Steady-State Voltage Stability Assesment of the Kenyan High Voltage Transmission Network

Ombuki, Brighton; Orenge, Roy

doi:10.1109/africon46755.2019.9133898

Cited by 3 publications

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“…However, because of the drawbacks of some of these methods as discussed in Table 3, further studies have been carried out employing the combination of one or more methods so as to get more information and greater degree of accuracy in voltage stability studies. Mao et al [38][39][40] use a combination of powervoltage curves and modal analysis in the voltage stability assessment of power systems with the later focusing on a microgrid system. In [41,42], the voltage stability sensitivity index is used to identify the weakest bus in the IEEE 14 bus system which is further analysed using power-voltage curves to identify the voltage collapse point.…”

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confidence: 99%

Static Voltage Stability Assessment of the Kenyan Power Network

Mogaka

Orenge

Ndirangu

2021

Journal of Electrical and Computer Engineering

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In recent years, the Kenyan Power Network has witnessed large growths in load demand. Although the increased load demand has somewhat been matched with an increase in transmission and generation capacity, the rate of expansion has not been matched with the rate of increase in load demand due to economic, environmental, and geographical constraints. This has led to the system being prone to instability since it is being operated under stressed conditions. In the recent past, several studies have been carried out on voltage stability analysis and improvement using various conventional methods. However, conventional methods have various limitations in their utilization for voltage stability analysis. One solution to overcome these limitations is to employ a combination of one or more methods so as to get more information and greater degree of accuracy in voltage stability studies. In this paper, a methodology is proposed involving the combination of QV modal analysis, sensitivity analysis (VQ) and power-voltage curves in assessing the static voltage stability analysis taking a case study of the Kenyan Power Network. V-Q sensitivity analysis and QV modal analysis have been used to identify the load regions most susceptible to voltage instability and the corresponding weak buses in the network for various V-Q responses. Reactive power loss sensitivities for branches in the network have been used to determine the critical (weak) lines in the network. Loading margins (LM) and voltage stability margins (VSM) have then been used to determine the proximity to voltage collapse of the voltage weak buses identified by QV modal analysis. The effect of tripping one the critical lines on the voltage weak buses is also investigated. The current high voltage power network under the average peak loading conditions during the year 2019 is considered for the study. The paper also reviews existing voltage stability analysis methods and their limitations.

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