S. Silambarasi, T. Venkatesan, K.S. Rangasamy College of Technology, Namakkal, Tamilnadu, India.
DOI : 01.0401/ijaict.2015.09.04
International Journal of Advanced Information and Communication Technology
Received On : July 16, 2017
Revised On : August 19, 2017
Accepted On : September 12, 2017
Published On : October 05, 2017
Volume 04, Issue 10
Pages : 746-750
Abstract
Security is one of the important issues in power system. In this paper voltage constraint is incorporated with Security Constrained Unit Commitment formulation to maintain the voltage security. The objective is to minimize the total production cost considering the voltage security. Lagrangian Relaxation based approach is proposed to determine the Voltage Security Constrained Unit Commitment (SCUC) considering the thermal unit. Lagrangian formulations are applied to relax the constraints with objective function using multipliers. Lagrangian multiplier is adopted to deal with coupling constraints. Using Lagrangian Relaxation, the problem is decomposed into two problems. The master problem solves unit commitment with prevailing constraints. The sub problem minimizes the violations of voltage constraints. In order to maintain the voltage security when the voltage is high generation of reactive power is done and when the voltage is low absorption of reactive power is done. The simulation provides some analysis of the proposed method with IEEE 39 bus system with 10 generating units.
Keywords
Security constrained unit commitment (SCUC), Lagrangian relaxation (LR), Unit commitment problem (UCP).
Cite this article
S. Silambarasi, T. Venkatesan, “Lagrangian Relaxation based Security Constrained Unit Commitment Considering Voltage Constraint” INTERNATIONAL JOURNAL OF ADVANCED INFORMATION AND COMMUNICATION TECHNOLOGY, pp.746-750, October 05, 2017.
Copyright
© 2017 S. Silambarasi, T. Venkatesan. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.