OICC Press Majlesi Journal of Electrical Engineering 2345-3796 9 1 2024 02 20 Reliability and Security Constrained Unit Commitment With Hybrid Optimization Method EN Ahmad Heidari Department of Electrical Engineering, Malek-Ashtar University of Technology (MUT), Tehran, Iran. Mohammad Reza Alizadeh Pahlavani Department of Electrical Engineering, Malek-Ashtar University of Technology (MUT), Tehran, Iran. Hamid Dehghani Department of Electrical Engineering, Malek-Ashtar University of Technology (MUT), Tehran, Iran. Journal Article 2024 02 20 This paper presents an advanced optimization technique to solve unit commitment problems and reliability issues simultaneously for thermal generating units. To solve unit commitment, generalized benders decomposition along with genetic algorithm to include minimum up/down time constraints are proposed, and for reliability issues consideration, a fuzzy stochastic-based technique is presented. To implement the problem into an optimization program, the MATLAB software, and CPLEX and KNITRO solvers are used. To verify the proposed technique and algorithm, two case studies that are IEEE 14 and 118 bus systems are implemented for optimal generation scheduling, and reliability issues. Finally, a comparison with other solution techniques has been given.