Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Conversor CA-CC bidirecional, Correção do fator de potência, estratégia de modulação, veículos elétricos

Resumo
Este artigo apresenta uma nova estratégia de modulação do conversor CA-CC monofásico bidirecional, isolado em alta frequência, de único estágio e com correção do fator de potência,destinado para aplicação como carregador de baterias embarcado de veículos elétricos. Os interruptores do lado primário do conversor operam sob a modulação por largura de pulso (PWM) senoidal, permitindo correção do fator de potência e transferindo a energia da rede elétrica a um barramento CC. Após o transformador, o lado secundário é composto por uma estrutura em ponte completa em que os interruptores são comandados em alta frequência com razão cíclica fixa de 50%. Para a transferência da energia armazenada do barramento CC primário para a saída emprega-se a técnica de deslocamento de fase (phase-shift), utilizada em conversores DAB. Desta forma são desenvolvidas análises teóricas e equacionamentos utilizando-se da nova modulação, sendo validadas por resultados experimentais com um protótipo de potência de 500 W, tensão de entrada de 127 V/ 60 Hz e tensão de saída de 300 V.

Title: NEW MODULATION STRATEGY APPLIED TO A SINGLE-PHASE AC-DC CONVERTER FOR APPLICATION IN GRID-TO-VEHICLE (G2V) AND VEHICLE-TO-GRID (V2G) MODES

Keywords: AC-DC bidirectional converter, Electric vehicles, modulation strategy, Power Factor Correction

Abstract
This paper presents a new modulation strategy for a single-phase single-stage isolated ac-dc converter with power factor correction intended for electric vehicle battery charger. The switches on the primary side of the converter operates under sinusoidal PWM modulation, providing power factor correction and transferring power from grid to a DC bus. After the transformer, the secondary side is composed of a full-bridge structure in which the switches are controlled by means of fixed PWM modulation with 50% duty-cycle. For transferring the stored energy from the primary DC bus to output of converter, the phase-shift technique is applied, used in DAB converters. Laboratory tests with a 500 W, 127 V/60 Hz input voltage and 300 V output voltage validate the theoretical analysis carried out.

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