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Automatic schemes for including generator Q and transformer tap limits in the fast decoupled load flow method

Chakrabarty, Shantanu and Sundaresh, Lakshmi and Rao, PS Nagendra (2019) Automatic schemes for including generator Q and transformer tap limits in the fast decoupled load flow method. In: IET GENERATION TRANSMISSION & DISTRIBUTION, 13 (12). pp. 2533-2542.

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Official URL: https://doi.org/ 10.1049/iet-gtd.2018.6462


This study proposes a modified formulation for the popular fast decoupled load flow method to facilitate automatic incorporation of reactive power flow related constraints, i.e. generator reactive power and in-phase transformer tap limits. This formulation has been developed by viewing each device constraint as a set of complementary conditions and adopting the complementarity framework to define one equation to represent this set. The original set of load flow equations is augmented with this set of new equations representing the device constraints and solved to get the adjusted solutions directly. This approach is a significant departure from all the earlier approaches. The earlier approaches generally adopt a two-stage scheme. In the first stage, an approximate unadjusted solution is obtained and in the next stage, adjustments are attempted by ad hoc schemes. The new formulation presented here permits handling both the reactive power related constraints simultaneously. However, it can also be used in situations where only one type of adjustment is needed. Two alternate algorithms in complementarity framework based on mixed complementarity problem and non-linear complementarity problem formulations are presented here. Simulation results are presented to provide evidence of the impressive performance of the new algorithms as compared with the existing ones.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to INST ENGINEERING TECHNOLOGY-IET
Keywords: load flow; reactive power; power transformers; automatic schemes; including generator; transformer tap limits; modified formulation; popular fast decoupled load flow method; automatic incorporation; reactive power flow; generator reactive power; in-phase transformer; load tap; device constraint; complementarity framework; original set; load flow equations; adjusted solutions; earlier approaches; two-stage scheme; approximate unadjusted solution; ad hoc schemes; flow related constraints; mixed complementarity problem; nonlinear complementarity problem formulations
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 20 Dec 2019 10:26
Last Modified: 20 Dec 2019 10:26
URI: http://eprints.iisc.ac.in/id/eprint/63270

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