Controladores resonantes para el control de tensión e inyección de corriente de falla en inversores para UPS

A control strategy for PWM inverters used in double conversion UPS systems is proposed. The objectives of this control strategy are to control the inverter output voltage to comply with performance specification given by standards, and control the inductor current to achieve short-circuit and overload protection. The control strategy is composed by two feedback loops, where the inner current loop uses multiple resonant controllers plus a state feedback controller, and in the outer voltage control loop multiple resonant controllers nested with a proportional controller. The proposal is validated by experimental results of a 2kVA single-phase PWM inverter.