汽轮发电机不对称运行特性分析  

The Characteristics Analysis of Turbo Generator in Asymmetric Operation

作　　者：戈宝军[1] 李鑫[1] GE Bao-jun;LI Xin(School of Electrical and Electronic Engineering,Harbin University of Science and Technology,Harbin 150080,China)

机构地区：[1]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150080

出　　处：《哈尔滨理工大学学报》2018年第4期1-6,共6页Journal of Harbin University of Science and Technology

基　　金：国家重点基础研究发展计划项目(973计划)(2012CB724402)

摘　　要：针对不对称运行产生的负序电流使汽轮发电机损坏的问题,分析计算了汽轮发电机接三相不对称负载稳态运行参数,重点分析了电压电流的变化规律。分析过程依据对称分量法为理论基础,分别采用矩阵方程等效电路方法和有限元法进行计算,建立了汽轮发电机不对称运行组合等效电路模型和发电机有限元仿真模型。有限元仿真三相电压仿真结果与等效电路模型计算结果高度吻合,从而验证了等效模型的正确性。仿真结果可以得出随着负载不对称程度的增加非故障相得电流夹角出现严重偏离,同时不对称运行使电机内磁场发生严重畸变,随着不对称程度的增加气隙磁密谐波幅值增大。Steady-state analysis of generator is aimed at the problem of damage caused by negative sequence current at unbalanced state,and the analysis focuses on the variation of voltage and current.On the basis of symmetrical components method,the analysis used equivalent circuit method and finite element method to build the combined equivalent circuit model and finite element model.The simulation result of three-phase voltage fromfinite element model coincided witli those from equivalent circuit model,and it has proved the validity of tlie model.It is concluded that the more loads asymmetry,the more deviation angle between non-fault-phase current.At the same time,asymmetrical operation causes serious distortion of magnetic field inside the generator,the more loads asymmetry,the more harmonic amplitude of the air-gap flux density.

关 键 词：汽轮发电机 不对称运行 等效电路 有限元模型 

分 类 号：TM311[电气工程—电机]