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电池储能单元群参与电力系统二次调频功率分配策略
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现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学)

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国家自然科学基金项目(面上项目,重点项目,重大项目),东北电力大学博士科研启动基金


Power Distribution Strategy for Battery Energy Storage Unit Group Participating in Secondary Frequency Modulation of Power System
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    摘要:

    大规模电池储能电站响应频繁的电力系统二次调频小额功率需求时,面临二次调频功率在电池储能单元群之间分配问题,分配不当会劣化储能电站运行效率。本文分析了电池储能单元充放电功率对其能量转换效率的影响,构建了电池储能单元效率-充放电功率模型,提出电池储能电站整体能量转换效率最大化的电池储能单元群功率分配策略。该策略可以提高电池储能电站运行效率、减小功率损失,同时在小额调频功率需求场景下可以减少电池储能单元响应数量,延长电池储能电站寿命。仿真分析验证了所提功率分配策略的有效性,与按比例功率分配策略和最大充放电功率分配策略对比结果表明,所提出的功率分配策略在提升电池储能系统运行效率以及减缓电池寿命衰减方面均具有优势。

    Abstract:

    The large-scale battery energy storage power station is faced with the problem of secondary frequency modulation power distribution among the battery energy storage unit group when it responds to the small power demand of frequent power system secondary frequency modulation, and improper distribution would degrade the operating efficiency of energy storage power stations. This paper analyzes the influence of charge and discharge power of battery energy storage unit on its energy conversion efficiency, constructs the efficiency-charge and discharge power model of battery energy storage unit, and proposes the power distribution strategy of battery energy storage unit group to maximize the overall energy conversion efficiency of energy storage station. This strategy can improve the operating efficiency of the battery energy storage system, reduce power loss, decrease the response quantity of the battery energy storage unit under the scenario of small frequency modulation power demand, and prolong the life of the energy storage station. Compared with the proportional power distribution strategy and the maximum charge/discharge power distribution strategy, the results show that the proposed power distribution strategy has advantages in improving the operating efficiency of battery energy storage system and slowing down the battery life decay.

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严干贵,刘莹,段双明,等.电池储能单元群参与电力系统二次调频功率分配策略[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20200116008.
YAN Gangui,LIU Ying,DUAN Shuangming,et al.Power Distribution Strategy for Battery Energy Storage Unit Group Participating in Secondary Frequency Modulation of Power System[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20200116008.

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  • 收稿日期:2020-01-16
  • 最后修改日期:2020-05-15
  • 录用日期:2020-04-20
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