Adaptive Power Allocation Control Strategy for Energy Storage Systems Considering SOC
熊昊 1唐灵修 1彭义淞 1韩松状 1曾雪洋2
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作者信息
1. 国网四川省电力公司成都供电公司,四川 成都 610041
2. 国网四川省电力公司电力科学研究院,四川 成都 610041
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摘要
为解决直流供电系统中储能单元之间功率分配不合理、荷电状态(state of charge,SOC)控制不均衡的问题,提出考虑SOC的储能系统自适应功率分配控制策略.首先,分析了储能单元采用下垂控制时的功率分配特性,在此基础上提出考虑SOC和充电/放电均衡因子的自适应下垂控制,并给出了参数设置依据.所提的自适应功率分配控制方法能够在放电时让初始SOC较高的储能单元承担更多的放电功率,充电时让初始SOC较低的储能单元承担更多的充电功率,并能根据SOC动态调整下垂系数和储能单元分配的充放电功率,实现储能单元功率合理分配和SOC的快速均衡控制.最后,在PSCAD/EMTDC中搭建仿真算例,验证了所提考虑SOC储能系统自适应功率分配控制方法的有效性.
Abstract
To solve the problems of unreasonable power allocation and unbalanced state of charge(SOC)control among energy storage units in DC power supply systems,an adaptive power allocation control strategy considering SOC is proposed for energy storage systems.Firstly,the power allocation characteristics of energy storage units adopting droop control are analyzed,and on this basis,an adaptive droop control considering SOC and charging/discharging balance factors is propose,and the basis for parameter setting is provided.The proposed adaptive power allocation control method can enable energy storage units with higher initial SOC to allocate more discharge power,and energy storage units with lower initial SOC to allocate more charging power.In addition,the proposed control method can dynamically adjust the droop coefficient and the charging or discharging power allocated by energy storage unit based on SOC,which can achieve reasonable power allocation of energy storage units and fast balancing control of SOC.Finally,a simulation example is built in PSCAD/EMTDC to verify the effectiveness of the proposed adaptive power allocation control method for energy storage systems considering SOC.
关键词
储能系统/下垂控制/SOC均衡/自适应控制/功率分配
Key words
energy storage system/droop control/SOC balancing/adaptive control/power allocation
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