Solution of large-scale security constrained optimal power flow by a new bi-level optimisation approach based on enhanced gravitational search algorithm

• Published in: IET generation, transmission & distribution Vol. 7; no. 12; pp. 1481 - 1491
• Main Authors: Jahan, Mohammad Sadegh, Amjady, Nima
• Format: Journal Article
• Language: English
• Published: Stevenage The Institution of Engineering and Technology 01.12.2013; Institution of Engineering and Technology; The Institution of Engineering & Technology
• Subjects: AC network modelling; AC security constraint; Applied sciences; bilevel optimisation approach; constraint handling; Constraints; Convergence; economic dispatch; Electrical engineering. Electrical power engineering; Electrical power engineering; enhanced gravitational search algorithm; Exact sciences and technology; IEEE 118‐bus test system; IEEE 300‐bus test systems; IEEE 57‐bus test system; IEEE 9‐bus test system; IEEE standards; large‐scale security constrained optimal power flow; load flow; Mathematical models; Miscellaneous; multifuel option; operating zone constraint; Operation. Load control. Reliability; optimisation; Optimization; polish 2746‐bus test system; Power flow; power generation dispatch; power generation economics; Power networks and lines; power system; power system security; power system simulation; Prohibited operating zones; SCOPF; Search algorithms; search problems; Security; thermal power stations; thermal unit; valve loading effect; valves; thermal power stations; SCOPF; power system; power system simulation; valves; IEEE 57-bus test system; valve loading effect; large-scale security constrained optimal power flow; economic dispatch; power generation economics; thermal unit; optimisation; IEEE 118-bus test system; AC security constraint; IEEE standards; constraint handling; search problems; enhanced gravitational search algorithm; IEEE 300-bus test systems; bilevel optimisation approach; IEEE 9-bus test system; power system security; power generation dispatch; AC network modelling; polish 2746-bus test system; multifuel option; operating zone constraint; load flow; Dispatching problem; Alternating current network; Optimization method; Polishing; Modeling; Search algorithm; Constrained optimization; Bus system; Electrical network analysis; Optimal power flow; Electrical network; Convergence rate; Valve; Economic aspect; Economic impact; Safety; Comparative study
• ISSN: 1751-8687; 1751-8695
• DOI: 10.1049/iet-gtd.2012.0697

Security constrained optimal power flow (SCOPF) is a key operation function for modern power systems. In this study, a new bi-level optimisation approach is proposed to solve this problem considering a comprehensive SCOPF model, including, for example, valve loading effect, multi-fuel option and prohibited operating zone constraints of thermal units as well as AC network modelling and AC security constraints. Economic dispatch is solved in the lower level of the proposed approach and using its results as the initial solution, SCOPF is solved in the upper level with high convergence rate. For the both levels, a new enhanced gravitational search algorithm is suggested as the optimisation tool. The proposed bi-level approach is tested on 9-bus, IEEE 57-bus, IEEE 118-bus, IEEE 300-bus and polish 2746-bus test systems. Obtained results from the proposed approach for the test cases are compared with the results of other SCOPF solution methods and published literature figures. These comparisons confirm the validity of the developed approach.