An Overview on Voltage Stability Indices as Indicators of Voltage Stability for Networks with Distributed Generations Penetration

Abstract

Abstract:The increase in Distributed Generation (DG) penetration in distribution network can be used as a means of addressing the increasing load demand without the upgrade of transmission lines. However, this increasing demand despite the supplementary supply from DG sources can cause the system to operate at its maximum capacity or at point of voltage collapse. It therefore, becomes necessary to determine the maximum capacity limit of the system before voltage collapse occurs due to instability. This paper reviews the concept of voltage stability index (VSI) as an indicator of a weak bus that is closed to its maximum allowable limit or the most critical line to voltage collapse in a network. The review also evaluates various voltage stability indices including those originally developed for transmission systems. Subsequently, their adequacies are quantitatively compared and from the comparison, it is observed that the existing voltage stability indices would be inadequate for assessing the most sensitive bus or line on the verge of voltage collapse for modern distribution systems.

Application of static synchronous compensator and energy storage system for power system stability enhancement

“…Further it is stated that the energy storage technology will be the key to the future development of renewable energy. In [5] some of the commercial successes in electric power storage technologies have been discussed and it also discusses some of the emerging applications in power storage like wind farm power stabilization. The report [6] provides a catalogue of the various current technologies (steam, hydro, wind, etc., and storage being one of them).…”

“…The transmission of the power along a distance in the grid requires a stable system and voltage profile, which can only be maintained with the application of static synchronous compensator (STATCOM). This system is made of components of Var sources (capacitances, inductances) [4,5].…”

Prevention of voltage instability in radial distribution system during fault occurrence

“…For this reason, the power engineer must observe closely for the voltage stability of the power system, and to be prepared to perform voltage stability analysis, using all the afformentioned methods. A quick survey on voltage stability that related of Distributed Generated (DG) with presented network considered by Haruna Musa [6]. There are great improvements provided in term of power quality that has a positive impact on the stability of voltage over the network.…”