摘要
同步电机V形曲线能表明同步电机在大电网上运行时如何合理地调节电机的无功功率输出,是同步电机的重要运行特性曲线。已有文献的理论分析和推导大都限于隐极同步电机,对凸极同步电机V形曲线的理论分析推导较少。对凸极同步电机应用其功角方程和稳定条件,通过求解关于sin2θ和sinθ的3次方程的方法,分别就凸极同步电机稳定极限、功率因数、功率角的计算进行分析,得到了凸极同步电机V形曲线的解析表达式以及同步电机在cos为定值时IM关于If的解析公式。利用计算机的高速运算能力可以迅速获得V形曲线。该方法可以推广到隐极同步电机。
V-curve is an important running curve of salient-pole synchronous electric machine for it implies how to adjust reactive power when the machine is connected to an electric power grid. However, theoretical analyses in existing literatures are almost all focusing on non-salient pole synchronous machine, seldom on salient-pole synchronous electric machine. Combining the load angle equation and stability condition, the calculation of stability limit, power factor and power angle of salient-pole synchronous electric machine was discussed by solving cubic equation about sinθ and sinθ. An analytic expression of V-curve for salient-pole synchronous electric machine has been obtained and the analytic formula of IM about If for salient-pole synchronous electric machine is obtained when cosφ is constant. With the help of high efficient computer, we can get the V-curve quickly, and this method can also be applied to analyze non-salient pole synchronous machine.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2008年第18期110-113,共4页
Proceedings of the CSEE
关键词
凸极同步电机
V形曲线
解析计算
稳定极限
功率角
salient-pole V-curve
analytic computation
synchronous electric machine
stability limit
power angle
