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

TL;DR

This paper proposes a security-constrained unit commitment model that incorporates corrective demand response to improve system reliability and reduce costs during post-contingency emergencies.

Contribution

It introduces a novel SCUC model that explicitly considers the benefits of corrective demand response for enhancing system flexibility and reliability after outages.

Findings

Significant cost savings in daily operations.

Improved long-term generator reliability.

Enhanced ability to meet critical demands.

Abstract

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