  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.
