记笔记

Improvement of the De-excitation Methods for Large-Capacity Synchronous Generator

Qin-yue TAN¹Lin JIANG²Shao-rong WANG³J.W.SPENCER²Xiao-qing WU¹Chao HE¹

1. Department of Power and Electrical Engineering, College of Water Resources and Architectural Engineering, Northwest A&F University 2. Department of Electrical Engineering and Electronics, University of Liverpool 3. School of Electrical and Electronics Engineering, Huazhong University of Science and Technology

摘要：With the increase of single-machine capacity of synchronous generator, the excitation current for electromagnetic induction increases greatly. How to ensure fast, secure, flexible and effective de-excitation in the event of no-load mistaken over excitation, system faults and other extreme conditions has become a problem in urgent need of researches and solutions. In this paper, the mainstream excitation schemes for static self-parallel excitation-enabled hydroelectric generator units and brushless excitation for nuclear power generator units are analyzed. The main reasons of de-excitation accident of large capacity generator are studied, the key parameters of electromagnetic boundary conditions and de-excitation characteristics are analyzed, the topology of the de-excitation circuit is optimized, and the choice of de-excitation resistor is studied in depth. This paper will combine the Three Gorges hydropower 700 MW self-excitation unit to carry out research work to improve the de-excitation characteristics of large-capacity synchronous generator.

关键词：

Large-capacity synchronous generator; Flexible de-excitation; Soft-switching technology; Non-linear resistor;

基金：

financially supported by the National Natural Science Foundation （51577157）； supported by “the Fundamental Research Funds for the Central Universities” （2452015053）；

会议名称：

2017 2nd International Conference on Energy, Power and Electrical Engineering（EPEE 2017）

会议时间：

2017-11-26

会议地点：

中国上海