Excitation loss protection admittance characteristic setting method for nuclear power plant generator

Abstract

The invention relates to an excitation loss protection admittance characteristic setting method for a nuclear power plant generator. The method is characterized in that admittance characteristic and low voltage of static stability limit are solved by using a power equation set of a turbine generator, and then the constant value of excitation loss protection of the turbine generator is solved; the method specifically comprises the following steps: 1) solving the terminal measuring admittance YG of the turbine generator; 2) setting terminal low voltage latching excitation loss protection on the turbine generator, and solving the terminal low voltage of the turbine generator; and 3) determining the constant value of excitation loss protection of the turbine generator, wherein when the turbine generator has an excitation loss fault, the terminal low voltage latching excitation loss protection is set for selective protection, namely the low voltage latching value of excitation loss protection is set to be U(los, m), the excitation loss protection is latched when the terminal inter-phase voltage is lower than U(los, m), and the excitation loss protection is opened when the terminal inter-phase voltage is greater than or equal to U(los, m). The method has the characteristic of high calculation precision and good social benefits.

Description

technical field [0001] The invention relates to a method for setting the admittance characteristics of generator loss-of-magnetism protection in a nuclear power plant, which is the loss-of-magnetism protection based on the principle of generator static stability limit admittance. The invention belongs to the technical field of loss-of-excitation protection for generators of nuclear power plants. Background technique [0002] The turbo-generators in nuclear power plants are all synchronous generators, which need to be equipped with loss-of-excitation protection devices. There are two types of the demagnetization protection device: one is based on the principle of the asynchronous boundary impedance circle of the turbogenerator, and the other is based on the principle of the static stability limit impedance circle of the turbogenerator. For large units in modern power systems, especially nuclear power units, their safe and stable operation is crucial to power plants and power...

AI Technical Summary

Problems solved by technology

[0027] The purpose of the present invention is to provide a method for setting the admittance characteristics of the generator demagnetization protection in a nuclear power plant in order to solve the problems of inaccurate calculation results of the existing admittance characteristics, large errors, and instability of nuclear power units and systems.

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