摘要
针对光伏电池输出间歇、波动的问题,设计了以四开关BUCK-BOOST电路为核心的高效三端口DC-DC变换器。该系统采用数字电源方案,变换器的3个端口分别连接模拟光伏输入、蓄电池和负载。系统由半桥驱动电路、升降压BUCK-BOOST电路、输出BOOST电路、电压与电流采样电路等构成;采用具有高分辨率定时器的高性能STM32G474RET6控制器,设计了BUCK-BOOST、BOOST、MPPT等算法,通过对电路高效控制,实现了完全数字化的高精度电压调整率、负载调整率、过流保护以及光伏电池的最大功率点跟踪。经测试,该三端口稳压变换器输出稳定,总体效率超过95%,供电模式无缝切换,最大功率点追踪稳定。
Aiming at the intermittent and fluctuating output of photovoltaic cells,this work uses digital control technology to design a high-efficiency three port DC-DC converter with four switch buck-boost circuit as the core.The three ports are respectively connected with analog photovoltaic input,battery and load.The system is composed of half bridge drive circuit,buck-boost circuit,output boost circuit,voltage and current sampling circuit,etc.A high-performance STM32G474RET6 controller with high-resolution timer is used to design the algorithms of BUCK-BOOST,BOOST,and MPPT to achieve fully digitalized,high-precision voltage regulation rate,load regulation rate,over-current protection,and maximum power point tracking of photovoltaic cells through efficient control of the circuit.After verification,the output of the three port stabilized voltage converter is stable,the overall efficiency is more than 95%,the power supply mode is seamlessly switched,and the maximum power point tracking is stable.
作者
李胜铭
郝智贤
吴振宇
LI Shengming;HAO Zhixian;WU Zhenyu(School of Innovation and Entrepreneurship,Dalian University of Technology,Dalian 116024,Liaoning,China)
出处
《实验室研究与探索》
CAS
北大核心
2023年第5期62-67,共6页
Research and Exploration In Laboratory
基金
国家自然科学基金项目(62206040)。
