MODELING OF PHOTOVOLTAIC MODULE USING BUCK-BOOST CONVERTER WITH PWM CONTROLLING

Our aim is to increase the efficiency and get the maximum power from the pv system. It is also required that constant voltage be supplied to the load irrespective of the variation in solar irradiance and temperature. To achieve stabilization from above two variation. We have designed a buck boost circuit such that it delivers constant dc voltage to the load. The photovoltaic module is analyzed using MATLAB SIMULINK software. Then we coupled the PV array with the buck boost converter..Now there are cases when isolation level is high and low that it may cause dangerously high power across the load. Under such conditions this DC-DC buck boost converter will automatically start working in buck/boost mode. Now every time when the power crosses its upper limit the DC-DC converter will switch to buck/ mode and when safe power is reached. The output voltage is adjustable based on the duty cycle of the switching transistor. which will control the pwm controller and maintain constant load voltage.