Abstract：The compensation current tracking control for active power filter(APF) requires higher steady precision and better dynamic performance. In this paper, the deadbeat control is combined with repetitive control and advantages of the two controllers are utilized to realize the current loop control of the four-leg APF. Based on the four-leg APF mathematical model, the deadbeat control algorithm applied in the filter system is deduced. In order to avoid the defects of deadbeat control, a repetitive controller is introduced to eliminate periodic steady-state error. The system stability is improved by setting a low-pass filter and a compensator. The design method of each part is analyzed. The experiment on a four-leg APF phototype was carried out to verify the proposed control strategy. The total harmonic distrotion(THD) values of three phase source currents after filtering reduce to 2.7%, 2.7%, and 2.8% from 16.9%, 27%, 26.7% respectively, and the root mean square value(rms) of the neutral current dropes to 0.17A from 1.58A. The results suggest that the proposed deadbeat control strategy with plug-in repetitive controller restrains harmonics and solves the unbalanced problem of three-phase system effectively, which can prove the effectiveness of the control strategy.
周娟, 秦静, 王子绩, 伍小杰. 内置重复控制器无差拍控制在有源滤波器中的应用[J]. 电工技术学报, 2013, 28(2): 233-238.
Zhou Juan, Qin Jing, Wang Ziji, Wu Xiaojie. Application of Deadbeat Control with Plug-in Repetitive Controller in Active Power Filter. Transactions of China Electrotechnical Society, 2013, 28(2): 233-238.
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