Design of Adaptive PD Controller in Digital Solar Cell Buck Converter

This paper proposes adaptive PD controller in digital solar cell buck converter. The solar cells and other alternative energy sources has increased, so it is necessary to seek energy conversion optimization of energy sources. There are several research topic of DC-to-DC converter circuits for battery charging have been utilized with buck converter. In the solar buck converter, the problems of illumination change, solar panel dust, and aging circuit are a nonlinear problem, so a digital controller needs to be designed to solve. The determination of the PD controller constants depends on the system characteristics. This paper proposes adaptive PD controller that adjusts the control value according to the output target real time, so that the system can be optimized to overcome nonlinear problems such as various illumination changes, solar panel dust, and aging buck circuit. In the experimental results, the input voltage and the load change for target output voltage which adaptive control laws can be adjusted real time to achieve the robustness of the system.