Replacement and enhancement of power electronics at the flywheel machine EZ2

IF 2 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Fusion Engineering and Design Pub Date : 2025-07-01 Epub Date: 2025-04-12 DOI:10.1016/j.fusengdes.2025.115054

Michael Rott, Claus-Peter Käsemann, Oliver Seibold-Benjak, ASDEX Upgrade Team

{"title":"Replacement and enhancement of power electronics at the flywheel machine EZ2","authors":"Michael Rott, Claus-Peter Käsemann, Oliver Seibold-Benjak, ASDEX Upgrade Team","doi":"10.1016/j.fusengdes.2025.115054","DOIUrl":null,"url":null,"abstract":"<div><div>The flywheel generator “Energiezentrale 2″ (EZ2), consisting of motor, flywheel, generator and auxiliary generator, aged 50 years, supplies ASDEX Upgrades copper Toroidal Field coils with DC current of up to 80 kA. Since there is no redundancy for this machine, a high availability has to be ensured. Therefore, during the 2023/24 experimental brake the inverter was replaced, that supplies the rotor of the 5.7 MVA doubly fed induction drive motor that accelerates the 223 t flywheel of EZ2. For starting the machine, a liquid rheostat is connected to the rotor. This resistor is also used for braking the machine. The inverter of 2 MVA is able to control the speed of the machine in the operating range between 1275 and 1650 rpm.</div><div>In addition, the rectifier has been replaced that supplies the excitation of the high current pulse power synchronous generator. By this excitation the voltage at the stator clamps is controlled that ramps up the DC current in the toroidal field coils of ASDEX Upgrade by the help of diode rectifiers. The main objectives of the excitation controller are a fast rise and a constant DC current to get a useful toroidal field during a plasma pulse. Also auxiliary rectifiers have been replaced, as two 400 A rectifiers heating the slip rings of the synchronous machine in order to reduce high abrasion, a rectifier for compensation of the remanence field of the machine resulting in a high idling current and the excitation inverter feeding the auxiliary generator that supplies DC emergency oil pumps.</div></div>","PeriodicalId":55133,"journal":{"name":"Fusion Engineering and Design","volume":"216 ","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fusion Engineering and Design","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0920379625002522","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/4/12 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

The flywheel generator “Energiezentrale 2″ (EZ2), consisting of motor, flywheel, generator and auxiliary generator, aged 50 years, supplies ASDEX Upgrades copper Toroidal Field coils with DC current of up to 80 kA. Since there is no redundancy for this machine, a high availability has to be ensured. Therefore, during the 2023/24 experimental brake the inverter was replaced, that supplies the rotor of the 5.7 MVA doubly fed induction drive motor that accelerates the 223 t flywheel of EZ2. For starting the machine, a liquid rheostat is connected to the rotor. This resistor is also used for braking the machine. The inverter of 2 MVA is able to control the speed of the machine in the operating range between 1275 and 1650 rpm.

In addition, the rectifier has been replaced that supplies the excitation of the high current pulse power synchronous generator. By this excitation the voltage at the stator clamps is controlled that ramps up the DC current in the toroidal field coils of ASDEX Upgrade by the help of diode rectifiers. The main objectives of the excitation controller are a fast rise and a constant DC current to get a useful toroidal field during a plasma pulse. Also auxiliary rectifiers have been replaced, as two 400 A rectifiers heating the slip rings of the synchronous machine in order to reduce high abrasion, a rectifier for compensation of the remanence field of the machine resulting in a high idling current and the excitation inverter feeding the auxiliary generator that supplies DC emergency oil pumps.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

在飞轮机EZ2更换和增强电力电子

飞轮发电机 "Energiezentrale 2"（EZ2）由电机、飞轮、发电机和辅助发电机组成，已有 50 年历史，为 ASDEX Upgrades 环形磁场铜线圈提供高达 80 kA 的直流电流。由于该设备没有冗余，因此必须确保高可用性。因此，在 2023/24 年实验制动期间，更换了为 5.7 MVA 双馈感应驱动电机转子供电的逆变器，该电机用于加速 EZ2 的 223 吨飞轮。为了启动机器，转子上连接了一个液体变阻器。该电阻器还用于制动机器。此外，还更换了为大电流脉冲功率同步发电机提供励磁的整流器。通过这种励磁，定子夹钳上的电压得到控制，在二极管整流器的帮助下，ASDEX 升级版环形磁场线圈中的直流电流得到提升。励磁控制器的主要目标是在等离子体脉冲期间快速升高并保持恒定的直流电流，以获得有用的环形磁场。此外，还更换了辅助整流器，如两台 400 A 整流器，用于加热同步机的滑环，以减少高磨损；一台整流器，用于补偿因空转电流过大而导致的同步机剩磁场；以及一台励磁逆变器，为辅助发电机供电，以供应直流应急油泵。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Fusion Engineering and Design 工程技术-核科学技术

CiteScore

3.50

自引率

23.50%

发文量

275

审稿时长

3.8 months

期刊介绍： The journal accepts papers about experiments (both plasma and technology), theory, models, methods, and designs in areas relating to technology, engineering, and applied science aspects of magnetic and inertial fusion energy. Specific areas of interest include: MFE and IFE design studies for experiments and reactors; fusion nuclear technologies and materials, including blankets and shields; analysis of reactor plasmas; plasma heating, fuelling, and vacuum systems; drivers, targets, and special technologies for IFE, controls and diagnostics; fuel cycle analysis and tritium reprocessing and handling; operations and remote maintenance of reactors; safety, decommissioning, and waste management; economic and environmental analysis of components and systems.