Shunt active power filter for energy quality improvement in distributed generation systems

This paper presents an application of a shunt active power filter (SAPF) for energy quality improvement in a power system composed of nonlinear loads and distributed wind generation. The control of SAPF is implemented without harmonic detection schemes and by linear quadratic regulators with integral action. The performance of the SAPF is evaluated by the current total harmonic distortions and the power factor at the point of common coupling of the power system. The analysis of non-active powers compensation is based on the instantaneous power theory concepts. The control system uses only the power grid currents and voltages measurements, and DC-link voltage of the SAPF. The validation of the control strategy is done through computational simulations implemented in the PSCAD/EMTDC software