考虑水电库容弹性的电力系统经济调度  

Economic Dispatch of Power System Considering Capacity Flexibility of Hydropower Reservoir

作　　者：温世杨 余娟[1] 代伟 杨知方 杨高峰 杨茂查 WEN Shiyang;YU Juan;DAI Wei;YANG Zhifang;YANG Gaofeng;YANG Maocha(State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University),Chongqing 400044,China;School of Electrical Engineering,Guangxi University,Nanning 530004,China;State Grid Chongqing Electric Power Company,Chongqing 400015,China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市400044 [2]广西大学电气工程学院,广西壮族自治区南宁市530004 [3]国网重庆市电力公司,重庆市400015

出　　处：《电力系统自动化》2020年第19期73-82,共10页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51807014);重庆市自然科学基金博士后科学基金资助项目(cstc2019jcyj-bshX0081)。

摘　　要：随着负荷的增长与新能源的接入,电网运行的安全域不断减小。为此可充分挖掘电网的运行弹性空间,扩大电网运行安全域,实现资源的优化配置。文中提出水电库容弹性空间概念,并建立了考虑来水不确定性和风险成本的库容运行弹性模型;基于此提出了考虑库容弹性空间的经济调度模型,以用于评估考虑库容弹性后的电网运行效益。此外,基于KKT(Karush-Kuhn-Tucker)条件,推导了库容弹性与电网运行状态量之间的灵敏度关系,并提出了关键库容弹性的灵敏度辨识方法,进而在电力系统运行时优先利用关键库容弹性。最后,通过IEEE 30节点系统和某地区的实际电网验证了所提方法的有效性。仿真结果表明,所提方法能够在考虑水库防洪风险控制需求的基础上,有效利用水电库容弹性空间来灵活地调整库存水量,促进水电、风电消纳,降低电网运行成本。With the increase of load and the integration of renewable energy,the operation security region of power grid is decreasing.Therefore,the operation flexibility space of power grid should be fully exploited to expand the operation security region of power grid,so as to achieve the optimal allocation of resources.In this paper,a concept of capacity flexibility space of hydropower reservoir is proposed,and the operation flexibility model for capacity of reservoir considering the uncertainty of water inflow and risk cost is established.On this basis,an economic dispatch model is proposed to evaluate the operation benefit of power grid considering the capacity flexibility of reservoir.In addition,based on Karush-Kuhn-Tucker(KKT)conditions,the sensitivity relationship between capacity flexibility of reservoir and operation state variables of power grid is deduced,and a sensitivity identification method for critical capacity flexibility space of reservoir is proposed to utilize the critical capacity flexibility space of reservoir preferentially in power grid operation.Finally,the effectiveness of the proposed method is verified on IEEE 30-bus system and an actual regional power grid.The simulation results dedicate that,on the basis of considering the demand of flood risk control of a reservoir,the proposed method can effectively utilize the capacity flexibility space of reservoir to adjust the reservoir water storage flexibly,promote the hydropower and wind power consumption,as well as reduce the operation cost of power grid.

关 键 词：运行弹性空间 水电库容 经济调度 灵敏度 

分 类 号：TM73[电气工程—电力系统及自动化]