Photovoltaic panel based design and simulation of the battery charge/discharge circuit

The battery charge/discharge circuits require direct current (DC). Power converters are used to obtain direct current in grid connected circuits. The most commonly used type of power converter is the AC/DC converter circuits. But, these circuits cause power quality disturbance and harmonics in energy systems. In this thesis study, the battery charge/discharge circuit is designed and simulated with the single phase bridgeless boost power factor correction circuit or boost DC-DC converter circuit with the photovoltaic panel. Firstly, a single-phase bridgeless power factor correction circuit was used to obtain the required DC and improve the power quality. The PQ control method is proposed for the single phase bridgeless power factor correction circuit. In the proposed control method, the active and reactive power is calculated from current and voltage measurements. The active power is passed from a high pass filter for obtain the DC component of the active power. Pdc is obtained from the DC bus voltage measurement. Finally, the reference current is calculated from the obtained power values and the PWM switching signal is generated. The obtained DC signal is applied to the bidirectional buck-boost DC-DC converter. The charge/discharge blocks and PI controls are used to this circuit for battery charge/discharge at constant current or constant voltage. Secondly, the boost DC-DC converter circuit with photovoltaic panel was controlled by using perturb&observe algorithm from maximum power point tracking (MPPT) methods. In the perturb & observe algorithm, power is calculated from current and voltage measurement in the output of the photovoltaic panel. The maximum power is obtained by derivative of power according to the voltage. The obtained DC signal is applied to the bidirectional buck-boost DC-DC converter. The charge/discharge blocks and PI controls are used to this circuit for battery charge/discharge at constant current or constant voltage. Simulation studies of battery charge/discharge circuits are implemented by using PSIM package program. Key Words: Single Phase Bridgeless Boost Power Factor Correction; Photovoltaic Panel; PQ Controller; MPPT Control; Battery Charge/Discharge