Model Predictive Control for DFIG-based Wind Turbines with NPC Voltage Source Converter

This paper deals with high power wind turbines with doubly-fed induction generators and investigates the Model Predictive Control (MPC) approach for a power converter system with three-level Neutral-Point Clamped (NPC) topology. The modeling of each system component is presented. A simulation study provides insight on the operational performance of the implemented MPC, highlights both, its advantages but also its challenges. The most commonly applied field oriented control is given as a comparative reference. Selected performance indicators are determined for the entire operation range and show, that the MPC scheme in its simplest form can operate with comparatively low average switching frequencies to relax thermal loading in the power converter system, although a compromise need to be made with respect to mechanical loading and power quality issues. MPC still has great potential in improving overall operational performance.

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