摘要
针对现有的光伏电站储能装置类型过于单一且配置在光伏电站交流侧母线上、未能充分发挥交直流侧混合储能优势的问题,提出了一种大型光伏电站交直流侧混合储能联合设计方法,在光伏电站交流侧配置功率密度大、循环寿命长的储能电池,主要用于一次调频等功能,能有效减少直流侧储能装置充放电次数,提高直流侧储能电池的寿命;在直流侧配置能量密度高的储能电池,能有效提高光伏电站容配比,减少光伏电站超配所造成的电能损失,提升光伏电站的发电效益。此外,直流侧储能装置与光伏组串共用集中逆变升压一体机,能提高光伏电站交流设备及电缆的利用率,节约光伏项目储能配置投资成本。
Existing photovoltaic power plant energy storage equipment has many shortcomings,such as a single type and configured on the PV power plant AC side bus,failing to fully exploit the benefits of hybrid AC and DC energy storage.To address this issue,we propose a joint design method for hybrid energy storage integrating both AC and DC sides in large-scale photovoltaic(PV)power stations.On the AC side,an energy storage battery for primary frequency regulation is configured.The battery has high power density and long cycle lifetime,which can effectively reduce the number of times of charging and discharging and improve the lifetime of the DC side energy storage battery.On the DC side,energy storage batteries with high energy density are configured to effectively improve the capacity ratio,reduce the power loss caused by over-allocation,and enhance the power generation efficiency of the PV power plant.In addition,our approach enables the shared utilization of a centralized inverter-booster machine with PV strings on the DC side,which can improve the utilization of AC equipment and cables in PV power plants and save the investment cost of energy storage configuration in PV projects.
作者
李胜
周蓉
LI Sheng;ZHOU Rong(Changjiang Institute of Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430014,China;Hubei Electric Power Survey and Design Institute Co.,Ltd.,Wuhan 430040,China)
出处
《长江技术经济》
2024年第3期110-117,共8页
Technology and Economy of Changjiang
关键词
光伏发电
混合储能
设计方法
一次调频
photovoltaic power generation
hybrid energy storage
designing method
primary frequency modulation
