Consideration of series compensation in the enhancement of techno-economic worth of higher voltage transmission line overlay

Nhlanhla Mbuli, Jan Harm C. Pretorius

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A higher voltage transmission line overlay that is in parallel with an existing system of lines may not enhance the overall performance of a system to expected levels because of its impedance's relationship with that of the existing system. Here, the authors considered the use of series compensation in the overlay in order to enhance the technical and economic performance of the overall system. The impact of various levels of series compensation on technical performance of the system (i. e., distribution of power flows, active power losses, and voltage stability limits) was studied. In addition, the economic assessment of such compensation was also evaluated, considering the cost of series compensation versus the benefits of reduced active power losses and improved reliability of the system due to increased power transfer. The study showed that by using series compensation, the utilisation of a higher voltage transmission line overlay can be enhanced. In addition, the overall system technical performance can be improved by reducing operating cost of losses and enhancing reliability due to increased transfer limits for various network conditions. Also, it was shown that certain levels of compensations may be economically justified if the monetary worth of reduction in losses and enhanced reliability are weighed against the cost of series compensation.

Original languageEnglish
Pages (from-to)1379-1388
Number of pages10
JournalInternational Review of Electrical Engineering
Issue number4
Publication statusPublished - 2013
Externally publishedYes


  • Expected energy at risk (EEAR)
  • Expected energy not served (EENS)
  • Higher voltage transmission line overlay (HVTLO)
  • Losses
  • Reliability
  • Series compensation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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