Fast static contingency screening based on reactive loss compensation index

Obah, Obinna B; Kim, C.

doi:10.1109/pes.2008.4596183

Cited by 1 publication

(1 citation statement)

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“…More efficient approaches based on sparse vector methods were proposed (Chang and Brandwajn, 1988) including partial matrix re-factorisation and factor update (Chan and Brandwajn, 1986). The difficulty of managing PV-PQ node type switching in the framework of contingency screening is witnessed by two recent papers (Davis and Overbye, 2011;Obah and Kim, 2008); in the former the reactive problem is not considered, while in the latter, a sensitivity method is proposed to correct the outage severity index obtained by a DC load flow computation, but again no PV-PQ type switching is performed.…”

Section: Introductionmentioning

confidence: 99%

Adjusted reactive solutions for multiple power flow computations

Genesi

Montagna

2013

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -The purpose of this work is that of showing some efficient techniques to perform PV-PQ node type switching in multiple power flow computations. Design/methodology/approach -Reactive generation limits of generation buses must be taken into account to obtain realistic power flow solutions. This may result computationally demanding when many power flow computations are required as in contingency screening or Monte Carlo simulations. In the present paper, the implementation of efficient PV-PQ node type switching is examined with particular emphasis on the efficiency of computation. Some different methods are proposed and compared on the basis of computation speed and accuracy. Findings -Tests show the efficiency of the proposed methods with reference to actual networks with up to 800 buses. Originality/value -The classical method of (partial) re-factorisation is not very efficient when many power flow solutions are to be evaluated. In the present work, a different approach is proposed; it is based on grounding each PV node by a fictitious short-circuit branch which is removed when the node type is changed to PQ. This operation is carried out by compensation of the solution and combined with the modifications required for contingency simulation.

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