Development and Evaluation of Optimizer for Solar Modules Based on Step-down Converter

Step-down converter 기반 태양광 모듈용 Optimizer 개발 및 평가

This study addresses the significant power loss in solar power systems caused by shading on solar modules connected in series. To mitigate this issue, a power optimizer using a step-down DC/DC converter was developed and evaluated. The study introduces an indoor performance evaluation methodology for the optimizer, which is novel compared to existing approaches that primarily rely on outdoor shading conditions. The optimizer was designed to maintain current consistency across series-connected solar modules by dynamically adjusting voltage and current. Prototype testing was conducted under indoor conditions with a simulated power supply and batteries to validate its operational characteristics. Subsequently, outdoor testing was performed on a 3 kW solar power plant with controlled shading scenarios. The results demonstrated an increase in power output by approximately 15.5% when the optimizer was operational, compared to non-optimized conditions. This confirms the effectiveness of the optimizer in improving energy yield under partial shading. The study concludes with recommendations for the standardization of indoor testing methodologies and further exploration of optimizers under diverse shading and connection scenarios.