场路耦合法计算同步发电机定子绕组内部故障的暂态过程  

TRANSIENT CALCULATION OF STATORS INTERNAL FAULTS IN SYNCHRONOUS GENERATOR USING FEM COUPLED WITH MULTI-LOOP METHOD

作　　者：孙宇光[1] 王祥珩[1] 桂林[1] 王维俭[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《中国电机工程学报》2004年第1期136-141,共6页Proceedings of the CSEE

摘　　要：用多回路方法虽然已经基本解决了同步电机内部故障的稳态计算问题,但故障后电机铁芯的各处存在着不同程度的饱和,这会影响到计算的准确性。而对内部故障的暂态计算,饱和因素的影响更严重,因为在内部故障的过渡过程中饱和程度也会随时间而变化。该文将电机电磁场的有限元计算与多回路方法相结合,建立了定子内部故障的场路耦合的数学模型,在此基础上对同步发电机三相突然短路和定子绕组的各种内部故障等进行了暂态仿真,考虑了磁极形状、齿槽影响、铁心的饱和和涡流等因素。计算结果与实验波形基本吻合,证明了该数学模型的正确性。By means of the multi-loop method, the steady-state calculation of internal faults in stator windings of synchronous machine has been solved on the whole. However, the calculation accuracy is affected by saturation which is of variable degree in different position of the core. With regard to the transient calculation of internal faults, the effect of satura-tion is more serious since the degree of saturation is changed during the fault. Combining the FEM with the multi-loop method, a mathematical model of the synchronous machine with internal faults is established in this paper, which takes into account the pole geometry, slot effects, saturation and eddy current in the rotor. Based on the mathematical model, the transient behaviors of symmetrical three-phase short circuit at the machine抯 terminal and internal short circuit in the stator are calculated. The simulation results are consistent with the experimental data under the same condition, which verifies the mathematical model of time-step FEM coupled with electric circuit.

关 键 词：同步发电机 定子绕组 故障 暂态过程 场路耦合法 计算 多回路方法 场路耦合法 

分 类 号：TM341[电气工程—电机]