Fuzzy security constraints for unit commitment with outages

Abstract

Transmission systems of power systems face risk of emergency transmission contingency and line outages. Proper optimisation tools are required to schedule generation during emergency conditions and to be able to study the effect of the transmission line outages. This study proposes a successive mixed integer linear programming (MILP) method with fuzzy security constraints for solving the AC Security Constrained Unit Commitment (AC-SCUC) challenge with transmission line outages. A linear formulation of AC-SCUC challenge is created resulting in an MILP model. This MILP model is transformed into a robust fuzzy MILP model that overcomes infeasibility arising from line outages. This fuzzy MILP model is set up and solved successively using MILP technique whereas updating both continuous and integer variables making the proposed algorithm efficient. The proposed method is tested on 6-bus, IEEE 57-bus, and IEEE 118-bus systems to demonstrate its capabilities and benefits.