University of Tabriz Tabriz Journal of Electrical Engineering 2008-7799 48 1 2018 05 22 Coordinated Generation and Transmission Expansion Planning with Short Circuit Level Constraint and Multi-Level Loads Coordinated Generation and Transmission Expansion Planning with Short Circuit Level Constraint and Multi-Level Loads 357 367 7440 FA M. Najjar Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran H. Falaghi Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran S. H. Hosseini Faculty of Electrical Engineering, University of Zanjan, Zanjan, Iran Journal Article 2017 01 23 This paper proposes a novel approach for coordinated generation, transmission expansion planning with MILP formulation considering security analysis and the cost of generation of the power plants and the investment cost of substations are reduced. Optimal power flow is considered for different load levels and the transmission lines do not limit the optimal power flow. Therefore, the cost of generations will be decreased. Accordingly, short circuit level constraint is considered by a hierarchical approach. Thus, the investment cost of substations is decreased. In addition, N-1 security is taken into account in the main problem with MILP formulation. The proposed approach is applied to Garver 6-bus and IEEE 24-bus test systems in MATLAB and the results are compared with the other papers and show good performance of the proposed approach. This paper proposes a novel approach for coordinated generation, transmission expansion planning with MILP formulation considering security analysis and the cost of generation of the power plants and the investment cost of substations are reduced. Optimal power flow is considered for different load levels and the transmission lines do not limit the optimal power flow. Therefore, the cost of generations will be decreased. Accordingly, short circuit level constraint is considered by a hierarchical approach. Thus, the investment cost of substations is decreased. In addition, N-1 security is taken into account in the main problem with MILP formulation. The proposed approach is applied to Garver 6-bus and IEEE 24-bus test systems in MATLAB and the results are compared with the other papers and show good performance of the proposed approach. https://tjee.tabrizu.ac.ir/article_7440_aed1c00cc6d259762dfb0e77460029fe.pdf