Real-Time Simulation of PWM Power Converters in a Doubly-Fed Induction Generator Using Switching-Function-Based Models

This paper presents a study on the real-time simulation of power electronic PWM converters in wind generators using switching-function-based models instead of detailed switch models. Basic problems in real-time simulation of PWM converters connected to a power system are identified and possible solutions are discussed. Converter models using switching functions and an interpolation method are designed and evaluated. An application example consisting of a wind-turbine-driven doubly-fed induction generator is implemented in a real-time simulator. Simulation results are presented and the validity of the converter models is discussed.