Estudo, controle e modelagem do conversor dual active bridge (dab) para conexão no sistema elétrico de potência

Abstract

This work proposes to design, analyze and develop a bidirectional DC-DC converter to perform the interface between a renewable source (wind or solar for example) and a battery bank so that the power flow through this converter can be controlled. From the studies carried out, it was determined that the converter chosen for this application will be the Dual Active Bridge converter, which has high voltage gain, galvanic isolation and bidirectionality. Afterwards, a research was carried out with charge accumulators that would best adapt to the proposed application in addition to the charging method of the chosen accumulator, which was, respectively, Li-ion batteries and the constant current/voltage charging method. constant. After determining which converter best fits the proposed application, a more indepth study was carried out on the converter, analyzing operation stages as well as the equation in each stage. Afterwards, from the mathematical model of the linearization of the output current and voltage, the design of the current and voltage controllers of the output of the converter will be carried out and, similarly to the mathematical model of the linearization of the input current, the design of the input voltage. Once the controllers have been designed, they will be validated via simulation software, so that it can emulate what would be the behavior of the converter in practice and, finally, the experimental results of the converter operating in open and closed loop, that is, , first without the implementation of the control and with 500W rated load in forward flow mode and then, with half the rated load, in reverse flow. Afterwards, the current and voltage control in the direct mode and the voltage control in the reverse mode will be implemented, with steps being applied to the control variable of the converter in order to validate them and prove the correct functioning of the prototype.