基于安全限定义的新能源电力系统区间经济调度模型及算法  

Model and Algorithm of Interval Economic Dispatch of Power Systems Incorporating Renewable Energy Based on Security Limits Method

作　　者：贾婉清 张聪 刘乾 王大鹏 杨怀智 李佳勇 JIA Wanqing;ZHANG Cong;LIU Qian;WANG Dapeng;YANG Huaizhi;LI Jiayong(College of Electrical and Information Engineering,Hunan University,Changsha 410082,Hunan Province,China)

机构地区：[1]湖南大学电气与信息工程学院,湖南省长沙市410082

出　　处：《电网技术》2024年第2期509-516,共8页Power System Technology

基　　金：国家自然科学基金青年科学基金项目(52007056);国家自然科学基金项目(52125705);湖南省重点研发计划项目(2021SK2051)。

摘　　要：大规模风电等新能源机组接入电网,其不确定性和波动性对电网的安全运行造成冲击。目前采用的鲁棒调度和区间调度无法同时考虑不确定性条件下系统功率平衡和全场景下线路潮流安全双重约束。为此,将风电出力视为区间数,考虑极端场景下的功率平衡约束和可转移、可削减柔性负荷的参与建立了计及风电不确定性和电力平衡的区间经济调度模型。为求解该模型,提出了基于安全限定义的区间经济调度算法,该算法采用优化场景法求解区间直流潮流得到安全限,进而通过安全限定义法将区间优化模型转化为确定性的二次规划模型求解。采用IEEE 118节点系统测试,结果表明了所提区间经济调度算法既能满足极端场景下的电力平衡需求,又能保证所有场景下线路传输功率的安全性,同时降低了调度成本,发挥了柔性负荷削峰填谷的作用,且风电出力较小或较大时通过削减负荷或弃风实现经济性,为新能源电力系统安全、经济运行提供技术支撑。With the large-scale wind power and other renewable energy are integrated into the power grid,their uncertainty and volatility have threatened the operational security of the power grids.In view of this problem,the robust dispatch and the interval dispatch methods conventionally adopted cannot consider the constraints of the system power balance and the line power flow safety simultaneously under the uncertainty.Thereby,in this paper,regarding the wind power output as an interval number,the interval economic dispatch model considering the shiftable and reducible flexible loads is established,where the constraints of power balance under the wind power limitation scenarios,the constraints of system power balance under the uncertainty,and the line power flow safety constraints under the uncertainty are taken into account.In order to solve the model,an interval economic dispatch approach based on the security limit method(SLM)is proposed,in which the optimizing-scenarios method(OSM)is used to solve the interval DC power flow,obtaining the safety limit.Then,the interval optimization model is transformed to a deterministic quadratic programming model through the SLM.Adopting the IEEE 118-bus system for testing,the results show that the dispatch strategy obtained by the proposed method is able to satisfy the power balance constraints in the extreme scenarios and ensure the safety of the line transmission power for all the uncertain scenarios,while reducing the dispatching cost.In addition,the operating cost can be saved by reducing the load or curtailing the wind when the wind power output is small or large,and the flexible loads here play a role of peak cutting and valley filling,which provides a technical support for the safe and economic operation of the power systems incorporating renewable energy.

关 键 词：风力发电 柔性负荷 区间经济调度 安全限定义法 新能源电力系统 

分 类 号：TM721[电气工程—电力系统及自动化]