成果報告書詳細
管理番号20140000000315
タイトル*平成25年度中間年報 風力等自然エネルギー技術研究開発 風力発電高度実用化研究開発 10MW超級風車の調査研究(発電機)(2)
公開日2014/7/5
報告書年度2013 - 2013
委託先名株式会社前川製作所
プロジェクト番号P13010
部署名新エネルギー部
和文要約和文要約等以下本編抜粋:
1. 研究開発の内容及び成果等
(1)研究開発の内容
大型風車用超電導発電機の電磁設計を行ったところ、空心コイル方式(回転子のみ超電導)では発電機の超小型軽量化が可能であるものの、高価な高温超電導線材を大量に使用するため、3〜4 億円というコスト制約のある10 MW級発電機の実現は困難である。そこで、回転子に鉄心利用超電導コイルを用いた試算を行ったところ、従来型発電機の半分程度に軽量化できることが明らかとなった。この場合、鉄心(インナーヨーク)全体を冷却せず、超電導コイルのみを冷却する独自のコイルモジュール方式を採用し冷却負荷の最小化を図ることで10 MW超級風車用超電導発電機実現の可能性があることが明らかとなった。本調査研究は、10 MW超級風車のキーコンポーネントと考えられる鉄心利用超電導発電機用コイルモジュール、超電導発電機用高信頼性冷凍機、超電導回転子用冷媒給排装置の研究開発を行い、その成果を基に発電機全体の評価を行って、10 MW超級風車に用いる超電導発電機の実現可能性を実証することを目的とする。
この中で当社は超電導発電機用高信頼性冷凍機の研究開発を行う。本研究開発では、冷却温度 20 K-40 K、冷却能力1 kW級で、ナセル内に設置可能な寸法を有し、3年以上メンテナンスフリーな高信頼性冷凍の開発を目標に、冷凍機のシステム設計、圧縮機、膨張機の設計を行う。最も重要な回転軸系について、高速モータドライブの特性解析と設計へのフィードバックを行い損失低減・効率向上を図るともに、回転軸系(軸受、モータ、インバータ)の試作、要素試験を行う。小型・高効率な熱交換器の設計も行い、それらを総合して、冷凍機の体格・効率・メンテナンス性・経済性等を示す。
英文要約Title : Advanced Practical Research and Development of Wind Power Generation. Advanced Practical Development of Wind Turbine Components. Research on Over 10 MW Class Wind Turbines -Generator (FY2013-2014) Annual Report

To manufacture a superconductive 10 MW wind power generator it is needed to make a module of high temperature superconducting coils with an iron yoke which is cooled to 20-40 K using a refrigerator with a cooling capacity of 1 kW. We design a cooling system including a compressor and an expander, aiming at the development of a refrigerator with a cooling capacity of 1 kW and cooling temperatures of 20-40 K which can be built in the nacelle of the windmill and used without maintenance at least for three years. a. Development of a Highly Reliable Refrigerator for HTS Generator 1) Design of Refrigeration System We have chosen helium as a refrigerant and performed heat balance calculations based on a system in which the refrigerant is expanded after being compressed by a three-stage compressor, some of which is then used to cool the HTS generator. 2) Specifications of Compressor and Expander The compressor and expander are scheduled to be made on a trial basis in 2014. Since the rotational speed of turbo compressor and expander module is assumed to be about 100,000 rpm for He gas, it is essential to cope with problems caused by high-speed rotation especially at bearings, motors and inverters. To achieve high speed and high efficiency it is also necessary to optimize blades and develop high-speed built-in motors, using magnetic bearings. Since the parts of the rotators undergo enormous centrifugal forces, they should be chosen based on their physical properties to ensure that they do not deform or break under rotation. Especially the parts of the expander need extra care, as they are exposed to temperature below 20 K. In the trial design of our turbo compressor and expander, we designed the blades and determined the rotational frequencies and rated outputs such that their adiabatic efficiencies may be greater than 70%. The cooling capacity of the refrigerator is set to be 0.5 kW which is half of our target value 1 kW. In our turbo compressor and expander, high-speed built-in motors and magnetic bearings are placed between the first and second compressors and also between the third compressor and the expander. Through the common motor the energy obtained by the expander is transferred to the third compressor, attempting high efficiency. b. Technology for High-speed Motor Drive for Turbo Compressor and Expander To construct a highly efficient and reliable refrigeration system the efficiency of high-speed motor drive should be improved. We made a system of analytical tools to numerically evaluate the characteristics of HTS motor drive system and investigated the literature on the technology for high-speed motor drive. 1) Analytical System for Examining the Characteristics of High-speed Motor Drive System We introduced the power electronics circuit simulator, based on which an analytical system is made to study the characteristics of high-speed motor drive such as the characteristics of inverter converting power. 2) Literature Survey on High-speed Motor Drive We investigated the domestic and foreign research documents on motor drives with rotational speed greater than 100,000 rpm, focusing on ones with outputs of tens of kilowatts.
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