Abstract
The brushless doubly fed generator (BDFG) has been a research focus of wind power generation due to its inherent promising features. Although it is important to consider the effect of losses on the design and analysis of the BDFG, there are a few related comprehensive studies. Moreover, a hybrid rotor is studied to improve the performance of BDFG, which brings greater challenges to the loss calculation. The aim of this paper is to propose the accuracy calculation methods of core loss and copper loss for the studied BDFG with hybrid rotor. The core loss calculation model which taken the influence of harmonics, alternating magnetization, rotating magnetization and two-dimensional magnetic property of material into account is proposed based on the analysis of the magnetic field characteristics. In order to calculate the copper loss considering the skin effect, the inductive current of the assisted cage bars which is difficult to obtain directly is calculated. The accuracy and correctness of the proposed approaches and models are validated by experimental results from a 25kW prototype BDFG with hybrid rotor. In addition, the proposed loss calculation method, especially the core loss calculation model, is also applicable to BDFG with other rotor structure which is operated by the magnetic field modulation mechanism.
Highlights
Recent developments in wind power generation have revitalized research on wind turbine and the problem of how to make wind power system work more efficiently and stably are increasingly prominent [1], [2]
In this paper, the core loss and copper loss of the hybrid rotor brushless doubly fed generator (BDFG) with superior performance are analyzed in detail
An improved E&S core loss calculation model which can take the effect of harmonics, alternating magnetization, rotating magnetization and twodimensional magnetic property into account is proposed
Summary
Recent developments in wind power generation have revitalized research on wind turbine and the problem of how to make wind power system work more efficiently and stably are increasingly prominent [1], [2]. Compared with traditional wind power generators, the brushless doubly fed generator (BDFG) which has the excellent performance of conventional synchronous machine and wound rotor asynchronous machine is more suitable for wind power generation [3], [4]. The direct coupling relationship is non-existent between two sets of stator windings, and the electromechanical energy conversion of BDFG is achieved by the magnetic coupling effect of special rotor [8], [9]. The rotor structure has a signification effect on the operating performance of BDFG
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