Stability and Initial Estimation of Power Source Voltage Sensorless Single-Phase PWM AC/DC Converter

Abstract

The authors already proposed the new control scheme of the PWM converters where the control scheme was performed on the estimated voltage and phase of the source, thus eliminating the voltage sensor.
The paper deals with a stability problem of a sensorless PWM converter control. Under consideration of the parameter error, the stability analysis of the proposed control is examined. In addition to that, a design procedure of the estimation gains is also examined. For the stable starting of the system, the initial estimation of the amplitude and phase angle of the source voltage is proposed.
The effectiveness of the theoretical stability and estimation gain design has been confirmed by experiments.