Generator de-excitation method by utilizing auxiliary inversion pulse generator to participate in de-excitation

A pulse generator and auxiliary inverter technology, applied in the direction of controlling generators, electrical components, emergency protection circuit devices, etc., can solve the problems of difficult selection, high requirements for de-excitation switches, and achieve the effect of reducing the requirements of voltage breaking capacity

Active Publication Date: 2010-05-05
NARI TECH CO LTD +1
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Problems solved by technology

The main problem of this type of de-excitation method is that for large generators, the requirements for the de-excitation switch are too high, and it is difficult to select the type
[0010]Aiming at the problem that large-capacity units have higher requirements for the reliability and safety of the demagnetization system, it is difficult to meet the requ

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  • Generator de-excitation method by utilizing auxiliary inversion pulse generator to participate in de-excitation
  • Generator de-excitation method by utilizing auxiliary inversion pulse generator to participate in de-excitation
  • Generator de-excitation method by utilizing auxiliary inversion pulse generator to participate in de-excitation

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Embodiment Construction

[0025] The generator demagnetization method utilizing an auxiliary inverter pulse generator to participate in demagnetization in this embodiment is based on such figure 2 The excitation circuit with auxiliary inverter pulse generator shown is realized. In the excitation circuit, the auxiliary inverter pulse generator independent of the excitation regulator can simultaneously send out pulses to control the thyristor rectifier bridge, and the excitation The inverter shutdown trigger angle α of the regulator satisfies 120°<α<180°. In this example, α=150°. The inverter shutdown trigger angle β of the auxiliary inverter pulse generator satisfies α≤β<180°. In this example β=160°, de-excitation methods include normal shutdown de-excitation method and emergency shutdown de-excitation method,

[0026] The normal shutdown demagnetization method is as follows:

[0027] The excitation device receives the excitation exit command from the unit monitoring device, and sets the pulse trigger...

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Abstract

The invention relates to a generator de-excitation method by utilizing an auxiliary inversion pulse generator to participate in de-excitation, which is realized on the basis of an excitation circuit with the auxiliary inversion pulse generator and takes an independent auxiliary inversion pulse controller as a core; in normal shutdown, the auxiliary inversion pulse generator is used for stand-by; in accidental shutdown, when an excitation jump switch needs to be protected, especially force excitation by mistake or regulator out of control happens, control pulse of an excitation regulator is cut off, and the auxiliary inversion pulse controller is adopted to achieve the inversion function so as to ensure that the inversion does not rely on whether the regulator is normal or not, and a direct-current side voltage of a silicon controlled rectification bridge can be changed into a negative value, therefore, the requirements to the de-excitation switch is greatly lowered, and the de-excitation reliability is greatly improved.

Description

technical field [0001] The invention relates to a generator rotor demagnetization method, in particular to a generator demagnetization method using an auxiliary inverter pulse generator to participate in the demagnetization, and belongs to the technical field of electric power system excitation control. Background technique [0002] As we all know, the de-excitation function in the generator excitation system is very important for the protection of the generator's internal fault and overvoltage, and to prevent the accident from expanding. In order to minimize the impact of the accident, the demagnetization system is required to transfer the electromagnetic energy of the generator rotor at the fastest speed, so that the terminal voltage of the generator drops to zero quickly. In order to achieve this goal, generator excitation professionals continue to create new technologies to overcome this technical problem. Generator de-excitation is also converted from linear de-excitati...

Claims

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Application Information

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IPC IPC(8): H02P9/12H02H7/06
Inventor 许其品程小勇朱晓东刘国华余振
Owner NARI TECH CO LTD
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