High Performance Single-Phase Voltage Regulator with a Simple Circuit Topology

This paper proposes a novel high performance single-stage voltage regulator to give high input power factor and low current distortion on the rectifier side and provide clean and stable ac voltage on the inverter side. The proposed voltage regulator only employs four switches to perform the power factor correction in input side and provide regulation of the output ac voltage magnitude. Thus, its cost is lower than the others. It has a common arm between the rectifier and inverter, and adopts an appropriate switching strategy. A significant reduction in the conduction losses is achieved, since the rectifier in the proposed converter uses a single converter instead of the conventional configuration composed of a four-diode front- end rectifier followed by a boost converter. An average- current-mode control is employed in the rectifier side of proposed converter to synthesize a suitable low harmonics sinusoidal waveform for the input current. The sinusoidal pulse-width modulation (SPWM) control strategy is employed in the inverter of proposed converter to achieve well dynamic regulation. A design example of 1000 W single- phase voltage regulator is examined to assess its performance.