Digital control of three phase PWM inverter with L-C filter

Abstract

An algorithm for digital control of a three-phase sinusoidal voltage inverter having an output L-C filter has been developed. The transient of the L-C filter during the discretization time has been taken into account by discretizing the fourth-order matrix state equation of the current and the voltage of the d-q frame and precise discrete equations of the inverter have been introduced. Using these equations, a deadbeat controller consisting of a d-q current minor loop and a d-q voltage major loop, with precise decoupling of the d-q components, has been developed.<>