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Stanford Talks about Sichuan Generator's Oscillation and Out of Step
What is the meaning of generator oscillation and out-of-step? What are the implications? Don't panic, let's take a look at how Stanford Xiaobian analyzes the oscillations and out-of-steps of Sichuan generators for everyone. Please see the following: When the synchronous generator is running normally, the stator magnetic poles and the rotor magnetic poles can be seen as elastic magnetic lines. . When the load increases, the power angle will increase, that is, the magnetic lines will be elongated; when the load decreases, the power angle will decrease, that is, the lines of force will be shortened. When the load changes, due to the inertia of the rotor, the rotor's power angle will not immediately stabilize at the new value, and it will go through many swings around the new stable value. This situation is called synchronous generator oscillation. There are two types of generator rental oscillation in Sichuan: one is that the oscillation amplitude is getting smaller and smaller, the swing of the power angle is gradually attenuated, and after stable at a certain new power angle, it is still running at a synchronous speed and is called synchronous oscillation; The other is that the amplitude of the oscillation is getting larger and larger, and the power angle is continuously increased until it comes out of the stable range, causing the generator to lose synchronization and the generator enters an asynchronous operation, which is called non-synchronous oscillation. Phenomenon when the generator is oscillating or out-of-step a) The stator ammeter indicates an out-of-normal value and reciprocates violently. This is because the angles between the parallel electric potentials have changed and a difference in electromotive force has occurred, causing circulation between the generators. Because of the swing of the rotor speed, the angle between the electromotive force is large and small, and the moment and power are also large and small, thus causing the circulation to be large and small, so the pointer of the stator current swings back and forth. This current plus the original load current may exceed the normal value. b) The stator voltmeter and other bus voltage meter hands indicate lower than normal values ​​and swing back and forth. This is because the angle between the out-of-step generator and other generators is changing, causing voltage swings. Because the current is larger than normal, the voltage drop is also large, causing the voltage to be low. c) The active load and reactive power load fluctuate greatly. Because the generator sends out the power in the process of not oscillating, the power is sometimes small and large, and sometimes the active power is sent out of step, and sometimes the active power is absorbed. The little knowledge about the phenomenon of the generator's oscillation or out-of-step generator is introduced here. I hope this article will give you more knowledge of the generator!