应用等效谐波绕组模型理论和电压变量法分析同步电机两相对中突然短路

The Transient Analysis of the Line to Line Grounded Sudden Short Circuit of Synchronous Machines Using EHWM & MVV

本文应用等效谐波绕组模型理论（ＥＨＷＭ）和电压变量法（ＭＶＶ）在ｄ－ｑ坐标系中对同步电机两相对中点突然短路进行了解析分析，计入了零序电流三次谐波磁势磁通对转子回路的耦合作用。结果表明所用理论方法简单、便捷、精确。通过实例计算发现，空间三次谐波合成磁势磁通在转子阻尼绕组产生很强的电流，其瞬态最大值可达空间基波合成磁势磁通所产生电流的的６０～８０％，稳态最大值甚至明显超过之。因此，零序电流对转子的作用应予以重视和研究。

In this paper the theory of EHWM (Equivalent Harmonic Winding Model) combined with MVV (Method of Voltage Variable) is utilized to analyse the transient processes arose out of the line to line grounded sudden short circuit of the conventional synchronous machines and the superconducting generatiors in the d-q axis coordinates, particularly taking account of the coupling effects of the third harmonic stator space m. m. f. flux created by the stator zero-sequence current to the rotor loops.The results show that the transient maximum current produced by the stator third harmonic m. m. f. flux in the damper is about 60￣80% to that produced by the stator fundamental m. m. f. flux. Thus the zero-sequence current coupling effect to the rotor loops have to be considered in the generator design and I2 capability as well as I capability.