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 of each unit group is provided to improve sunlight power generation efficiency by equivalently maintaining input voltage inputted to an inverter. CONSTITUTION: A plurality of string controllers(220) converts power generation voltage of a plurality of solar cell modules into output voltage which has an equal size by being respectively connected to each solar cell string. The string controllers control a maximum power point estimation process for each solar cell string for converting the power generation voltage. A detection part generates a detection value which includes output voltage, the power generation voltage, and environmental factors for varying a power generation amount of the solar cell module. A controller(210) generates a power estimation control signal for each string controller using the detection value. A converter(390) collects and converts the output voltage of the string controllers into AC power.