminate low harmonics generated by the dead-zone, the dead-time compensation is applied in the control system. Finally, a prototype is produced, and the experiments verify the correctness of the circuit topology and control strategy.
Traditional DC-DC high-frequency isolated grid-connected inverter has the problems of high loss, voltage spike and low stability. A novel topology combining with parallel resonance and DC-DC converter was proposed. This novel topology can achieve zero voltage switching(ZVS) for the high-frequency switch, which reduces the loss of the inverter. The working principle and switch states are introduced in detail, then the resonant equivalent circuit model is built and its design principle of resonant parameters is given. To eliminate low harmonics generated by the dead-zone, the dead-time compensation is applied in the control system. Finally, a prototype is produced, and the experiments verify the correctness of the circuit topology and control strategy.
引文
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[12]吴保芳,张胜发,权建洲,等.新型SPWPM模式变换器高频链原理分析[J].中国电机工程学报,2005,25(12):57-61.Wu Baofang,Zhang Shengfa,Quan Jianzhou,et al.High frequency link principle analysis on novel SPWPM model converter[J].Proceedings of the CSEE,2005,25(12):57-61.
[13]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.Li Ju,Ruan Xinbo.Hybrid control strategy of full bridge LLC converters[J].Transactions of China Electrotechnical Society,2013,28(4):72-79.
[14]Rashid M H.Power electronics handbook[M].Beijing:China Machine Press,2003.
[15]孙鹏.基于并联谐振变换器的长脉冲调制器研究[D].成都:西南交通大学,2014.
[2]王强,王天施,孙海军,等.新型高效率并联谐振直流环节软开关逆变器[J].电工技术学报,2013,28(5):219-226.Wang Qiang,Wang Tianshi,Sun Haijun,et al.Novel high efficiency parallel resonant DC link softswitching inverter[J].Transactions of China Electrotechnical Society,2013,28(5):219-226.
[3]Li Xuecheg,Liang Hui,Geng Junli.High-frequency isolated grid-connected PV inverter based on SPWPM[J].Transportation Electrification AsiaPacific(ITEC Asia-Pacific),2014 IEEE Conference and Expo.,Beijing,2014,DOI:10.1109/ITEC-AP.2014.6940722.
[4]胡存刚,姚培,张云雷,等.高效非隔离单相并网MOSFET逆变器拓扑及控制策略[J].电工技术学报,2016,31(13):82-91.Hu Cungang,Yao Pei,Zhang Yunlei,et al.Topology and control strategy for high-efficient non-isolated single-phase grid-connected MOSFET inverter[J].Transactions of China Electrotechnical Society,2016,31(13):82-91.
[5]Divan D M.The resonant DC link converter-a new concept in static power conversion[J].IEEE Transactions on Industry Applications,1989,25(2):317-325.
[6]尹培培,洪峰,王成华,等.无源无损软开关双降压式全桥逆变器[J].电工技术学报,2014,29(6):40-48.Yin Peipei,Hong Feng,Wang Chenghua,et al.Passive lossless soft-switching dual buck full bridge inverter[J].Transactions of China Electrotechnical Society,2014,29(6):40-48.
[7]武琳,刘志刚,洪祥.隔离式双向全桥DC-DC变换器的功率控制特性比较与分析[J].电工技术学报,2013,28(10):179-187.Wu lin,Liu Zhigang,Hong Xiang.Comparison and analysis of power control characteristic for isolated bidirectional full-bridge DC-DC converter[J].Transactions of China Electrotechnical Society,2013,28(10):179-187.
[8]张治国,谢运祥,袁兆梅.LCC谐振变换器的电路特性分析[J].电工技术学报,2013,28(4):50-57.Zhang Zhiguo,Xie Yunxiang,Yuan Zhaomei.Analysis of circuit characteristics of LCC resonant converter[J].Transactions of China Electrotechnical Society,2013,28(4):50-57.
[9]张治国,谢运祥,袁兆梅.并联谐振变换器的电路特性分析[J].华南理工大学学报:自然科学版,2013,41(3):33-38.Zhang Zhiguo,Xie Yunxiang,Yuan Zhaomei.Analysis of circuit characteristics of parallel resonant converter[J].Journal of South China University of Technology:Social Science Edition,2013,41(3):33-38.
[10]刘军,石健将,张仲超,等.并联谐振变流器电流断续模式的应用[J].浙江大学学报:工学版,2010,44(3):516-519.Liu Jun,Shi Jianjiang,Zhang Zhongchao,et al.Application of parallel resonant converter operating in discontinuous current mode[J].Journal of Zhejiang University:Engineering Science,2010,44(3):516-519.
[11]Tsai M C.Analysis and implementation of a fullbridge constant-frenquency LCC-type parallel resonant converter[J].IEEE Proceedings of Electric Power Applicaitons,1994,141(3):121-128.
[12]吴保芳,张胜发,权建洲,等.新型SPWPM模式变换器高频链原理分析[J].中国电机工程学报,2005,25(12):57-61.Wu Baofang,Zhang Shengfa,Quan Jianzhou,et al.High frequency link principle analysis on novel SPWPM model converter[J].Proceedings of the CSEE,2005,25(12):57-61.
[13]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.Li Ju,Ruan Xinbo.Hybrid control strategy of full bridge LLC converters[J].Transactions of China Electrotechnical Society,2013,28(4):72-79.
[14]Rashid M H.Power electronics handbook[M].Beijing:China Machine Press,2003.
[15]孙鹏.基于并联谐振变换器的长脉冲调制器研究[D].成都:西南交通大学,2014.