摘要
针对配电系统遭受故障后产生失负荷现象并难以恢复的问题,提出了计及电-气-热多能耦合的有源配电网故障恢复方法。首先,剖析电-气-热综合能源系统(integrated energy system,IES)中燃气轮机和热电联产耦合设备异质能流的转化特性,深度挖掘电力网-天然气网-热网多能流在能源转化过程中通过“以气转电”和“以热替电”降低失负荷风险。其次,以失负荷量最小和开关动作次数最少为目标函数,基于Distflow潮流方程构建计及IES的有源配电网故障恢复模型,通过调整网络拓扑结构和运行状态决策出最优故障恢复策略。然后,针对模型非凸非线性特点,采用二阶锥松弛法和Big-M法将其转化为混合整数二阶锥规划模型以便于求解。最后,以IEEE 33节点配电网、20节点天然气网和16节点热网(E33-G20-H16)组成的IES为例,验证了利用电-气-热多能耦合IES对配电网进行故障恢复可有效减少开关动作次数并改善失负荷现象。
Aiming at the difficulty of restoring from the loss of load in distribution systems after experiencing faults,this paper proposes an active distribution network service restoration method that takes into account the multi-energy coupling of electricity-gas-heat.Firstly,this paper undertakes an analysis of the transformation characteristics of heterogeneous energy flows in the Integrated Energy System(IES),focusing on the coupling equipment of gas turbines(GT)and combined heat and power(CHP)devices.The study delves deeply into the mechanisms of electricity grid-natural gas network-heat network multi-energy flows during the energy conversion process,emphasizing the reduction of the risk of load shedding through the strategies of substituting gas for electricity and substituting heat for electricity.Subsequently,with the minimization of lost load and the reduction of switch operations as the objective functions,this paper constructs an active distribution network service restoration model for the IES based on the Distflow model.This model takes into account the coupling of electric,gas,and heat elements.By adjusting the network’s topological structure and operational decisions,the optimal service restoration strategy is determined.Furthermore,addressing the non-convex and non-linear characteristics of the model,this paper employs second-order cone relaxation and the Big-M method to transform it into a mixed-integer second-order cone programming model for ease of solution.Lastly,using an IES comprised of an IEEE 33-node distribution network,a 20-node natural gas network,and a 16-node heat network(E33-G20-H16)as an example,this paper validates that employing a integrated energy recovery distribution network with electric-gas-heat multi-energy coupling can effectively reduce the number of switch operations and improve the phenomenon of lost load in the event of faults.
作者
李尚宇
秦昱
田巍巍
周荣乐
臧祥宇
LI Shangyu;QIN Yu;TIAN Weiwei;ZHOU Rongle;ZANG Xiangyu(State Grid International Development Co.,Ltd.,Beijing 100010,China;Zhuhai XJ Electric Co.,Ltd.,Zhuhai 519060,China;College of Electrical Engineering and Automation,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《供用电》
北大核心
2024年第3期51-60,共10页
Distribution & Utilization
基金
中国博士后面上资助项目(2023M734092)。
关键词
综合能源系统
故障恢复
异质能流
网络重构
有源配电网
integrated energy system
service restoration
heterogeneous energy flows
network reconfiguration
active distribution network
