独立光伏系统中超级电容器蓄电池有源混合储能方案的研究

超级电容器与蓄电池混合使用,可以充分发挥蓄电池能量密度大和超级电容器功率密度大、循环寿命长的优点,大大提升储能系统的性能.针对独立光伏系统的特点,设计了一种有源式混合储能方案,建立了系统的模型和控制环节.实验结果表明,在光伏发电功率和负载功率脉动时,蓄电池能够工作在优化的充放电状态,并能够有效地减少充放电小循环次数.对解决光伏等可再生能源系统中的储能问题,具有现实可行性.

Study on an actively controlled battery/ultracapacitor hybrid in stand-alone PV system

Sound performance can be attained through battery/uhracapacitor hybrid, which makes the best of the characteristics of high energy density of battery and high power density and long circle life of ultracapacitor. An actively controlled hybrid structure was put forward and utilized in a stand-alone PV system. The model and control loop of the system were set up. Experiment results exhibited that the current of the battery is quite smooth when PV power and load power varied quickly. The small charge and recharge cycles due to irradiation variation can be reduced effectively through proper ultracapacitor bank configuration. The hybrid energy storage in PV system can become economical for the reasons that the battery capacity can be reduced for the purpose of high power requirement and that the life of the battery can be lengthened due to reduced small charging and recharging cycles. Something valuable and practical can be attained from this paper to solve the energy storage problem in stand-alone PV system and other regeneration energy systems.