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 converter. 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