Inversor de tensão com controlador de ação repetitiva e “pd-feedforward” embarcado em FPGA

Abstract

The research developed herein is based on the applied use of a FPGA to the area of Power Electronics. The authors developed a single-phase DC/CA inverter control with an LC output filter controlled by a unipolar sine wave PWM, which uses as its load a non-controlled rectifier. The implemented control, which integrates the repetitive control actions and PD-Feedforward, was embedded in FPGA, along with the functions of reference voltage generation, triangular carrier generation and digital PWM, digital comparison for protection and mathematical operations in multiple type fixed point and accumulations for digital functions. A part of these functions was implemented through the software using high level abstraction, and the other part was implemented using low level abstraction through the hardware description language. This research study aims at showing the feasibility of applying FPGAs in Power Electronics, as an alternative to DSPs for converter control by performing the calculation for the control laws in fixed point, and not only for the substitution of digital circuits. This is a novel research project here at NUPEP (Núcleo de Pesquisa em Eletrônica de Potência) (Power Electronics research center)) at the electrical engineering faculty of the Federal University of Uberlandia. Therefore, this is an initial research project into the use of FPGA in the area of Power Electronics at NUPEP.