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| Input Impedance Analysis of LCL-Filter PWM Rectifier Connected to Grid |
| Li Fen, Zou Xudong, Zou Yunping, Shi Jing, Wu Zhenxing, Wang Chengzhi, Tang Jian |
| Huazhong University of Science and Technology Wuhan 430074 China |
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Abstract Due to better attenuating current harmonics around switching frequency injected to the grid, L-filter is substituted by LCL-filter in grid connection of PWM rectifier. However, because of the resonance phenomenon of LCL-filter, it may bring stability problems in the current loop. In order to overcome them, a control strategy applying the filter-capacitor current feedback in the current loop is proposed to achieve the function of damping resistor. Then, the input impedance integrated the controller with the LCL-filter parameters in high frequency region is modeled and analyzed by the frequency responses of the transfer functions models, including the consumer mode and the power feedback mode. Also, the influence of the disturbance of point of common coupling (PCC) voltage is studied. Finally, the simulation and experiment tests show that LCL-filter is effective to reduce the switching frequency pollution emitted in the grid, the proposed control strategy is feasible to solve the resonance problem of the LCL-filter, and it’s easy to achieve power feedback operation under small power with PCC voltage feed forward.
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Received: 11 December 2008
Published: 04 March 2014
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[1] Rodriguez J R, Dixon J W, Espinoza J R, et al. PWM regenerative rectifiers: state of the art[J]. IEEE Trans. on Industrial Electronics, 2005, 52(1): 5-22.
[2] 张崇巍, 张兴. PWM整流器及其控制[M]. 北京: 机械工业出版社, 2003.
[3] 赵仁德, 贺益康, 刘其辉. 提高PWM 整流器抗负载扰动性能研究[J]. 电工技术学报, 2004, 19(8): 67-72.
[4] 陈瑶, 金新民, 童亦斌. 三相电压型PWM 整流器网侧LCL 滤波器[J]. 电工技术学报, 2007, 22(9): 124-129.
[5] Marco L, Frede B, Steffan H. Design and control of an LCL-filter-based three-phase active rectifier[J]. IEEE Trans. on Industry Applications, 2005, 41(5): 1281-1290.
[6] Blasko V, Kaura V. A novel control to actively damp resonance in input LC filter of a three-phase voltage source converter[J]. IEEE Trans. on Industry Application, 1997, 33(2): 542-550.
[7] Dahono P A. A control method to damp oscillation in the input LC filter of AC-DC PWM converters[C]. IEEE PESC’02, 2002: 1630-1635.
[8] 张宪平, 林资旭, 李亚西, 等. LCL滤波的PWM整流器新型控制策略[J]. 电工技术学报, 2007, 22(2): 74-77.
[9] Teodorescu R, Blaabjerg F, Marco L, et al. A stable three-phase LCL-filter based active rectifier without damping[C]. Proc. IEEE IAS’03, 2003: 1552-1557.
[10] Marco L, Antonio D A, Blaabjerg F. Genetic algorithm based design of the active damping for a LCL-filter three-phase active rectifier[J]. IEEE Trans. on Power Electronics, 2004, 19(1): 76-86.
[11] Fei L, Duan S H, Chen G Q, et al. Design and control of three-phase PV grid connected converter with LCL filter[C]. Proc. IEEE IECON’07, 2007: 1656-1661.
[12] Twining E, Holmes D G. Grid current regulation of a three-phase voltage source inverter with an LCL input filter[C]. Proc. IEEE PESC’02, 2002: 1189-1194.
[13] Enslin J H R, Heskes P J M. Harmonic interaction between a large number of distributed power inverters and the distribution network[J]. IEEE Trans. on Power Electronics, 2004, 19(6): 1586-1593.
[14] Takeshita T, Matsui N. Current waveform control of PWM converter system for harmonic suppression on distribution system[J]. IEEE Trans. on Industrial Electronics, 2003, 50(6): 1134-1139.
[15] Ryckaert W R, De Gusseme K, Van de Sype D M, et al. Damping potential of single-phase bidirectional rectifiers with resistive harmonic behaviour[J]. IEE Proceedings: Electric Power Applications, 2006, 153(1): 68-74. |
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2010, Vol. 25 
