十二相混合励磁发电机低速工况下稳态短路电流计算与试验研究

Research of Calculation and Test of Steady State Short Circuit Current for Twelve-phase Hybrid Excitation Generator at Low Speed

针对十二相四Y移15°混合励磁发电机,给出了低速、不同Y绕组三相短路情况下的稳态短路电流表达式,采用三维有限元法对稳态短路电流进行了仿真计算,并在样机上进行了试验验证。研究结果表明:在低速情况下,定子电阻对稳态短路电流具有决定性影响,不同Y绕组三相稳态短路电流均可近似表达为每相空载反电动势有效值与定子电阻之比;稳态短路电流的理论计算值、仿真值与实测值符合的较好,证明了低速稳态短路电流计算方法的正确性。

For the twelve-phase hybrid excitation generator which have four-Y windings with 15 degrees, the expression of steady state short circuit current was given at low speed and under the conditions of three phase short-circuit between different Y-windings. The steady state short circuit current was simulated by 3D finite element method and was verified by test on the prototype. The research results shows that： stator resistance has a decisive influence for the steady state short circuit current at low speed, the three phase steady state short circuit current between different Y-windings can be approximated the ratio of RMS per phase no-load back electromotive force and the stator resistance ; the analytical results of the steady state short circuit are in agreement with simulated and measured values, the correctness of analytical calculation method for the stead- y state short circuit current at low speed is validated.