Voltage regulator with a few switches and a digital control system

The paper considers a new three-phase AC voltage regulator with a few switches. The proposed converter is buck-boost with sinusoidal input and output currents. A calculating method of AC voltage regulator currents using the highest harmonics is proposed. Dependences of harmonic coefficients on the modulation depth were obtained using the ADE method, and the results were compared to the simulation results. The evaluation of the output and input currents quality relative to the switching frequency allowed choosing the optimal frequency range for the experimental layout. The digital control system of the AC voltage regulator with a small number of switches, which is based on the Atmel AVR Atmega microcontroller, was reviewed and analyzed. The paper also presents the diagrams of currents and voltages of the regulator with a digital control system obtained during the experiment.