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.
李芬, 邹旭东, 邹云屏, 石晶, 吴振兴, 王成智, 唐健. 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, Shi Jing, Wu Zhenxing, Wang Chengzhi, Tang Jian. Input Impedance Analysis of LCL-Filter PWM Rectifier Connected to Grid. Transactions of China Electrotechnical Society, 2010, 25(1): 97-103.
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2010, Vol. 25 
