Method and device for setting low-excitation limitation parameter

Abstract

The invention provides a method and a device for setting a low-excitation limitation parameter. The method comprises steps: a first characteristic curve for an equivalent transfer function of a generator system along with frequency changes in a set frequency range is acquired through a frequency scanning mode; under a low-excitation limitation parameter of the generator system, a second characteristic curve for a set transfer function of the generator system along with frequency changes in the set frequency range is acquired; the first characteristic curve and the second characteristic curve are used for calculating and acquiring a Nyquist curve for the generator system; and by using the Nyquist curve, the low-excitation limitation parameter is set according to a Nyquist stability criterion. The method and the device can be well applied to field low-excitation limitation parameter setting through the frequency scanning mode, and the stability of the generator system is not broken.

Description

technical field [0001] The invention relates to the technical field of generators, in particular to a method and device for setting low excitation limiting parameters. Background technique [0002] With the development of the generator excitation system, its auxiliary limiting link is continuously optimized, and the low excitation limit (UEL) is one of the more important limiting links, which is widely used in major power plants. The most common problem in the application of low excitation limit is that the action of low excitation limit destroys the stability of the generator system due to the unreasonable setting of various parameters of low excitation limit. At present, the method of setting low excitation limit parameters in power plants is mostly to use the default parameters, deepen the phase advance depth of reactive power under several operating conditions, trigger the low excitation limit action, and observe the stability of the system after the action. This method...

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Problems solved by technology

[0004] The method using this technology cannot guarantee that the low excitation limit can operate normally under various working conditions

Once the oscillation occurs, the unreasonable parameter variables of the low excitation limit cannot be quickly analyzed, and multiple experiments are required to find the unreasonable parameters, and there are also great difficulties in parameter correction.

Moreover, there are certain risks in the test in the actual power grid, and the phase advance cannot be too deep or the system damping can be weakened, otherwise it may cause oscillation of the power grid connected to the generator set

Therefore, this detection method has some limitations

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