Analysis of Dynamic Voltage and Frequency Oscillations in Low-Inertia Power Systems

In this paper, the effect high penetration of renewable energy resources on the transmission network stability is investigated. By increasing the number of inverter-based resources, the overall inertia of the network decreases and the stability of the network is affected. In order to analyze the behavior of low-inertia grids, initially according to the type of traditional power plants and wind turbines, appropriate dynamic modeling has been done. Then, by creating a short circuit, the effect of increasing the penetration of wind turbines on the voltage and frequency stability is evaluated. The effect of duration and location of the fault on network stability has also been investigated. The study network is a modified Kundur’s four-machine system modeled in PowerFactory.