基于新型混合储能结构的独立光伏发电系统

STAND-ALONE PV SYSTEM BASED ON NEW STRUCTURE OF HYBRID ENERGY STORAGE

针对独立光伏发电系统特殊的工作情况,提出一种基于新型双向Buck变换器的有源式混合储能方案。建立系统模型,给出系统能量管理和控制策略。仿真和实验结果表明:所提出的混合储能方案能充分发挥超级电容器的优势,有效改善蓄电池的工作状态,延长其使用寿命,特别适合于负载功率脉动频繁的独立光伏发电系统。

Because the complementary cnaracteristics of ultracapacitor and battery, the hybrid energy storage system with these two components will possess better performances, not only power density but also energy density will be upgraded, life time of the system will be prolonged. Aiming at special operation process of stand-alone PV system, a new active hybrid energy storage scheme was proposed based on bidirectional buck converter. Mathematical model was established, and the strategy for energy management and system control were presented. The simulation and experimental results show that the proposed scheme can make most of the advantages of ultracapacitor, optimize the operation process and prolong the lifetime of battery.