抽水蓄能电机阻尼绕组对电磁场和转子温度场的影响研究

发布时间：2019-03-22 10:56

【摘要】：利用抽水蓄能电站对电力系统进行调峰填谷,是提高电力系统经济性、可靠性的有效手段。抽水蓄能电机是抽水蓄能电站的重要部分,而阻尼绕组作为该种电机的重要组成部件,不仅可以抑制磁场突变和转子振荡,同时在抽水蓄能电机电动工况下异步起动时提供起动力矩,其形状和分布会影响电机的电磁性能和转子各部件温升,为此,研究阻尼绕组对电机电磁参数和温度分布的影响具有重要意义。本文综合抽水蓄能电机实际结构尺寸、额定工作参数和电磁场理论,建立二维有限元电机数学模型,对电机内电磁场进行求解,计算得到电机的电抗参数和阻尼绕组涡流损耗,利用解析公式计算转子内附加损耗,找出磁极表面和阻尼绕组的损耗分布规律。然后将有阻尼绕组电机与无阻尼绕组电机进行比较,讨论电机加入阻尼绕组后对转子内损耗分布和电抗参数的影响,并研究阻尼绕组在不对称运行工况下的涡流损耗变化,详细讨论分析阻尼条节距和直径变化的相关影响,得到的结论可作为抽水蓄能电机阻尼绕组设计参考依据。最后,建立电机转子三维流体场和温度场的耦合计算模型,计算分析发电和电动两种工况额定负载下电机转子范围内的流体和各结构件温度分布规律,并与实测值比较,验证计算有效性。在此基础上,研究了阻尼绕组断条故障对电抗参数、转子内损耗分布和温度分布的影响。
[Abstract]:It is an effective means to improve the economy and reliability of the power system by using pumped storage power station to adjust the peak and fill the valley of the power system. Pumped storage motor is an important part of pumped storage power station, and damping winding, as an important component of this kind of motor, can not only restrain the sudden change of magnetic field and rotor oscillation. At the same time, when the motor starts asynchronously under the electric condition of pumped storage motor, the shape and distribution of the torque will affect the electromagnetic performance of the motor and the temperature rise of the components of the rotor. It is of great significance to study the influence of damping windings on the electromagnetic parameters and temperature distribution of the motor. In this paper, according to the actual structure size, rated working parameters and electromagnetic field theory of pumped storage motor, the mathematical model of two-dimensional finite element motor is established. The electromagnetic field in motor is solved, and the reactance parameters and eddy current loss of damped winding are calculated. An analytical formula is used to calculate the additional loss in the rotor, and the loss distribution law of the magnetic pole surface and damping winding is found out. Then, the damping winding motor is compared with the undamped winding motor, and the influence of the damping winding on the loss distribution and reactance parameters of the rotor is discussed, and the eddy current loss change of the damped winding under the asymmetrical operation condition is studied. The influence of damping bar pitch and diameter variation is discussed in detail. The conclusion can be used as a reference for damping winding design of pumped storage motor. Finally, the coupling calculation model of three-dimensional fluid field and temperature field of motor rotor is established, and the temperature distribution law of fluid and structure in the range of motor rotor under the rated load of power generation and electric power is calculated and analyzed, and compared with the measured value. Verify the validity of the calculation. On the basis of this, the influence of damped winding broken bar fault on reactance parameters, loss distribution and temperature distribution in rotor is studied.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV743;TV734

【参考文献】