Energy Shaping Repetitive Control (ESRC) for Three-Phase Three-Wire Shunt Active Power Filter

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. When the parameters of the line and load are uncertain or unknown, the system may be unstable. In order to solve this problem, this paper adopts the energy shaping repetitive control (ESRC) to improve the output current waveform of three-phase three-wire shunt active power filter. In this control strategy, the Energy Shaping control is used to guarantee system dynamic performance and the repetitive control is to correct current waveform quality. The new controller design procedure is analyzed in detail. Theoretical analysis and experimental results demonstrate the validity of the proposed method and the filtering performance is improved obviously.