双绕组交直流发电机直流侧突然短路分析

根据3／12相双绕组发电机的基本磁链方程和电压方程以及等效电路，该文建立了双绕组发电机交流侧带负载时直流侧突然短路的基本电压方程；通过进行适当的近似，用解析的方法分析了突然短路的过渡过程，给出了定转子时间常数的简明表达式和整流绕组交流侧的短路电流表达式以及直流侧最大短路电流的近似计算公式。在此基础上，研究了交流负载对直流侧短路电流的影响并给出了相应的物理解释。模拟试验结果表明：交流侧负载的大小对直流侧短路电流有较大的影响，而功率因数对直流侧短路电流的影响很小，验证了理论分析的准确性。

ANALYSIS OF SUDDEN DC-SIDE SHORT CIRCUIT OF DOUBLE-WINDING AC-DC GENERATORS

According to the basic flux-linkage equations, voltage equations and equivalent circuits of 3-&12-phase double-winding AC-DC generators, the basic voltage equations are presented for the sudden DC-side short circuit of 3- &12-phase double-winding AC-DC generators with the 3-phase AC-winding loaded. With some appropriate approximations, the transient process of the sudden DC-side short circuit is analyzed by making an analytical approach, and the concise time constant expressions of the stator and rotor windings and complete expressions of the AC-side short-circuit currents of the 12-phase DC winding as well as the approximate expression of DC-side maximum short-circuit current are derived. Furthermore, the effect of AC-side load on the sudden DC-side short-circuit current is analyzed, and its physical interpretation is also presented. The results show that the value of AC-side load current has considerable effect on the DC-side short-circuit current, but the power factor has little effect. The calculated and measured results agree quite well, showing the validity of the analytical analysis developed.