DC to DC Bidirectional Converter by using TS-Fuzzy Controller for PV System

Abstract

Photovoltaic Systems (PVSs) are commonly used to produce electricity for various applications. The solar irradiances will not be constant on every time, it will be always fluctuating and changing. Many PV modules need to be managed in the combination of parallel and series to meet load requirement at rated voltage. In order to harvest maximum energy from PV modules, it must be worked at particular voltage which is related to maximum power location. Generally a boost converter is associated to work as a maximum power point tracker (MPPT) device with help of perturb and observe (P&O) mechanism. A battery bank is incorporated to form a dc-link to store the energy from PV to be utilized whenever it is required. Therefore, a dc to dc bidirectional device is placed to regulate the discharging and charging process of batteries. Compared to PI and conventional Fuzzy controllers, Takagi Sugeno-Fuzzy (TS-Fuzzy) controllers are able to generate accurate response quickly under rapid changes of solar irradiance. Therefore, TS-Fuzzy controller based control method for the dc to dc circuit is implemented in this paper. The P&O algorithm is also integrated to control mechanism of a dc to dc bidirectional circuit. Hence no need of an extra circuit for working as MPPT circuit. Hardware – in the – Loop (HIL) is developed by using OPAL-RT units to analyze various results in this paper.