摘要
由于分布式固体电储热(distributed solid electric thermal storage,DSETS)面临多种环境气温因素影响,对其实施能量平移调度时可能出现不受控情况,从而导致含DSETS的多能源系统运行面临安全风险。为解决该问题,提出一种含DSETS的电热联合系统安全评估及预防控制方法。首先,建立一个两阶段优化模型:第一阶段以系统运行成本最小为目标,针对含DSETS的电热联合系统建立预想事故集,模拟DSETS能量转移过程中负荷需求突然增加和支路N-1预想事故扰动,并利用所提的支路重载评估指标,评价故障后系统的安全性;当第一阶段优化结果出现支路重载情况时,进入第二阶段采取预防控制,本阶段以系统各单元有功调节量最小为目标,对重载支路进行校正,通过调节系统各机组出力,使支路有功潮流降低至安全裕度之下。最后,通过对比预防控制前、后系统的安全性,验证预防控制模型及评估指标的有效性。上述2种预想事故导致支路重载指标分别为2.82%和6.96%,采取预防控制后,支路无重载。
Since the distributed solid electric thermal storage(DSETS)is affected by various environmental temperature factors,the schedule of energy transfer may be uncontrolled,which causes the security risks in the operation of multi-energy systems with DSETS.Thus,to tackle this problem,a security assessment and preventive control method of combined electricity and heat systems with DSETS is proposed.Firstly,a two-stage optimization model is established.The objective of the first stage is to minimize the system operation cost.A contingency set is established for the combined electricity and heat systems with DSETS.The contingency set is used to simulate the disturbance of the DSETS’load increase and the branch N-1,and the proposed evaluation index of branch overload is applied to evaluate the security of the system after a contingency.The preventive control is adopted in the second stage when the branch is overloaded in the first stage of optimization.The objective of the second stage is to minimize the active power adjustment of each unit of the system,and the overload branch is corrected.The active power flow of the branch is reduced below the safety margin by regulating the output of each unit of the system.Finally,by comparing the safety of systems with or without the preventive control,the validity of the preventive control model and evaluation index is verified.The overload indices of the above two contingencies are 2.82%and 6.96%,respectively,and the overload of a branch is corrected by adopting the preventive control.
作者
纪慧超
王海鑫
杨俊友
刘沐易
张世宇
JI Huichao;WANG Haixin;YANG Junyou;LIU Muyi;ZHANG Shiyu(School of Electrical Engineering,Shenyang University of Technology,Shenyang 110870,China;School of Automation Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China)
出处
《电力建设》
CSCD
北大核心
2022年第3期100-111,共12页
Electric Power Construction
基金
辽宁省科协科技创新智库项目(LNKX2020ZD03)
辽宁省教育厅科学研究经费项目(LQGD2019005)
辽宁省博士科研启动基金(2020-BS-141)。
