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Security-constrained unit commitment for simultaneous clearing of energy and ancillary services markets

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2 Author(s)
Zuyi Li ; Electr. & Comput. Eng. Dept., Illinois Inst. of Technol., Chicago, IL, USA ; Shahidehpour, M.

This paper introduces a security-constrained unit commitment (SCUC) model with emphases on the simultaneous optimization of energy and ancillary services markets. Benders decomposition is used to decouple the SCUC into a unit commitment (UC) master problem and hourly network security checking subproblems. Lagrangian relaxation is used to decouple the UC problem into individual single-unit commitment problems. Dynamic programming is used to find the optimal commitment decision. A simultaneous marginal curve algorithm is proposed to find the optimal values of energy and ancillary services. A six-bus system with three units and the IEEE 118-bus system with 54 units are analyzed to illustrate the proposed model.

Published in:

Power Systems, IEEE Transactions on  (Volume:20 ,  Issue: 2 )