功角作正弦大振荡时同步电机的整步转矩和阻尼转矩系数

Synchronizing and Damping Torque Coefficients of Synchronous Machines under Large Sinusoidal Oscillation

本文在sin(△_msinδ)的级数展开的基础上,导出了功角作正弦大振荡时,同步电机的动态电磁转矩、整步转矩系数和阻尼转矩系数的解析表达式;并以一台3200kW的低速同步电动机为例,算出了它在大振荡情况下的动态功角特性.最后给出了一组用计算机算出的、在常用的参数范围内,整步转矩和阻尼转矩系数随振荡频率、参数、工作点和振荡幅值的不同而变化的曲线,供设计、研究和实际运行使用.

In this paper, the formulas of synchronizing and damping torque coefficients (? and ?) of synchronous machines under large sinusoidal oscillation are derived using the series expansion of sin(△_msinδ). As an example, the dynamic torque angle characteristics and ?? of a 3200kW synchronous motor are calcullated and analized. Finally, curves of ? and ? with x_d=0.8-1.4 and frequency of oscillation λ=0.02 and 0.04 are given for engineering use.