Comparação entre Perturba & Observa e Correlação de Ripple no Rastreamento do Ponto de Máxima Transferência de Potência em Sistema de Transmissão de Energia Sem Fio

Abstract

In this work, an inductive power transfer system (IPT) was implemented, using a 5V source that supplies power to a 22Ω resistive load. Wireless power transmission, although proposed in the second half of the 19th century, has only in recent years reached wide use. In the assembly performed, a microcontroller was used to drive and control the inverter that feeds a primary coil while another microcontroller is allocated on the secondary side of the circuit. The microcontrollers communicate via Wi-Fi performing power control on the load. At first, the prototype was subjected to tests to generate power and efficiency curves, as function of the inverter frequency and the distance between the coils. With these curves it was possible to identify if the separation phenomenon occurs in the prototype as well as to determine the expected practical results of MPPT. In the second moment, the Perturba & Observe (P&O) and Ripple Correlation Control (RCC) techniques were tested in the prototype in search of the MPP and compared with the results previously obtained. The implementation of the P&O technique proved to be simpler than the RCC from the point of view of the mathematical adaptation necessary for implementation in IPT, considering that they were used as a basis for the implementation of both in other applications consulted in the literature. As for the practical results, the control with P&O showed less power oscillation during the tests when compared with RCC. Even so, it appears in the literature that there is an opportunity to implement adjustments in the RCC algorithm in future works to improve its performance.