本科毕业设计同步发电机失磁异步运行的机电暂态仿真.pdf

同步发电机失磁异步运行的机电暂态仿真 同步发电机失磁异步运行的机电暂态仿真 摘要 同步发电机的失磁异步运行是指同步发电机失去励磁后，仍带有一定的有功 功率，以低滑差与电网继续并列运行的一种特殊运行方式。在该运行方式下，发 电机从电网吸收大量的电感性无功功率，定子电流增大，定子电压下降，有功功 率减少。从提高供电可靠性和不致即刻致使电网发生大的有功功率缺额的观点 看，失磁后的汽轮发电机最好不立即从系统解列而维持一段时间在电网上运行， 使我们有可能寻找失去励磁的原因并恢复励磁。因此，失磁异步运行作为一种过 渡的运行方式有很大的实际意义。文章分析了同步发电机失磁运行的原因及现 象，解释了失磁异步运行的必要，从失磁后发电机各参数的变化了解了失磁异步 运行与同步运行的区别，运用数学模型和数值仿真分析了同步发电机失磁异步运 行的物理过程。 关键词：同步发电机；失磁运行；机电暂态过程；数学分析；数值仿真 同步发电机失磁异步运行的机电暂态仿真 THE ELECTROMECHANICAL TRANSIENT SIMULATION UNDER SYNCHRONOUS GENERATOR’S EXCITATION-LOSS ASYNCHRONOUS OPERATION ABSTRACT Synchronous generator field loss asynchronous operation after loss refers to the synchronous generator excitation, still have certain active power, with a low slip juxtaposed with grid continues to run a special operation mode.Under the operation mode, the generator from the grid to absorb a large number of inductive reactive power, the stator current, the stator voltage drop, active power reduction.From the reliability of power supply and not immediately in case of large active power deficiency point of view, the steam turbine generator after magnetic loss should not immediately from the system to maintain a period of time on the grid operation, we could find the cause of the loss of excitation and restore excitation.Therefore, excitation-loss asynchronous operation as a transitional operation mode has great practical significance.The article analyses the reasons of the synchronous generator field loss operation and phenomenon, explains the necessary of the excitation-loss asynchronous operation, from the changes of the generators of each parameter of the excitation-loss understand the excitation-loss run