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双绕组电抗分流自励恒压发电机的励磁系统具有简单可靠和单机运行对负荷变化反应速度快等优点,但在并网运行时,常发生并列瞬间电流激增(有时电流超出发电机额定电流),使发电机并网发生困难。如乳山县花家疃水库电站的125kW自励恒压发电机和白沙口潮汐发电站160kW两台自励恒压发电机并车时就出现了以下两种情况:(1)在并列后瞬间三相定子电流上升,励磁电流下降,功率因数超前,发电机向系统吸收无功;(2)在并列后瞬间三相定子电
The excitation system of double-winding reactance shunt self-excitation constant voltage generator has the advantages of simple and reliable and single machine operation to react quickly to load changes. However, parallel operation of instantaneous current surge (sometimes exceeding the generator rated current) , Making it difficult for generators to be connected to the grid. For example, the 125kW self-excited constant voltage generator at Rushan Huacijiao Reservoir Power Station and the 160kW Baishakou tidal power station at the time of merging with two self-excited constant voltage generators have the following two situations: (1) Phase stator current increases, the excitation current decreases, the power factor ahead of the generator to absorb reactive power system; (2) in the parallel moment after the three-phase stator power