Improving power quality using a new single phase multilevel active power filter

This paper proposes a Single Phase Multilevel Active Power Filter (SPMAPF) for harmonic elimination and reactive power compensation. An asymmetric neutral point clamped five level inverter is used as an active power filter to improve power quality at Point of Common Coupling (PCC). The control algorithm of the SPMAPF is based on Lyapunov candidate. An energy-based Lyapunov control strategy is developed and tested for the SPMAPF. This method determines the control law that makes the derivative of the Lyapunov function always negative for all values of the states. Simulation results that are obtained by using Simulink/Matlab environment are presented to confirm the good effectiveness of the proposed control technique.