Modeling of the Wind Turbine With a Doubly Fed Induction Generator for Grid Integration Studies

TLDR

Variable‑speed wind turbines using doubly‑fed induction generators are attractive for their power quality, efficiency, and controllability, yet existing fundamental‑frequency models are complex and computationally heavy due to detailed power‑converter simulation. The study aims to develop a simplified DFIG wind turbine model that represents the power converter as a controlled voltage source to regulate rotor current for real and reactive power commands. The model is formulated as a conventional generator model with the converter represented by a controlled voltage source, enabling straightforward integration into PSS/E and validation against a detailed DIgSILENT model through simulation of the Arklow Bank Wind Farm interacting with the Irish National Grid. The simplified model accurately reproduces the behavior of the detailed DIgSILENT model while offering reduced computational burden, and its limitations and applicable scenarios are delineated.

Abstract

Due to its many advantages such as the improved power quality, high energy efficiency and controllability, etc. the variable speed wind turbine using a doubly fed induction generator (DFIG) is becoming a popular concept and thus the modeling of the DFIG based wind turbine becomes an interesting research topic. Fundamental frequency models have been presented but these models are often complex with significant numerical overhead as the power converter block consisting of power control, rotor side and grid side converter control and DC link are often simulated in detail. This paper develops a simple DFIG wind turbine model in which the power converter is simulated as a controlled voltage source, regulating the rotor current to meet the command of real and reactive power production. This model has the form of traditional generator model and hence is easy to integrate into the power system simulation tool such as PSS/E. As an example, the interaction between the Arklow Bank Wind Farm and the Irish National Grid was simulated using the proposed model. The model performance and accuracy was also compared with the detailed model developed by DIgSILENT. Considering the simplification adopted for the model development, the limitation and applicability of the model were also discussed in this paper.