北京交通大学电气工程学院, 北京市 100044
School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Large-scale cascading accidents can be caused by the overload of transmission sections. The occurrence of malignant accidents can be avoided by using reasonable and effective protection and control measures to reduce the power pressure of transmission section, which is important to the safe operation of power system. Aiming at the overload of transmission section, a bi-objective progressive protection and control optimization model and the corresponding coordination strategy are proposed. The overload protection can be used as a control method to change the network structure. It is cooperated with the emergency control resources to obtain a better adjustment effect for the transmission section overload. Firstly, based on the power flow tracking method, the source-load transmission paths in power system are found. By taking source-load paths as the basic adjustment units, the operation conditions of overload protection are introduced as parameters to be optimized. Two-layer optimization objectives are constructed, i. e. reducing the load shedding amount is the objective on the first layer, and improving the security of the system is the objective on the second layer. The nested optimization algorithm is used to solve the problem layer by layer. On the premise of power within safety constraints, the proposed strategy can optimize the adjustment of generators and loads, and the operation conditions of overload protection. Effectiveness of the proposed method is verified by the simulation results.
WANG Ziqi, HE Jinghan,ZHANG Dahai.Bi-objective Progressive Coordinated Optimization Strategy for Protection and Control of Transmission Section Overload[J].Automation of Electric Power Systems,2019,43(19):140-148. DOI:10.7500/AEPS20180813004.