Title: Identification of weak buses and elements participation in voltage instability of large multi bus power system

Authors: S.D. Naik; M.K. Khedkar; S.S. Bhat

Addresses: Department of Electrical Engineering, Shri Ramdeobaba Kamla College of Engineering and Management, Nagpur-440013, India ' Department of Electrical Engineering, Visvesvaraya National Institute of Technology, Nagpur-440020, India ' Department of Electrical Engineering, Visvesvaraya National Institute of Technology, Nagpur-440020, India

Abstract: In heavily loaded systems, voltage stability limit is usually dominant and voltage instability is usually observed following large disturbance. This is typically the case in the deregulated environment as the transmission systems are operating under more stressed condition due to increased transaction level associated with open access. In this paper simple voltage stability analysis is carried out for a multibus power system (26 bus system) using V-Q sensitivity analysis and modal analysis. The bus participation, line participation and generator participation in critical mode of voltage stability is determined. This is useful for implementation of contingencies in power system for further study of voltage stability. A novel idea of small increment in reactive power and distributing the same in proportional to bus participation factor for calculation of generator and line participation is presented. Also the correlation between the voltage sensitivity factor and bus participation factor is established for identification of weak buses.

Keywords: voltage stability; shunt compensation; voltage sensitivity factor; VSF; reactive power; voltage instability; weak elements; modal analysis; sensitivity analysis; element participation factor; multibus power systems.

DOI: 10.1504/IJPEC.2013.057030

International Journal of Power and Energy Conversion, 2013 Vol.4 No.4, pp.339 - 354

Received: 22 Aug 2011
Accepted: 28 Feb 2012
Published online: 31 Mar 2014 *

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