Optimal scheduling of reconfigurable grids considering dynamic line rating constraint

• Published in: IET generation, transmission & distribution transmission & distribution, 2020-05, Vol.14 (10), p.1862-1871
• Main Authors: Mohamed, Mohamed A, Awwad, Emad Mahrous, El-Sherbeeny, Ahmed M, Nasr, Emad Abouel, Ali, Ziad M
• Format: Article
• Language: English
• Subjects: 118‐bus IEEE test systems; 6‐bus IEEE test systems; approximation theory; Bender decomposition approach; cost reduction; DTLR; dynamic line rating constraint; dynamic thermal line rating; electrical power losses; heat balance equation; heat losses; improved linear AC optimal power flow; linear approximation; linear model; load flow; operating cost reduction; optimal scheduling; optimisation; overhead transmission lines; power flow; power generation dispatch; power generation economics; power generation scheduling; power generators; power overhead lines; power switches; power system automation; power system security; reconfigurable grids; Research Article; SCUC problems; security constraint; Security‐Constrained Unit Commitment; system losses; system security; thermal power losses; transmission switching tool; TS problems
• ISSN: 1751-8687; 1751-8695; 1751-8695
• DOI: 10.1049/iet-gtd.2019.1570

Power system automation is an effective tool from both economical and technical aspects to improve the optimal operation of power generators. In this regard, Security Constrained Unit Commitment (SCUC) incorporating Dynamic Thermal Line Rating (DTLR) of overhead transmission lines can boost the system security effectively. Using Transmission Switching (TS) tool in SCUC problems leads to cost reduction. Still, one of the main challenges arisen in TS problems is the excessive number of switching in lines, which decreases the lifespan of power switches. In this paper, an Improved Linear AC Optimal Power Flow (ILACOPF) is proposed by using TS and considering Heat Balance Equation (HBE) as a security constraint. Merging dynamic thermal line rating (considering the weather conditions) in SCUC with TS, besides decreasing the number of switching and increasing the lifespan of power switches, causes a remarkable reduction in operating costs. In this power flow, system losses are modeled by linear formulations. Moreover, a linear approximation of the heat losses due to power flow through lines is proposed. To solve the proposed model, Benders' decomposition approach is applied. The performance of the proposed framework has been evaluated on 6-bus and 118-bus IEEE test systems.