Current sensors and power switches fault detection and compensation for shunt active power filters

This paper presents current sensors and power switches fault detection and compensation for shunt active power filters. Active filter topology is based on a redundant fault tolerant four-leg structure. Power switches fault detection is based on a new fast and reliable detection method. Current sensors fault is achieved by a direct current estimator associated with a logical decision. Simulation results demonstrate the effectiveness of detection, isolation and reconfiguration performances in fault cases of current sensors or switches.