Active Power Filter (APF) is usually used to compensate the harmonic and reactive currents which are generated by the nonlinear load, and its compensation performance mainly depends on the design of controller. This paper mainly analyzes that the compensation ability of digital PI control is limited, and a multiple control system based on digital PI control and digital repetitive control is proposed for digital PI control. According to the simulation and experiment of the proposed multiple control, it can be substantiated that the proposed multiple control has good steady performance and good dynamic performance as well.
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