DocumentCode :
1577540
Title :
The effect of dynamic security constraints on the locational marginal prices
Author :
Amarasinghe, L.Y.C. ; Jayasekara, B. ; Annakkage, U.D.
Author_Institution :
Manitoba Univ., Winnipeg, Man., Canada
fYear :
2005
Firstpage :
370
Abstract :
In a restructured power system, locational marginal prices (LMP) are important pricing signals to the participants. LMP at a given node of a power system is the incremental cost of supplying power at that node. In a lossless system with no active constraints, the LMPs at all the nodes are equal. However, due to the losses in the power system, the LMPs at different nodes is different. Any operating constraint such as line flow limits also contribute to the LMP at a node. This paper investigates the effect of a dynamic security constraint on the LMPs. The transient stability margin expressed as a function of nodal voltages and phase angles, is used as a constraint in an optimal power flow (OPF) program to determine the LMPs at all the nodes of a power system. The Lagrange multiplier associated with the transient stability constraint gives the marginal cost of the transient stability constraint. A case study on the New England 39 bus system is presented to demonstrate the effect of the dynamic security constraint on the LMPs. In a nodal pricing scheme, any active constraint results in an additional revenue to the system operator. This revenue, known as the network rental, is also investigated in the paper.
Keywords :
load flow; power system economics; power system security; power system transient stability; pricing; Lagrange multiplier; New England 39 bus system; dynamic security constraint; dynamic security constraints; locational marginal prices; nodal pricing scheme; optimal power flow program; restructured power system; transient stability margin; Costs; Lagrangian functions; Load flow; Power supplies; Power system dynamics; Power system security; Power system stability; Power system transients; Pricing; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Engineering Society General Meeting, 2005. IEEE
Print_ISBN :
0-7803-9157-8
Type :
conf
DOI :
10.1109/PES.2005.1489395
Filename :
1489395
Link To Document :
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