Abstract：In the application of three phase photovoltaic gird-connected inverters, how to meliorate quality of grid current is an key issue concerned. Adopting LCL filter to connect inverters with grid brings about a good filtering effect, but it makes control complex. Considering existing control method, in this paper, a strategy that cascaded proportion integrity(PI)and proportion resonation (PR)with grid voltage feed forward based on dq synchronous rotate frame is proposed. The model of three phase inverter is founded and controller was analyzed and derived. This strategy meliorated the dynamic characteristics of connecting grid by feed forward, achieved zero error tracking using PI, and suppressed harmonics currents effectively via PR. Last, simulation and experiment on a 100kW PV array grid-connected inverter are done. The results show that this proposed strategy achieves smooth grid current starting and fewer harmonics current.
刘波, 杨旭, 孔繁麟, 叶海忠, 于虹. 三相光伏并网逆变器控制策略[J]. 电工技术学报, 2012, 27(8): 64-70.
Liu Bo, Yang Xu, Kong Fanlin, Ye Haizhong, Yu Hong. Control Strategy Study for Three Phase Photovoltaic Grid-Connected Inverters. Transactions of China Electrotechnical Society, 2012, 27(8): 64-70.
[1] Karshenas Hamid R, Saghafi Hadi. Basic criteria in designing lcl filters for grid connected converters[C]. IEEE International Symposium on Industrial Electronics, 2006: 1996-2000. [2] Liu Fei, Zhou Yan, Duan Shanxu, et al. Parameter design of a two-current-loop controller used in a grid-connected inverter system with LCL filter [J]. IEEE Transactions on Industrial Electronics, 2009, 56 (11): 4483-4491. [3] Teodorescu R, Blaabjerg F, Borup U, et al. A new control structure for grid connected LCL PC inverters with zero steady state error and selective harmonic compensation[C]. Applied Power Electronics Conference and Exposition, 2004: 580-586. [4] Jung Eunsoo, Sul Seung Ki. Implementation of grid-connected single-phase inverter based on FPGA[C]. Applied Power Electronics Conference and Exposition, 2009: 889-893. [5] Timbus A V, Ciobotaru M, Teodorescu R, et al. Adaptive resonant controller for grid-connected converters in distributed power generation systems [C]. Applied Power Electronics Conference and Exposition, 2006: 1601-1606. [6] 赵清林, 郭小强, 邬伟扬. 单相逆变器并网控制技术研究[J]. 中国电机工程学报, 2007, 27(16): 60-64. Zhao Qinglin, Guo Xiaoqiang, Wu Weiyang. Research on control strategy for single-phase grid-connected inverter[J]. Proceedings of the CSEE, 2007, 27(16): 60-64. [7] Se Kyo Chung. A phase tracking system for three phase utility interface inverters[J]. IEEE Transactions on Industrial Electronics, 2000, 15 (3): 431-438. [8] Timbus A, Teodorescu R, Blaabjerg F, et al. Synchronization methods for three phase distributed power generation systems[C]. Power Electronics Specialists Conference, 2005: 2474-2481. [9] 王兆安, 黄俊. 电力电子技术[M]. 北京: 机械工业出版社, 2000. [10] Zhang Richard. High performance power converter systems for nonlinear and unbalanced load source[D]. Blackburg, Virginia: Faculty of the Virginia Polytechnic Institute and State University, 1998. [11] Shen Guoqiao, Zhu Xuancai, Chen Min, et al. A new current feedback PR control strategy for connected vsi with an LCL filters[C]. Applied Power Electronics Conference and Exposition, 2009: 1564-1569. [12] Chen Yun, Liu Fei. Design and control for three phase grid connected photovoltaic inverter with LCL filter[C]. IEEE Circuits and Systems International Conference on Testing and Diagnosis, 2009:1-4. [13] 沈国桥, 徐德鸿. LCL 滤波并网逆变器的分裂电容法电流控制[J]. 中国电机工程学报, 2008, 28(18): 36-41. Shen Guoqiao, Xu Dehong. Current control for grid-connected inverters by splitting the capacitor of LCL filter[J]. Proceedings of the CSEE, 2008, 28(18): 36-41.
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