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Enhancing System Flexibility through Corrective Demand Response in Security-Constrained Unit Commitment

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Document pages: 6 pages

Abstract: Currently, system operators implement demand response by dispatchingcontrollable loads for economic reasons in day-ahead scheduling. Particularly,demand shifting from peak hours when the cost of electricity is higher tonon-peak hours to maintain system reliability by flattening the load profile.However, the system flexibility and economic benefits of such action inpost-contingency scenarios are not explicitly considered in short-termoperations. Hence, this paper highlights the benefits of demand response as acorrective action for potential post-contingency emergencies in day-aheadscheduling. A security-constrained unit commitment (SCUC) model which considersthe flexibility offered through corrective demand response (CDR) to maintainsystem reliability when a line or generator outage occurs is proposed. Theproposed model was tested on IEEE 24-bus system where simulation results pointto significant total cost savings in daily operations. Moreover, the resultspoint to better long-term reliability of generators along with the ability touse existing system flexibility and serve higher critical demands in base-casewhen CDR is implemented.

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