Security-constrained Unit Commitment Considering Hydro Units and AC Network Modeling by a New Hybrid Solution Method Composed of Benders Decomposition and Outer Approximation Nima Amjady & Mohammad Reza Ansari Abstract This article presents a new hybrid solution approach based on Benders decomposition and outer approximation to solve the security-constrained unit commitment problem. The security-constrained unit commitment model includes both thermal and hydro unit commitment as well as AC network modeling. The proposed solution method decomposes the security-constrained unit commitment formulation into a master problem and sub-problem. The master problem includes a mixed-integer linear model of unit commitment, while the sub-problem contains a non-linear formulation for security-constrained economic dispatch of each time interval. The master problem accumulates linearizations (outer approximations) and Benders cuts obtained from the solution of the sub-problem. The proposed method can efficiently solve the security-constrained unit commitment problem with a low computation burden, completely satisfying diverse constraints of the problem with zero penalty terms.

The proposed hybrid solution approach is tested on the well-known 9-bus and IEEE 118-bus test systems and compared with some other recently published solution methods. These comparisons confirm the validity of the developed approach. Keywords: security-constrained unit commitmentBenders decompositionouter approximationhybrid solution approach MSc Cyber Security & Human Factors Job Retention Through Education The multimillion pound Bournemouth University Cyber Security Unit (BUCSU), located within the Faculty of Science & Technology and part funded from the Higher Education Innovation Fund (HEIF), puts Bournemouth at the forefront of cyber security through the fusion of enterprise engagement, research and education. Cyber crime is a growing problem for organisations worldwide. All businesses face serious threats from hackers, data protection breaches and compliance issues. Without comprehensive security, these can cost your business significant amounts of money. The research carried out by the members of BUCSU is a vital component for underpinning high-quality educational curricula, collaborative partnerships and maximising the University's contribution to regional, national and global economies.

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