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An Interior Point Method based Reactive Optimal Power Flow Incorporating Margin Enhancement Constraints  

Song Hwa-Chang (School of Electronic and Information Engineering, Kunsan National University)
Lee Byong-Jun (Advanced Power System Research Center(APSRC), Korea University)
Moon Young-Hwan (Testing & Evaluation Division, Korea Electrotechnology Research Institute)
Publication Information
KIEE International Transactions on Power Engineering / v.5A, no.2, 2005 , pp. 152-158 More about this Journal
Abstract
This paper describes a reactive optimal power flow incorporating margin enhancement constraints. Margin sensitivity at a steady-state voltage instability point is calculated using invariant space parametric sensitivity, and it can provide valuable information for selection of effective control parameters. However, the weakest buses in neighboring regions have high margin sensitivities within a certain range. Hence, the control determination using only the sensitivity information might cause violation of operational limits of the base operating point, at which the control is applied to enhance voltage stability margin in the direction of parameter increase. This paper applies an interior point method (IPM) to solve the optimal power flow formulation with the margin enhancement constraints, and shunt capacitances are mainly considered as control variables. In addition, nonlinearity of margin enhancement with respect to control of shunt capacitance is considered for speed-up control determination in the numerical example using the IEEE 118-bus test system.
Keywords
Margin enhancement constraint; reactive optimal power flow; parametric sensitivity; voltage stability;
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