Enhanced Energy Management System with Corrective Transmission Switching Strategy. Part I: Methodology

TL;DR

This paper introduces a methodology for integrating corrective transmission switching into energy management systems, enhancing system flexibility, reducing congestion costs, and improving social welfare in real-time electricity dispatch.

Contribution

It proposes two EMS procedures incorporating CTS, with the enhanced Procedure-B featuring a branch pseudo limit, advancing practical application of transmission flexibility.

Findings

Procedure-A effectively eliminates post-contingency overloads.

Procedure-B significantly reduces congestion costs.

Integrating CTS improves social welfare.

Abstract

The flexibility in transmission networks is not fully utilized and reflected in existing energy management systems (EMSs). Corrective transmission switching (CTS) is proposed in this two-part paper to enable EMS to take advantage of the flexibility in transmission systems in a practical way. This paper proposes two EMS procedures: 1) Procedure-A connects real-time security-constrained economic dispatch (RT SCED) with real-time contingency analysis (RTCA), which is consistent with industrial practice; 2) Procedure-B, an enhanced version of Procedure-A, includes CTS in EMS with the proposed concept of branch pseudo limit used in RT SCED. Part-I of this paper presents the methodology while Part-II includes detailed results analysis. It is demonstrated that Procedure-A can effectively eliminate the potential post-contingency overloads identified by RTCA and Procedure-B can achieve significant congestion cost reduction with consideration of CTS in RT SCED. Numerical simulations also illustrate that integrating CTS into RT SCED would improve social welfare.