Key Laboratory of Radar Imaging and Microwave Photonics (Nanjing Univ. Aeronaut. Astronaut.), Ministry of Education, Nanjing University of Aeronautics and Astronautics Nanjing 210016 China
Abstract：Flyback grid-connected micro-inverter has the defects of larger current ripple, larger phase difference of grid-connected current and smaller output power. To solve these problems, A novel single-stage forward grid-connected micro-inverter topology and algorithm is proposed in this paper. The drain-source voltage of the switch is clamped and the core of Transformer is reset with the help of the two transistor forward circuit. A LCD clamping circuit was used to achieve zero voltage switching (ZVS) turning-on of the switch and increase efficiency of the inverter. A L filter was used in output, so the phase of grid-connected current is not different with grid voltage. In-depth analysis was given on the inverter principles and the phase difference of grid connected current. Finally, simulation results and experimental results were given.
[1] Chiu H, Lo Y, Yang C et al. A Module-Integrated Isolated Solar Microinverter[J]. IEEE Transactions On Industrial Electronics, 2013, 60(2): 781-788. [2] 嵇保健, 洪峰. 半周控制双Buck-Boost单级逆变器[J]. 电工技术学报, 2011, 11:53-60. Ji Baojian, Hong Feng. Half Load-cycle worked dual buck-boost single-stage inverter[J]. Transactions of China Electrotechnical Society. 2011, 11:53-60. [3] 周玉斐, 黄文新. 耦合电感单级升压逆变器[J]. 中国电机工程学报, 2011, 31(33): 61-67. Zhou Yufei, Huang Wenxin. A novel single-stage boost inverter with coupled inductors[J]. Proceedings of the CSEE, 2011, 31(33): 61-67. [4] Baoming G, Haitham A, Zheng P et al. An energy- stored quasi-z-source inverter for application to photovoltaic power system[J]. IEEE Transactions On Industrial Electronics, 2013, 60 (10): 4468-4481. [5] 汤雨, 谢少军, 张超华. 改进型Z源逆变器[J]. 中国电机工程学报, 2009, 29(30): 28-34. Tang Yu, Xie Shaojun, Zhang Chao-hua. Improved Z-source Inverter[J]. Proceedings of the CSEE, 2009, 29(30): 28-34. [6] 蔡春伟, 曲延滨, 盛况. 增强型Z源逆变器[J]. 中国电机工程学报, 2009, 31(增刊): 259-266. Cai Chunwei, Qu Yanbin, Sheng Kuang. Enhanced Z-source Inverters[J]. Proceedings of the CSEE 2009, 31(增刊): 259-266. [7] 周玉斐, 黄文新, 赵健伍等. 抽头电感准Z 源逆变器[J]. 中国电机工程学报, 2012, 32(27): 126-134. Zhou Yufei, Huang Wenxin, Zhao Jianwu et al. Tapped Inductor Quasi-Z-source Inverters[J]. [8] Nanakos A, Tatakis E, Papanikolaou N. A weighted- efficiency-oriented design methodology of flyback inverter for AC photovoltaic modules[J]. IEEE Transac- tions On Power Electronics, 2012, 2(7): 3221-3233. [9] 丰瀚麟, 肖华锋, 谢少军等. 反激型电流源高频环节光伏并网逆变器研究[J], 电力电子技术, 2009, 43(12): 43-45. Feng Hanlin, Xiao Huafeng, XIE Shaojun et al. Research on flyback-type current source inverter for grid-connected photovoltaic systems[J]. Power Elec- tronics, 2009, 43(12): 43-45. [10] Rodriguez L, Balda J. A Comparison of Isolated DC-DC Converters for Microinverter Applications[C]. 2013 28th Annual IEEE Applied Power Electronics Conference and Exposition (APEC 2013), 2013: 2084-2091. [11] Mukherjee A, Pahlevaninezhad M, Moschopoulos G. A passive snubber circuit for flyback microi-nverters in solar energy systems[C]. 2013 28th Annual IEEE Applied Power Electronics Conference and Exposition (APEC 2013), 2013: 3236-3240. [12] 陈亚爱, 张卫平, 张东辉, 等. 新型MH 灯用单级逆变器[J]. 电工技术学报, 2009, 23(8): 74-79. Chen Yaai, Zhang Weiping, Zhang Donghui, et al. Study of a novel single stage inverter for MH lamps[J]. Transactions of China Electrotechnical Society. 2009, 23(8): 74-79. [13] Liu Zhen, Wang Wen-Jiang, Wei Hai-Cheng. A Novel ZVS Double Switch Flyback Inverter and Pulse Controlled Dimming Methods for Flat DBD Lamp[J]. IEEE Transactions On Consumer electronics, 2011, 57(3): 995-1002. [14] 薛必翠, 丁新平, 张承慧, 张民. 准Z源逆变器交流调速系统及部分PAM/PWM控制策略[J]. 电工技术学报, 2012, 10:142-149. Xue Bicui, Ding Xinping, Zhang Chenghui, et al. Quasi-Z-Source inverter adjustable speed drives system and its partly PAM/PWM control strategy[J]. Transactions of China Electrotechnical Society. 2012, 10:142-149. [15] Li Y, Ramesh O. A Low Cost Flyback CCM Inverter for AC Module Application[J]. IEEE Transactions On Power Electronics, 2012, 27(3): 1295-1303. [16] Ryu D, Kim Y, Kim J et al. Interleaved active clamp flyback inverter using a synchronous rectifier for a photovoltaic AC module system[C]. 8th International Conference on Power Electronics - ECCE Asia, 2011: 2631-2636. [17] Zhiliang Zhang, Xiao-Fei He, Yan-Fei Liu. An optimal control method for photovoltaic grid-tied- interleaved flyback microinverters to achieve high efficiency in wide load range[J]. IEEE Transactions on Power Electronics, 2013, 28(11): 5074-5087. [18] Kim Y, Ji Y, Kim J et al. A New Control Strategy for Improving Weighted Efficiency in Photovoltaic AC Module-Type Interleaved Flyback Inverters[J]. IEEE Transactions On Power Electronics, 2013, 28(6): 2688-2699. [19] Hamza D, Qiu M, Jain P. Application and stability analysis of a novel digital active EMI filter used in a grid-tied PV microinverter module[J]. Ieee Transactions On Power Electronics 2013, 28(6): 2867-2874. [20] Wang J. B, Wu J. H, David K. Injection current phase lag effect of the flyback inverter[C]. 2011 6TH IEEE Conference On Industrial Electronics And Applications (ICIEA), 2011: 1803-1808. [21] Qiong Mo, Min Chen, Zhe Zhang et al. Digitally- controlled active clamp interleaved flyback converters for improving efficiency in photovoltaic grid- connected micro-inverter[C]. 2012 IEEE Applied Power Elec- tronics Conference and Exposition -APEC, 2012: 555-562. [22] Qiong Mo, Min Chen, Zhe Zhang et al. Research on a Non-complementary Active Clamp Flyback Converter with Unfolding DC-AC Inverter for Decentralized Grid-connected PV Systems[C]. 2011 IEEE Energy Conversion Congress And Exposition (ECCE), 2011: 2481-2487.
2015, Vol. 30 
