A new repetitive voltage compensation technique which generates high-quality sinusoidal output voltage from a single-phase PWM inverter used for uninterruptible power supplies (UPS) is described. A repetitive control technique eliminates the steady-state error in the distorted output voltage caused by cyclic loads such as rectifier and triac loads. The proposed PWM inverter system employs a microprocessor-based closed-loop digital feedback with a sinusoidal reference. The PWM pattern is determined at every sampling instant by the proposed new algorithm, implemented by a microprocessor using a set of detected output voltages and the reference signals through one cycle. The system bas low distortion and very fast response for ac phase-controlled loads.

No abstract

No abstract

No abstract