交错磁极混合励磁同步发电机数学模型研究

Research on Mathematical Model of a Consequent-pole Hybrid Excitation Synchronous Generator

交错磁极混合励磁同步发电机的导磁套筒、转子为实心结构,为准确计算发电机暂态性能,必须考虑实心结构的涡流效应。类似于电励磁发电机,该文将导磁套筒、转子的涡流效应集中等效为d轴与q轴阻尼绕组,建立考虑涡流效应的混合励磁发电机数学模型;然后,利用三维有限元法对该发电机频率特性进行分析,揭示该发电机瞬态参数L’d与L"d标幺值较大(分别为0.49与0.32),且L’d与Ld标幺值比较接近(Ld的标幺值为0.53)的特点,并从理论上分析得出,该发电机带整流负载时能够稳定运行;最后,通过试验验证了该发电机数学模型的正确性。

The magnetic sleeve and rotor of the consequent-pole hybrid excitation synchronous generator(HESG) are solid structures. The eddy current effect of the solid structures must be considered in order to accurately calculate the transient performance of the HESG. Similar to the electric excitation generator, in this paper, the eddy current effect of the magnetic sleeve and rotor is equivalent to the d-axis and q-axis damper windings, and the mathematical model of the HESG considering the eddy current effect is established. Then the 3-D finite element method is used to analyze the frequency characteristic of the HESG, which reveals that the unit values of the transient parameters L’dand L"dare large(0.49 and 0.32, respectively), and the unit values of L’dand Ldare close(the unit value of Ldis 0.53). And the theoretical analysis shows that the HESG can operate stably with rectifier load. Finally, the correctness of the mathematical model of the HESG is verified by experiments.