Research on Multi-Source Fusion Energy Harvesting Method Based on Solar-Thermal-Wind-Vibration Complementary Matching

The smart grid uses energy harvesting devices to ensure continuous and reliable operation of transmission line monitoring systems, ensuring power system safety. To address the issues of single-source energy harvesting and large fluctuations, this study proposes multi-source fusion energy harvesting method based on solar-thermal-wind-vibration complementary matching. By coupling thermo-photovoltaic (PV-T) and electrostaticpiezoelectric energy harvesting (E-PEH), various energies are harvested, and an energy management circuit integrates the power supply. The optimized PV-T structure achieves a maximum output power of 2.09 W, with thermoelectric power accounting for $9.01 \%$. The E-PEH, combining non-uniform cross-section beams and electret component, reaches a maximum power of 6.74 mW. The management circuit, based on lithium battery and super-capacitor hybrid energy storage mechanism, improves system dynamic response and stability. Experimental results show that the proposed method meets the high power, stable supply, and fast response requirements of monitoring devices.