Dynamic analysis of Southern Africa power pool (SAPP) network

Abstract

Synchronous generators are interconnected into the regional power transmission network to improve reliability, enhance the security of supply, trade of electricity and share the available natural resources for energy fuel supply. The interconnected power system experiences disturbances due to load variations and faults and causes stress on the generators to control and remain in synchronism. The study has analyzed the natural damping oscillations emanating from a change of load and disturbance in the interconnected power system of a modelled SAPP network. The SAPP grid was modelled in DigSilent Powerfactory and used electromagnet transient and modal analysis tools to simulate the behavior of rotor angle and frequency in relation to speed in the interconnected synchronous generators. The simulated results indicated that frequency deviated due to load change and faults. It affected also the behavior of the rotor angle requiring to re-tune its control system and provide real time monitoring instruments.