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Development of a Permanent-Magnet Induction Generator for Wind Power and Small-Scale Hydropower Applications

开发用于风力发电和小型水力发电的永磁感应发电机

基本信息

批准号：
16560259
负责人：
FUKAMI Tadashi
金额：
$ 2.11万
依托单位：
Kanazawa Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560259/
关键词：
Wind power Small-scale hydropower Induction generator PM excitation Modeling Magnetic field analysis

项目摘要

Recently, wind power and small-scale hydropower plants have been extensively introduced as renewable energy sources that contribute to environmental protection. In such power plants, induction generators (IGs) are widely used because they can be directly connected to a power grid and do not require much additional equipment while being advantageous in terms of cost and maintenance. However, the IGs require a magnetizing current from the power grid, which essentially causes a decrease in power factor and efficiency. Therefore, the performance of the IGs needs further improvement.In this research project, a new type of IG termed the Permanent-Magnet Induction Generator (PMIG) was developed, and its electric and magnetic characteristics were analyzed. The PMIG has a permanent-magnet (PM) rotor inside a squirrel-cage rotor. The squin-el-cage rotor is linked to the shaft, and the PM rotor is free to rotate against the shaft.As a result of the analysis, the following new findings were obtained :1.The desired operation as an IG is not obtained when a damper function is added to the PM rotor.2.Even if the PMIG operates at unbalanced voltages or single-phase power grids, its efficiency is better than that of a conventional IG3.Since the negative-sequence rotating field, which is produced under unbalanced modes of operation, is almost canceled by the squirrel-cage rotor, there is no risk of PM's demagnetization.

近年来，风力发电和小型水力发电厂作为有助于环境保护的可再生能源得到广泛采用。在这样的发电厂中，感应发电机（IG）被广泛使用，因为它们可以直接连接到电网并且不需要太多的附加设备，同时在成本和维护方面是有利的。然而，IG需要来自电网的磁化电流，这本质上导致功率因数和效率的降低。本研究针对永磁感应发电机（PMIG）的特点，设计了一种新型的永磁感应发电IG，并对其电磁特性进行了分析。PMIG在鼠笼式转子内有一个永磁体（PM）转子。分析结果表明：1.在永磁转子上加阻尼器后，永磁发电机不能实现理想的IG运行; 2.即使在不平衡电压或单相电网下运行，其效率也优于常规IG; 3.由于不平衡运行模式下产生的负序旋转磁场几乎被鼠笼转子抵消，因此不存在永磁退磁的风险。