Flying capacitor multilevel inverter based shunt active power filter with trifling susceptibility to divisional voltages deregulation

Due to increasing utilization of shunt active power filter (APF) in power systems, necessarily it has to be effective and reliable as much as possible. In this paper to enjoy of multilevel inverter advantages in active filtering task, a shunt APF based on flying capacitor multilevel inverter is presented. The power section of this active filter is viewed as analog to digital converter; as a result a multilevel Sigma-Delta modulation control can be utilized to control power section of APF aimed at reducing sensitivity to flying capacitor voltage deregulation and improving modulator performance. In control section of this APF, perfect harmonic cancellation (PHC) method which is capable of correct action under any condition of use, is exploit. Simulation studies are performed using PSCAD/EMTDC^® to validate proposed APF performance.