Analysis of Small Signal Stability in DFIG Integrated Power System

Abstract

The variable renewable energy sources such as solar photovoltaic (PV) and wind system will have a major contribution in modern power systems in the foreseeable future. Solar PV and wind are different from conventional generators such as thermal, gas, and diesel due to their variable and uncertain power output which depends upon local geographical topology. Both wind and solar PV are integrated with the main grid with the help of inverters which have zero inertia and physical properties of the system is entirely depends upon the controller design. In this paper, the small signal stability for type III or doubly fed induction generator (DFIG) integrated test system is investigated. The Kundur’s two areas four machine power system is utilized as a test system. To investigate the impact of type III wind turbine on small signal stability of test system, the synchronous generator in two area system is replaced by a type III wind turbine for each scenario. The results have been investigated using both time domain and eigenvalue analysis. Moreover, the power system stabilizer (PSS) is also used with synchronous generators in those areas where the integration of type III wind turbine has increased the system oscillations. All simulation results are obtained using DigSlient PowerFactory software.