Abstract–

Because of the absence of theoretical method for harmonic electromagnetic torque calculation, based on the relationship between the electromagnetic torque and the electromagnetic power, a new lumped magnetic parameter method (NLMPM) for harmonic electromagnetic torque calculation is introduced in this paper. Then based on the NLMPM, the effect of damper winding on harmonic component of the electromagnetic torque is investigated, including the existence of damper winding and the material alteration of damper winding. After that, to test the effectiveness of the theoretical analysis, the finite element models of a 1400MVA and a 30kVA turbo-generator are built up. Also, the experimental data proves the correctness of finite element models. The results achieved by the NLMPM and the finite element method (FEM) have a very good agreement. The concrete error between the NLMPM and the FEM at small current asymmetrical degree and big current asymmetrical degree is given respectively. The effect of damper winding on harmonic component of the electromagnetic torque is studied from a totally new perspective, as well. The theoretical method introduced in this paper can accurately help detect the harmonic electromagnetic torque vibration according to the lumped magnetic parameters.

摘要-

由于缺乏谐波电磁转矩计算的理论方法，本文基于电磁转矩与电磁功率的关系，提出了一种新的谐波电磁转矩计算集总磁参数法(NLMPM)。然后基于NLMPM，研究了阻尼绕组对电磁转矩谐波分量的影响，包括阻尼绕组的存在和阻尼绕组的材料变化。之后，为检验理论分析的有效性，分别建立了1400MVA和30kVA汽轮发电机的有限元模型。实验数据也证明了有限元模型的正确性。NLMPM 和有限元法 (FEM) 获得的结果具有很好的一致性。分别给出了小电流不对称度和大电流不对称度下NLMPM与FEM的具体误差。阻尼绕组对电磁转矩谐波分量的影响也从全新的角度进行了研究。本文介绍的理论方法可以根据集总磁参数准确帮助检测谐波电磁转矩振动。