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

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...

AI Technical Summary

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 requirements simply by improving the performance of the DC circuit breaker, and Due to the limitations of the DC circuit breaker's voltage build-up and arc-extinguishing capabilities under large excitation current and high thyristor anode voltage, there is an urgent need to ensure reliable and safe demagnetization technology and methods under large capacity

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