Analysis of Voltage Stability Indices for Radial Distribution Systems

Vol.2 No.1

Year: 2008

Issue: Jul-Sep

Title: Analysis of Voltage Stability Indices for Radial Distribution Systems   

Author Name: S. Sivanagaraju, G.Sreenivasan , K. Nagaraju   

Synopsis:   

This paper presents two voltage stability indices for the analysis of radial distribution systems, namely VSI (Voltage Stability Index) and FVSI (Fast Voltage Stability Index), which are more sensitive to voltage collapse. Analysis of these indices is carried out with respect to changes in the reactive power of the system. Five types of load modeling, namely Constant Power, Constant Current, Constant Impedance, Exponential and Composite load models are considered for the purpose of stability analysis and comparative analysis is presented. For analyzing the above, a load flow technique is proposed, which involves a simple algebraic equation for calculating the receiving end voltage. The effectiveness of the proposed technique is tested on 15 node and 69 node radial distribution systems