A unity power factor converter using the synchronous reference frame based hysteresis current control

In this paper, a high performance unity power factor rectifier-inverter structure is presented. A synchronous reference frame based hysteresis current control as inner loop and dc link voltage control as outer loop are adopted for the front-end rectifier. With the proposed control algorithm, the converter draws high quality sinusoidal supply currents and maintains good dc link voltage regulation under wide load variation, and even under unbalanced and nonsinusoidal supply voltage conditions. Theoretical results of its analysis are verified initially through digital simulation. Finally experimental results of a 1 kVA laboratory prototype system confirm the feasibility of the proposed technique