Two fault tolerant control strategies for shunt active power filter systems

This paper shows how to integrate fault detection, fault identification and fault compensation into two different types of fault tolerant active power filter systems. These proposed strategies can compensate the open-circuit and short-circuit failures occurring in the power converter devices used on active power filter systems. The fault compensation is achieved by reconfiguring the power converter topology by using isolating and connecting devices. These devices are used to redefine the post-fault converter topology. This allows for continuous free operation of the system after isolation of the faulty power switches of the converter. Experimental results demonstrate the validity of the proposed fault tolerant control strategies.