Small Signal Stability of Power Systems With Increased Converter Based Power Production

Abstract: The aim of this project is to analyze how increasing the share of converter-based power production in a power system affects the small signal stability. The project also aims to stabilize systems using Power System Stabilizers (PSSs), and examine the effect of two different types of power electronic converters: grid following (GFL) and grid forming (GFM). To do this, a short-circuit fault is simulated in a two-area four-machine power system using DIgSILENT PowerFactory. The project examines how replacing one of the synchronous machines with a converterbased power source affects the system’s stability. Modal analysis is used to assess the small signal stability, as well as to tune the PSS. In the project PSSs are successfully used to stabilize systems, both with and without converter-based power production. The study also finds that implementing power production using GFL worsens the small signal stability while GFM improves it.