Abstract：This paper presents a cascading nonlinear controller that applies to the grid-connected converter with LCL filters, based on linearization control. Herein, on the basis of an affine nonlinear model of three-phase grid-connected converter with LCL filter, the active and reactive currents of the converter at grid side and converter side are controlled with global linearization, through decoupling exaction from nonlinear feedback linearization controller. Consequently, the active damping of the filter is obtained. The cascading nonlinear controller removes the resonance of LCL filters and promotes the control performance of the converter effectively. Simulation and experimental results show the validation and feasibility of the proposed strategy.
[1] Loh P, Holmes D. Analysis of multiloop control strategies for LC/CL/LCL-filtered voltage-source and current-source inverters[J]. IEEE Transactions on Industrial Applications, 2005, 41(2): 644-654. [2] 李欣然, 郭希铮, 王德伟, 等. 基于LCL滤波的大功率三相电压型PWM整流器[J]. 电工技术学报, 2011, 26(8): 79-84. Li Xinran, Guo Xizheng, Wang Dewei, et al. Research and development of high-power three-phase voltage source PWM rectifier with LCL filter[J]. Transa- ctions of China Electrotechnical Society, 2011, 26(8): 79-84. [3] Twining E, Holmes D. Grid current regulation of a three-phase voltage source inverter with an LCL input filter[J]. IEEE Transactions on Power Electro- nics, 2003, 18(3): 888-895. [4] Liserre M, Blaabjerg F, Hansen S. Design and control of an LCL-filter-based three-phase active rectifier[J]. IEEE Transactions on Industry Applications, 2005, 41(5): 1281-1291. [5] Dannehl J, Fuchs F W, Hansen S, et al. Investigation of active damping approaches for PI-based current control of grid-connected pulse width modulation converters with LCL filters[J]. IEEE Transactions on Industrial Applications, 2010, 46(4): 1509-1517. [6] 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. [7] Dannehl J, Wessels C, Fuchs F W. Limitations of voltage-oriented PI current control of grid-connected pwm rectifiers with filters[J]. IEEE Transactions on Industrial Electronics, 2009, 56(2): 380-388. [8] Yin Jinjun, Duan Shanxu, Liu Bangyin. Stability analysis of grid-connected inverter with LCL filter adopting a digital single-loop controller with inherent damping characteristic[J]. IEEE Transactions on Industrial Informatics, 2013, 9(2): 1104-1112. [9] Malinowski M, Bernet S. A simple voltage sensorless active damping scheme for three-phase PWM converters with an LCL filter[J]. IEEE Transactions on Industrial Electronics, 2008, 55(4): 1876-1880. [10] 李芬, 邹旭东, 邹云屏, 等. 并网LCL滤波的PWM整流器输入阻抗分析[J]. 电工技术学报, 2010, 25(1): 97-103. Li Fen, Zou Xudong, Zou Yunping, et al. Input impedance analysis of LCL-filter PWM rectifier connected to grid[J]. Transactions of China Electro- technical Society, 2010, 25(1): 97-103. [11] Cheng Daizhan, Hu Xiaoming, Shen Tielong. Analysis and design of nonlinear control systems[M]. Heidelberg: Science Press & Springer, 2010: 279-306. [12] 乐江源, 谢运祥, 张志, 等. 三相有源电力滤波器精确反馈线性化空间矢量PWM复合控制[J]. 中国电机工程学报, 2010, 30(15): 32-39. Le Jiangyuan, Xie Yunxiang, Zhang Zhi, et al. Space vector PWM control of three-phase active power filter using exact feedback linearization[J]. Pro- ceedings of the CSEE, 2010, 30(15): 32-39. [13] Kim D E, Lee D C. Feedback linearization control of three-phase UPS inverter systems[J]. IEEE Transa- ctions on Industrial Electronics, 2012, 57(3): 963-968. [14] Xia Changliang, Geng Qiang, Gu Xin, et al. Input- output feedback linearization and speed control of a surface permanent-magnet synchronous wind generator with the boost-chopper converter[J]. IEEE Transa- ctions on Industrial Electronics, 2012, 59(9): 3489- 3500. [15] Mahmud M A, Pota H R,Hossain M J, et al. Robust partial feedback linearizing stabilization scheme for three-phase grid-connected photovoltaic systems[J]. IEEE Journal of Photovoltaics, 2014, 4(1): 423-431. [16] Sehirli E, Altinay M. Input-output linearization control of three-phase voltage source PWM rectifier using L and LCL filter[C]. 45th International Univer- sities Power Engineering Conference, Wales, UK, 2010: 1-6. [17] Kim D, Lee D. Feedback linearization control of three-phase AC/DC PWM converters with LCL input filters[C]. 7th International Conference on Power Electronics, Daegu, Korea: EXCO, 2007: 766-771. [18] 张兴, 张崇巍. PWM整流及其控制[M]. 北京: 机械工业出版社, 2011.
2015, Vol. 30 
