同步发电机气隙对其稳定性和有功功率影响的研究.pdfVIP

第 43 卷 第 15 期 电力系统保护与控制 Vol.43 No.15 2015 年 8 月 1 日 Power System Protection and Control Aug. 1, 2015 同步发电机气隙对其稳定性和有功功率影响的研究 曹 帅 1 , 张清枝 2 (1.郑州大学电气工程学院，河南 郑州 450001；2.新乡学院机电工程学院，河南 新乡 453003) 摘要：为研究同步发电机的稳定性和有功功率，利用凸极同步发电机的时空矢量图推导出其电枢反应的电动势平 衡方程。在此基础上，通过 DDSZ-1 型凸极同步发电机接入三相对称负载的运行特性的实验结果，分析研究其转 子磁路的结构对运行稳定性的影响，得出如果转子气隙较小则并联运行时发电机的稳定度较差，反之则稳定性较 好的结论。最后利用同步发电机功角时空矢量图，推导出其电磁功率计算公式，并得出转子气隙对有功功率的影 响，即在空间范围内各方向等比例增大转子气隙可以增加电机输出的有功功率。 关键词：时空矢量图；同步电抗；功角；稳定性；有功功率 Research of influence of synchronous generator air-gap on stability and active power CAO Shuai1, ZHANG Qingzhi2 (1. College of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China; 2. College of Mechanical and Electrical Engineering, Xinxiang University, Xinxiang 453003, China) Abstract: To study the stability and active power of the synchronous generator, this paper deduces the electromotive force balance equation of its armature reaction by use of its time space vector diagram. Based on this, through the result of the operation characteristics experiment of DDSZ–1 salient pole synchronous generator connected to the three-phase symmetrical load, it analyzes the influence of its rotor magnetic circuit structure on operation stability, and draws the conclusion that the smaller the rotor air-gap is the poorer its stability of parallel operation, vice versa. Finally, with synchronous generator power angle of time and space vector diagram, its electromagnetic power calculation formula and the influence of the rotor air-gap on active power are deduced, i.e. increasing the rotor air-gap to each space direction proportionally can increase its active power. Key words: time and space vector diagram; synchronous reactance; power angle; stability; active power 中图分类号： TM341 文献标识码：A 文章编号： 1674-3415(2015)15-0091-05 0 引言 同步电机作为交流电机的一种，可以用作发电 机、电动机或调相机。在作为发电机使用时，由于 其具有转速恒定不变、