A sliding mode control method of dc-link capacitor voltage used in active power filter

a new dc-link voltage controller of a shunt active power filters is proposed in this paper. A fixed and regulated dc-link voltage is necessary to improve dynamic response of shunt active power filter. The dc-link voltage regulation is done by a sliding mode control method. Comparison made between the proposed controller and conventional PI regulator that used for dc-link voltage regulation. In this paper, a selective PI-resonant current controller with indirect scheme is employed to compensate load harmonic currents and reactive power in active power filter. The presented control method compensates the source current without measurements of the loads and active filter currents. In this method, the compensation signals are obtained by regulating the source currents. The performances of the proposed dc-link controller and current control scheme were verified through a simulation with MATLAB.