Análise desenvolvimento de um novo conversor CA-CC híbrido monofásico com controle digital baseado em DSP

Abstract

This work presents the development and the experimental analysis of a new single-phase hybrid rectifier with high power factor (PF) and low harmonic distortion of current (THDI), suitable for high power application. The proposed structure is composed by an ordinary single-phase diode rectifier with parallel connection of a switched converter. It is outlined that the switched converter is capable of composing the input line current waveform assuring high PF and low THDI. However, the power rating of the switched converter is lesser than 50% of the total output power, assuring robustness and reliability for the proposed hybrid rectifier. Two prototypes rated at 1 kW and 10 kW were developed and analyzed in laboratory, using digital control technique. A PWM control strategy was implemented imposing quasi-sinusoidal line input current waveform and limiting the switched converter power contribution. It was found that the line input current harmonic spectrum is in accordance with the harmonic limits imposed by IEC61000-3-2 and IEC61000-3-4. The principle of operation, the mathematical analysis, and experimental results from a 1 kW and 10 kW prototypes are also presented in this work.