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| Modelling and Stability Analysis of Direct Output Current Control for LCL Interfaced Grid-Connected Inverters |
| Guo Xiaoqiang, Wu Weiyang, Gu Herong, Wang Liqiao, Zhao Qinglin |
| Yanshan University Qinhuangdao 066004 China |
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Abstract Instability phenomenon exists in practical applications of the direct output current control for LCL interfaced grid-connected inverters. In order to clarify its nature, the system control linear model is developed, and the characteristic equations are deduced. Based on the Routh-Hurwitz stability criterion, a significant conclusion is reached that instability is unavoidable whatever P, PI or PID control is used. A straightforward solution is to put resistors in series with the LCL filter so as to increase the phase margin and improve the system stability. The relationship between resistances, control parameters and stability margins is analyzed and quantified precisely. Finally, the influence of nonlinear factors such as the switching and over modulation saturation on the validity of conclusions is discussed.
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Received: 21 November 2008
Published: 04 March 2014
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[1] Frede Blaabjerg, Zhe Chen, Soeren Baekhoej Kjaer. Power electronics as efficient interface in dispersed power generation systems[J]. IEEE Transactions on Power Electronics, 2004, 19(5): 1184-1194.
[2] Xue Y, Chang L, Kjaer S B, et al. Topologies of single-phase inverters for small distributed power generators: an overview[J]. IEEE Transactions on Power Electronics, 2004, 19(5): 1305-1314.
[3] Bruno Bolsens, Karel Brabandere, Jeroen Keybus, et al. Model-based generation of low distortion currents in grid-coupled PWM-inverters using an LCL output filter[J]. IEEE Transactions on Power Electronics, 2006, 21(4): 1032-1040.
[4] Dixon J W, Ooi B T. Indirect current control of a unity power factor sinusoidal current boost type three- phase rectifier[J]. IEEE Transactions on Industry Electronics, 1988, 35(4): 508-515.
[5] Hyosung Kim, Taesik Yu, Sewan Choi. Indirect current control algorithm for utility interactive inverters in distributed generation systems[J]. IEEE Transactions on Power Electronics, 2008, 23(3): 1342-1347.
[6] Kazmierkowski M P, Malesani L. Current control techniques for three-phase voltage-source PWM converters: a survey[J]. IEEE Transactions on Industry Electronics, 1998, 45(5): 691-703.
[7] Marco Liserre, Frede Blaabjerg, Steffan Hansen. Design and control of an LCL-filter-based three-phase active rectifier[J]. IEEE Transactions on Industry Applications, 2005, 41(5): 1281-1291.
[8] Tusitha Abeyasekera, Johnson C Mark, Atkinson David J. Suppression of line voltage related distortion in current controlled grid connected inverters[J]. IEEE Transactions on Power Electronics, 2005, 20(6): 1393-1401.
[9] Prodanovic M, Green T C. Control and filter design of three phase inverters for high power quality grid connection[J]. IEEE Transactions on Power Electronics, 2003, 18(1): 373-380.
[10] Erika Twining, Donald Grahame Holmes. Grid current regulation of a three-phase voltage source inverter with an LCL input filter[J]. IEEE Transactions on Power Electronics, 2003, 18(3): 888- 895.
[11] 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.
[12] 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.
[13] Wiseman Jason, Wu Bin. Active damping control of a high-power PWM current-source rectifier for line-current THD reduction[J]. IEEE Transactions on Industry Electronics, 2005, 52(3): 758-764.
[14] Dong P Gan, Olorunfemi Ojo. Current regulation in four-leg voltage-source converters[J]. IEEE Transactions on Industry Electronics, 2007, 54(4): 2095-2105. |
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2010, Vol. 25 
