PV-Battery Integrated Dual-CLLLC Converter System for Critical Load Applications with Mode-Adaptive Power Control

The increasing demand for reliable renewable energy solutions necessitates an effective power management, especially for critical load applications. This paper presents a PV-Battery Integrated Dual-CLLLC Converter System with an adaptive mode power control strategy to enhance energy efficiency and stability. The proposed dual-CLLLC resonant converter utilizes soft-switching to reduce losses, and improve performance of the system. A pulse frequency modulation (PFM)-based Maximum Power Point Tracking (MPPT) algorithm dynamically adjusts the switching frequency for fast and accurate MPP tracking under varying solar conditions. To ensure uninterrupted operation, a battery energy storage system (BESS) and an adaptive mode-selection algorithm enables smooth transitions between different power modes. Furthermore, the system’s bidirectional power flow capability enhances energy exchange between the PV system, battery, and DC microgrid. The systems high efficiency, fast dynamic response, and improved reliability compared to conventional MPPT techniques are validated in the MATLAB Simulink software. This scalable and robust technique optimizes PV utilization, ensuring stable and uninterrupted power delivery for critical load applications.