超高压发电机失磁异步运行磁场分析 - 中国电机工程学报.pdfVIP

第32 卷 第6 期 中 国 电 机 工 程 学 报 Vol.32 No.6 Feb.25, 2012 170 2012 年2 月25 日 Proceedings of the CSEE ©2012 Chin.Soc.for Elec.Eng. 文章编号：0258-8013 (2012) 06-0170-06 中图分类号：TM 312 文献标志码：A 学科分类号：470·40 超高压发电机失磁异步运行磁场分析 吕艳玲，戈宝军，陶大军，张志强，林鹏 (哈尔滨理工大学电气与电子工程学院，黑龙江省 哈尔滨市 150040) Analysis on Magnetic Field of Extra High Voltage Generators Asynchronously Operated Under Loss-of-Field Condition LÜ Yanling, GE Baojun, TAO Dajun, ZHANG Zhiqiang, LIN Peng (College of Electrical Electronic Engineering, Harbin University of Science and Technology, Harbin 150040, Heilongjiang Province, China) ABSTRACT: There was a huge impact on the grid stability 行和失磁异步运行的瞬态磁场进行对比分析，得出了同步运 and safe operation of generators when loss of field fault was 行和稳态异步运行时气隙磁密基波幅值基本一致，而失磁异 occurred on a generator. In this country, the effect of EHVG 步运行时气隙磁密谐波幅值较大；且随着 EHVG 失磁，稳 loss of field on the power grid was still in the research stage. 态异步运行前所带负荷的减少进入稳态异步运行时，气隙磁 For accurate simulating the magnetic field distribution of the 密谐波分量也逐渐减小，气隙合成磁密接近正弦波，为其运 EHVG loss of field, the time-stepping finite element model of 行提供基础数据。 the EHVG was built considering the couple of field, circuit and 关键词：超高压发电机；失磁；场路耦合；失磁异步运行； rotational movement. Simulations and tests showed that the 磁密谐波 model and the method are effective. By comparison of the transient field distributions under the synchronous operation 0 引言 with the steady-state asynchronous operation in cas