汽轮发电机双因素非线性特性的研究  

Study of Two Factors Affecting Nonlinear Characteristic of Turbogenerator

作　　者：罗应立 蒙亮 刘晓芳 赵凌志[2] 

机构地区：[1]华北电力大学电力系统保护与动态安全监控教育部重点实验室,北京102206 [2]中国科学院电工研究所,北京100080

出　　处：《电工技术学报》2005年第6期1-5,15,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(50277011)

摘　　要：通过理论分析和有限元计算相结合的方法,以一台300MW汽轮发电机为例,对其在正常和非正常运行状态下的非线性特性曲线族和磁场分布进行了系统研究和分析,提出主要是由于铁心饱和与磁场畸变两个因素的影响,导致了汽轮发电机复杂的非线性特性。在功角相同的情况下,由于励磁电流大小不同导致的转子漏磁场的差异,影响了转子铁心的饱和,使产生相同的气隙电势Eδ时就需要不同的合成电流I∑;而在功角较大状态下发生的磁场畸变则增长了主磁路经过气隙的部分,同样会影响合成电流产生气隙电势的大小。The nonlinear characteristic curve series and the magnetic field distribution of a 300 MW turbogenerator under normal or abnormal operation condition are studied systemically by mean of FEM method. Two factors of iron saturation and magnetic field distortion affecting such nonlinear characteristics are presented in this paper. When power angle is fixed, different exciting currents will lead to the difference of rotor leakage field and thus have effect on the rotor iron saturation, so the value of resultant current I summation corresponding to a given Eδ, will vary with the change of saturation status. And besides, under a large power angle condition, the magnetic field distortion will enlarge air-gap part of the main magnetic path and influence the value of the air-gap voltage ES.

关 键 词：汽轮发电机 铁心饱和 磁场畸变 非线性特性 

分 类 号：TM311[电气工程—电机]