PHOTOVOLTAIC POWER GENERATION SYSTEM PERFORM THE MAXIMUM POWER POINT TRACKING ABOUT THE UNIT GROUP

摘要

PURPOSE: A sunlight power generation system which estimates a maximum power point for each group is provided to increase power generation efficiency by easily estimating a power point by applying environmental factors to a simple control method. CONSTITUTION: A plurality of solar cell strings is comprised of a plurality of solar cell modules. An inverter(300) converts output voltage of a string optimizer into AC voltage and supplies the AC voltage to a power system. A string optimizer(200) comprises a string control device, a sensor, and a controller. The string control device(220) converts power generation voltage into output voltage and controls a maximum power point estimation process. The sensor creates a sensing value which includes the output voltage, the power generation voltage, and environmental factors for varying a power generation amount of the solar cell module. The controller creates a power estimation control signal with respect to each string control device using the sensing value.