独立光伏电站蓄电池优化管理研究

Optimal battery management of stand-alone PV power station

为了实现独立光伏电站系统中蓄电池的优化管理,有效地延长其工作寿命,提出了基于混合型模糊PID控制算法的分段式蓄电池充电策略。该策略将蓄电池的充电分为恒流充电、恒压均充和恒压浮充3个阶段,浮充电压可根据电池温度进行实时补偿。将定时功能与电流判据相结合,控制均、浮充的转换,可避免蓄电池的过充或欠充。介绍了基于该策略的控制器的硬件组成以及软件实现。试验结果和实际运行表明,该系统具有高效、稳定、自动化程度高的特点。

In order to realize the optimal management of storage battery for the stand-alone PV power station system to prolong its working life, a multi-step charge strategy based on fuzzy-PID control arithmetic is presented, which has three steps： constant current charge, constant voltage equalizing charge and constant voltage floating charge. The floating charge voltage is compensated in real time according to battery temperature. The time criterion is combined with the current criterion to control the transition between the equalizing charge and the floating charge, avoiding the overcharge and insufficient charge. The hardware and software implementation of the controller based on proposed strategy are introduced. Experiments and site operations show that the system has high efficiency, high stability and high automation.