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Value-based transmission planning and the effects of network models

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2 Author(s)
S. N. Siddiqi ; Resource Planning & Regulatory Div., Lower Colorado River Authority, Austin, TX, USA ; M. L. Baughman

A value-based automated transmission system planning model is presented in this paper and the impact of the various network representations on the results of the model is discussed. Value-based integrated resource planning provides a "societal cost" (utility operation and investment costs plus customer outage costs) minimizing composite generation-transmission system expansion plan. The model trades-off and compares the costs and benefits of alternative generation and transmission resources using a consistent economic and engineering criterion in order to determine an "optimal" resource expansion plan. The generalized Benders decomposition algorithm with "importance sampling" used to solve the problem enables the model to estimate certain average information about scenarios or contingencies by examining only a very small fraction of all the scenarios or contingencies. The impacts of system resources upon both real and reactive power can be analyzed when using the AC power flow equations. It is concluded that for transmission system planning where reactive power flows and voltage constraints are important, it is imperative that an AC power flow model be used. The combination of AC power flow and linearized power flow models, with linearization about the solution of the AC power flow model, was found to be a promising compromise between accuracy and computation time.

Published in:

IEEE Transactions on Power Systems  (Volume:10 ,  Issue: 4 )