直驅多相（或多繞組）永磁同步發電機在大功率（WM 級）風電系統中具有很好的應用前景，它提供多個隔離電源用于全功率變流器的串并聯混合設計，可以顯著提高變流器的效率。它還可以通過連接級聯式高壓變流器實現無升壓變壓器的技術方案，用于海上風力發電系統。本文提出了一種新型直驅多相高壓永磁同步風力發電機的結構，這種發電機通過定子側串聯的電力電子變流器來實現高壓輸出，因此具有較低的匝間絕緣，這可以提高定子槽的利用率，從而大大減小傳統三相高壓電機的體積和質量。本文主要研究了這種直驅多相永磁同步發電機的優化設計方法，并提出了一種優化設計模型。該優化模型以成本和費效比CPEO=C/(Sn×η)為目標函數（C 為成本，Sn 為發電機容量，η為效率），通過比較的方法來對新型直驅多相高壓永磁同步風力發電機的轉速nN、頻率f 和主要尺寸比Krad 進行最優設計。通過對優化計模型的研究，為大功率直驅多相高壓
永磁同步風力發電機的優化設計提供理論依據。
Abstract: The multiphase direct-drive PMSG is promising when being applied in large wind turbine system (MW). It offers several
isolated power supplies for full-size converters. It’s convenient to combine the basic converters together by series- or parallel-connection
flexibly. Such a combination will improve efficiency of the converters. And it is a kind of basic technology to realize transformerless wind
power conversion system used for offshore wind power plant. The paper proposes a novel structure of the direct-drive multi-phase HV
PMSG that generates high voltage by power electronic converters. As a result, the in-turn insulation requirement of the generator
decreases and the availability of the stator slot increases, that contributes to reduce the bulk and mass of the generator compare with
traditional HV three-phase PMSG. The paper mainly studies optimal design of such a novel generator and presents an optimization model.
The objective function of the model is ratio of cost to energy out (CPEO). CPEO=C/(Sn×η), in which C is cost, Sn generator capacity, η
efficiency. The comparison is carried out respectively to search the optimal design of the generator rotor speed, frequency and the ratio of axial length to air gap diameter. The study presents a theoretical guidance for the optimal design of large direct-drive multiphase PMSG.
關鍵詞：直驅風力發電機；高壓永磁發電機；多相永磁發電機；優化設計
Keywords: direct-drive generator for wind turbine, high voltage permanent magnet generator, multiphase generator, optimal design