SLIDING MODE CONTROL OF A SHUNT ACTIVE POWER FILTER WITH INDIRECT CURRENT MEASUREMENT

The main objective of this work is to investigate an indirect current control scheme based on slide mode approach to regulate the currents of a three-phase Active Power Filter (APF) in such a way to improve the quality of the power supplied by a diesel generator set. The indirect current control scheme provides the signal reference to active power filter controller without the need of measurement of the load currents. A sliding mode controller is designed in the inner control loop to assure the APF tracks the reference signals with a small amplitude error and a short time delay. A space vector modulation is used to generate the switching pattern for the voltage source converter. Simulation results are presented to validate the proposed control scheme.