Sensitivity Analysis and Design Optimization of a New Hybrid-Excited Dual-PM Generator With Relieving-DC-Saturation Structure for Stand-Alone Wind Power Generation

This article proposes a new hybrid-excited dual-permanent-magnet generator with the relieving-dc-saturation (RDCS) structure for stand-alone wind power generation. The proposed generator integrates the stator dc source and rotor permanent-magnet (PM) source in a single brushless structure, which enables coordinated power generation and flexible power adjustment. Moreover, considering the parasitic saturation effect in the stator core caused by the dc field source, a constant PM bias is introduced at the stator side to construct an RDCS structure, so that the core utilization ratio is improved as well as the generator power density. In this article, the generator structure and the operation principle are introduced. Some leading design parameters are determined based on the sensitivity analysis. A finite element and genetic algorithm combined method is further adopted to realize a multi-objective design optimization, and the optimal design of the proposed topology is verified to be a potential generator candidate for stand-alone wind power generation.