DFIG based wind turbine system modeling in the Real Time Digital Simulator

Abstract

This paper focuses on modeling Type 3 (Doubly Fed Induction Generators based) wind generation systems in the Real Time Digital Simulator (RTDS). It discusses the underlying converter and controller design algorithms and topologies. An alternative to the conventional Phase Locked Loop (PLL) tracking of rotor frequency is implemented. A comparative analysis of the performance of an averaged model and the corresponding switching model is presented. The averaged model is used to model an aggregate 10-generator equivalent model. The system is connected to a 22kV collector and then tied to the 230kV grid. This model is a great asset to understand dynamics, and the un-faulted and faulted behavior of aggregated and single turbine Type 3 systems. The models facilitate testing the response of conventional protection schemes by modern protection relays in real time using the RTDS.