Dual Three-Level Double-Fed Induction Motor Control Based on Novel Stator Flux Observer

The vector control strategy for double-fed induction motor fed by back-to-Back dual three-level converter was studied in this paper. The accurate observer and effective control of the stator flux for double-fed induction motor has significant sense to the performance improvement of vector control system. In the thesis, two one-stage low-pass filters are adopted instead of the pure integrator in the stator flux observer, which can steady the phase and amplitude. Three-level converter with active front end (AFE) works with unity power factor and low gird side´s harmonic distortions, whose energy can flow in both direction. The result of field running has demonstrated that, the solutions of the vector control strategy for double-fed induction motor has excellent control performance, truly realizing a high degree of integration between speed drives for energy saving and environmentally friendly.