基于实测数据对发电机等值电势与励磁电流变化关系的分析  

Analysis of generator relationship between equivalent potential and excitation current based on measurement data on steady state operation

作　　者：段俊东[1] 邓亚鹏 张滨 段志远 DUAN Jundong;DENG Yapeng;ZHANG Bin;DUAN Zhiyuan(School of Electrical Engineering and Automation,Henan Polytechnic University, Jiaozuo 454000,China)

机构地区：[1]河南理工大学电气工程与自动化学院

出　　处：《武汉大学学报（工学版）》2019年第10期898-904,共7页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目（编号：61104119）

摘　　要：采用戴维南等效电路分析等值电势、端电压、定子电流及电抗之间的变化关系,在电抗一定的条件下,可通过端电压、定子电流及电抗确定等值电势的大小,并与励磁电流建立关系,以进行发电机励磁电流调节对发电机端电压的影响的研究.采用2种模型研究等值电势与励磁电流之间的关系,一种采用空载电压与励磁电流之间的变化关系,另一种采用空载电压与励磁电流在未饱和段的线性关系,并用稳态数据进行校验.结果表明,采用空载电压与励磁电流在未饱和段的线性关系表示等值电势与励磁电流之间的关系更符合实验结果.In this paper,the relation between equivalent potential, terminal voltage, stator current and reactance are analyzed by using the Thevenin equivalent circuit;when reactance is constant, equivalent potential can be calculated with the terminal voltage, stator current and reactance. Also, the quivalent potential and excitation current can be built in the same window, which can be used to study the generator terminal voltage regulation with automatic excitation current adjustment. The two models are founded to analyze the relation of equivalent potential and excitation current: one is adopted to estimate by using the no-load voltage and excitation current;the other is adopted by the data terminal voltage and excitation current at unsaturated section. The mathematical relationships are testified by the data under steady state operation of generator. The results show that the relationship of equivalent potential and excitation current built by the second model is more accurate.

关 键 词：同步发电机 空载特性 励磁电流 戴维南等效电路 

分 类 号：TM3[电气工程—电机]