Voltage Control of a Standalone PV Power System

A PWM based fuzzy logic controller (FLC) control approach is implemented with the intention to control the voltage magnitude of DC load bus in an isolated photovoltaic and battery-based dc network. Double loop regulation strategy is adopted to control the voltage of load bus. The inner loop regulates the inductor current while the outer loop regulates the voltage of load bus. The two fuzzy logic controllers are used to control the process. The implementation of the control strategy is being explained in detail. The optimum power is derived from the photovoltaic panel during varying insolation condition by incremental conductance MPPT and is stepped up by the boost converter. The recommended scheme is simulated in the MATLAB/Simulink under varying irradiance conditions.