Control of power supply unit for military vehicles based on four-leg three-phase VSI with proportional-resonant controllers

This paper deals with the control of the output part of a power electronics converter, which we have designed for a diesel-electric power supply unit for military applications. The output part of the unit is composed of a four-leg three-phase voltage source inverter and a sinusoidal filter. The output part of the power supply unit with help of proposed control system allows to create three-phase symmetrical sinusoidal output voltage under arbitrary load condition (1-phase, 3-phase, linear, non-linear, symmetrical, unsymmetrical) with minimum output voltage distortion. The employed control is based on a set of proportional-resonant (PR) controllers. Behaviour of designed converter has been verified by simulation results as well as by experiments performed on designed laboratory prototype of rated power of 18 kVA.