Method and device for matching and setting low-excitation limitation and field loss protection of salient-pole machine

Abstract

The invention provides a method and a device for matching and setting low-excitation limitation and field loss protection of a salient-pole machine, which are used for guaranteeing reasonable matching of the low-excitation limitation and field loss protection of the salient-pole machine. The method comprises the following steps: converting a low-excitation limitation curve to an impedance plane from a power plane, comparing the low-excitation limitation curve converted to the power plane with a static voltage stability limitation curve of the salient-pole machine in an R-axis positive semi-axis area; when the low-excitation limitation curve of the R-axis positive semi-axis area does not include the static voltage stability limitation, re-setting the low-excitation limitation curve. According to the technical scheme adopted by the invention, the reasonable matching between the low-excitation limitation and field loss protection of the salient-pole machine is guaranteed, technical basis is provided for power dispatching production management in a facilitated manner, the control and protection functions of the motor are brought into full play, the network source coordination level is improved, the safe and efficient operation of the energy resources are realized, and the power is guaranteed to safely and economically feed out.

Description

technical field [0001] The invention relates to the technical field of generators, in particular to a method and device for coordinating setting of low-excitation limitation and loss-of-excitation protection of a salient-pole machine. Background technique [0002] Motor loss of excitation refers to the sudden partial or complete loss of excitation of the generator, which is a common fault in the excitation circuit of the generator. Especially for large-scale generator sets, the excitation system has many links and complex structure, which increases the probability of loss-of-excitation faults. Statistics show that loss-of-excitation faults account for more than 60% of the total generator faults. After the generator is demagnetized, it will transition to asynchronous operation, the rotor will slip, the stator current will increase, the stator voltage will decrease, the active power will decrease, and the reactive power will reverse and increase; the differential frequency cur...

AI Technical Summary

Problems solved by technology

[0011] It can be seen that although the existing literature has discussed the cooperation between low-excitation limitation and loss-of-excitation protection, it generally only analyzes specific experiments and lacks a general method. The relation of low excitation limit does not take into account the particularity that the static stability limit curve of a salient pole machine is a drop-shaped curve

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