A study of instantaneous value control with voltage variation compensation for UPS inverters

A new approach for real time digital feedback control of PWM inverter is proposed, in which an instantaneous value control with voltage variation compensation is achieved. In this scheme, the sampling frequency of the inverter becomes half of the carrier frequency, and it is suitable to implement for higher carrier frequency. In this paper, the output characteristics of the inverter for various LC filter components are evaluated. Also the influence of the capacitor current feedback signal for the output characteristics are verified. From the view point of UPS applications, the advantages and disadvantages are discussed though simulations and experiments, the superiority of the proposed control law is verified.