Abstract
This paper presents a comprehensive design and control strategy for a photovoltaic (PV) energy system. This system consists of a 2kW photovoltaic system, two converter circuit, a resistive load of 6ohm and battery storage. Resistive load and battery system is connected to a common DC bus. This scheme offered two Converter topologies; one is boost converter and another is DC / DC bidirectional converter. The boost converter is directly connected in series to the PV array whereas the bi-directional DC/DC converter (BDC) is connected to the battery. The boost converter is used to regulate the maximum power point tracking (MPPT) of the PV array. For MPPT from the solar array the Perturb & Observe method (P&O) is used. The bi-directional converter regulates battery charging and discharging power flow. When the generated PV power is less than the required power for load the battery is discharging to fed the load to meet the demand. On the other hand, when the generated power of the PV array is more than the demand the battery is charging. Closed-loop control of bi-directional controller is implemented with two control schemes with two controllers. Scheme 1. Proportional Integral controller and scheme 2. Takagi-Sugeno Fuzzy controller. The paper deals with the comparative analysis of battery management in terms of charging-discharging, rise time, overshoot, undershoot, peak value, peak time.
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