高速交错磁极混合励磁发电机直流侧短路电流分析计算

Analysis and Calculation of DC Side Short-Circuit Current of High-Speed Staggered Pole Hybrid Excitation Generator

为提高高速交错磁极混合励磁同步发电机直流侧短路电流的计算精度,通过在dq轴上设立阻尼回路的方法,建立电机动态数学模型。该模型能够同时考虑定子导磁套筒、实心转轴、永磁体和铁心极在短路过程中涡流效应对电枢绕组电流的影响,在此基础上推导出电机瞬态、超瞬态电感以及短路电流的表达式。通过与某型高速交错磁极混合励磁电机短路电流试验结果进行对比,验证了模型的有效性,并对存在误差的原因进行分析,指出该类电机在短路过程中由于交错磁极结构导致的动态饱和现象是造成误差的主要原因之一。

In order to improve the calculation accuracy of the short-circuit current on the DC side of the high-speed staggered pole hybrid excitation synchronous generator(HESG), a dynamic mathematical model of the generator was established by setting up damped winding loops on dq-axis respectively, which could take into account the eddy current effect of stator magnetic sleeve, solid shaft, permanent magnet and iron core pole at the same time. Based on this, the expressions of transient, subtransient inductance and short-circuit current were derived. By comparing with the short-circuit current test results of a high-speed staggered pole HESG, the validity of the model was verified, and the causes of the error were analyzed. It is pointed out that the dynamic saturation phenomenon caused by the staggered-pole structure during the short-circuit process of the generator is one of the main reasons of the error.