Steady‐state model of DFIG‐based wind power plant for load flow analysis

Abstract

Abstract The steady‐state models of electric power system components are crucial for the analysis of system load flow or preliminary study of the system stability. At present, penetration of wind power plant (WPP) in power system continues to increase, and its modelling development and investigation is also still a very active research area. This paper proposes a simple technique for modelling doubly fed induction generator (DFIG)‐based WPP to be used in power system steady‐state (i.e. load flow) studies. In the proposed method, derivation of the WPP mathematical model is carried out based only on power formulations of the WPP, namely, DFIG power output and turbine mechanical power input formulas. Detailed power converter modelling, which is usually quite complicated, is not required in the proposed method. Case studies are also presented in this paper where the proposed model is applied to a simple system as well as to multi‐bus systems. In the studies, the model is tested for various wind speeds ranging from 5 to 12 m/s. With these wind speeds, it is found that power outputs of the WPP vary around 0.1 to 2.1 MW. This result also indicates that the proposed DFIG model is valid both for sub‐synchronous and super‐synchronous conditions.

Keywords

• Wind power plants
• Asynchronous machines
• Control of electric power systems