Performance Analysis of a 5-MW Design-Optimized Triple-Three-Phase Wound Rotor Synchronous Wind Generator for DC Grids

Abstract

This paper considers a 5-MW triple-three-phase wound rotor synchronous generator (T-WRSG) directly connected via diode rectifiers to a DC grid wind energy system. The WRSG typically has a relatively large synchronous reactance, which limits its effective use with diode rectifiers. Therefore, the focus of this paper is the design, optimization, and performance analysis of the 5-MW T-WRSG with a relatively small synchronous reactance. This T-WRSG has a 16/18 pole/slot, double-layer configuration with non-overlapping windings. An initial optimization using the computationally efficient coordinate descent method was used to obtain a near-optimal solution of the T-WRSG. Then, the non-dominated sorting genetic algorithm was used to conduct the final optimization and obtain the optimum T-WRSG. The results of two-dimensional finite-element analysis (FEA) demonstrate the effectiveness of the 5-MW 16/18 T-WRSG for use with diode rectifiers in DC grid wind energy systems.