系统谐波与负序电流对水轮发电机的影响

The effect of the harmonics and negative sequence on hydro-generator

随着电力系统中电力电子装置以及不平衡负载大量增加 ,谐波和负序污染日趋严重 ,它们对发电机的运行安全带来危害 .采用多回路法建立的凸极同步电机d ,q系统模型 ,导出了在外加任意谐波或负序时定转子电流、电磁转矩以及阻尼条电流分布的稳态计算方法 .通过实例计算 ,分析和说明了电力系统谐波和负序对大型水轮发电机的影响 .

With the substantial growth of power electronic devices and unbalanced loads in power systems, the outcoming harmonics and negative sequence endanger the running safety of the generators seriously. The calculation method for stator and rotor currents, electromagnetic torque, damper current distribution caused by harmonics and negative sequence is presented based on multi loop equations in d,q,0 coordinate. The practical examples are given to analyze and illustrate the effect of the harmonics and negative sequence on large hydro generators.