Abstract
Voltage instability has long been suspected to be the main cause of voltage collapse and islanding of power systems. Voltage stability analysis is thus very crucial in ensuring equilibrium in a power system. This paper presents a study to assess the steady-state voltage stability of the Kenyan high voltage transmission network. In this paper QV modal analysis is used to identify the weakest buses in the system and also determine the critical lines that are important to the voltage stability of the system. PV and QV curve techniques are then used to determine the voltage stability margins of the weak buses identified. A contingency study is also done to determine the effect of removing one of the critical lines in the network on the voltage stability margins of the system. DIgSILENT Powerfactory simulation software is used in the study. The analysis is performed on the 2016 model of the Kenyan Power System.
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