并联谐振型高升压比光伏并网系统
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摘要
为了使光伏并网系统具有高升压比的同时具备高转换效率,提出了一种非隔离高效两级式并网系统。该系统前级采用电感电容(LC)并联谐振网络产生高电压增益,其开关器件实现了零电压开关(ZVS);后级为典型的单相全桥逆变电路经过LCL滤波后实现并网。阐述了两级式光伏并网系统的工作原理,设计了电路参数;搭建了两级式光伏并网系统仿真模型并基于设计参数进行了仿真验证。仿真实验结果表明,所提出的两极式谐振升压光伏并网系统技术方案切实可行,较之于传统技术方案,实现了非隔离式高升压比,提高了系统工作效率。
In order to make the two-staged photovoltaic grid-connected system with high step-up ratio and high conversion efficiency,a non-isolated two-staged photovoltaic grid-connected system with high efficiency is proposed. The front system can achieve high voltage-gain using LC parallel resonant tank. Its switches have the features such as zero-voltage-switching( ZVS). The after system is a typical singlephase full bridge inverter connected with the LCL filter circuit,and realize the grid connection. The working principles of two-staged photovoltaic grid-connected system were given. And the circuit parameters were designed. The simulation model of two-staged photovoltaic grid-connected system was built. The simulation was carried out based on the design parameters. Simulation results show that the two-staged resonant step-up photovoltaic grid-connected system is correct,feasible and valid. Compared with the traditional technical scheme,it not only achieves the system with non-isolated and high step-up ratio,but also improves the efficiency of the system.
In order to make the two-staged photovoltaic grid-connected system with high step-up ratio and high conversion efficiency,a non-isolated two-staged photovoltaic grid-connected system with high efficiency is proposed. The front system can achieve high voltage-gain using LC parallel resonant tank. Its switches have the features such as zero-voltage-switching( ZVS). The after system is a typical singlephase full bridge inverter connected with the LCL filter circuit,and realize the grid connection. The working principles of two-staged photovoltaic grid-connected system were given. And the circuit parameters were designed. The simulation model of two-staged photovoltaic grid-connected system was built. The simulation was carried out based on the design parameters. Simulation results show that the two-staged resonant step-up photovoltaic grid-connected system is correct,feasible and valid. Compared with the traditional technical scheme,it not only achieves the system with non-isolated and high step-up ratio,but also improves the efficiency of the system.
引文
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[11]鲍陈磊,阮新波,王学华,等.基于PI调节器和电容电流反馈有源阻尼的LCL型并网逆变器闭环参数设计[J].中国电机工程学报,2012,32(25):133.BAO Chenlei,RUAN Xinbo,WANG Xuehua,et al. Design ofgrid-connected inverters with LCL filter based on PI regulator andcapacitor current feedback active damping[J]. Proceedings of theCSEE,2012,32(25):133.
[12] LI F,ZHANG X,ZHU H,et al. An LCL-LC filter for grid-con-nected converter:topology,parameter,and analysis[J]. IEEETransactions on Power Electronics,2015,30(9):5067.
[13]刘飞,查晓明,段善旭.三相并网逆变器LCL滤波器的参数设计与研究[J].电工技术学报,2010,25(3):110.LIU Fei,ZHA Xiaoming,DUAN Shanxu. Design and research onparameter of LCL filter in three-phase grid-connected inverter[J]. Transactions of China Electrotechnical Society,2010,25(3):110.
[2]刘斌,贺建军,粟梅,等.两级式单相逆变输入端纹波电流双反馈抑制[J].电工技术学报,2013,28(8):187.LIU Bin,HE Jianjun,SU Mei,et al. Input ripple current activemitigating for two-stage single-phase inverter based on doublechannel current feedback[J]. Transactions of China Electrotech-nical Society,2013,28(8):187.
[3]周翔,许建平,陈章勇.高升压增益软开关DC-DC变换器[J].电工技术学报,2016,31(14):156.ZHOU Xiang,XU Jianping,CHEN Zhangyong. Soft-switched DC-DC converter with high voltage gain[J]. Transactions of ChinaElectrotechnical Society,2016,31(14):156.
[4] KIM M J,CHOI S W. A fully soft-switched single switch isolatedDC–DC converter[J]. IEEE Trans,2015,30(9):4883.
[5] NGUYEN M K,LIM Y C,CHOI J H,et al. Isolated high step-upDC-DC converter based on quasi-switched-boost network[J].IEEE Trans,2016,63(12):7553.
[6]吴刚,阮新波,叶志红.采用开关电容的非隔离型高升压比直流变换器[J].中国电机工程学报,2015,35(2):442.WU Gang,RUAN Xinbo,YE Zhihong. Non-isolated high step-upDC-DC converters adopting switched-capacitor cell[J]. Proceed-ings of the CSEE,2015,35(2):442.
[7]陈武,吴小刚,蒋玮,等.一种适用于新能源并网的谐振升压变换器[J].电工技术学报,2016,31(8):27.CHEN Wu,WU Xiaogang,JIANG Wei,et al. A step-up resonantconverter for grid-connected renewable energy sources[J]. Trans-actions of China Electrotechnical Society,2016,31(8):27.
[8]刘鸿鹏,朱航,吴辉,等.新型光伏并网逆变器电压型控制方法[J].中国电机工程学报,2015,35(21):5560.LIU Hongpeng,ZHU Hang,WU Hui,et al. A novel voltage-con-trolled method for the grid-connected photovoltaic inverter[J].Proceedings of the CSEE,2015,35(21):5560.
[9]齐仁磊.基于交错反激拓扑的单相并网逆变器的研究[D].哈尔滨:哈尔滨工业大学,2012.
[10]黄建刚. 230 W两级式光伏并网逆变器的研究[D].南京:南京航空航天大学,2010.
[11]鲍陈磊,阮新波,王学华,等.基于PI调节器和电容电流反馈有源阻尼的LCL型并网逆变器闭环参数设计[J].中国电机工程学报,2012,32(25):133.BAO Chenlei,RUAN Xinbo,WANG Xuehua,et al. Design ofgrid-connected inverters with LCL filter based on PI regulator andcapacitor current feedback active damping[J]. Proceedings of theCSEE,2012,32(25):133.
[12] LI F,ZHANG X,ZHU H,et al. An LCL-LC filter for grid-con-nected converter:topology,parameter,and analysis[J]. IEEETransactions on Power Electronics,2015,30(9):5067.
[13]刘飞,查晓明,段善旭.三相并网逆变器LCL滤波器的参数设计与研究[J].电工技术学报,2010,25(3):110.LIU Fei,ZHA Xiaoming,DUAN Shanxu. Design and research onparameter of LCL filter in three-phase grid-connected inverter[J]. Transactions of China Electrotechnical Society,2010,25(3):110.