隐极发电机阻尼绕组和槽楔对励磁转矩的影响

Influence of damping winding and slot wedge on excitation torque of hidden pole generator

为了说明在外部稳态不对称情况下,阻尼绕组和阻尼槽楔对同步隐极发电机励磁绕组恒定电磁转矩和二次谐波电磁转矩的影响。首先,在同步隐极发电机正序等效电路和负序等效电路以及正序磁场恒定电磁转矩和负序磁场恒定电磁转矩分析的基础上,推导出一种新型研究同步隐极发电机恒定电磁转矩的解析方法。然后,在磁场相互作用分析的基础上,提出一种分析同步隐极发电机励磁绕组二次谐波电磁转矩的新方法,并用该方法分析了电流不对称度、阻尼绕组和阻尼槽楔对同步隐极发电机励磁绕组二次谐波电磁转矩幅值的影响。最后,为了验证解析分析的正确性,采用时步有限元法进行仿真计算,有限元数值算法的结果与解析分析结果具有良好的一致性。

Effect of damper winding and wedge winding on the constant and the second harmonic field winding electromagnetic torque of non-salient pole synchronous generator under external asymmetry were illustrated.At the beginning,based on analysis of the positive sequence equivalent circuit,the negative sequence equivalent circuit of non-salient pole synchronous generator,the constant electromagnetic torque in the positive sequence magnetic field and the constant electromagnetic torque in the negative sequence magnetic field,a novel analytical method was deduced to investigate the constant electromagnetic torque of non-salient pole synchronous generator.Then based on interaction of magnetic fields,a new approach was proposed to research on the second harmonic field winding electromagnetic torque of non-salient pole synchronous generator.Besides,adopting this method,influence of the asymmetrical degree,damper winding and wedge winding on the second harmonic field winding electromagnetic torque amplitude was analyzed.In the end,time-step finite element method was utilized to do the simulation calculations.The results of the finite element method have good agreement with those of the proposed analytic method.