Optimal Capacity Expansion in Electric Power Subtransmission Networks
Publication: Journal of Energy Engineering
Volume 135, Issue 3
Abstract
A procedure is proposed to determine where and when to increase the capacity of lines and transformers in a power subtransmission network. The expansion plan must minimize cost while supplying the demand for energy over a time horizon, keeping the quality and reliability standards of the network and minimizing the impact over the environment. The procedure is iterative and takes into account AC flows, reliability analysis, different scenarios, demand uncertainty, discrete investment costs, voltage constraints, capacity, and power factor. A significant contribution of this procedure is that, along with the expansion plan, it considers the optimization of the operation, specifically the movement of transformer taps and the location and sizing of reactive banks. This allows significantly reducing or delaying the investment, thus reducing its present value. The approach ensures convergence when computing the power flows and allows making an analysis of the effects of distributed generation and, if necessary, load curtailment. The model is tested on the power subtransmission network of the most important electric power distribution company in Chile, serving a city of 6 million people.
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Acknowledgments
We gratefully acknowledge Chilectra for allowing us to use their subtransmission network for the real case analysis. We also acknowledge the support provided by FONDECYT (Grant No. UNSPECIFIED1070741) and the Instituto Milenio “Complex Engineering System.” We thank the Centro de Modelamiento Matemático at the Universidad de Chile for providing us with computing support.
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Information & Authors
Information
Published In
Journal of Energy Engineering
Volume 135 • Issue 3 • September 2009
Pages: 98 - 105
Copyright
© 2009 ASCE.
History
Received: Jun 12, 2008
Accepted: Feb 9, 2009
Published online: Aug 14, 2009
Published in print: Sep 2009
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