Diseño e implementación de un convertidor dc/dc bidireccional para estabilización de nivel de voltaje en un bus dc mediante ultracapacitores

Abstract

In this work the study of one of the technologies currently emerging for the storage of energy such as ultracapacitors, its equivalent circuit and its characteristic curves is carried out. As well as the design and implementation of a bidirectional dc / dc converter that allows controlling the flow of energy to and from the ultracapacitors, using PID controllers that have been implemented in an embedded "STM32F407 Discovery" board, when it works as a buck or boost independently. By means of the bidirectional dc / dc converter, it is sought to obtain the characteristic curves of the ultracapacitor by applying the method of charge and discharge of ultracapacitors to constant current, as well as, stabilizing the voltage level in a dc bus. The applications of the bidirectional dc / dc converter were verified with values up to 26A for charge and discharge of ultracapacitors at constant current and Po = 430 W, Vo = 24V Vin = 13.5V for the method of stabilizing voltage level on a dc bus , using a frequency of f = 20kHz for both cases.