Single-Phase High Power Factor PWM Converter without Source Phase Angle and Voltage Detectors

Abstract

In this paper, the authors propose a current control system of a single-phase PWM AC/DC converter which eliminates detectors of the source phase angle and voltage. The sinusoidal input current and unity effective power factor are realized based on the estimated source voltage in the controller. The feature of the proposed estimation algorithm is that the estimations of the phase angle and crest value of the source voltage are independent each to each. The estimations are performed based on the current error between the actual and model currents. The orthogonal and in-phase components of the current error with respect to the estimated phase angle are proportional to the phase angle and crest value errors, respectively. Therefore, the estimations of them can be realized by feeding back the corresponding components of the current error.
The effectiveness of the proposed current control system was confirmed by experiments. The stable estimation and control were achieved.