Triple Three-Phase Diode Rectifier-Connected Wound Rotor Non-Overlap-Winding Synchronous Generator for DC Grid Wind Turbine Systems

In the search for non-permanent magnet wind generator solutions, this paper presents a performance evaluation of a wound rotor synchronous generator (WRSG) with a nonoverlapping stator winding for DC grid wind turbine systems. The focus is to compare the WRSG performance when connected to single and triple three-phase rectifier configurations of DC grids, particularly in offshore wind farms, where DC grids are gaining prominence. The evaluation is conducted through simulations using Ansys Maxwell/Simplorer and experimental measurements. Both the simulations and experiments are performed on a WRSG prototype featuring a 16/18 pole/slot combination. The findings present a comprehensive analysis of various performance indicators,including torque, voltage and current waveforms, as well as efficiency. The results show that the triple rectifier configuration has a significant higher efficiency than the single rectifier configuration.