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Smart grid emergency control strategy for Load Tap Changers

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3 Author(s)
Baalbergen, J.F. ; Fac. of Electr. Eng., Delft Univ. of Technol., Delft, Netherlands ; Gibescu, M. ; van der Sluis, L.

In this paper a strategy is introduced for emergency control of Load Tap Changers (LTCs) to prevent the system from voltage collapse. The method is based on the fact that the power consumed by constant current and constant impedance loads can be lowered by decreasing the secondary voltage of the LTC. This idea is used to develop a method of indirect load shedding. This method calculates, based on a model of the connected load, the voltage set-point of the secondary side of the LTC for a given amount of load that needs to be shed. With simulations it is demonstrated that a LTC can be applied for load relief using the proposed method. A sensitivity analysis is done to study the effect of an error in the load model parameters. Furthermore it is proven that the method can be used to prevent the power system from a typical voltage instability. Finally a proposal for the implementation in a smart grid multi-agent system is presented.

Published in:

PowerTech, 2011 IEEE Trondheim

Date of Conference:

19-23 June 2011

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