A comprehensive control strategy for an asymmetric multilevel Shunt Active Power Filter

A comprehensive control strategy to simultaneously compensate both reactive power and current harmonics is presented for a multilevel Shunt Active Power Filter. The proposed topology is built-up upon asymmetric modules that are meant to independently provide fundamental reactive power compensation and unwanted harmonics cancellation. Therefore, the control objectives are synthesized with different specialized modules, which require dedicated control strategies to obtain the required performance. The presented approach takes advantage of the superposition principle that allows the independent design of all the controllers. Simulated preliminary static and dynamic results confirm the correct unified operation of the proposed control strategy.