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In this paper, a new current control strategy combining repetitive control with PI control was proposed to improve the accuracy of three-phase four wire active power filter (APF). The parameters selection and the stability error of the proposed current controller were analyzed according to the transfer function. A performance comparison between the proposed controller and the traditional PI controller...
As a result of three-phase voltage of non-ideal power distortion and asymmetric, containing a large number of negative sequence components, traditional ip-iq method which detect harmonic currents will have error, so the positive sequence voltage component of A phase need be extracted. Improved instantaneous symmetrical components structures the rotary phases without delay by using of instantaneous...
According to the active power balance principle, the paper analyzed the approximate mathematical model of APF. In order to optimize the control effect of DC bus voltage in APF, PID control method based on improved BP neural network is adopted to do closed-loop control to the system. The two strategies, adding momentum method and adaptive learning rate adjustment, are combined to improve BP network,...
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