Assessment of Voltage Stability Indices for Determination of Power System Weak Buses

  • Weldon K. Koskei Jomo Kenyatta University of Agriculture and Technology
  • D. K. Murage Jomo Kenyatta University of Agriculture and Technology
  • Samuel Kangethe Jomo Kenyatta University of Agriculture and Technology
  • Michael J. Saulo Technical University of Mombasa

Abstract

The ever growing population and the high level of industrialization globally has led to increase demand for electric power. However, the expansion of electric power generation as well as transmission and distribution power system has been limited by financial constraints. This has led to operation of power system close to its operating stability limits. This overloaded operation condition of power system leads to instability challenges like voltage instability due to inability of the power system to supply required reactive power. In the case that voltage stability status of a stressful system not determined and the challenges arising not addressed, this can lead to voltage collapse and total blackout of the system. Hence there is need to constantly check the status of voltage stability and determine voltage collapse proximity and plan counter corrective measures accordingly. This paper aims to compare Fast Voltage Stability Index (FVSI) and Line stability Index (). These line voltage stability indices indicates the proximity of power system lines to voltage instability. This will help power system planners and operators in their daily power system operations. The standard IEEE 30 bus power system was used to carry out this research and test performance of these voltage stability indices.
Keywords— Voltage Stability, Voltage Collapse, Fast Voltage Stability Index, Line Stability Index. 
Published
Jul 2, 2018
How to Cite
KOSKEI, Weldon K. et al. Assessment of Voltage Stability Indices for Determination of Power System Weak Buses. Proceedings of Sustainable Research and Innovation Conference, [S.l.], p. 130-134, july 2018. ISSN 2079-6226. Available at: <http://sri.jkuat.ac.ke/ojs/index.php/proceedings/article/view/693>. Date accessed: 21 aug. 2019.