Abstract
Under the social situation of carbon emission reduction, various new photovoltaic energy storage devices spew out. However, at present, there are many researches on the algorithm of photovoltaic energy storage devices in the market, and less research on the test platform. Therefore, a Photovoltaic energy storage system test platform based on STM32 is designed, the purpose is to provide an open test platform for the Photovoltaic energy storage system algorithm. The system takes STM32F407VGT6 as the main controller, and the hardware of the system is consisted of bidirectional DC-DC, auxiliary electrical power source, battery pack, drive circuit and sampling circuit. In addition, the software takes P&O method (Perturbation and Observation Method) and PID (Proportion Integral Differential) control algorithm to achieve the system's maximum power point tracking and voltage stable output, which can realize the comprehensive utilization of the UPS battery. The experiment results show that the effect of the maximum power tracking is great, the value of the output voltage is stable, and the efficiency of the UPS system can reach 98.1%.
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