基于智慧蓄电池的光伏储能系统及其控制策略

Photovoltaic energy storage system based on smart battery and its control strategy

由于蓄电池的不一致性,导致光伏储能系统容量和寿命都显著下降,影响光伏系统安全。文章将分布式模块化变流器技术、物联网技术、智能控制技术和蓄电池相结合,设计了一种新型智慧蓄电池的结构,提出基于智慧蓄电池的光伏储能系统构建方法,并分析了其总体控制策略和蓄电池SOC(State of Charge)均衡控制策略,进行了蓄电池SOC均衡控制实验和光伏储能系统能量消纳能力对比实验。实验结果表明,基于智慧蓄电池的光伏储能系统能够稳定运行,其中分布式模块化变流器既可以作为储能变流器,同时还能灵活有效地对蓄电池SOC进行均衡,提高了光伏储能系统的能量消纳能力。

The inconsistency of batteries leads to a significant decrease in the capacity and lifetime of the PV(photovoltaic)energy storage system,which affects the safety of the PV system.Combining distributed modular converter,Internet of Things,Intelligent control and batteries,a new structure of the smart battery is proposed.Based on the smart battery,a construction method of PV energy storage system is proposed.The overall control strategy and the battery SOC(State of Charge)equalization control strategy are analyzed.The experiment on the SOC equalization control of batteries and the comparative experiment on the energy absorption capacity of PV energy storage systems were conducted.The experimental results show that the PV energy storage system based on the smart battery can operate stably,and the distributed modular converter can be used as an energy storage converter,and at the same time,it can equalize the battery SOC flexibly and effectively,which improves the energy absorption capacity of the PV energy stor-age system.