Variable Feedback Gain DC-DC Converer Tracing Output Voltage Fluctuation for Renewable Energy System

摘要

The renewable energy source is attracted attention as a clean energy source because an amount of fossil fuel is limited. It can contribute reduction of CO2 emission too. When the renewable energy system is installed, the energy management is needed due to not only balance of supply and demand but also uncertainty of power generation. The digital control switching power supply can be an essential of power supply system in such a situation. The aim of this paper is to propose a new feedback gain changing method for the switching power supply. The proposed method varies a feedback gain in accordance with a fluctuation of output voltage to adapt to a variety pattern of fluctuation. The validity of proposed method is confirmed by simulation.