Analysis of PI controller shunt APF using PSCAD for single phase nonlinear load

The widespread usage of power electronic in the end-user had increased the harmonic generation at the distribution level. Conventional, Passive Power Filter (PPF) is used to improve the power quality. However, in practice, there are several drawbacks to this filter. Therefore, Active Power Filter (APF) became a better solution to reduce harmonic distortion. APF will produce a compensation current to reduce the harmonic generated by the nonlinear load. This paper presents a PI controller shunt APF for the single-phase system. The control system requires sensing the source current and DC-link voltage. The feedback control at voltage control loop will use to maintain the DC-link voltage and to avoid the error due to offset in the Integrator. The designed shunt APF is simulated by using PSCAD/EMTDC with a nonlinear load. The simulations show that the control scheme presented here possesses good results proving the excellent behaviour of this APF.