A Novel Reference Current Detection Algorithm (RCDA) in 9-Level PEC Converter-based Shunt Active Power Filter

In order to enhance the power quality of single-phase Active Power Filters (APFs), which are used as the interface between distributed generators and the electrical power distribution grid, a novel approach is put forward in this paper. An accurate Reference Current Detection Algorithm (RCDA) is proposed as a critical part of Shunt Active Power Filter (SAPF) control system for a nine-level Packed E-Cell (PEC9)-based SAPF (PEC9-SAPF). All unwanted components of load current are incorporated in the proposed Reference Current Detection Algorithm (RCDA). The proposed PEC9-based SAPF not only guarantees the excellent power quality at the grid side, but also holds all advantages of PEC multilevel converters. Also, the proposed RCD algorithm is assessed to verify its accuracy through considering the impact of critical components such as reactive and harmonics currents. Simulation Results confirm that the proposed PEC9-based SAPF is able to compensate the harmonic components of nonlinear load, produce low THD sinusoidal waveform for grid current, reach unity power factor, and balance the capacitor voltages for PEC9 converter.