A multifunction control scheme for current harmonic elimination and voltage sag mitigation using a three phase three level flying capacitor inverter

This paper presents a novel control scheme for a distribution static compensator (DSTATCOM) aimed at mitigating voltage sag at the Point of Common Coupling (PCC) or eliminating current harmonics of the load. The proposed control scheme uses the d-q reference frame for the decoupling of active and reactive current components. Furthermore a selective algorithm is integrated to the control scheme in order to choose between the voltage support mode or the current harmonics elimination mode. Finally, the DSTATCOM is based on a three phase three level flying capacitor topology. The proposed control scheme outperforms the conventional one due to the ability of the suggested control system to combine multiple functions, allowing DSTATCOM to respond in various power quality issues. The effectiveness of the proposed control scheme to enhance the multifunction ability of the DSTATCOM is verified via Matlab/Simulink (c) in both steady state and transient response. (C) 2012 Elsevier B.V. All rights reserved.