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Power system frequency measuring method and device

A power system and frequency measurement technology, applied in frequency measurement devices, frequency-to-amplitude conversion, etc., can solve the problems of large calculation workload and long calculation time, and achieve the effect of simple principle, easy implementation and accurate measurement

Active Publication Date: 2017-08-18
XUJI GRP +3
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method and device for measuring the frequency of a power system, which is used to solve the problems of large calculation workload and long calculation time when the existing digital filtering method calculates the frequency

Method used

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  • Power system frequency measuring method and device

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Embodiment Construction

[0030] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0031] An embodiment of a power system frequency measurement method of the present invention:

[0032] According to the bus voltage sampling value obtained in the power system, calculate the line voltage at three times with a difference of 1 / P cycle: the line voltage at the current moment, the line voltage before 1 / P cycle, and the line voltage before 2 / P cycle:

[0033]

[0034]

[0035]

[0036] Among them, n is the sampling sequence, and N is the number of sampling points of a cycle at a frequency of 50 Hz, with represent different phases, with respectively together The fundamental wave phasor of the line voltage at the current moment of the phase, with respectively together The fundamental phasor of the 1 / P cycle front-line voltage of the phase, with respectively together The fundamental phasor of the ...

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Abstract

The invention relates to a power system frequency measuring method and a device. The method comprises the steps of calculating the line voltages at three moments with an interval of 1 / P cyclic wave according to a sampling value of bus voltage acquired from a power system, and calculating the current frequency of the system according to the real and imaginary parts of the line voltages at the three moments. The measuring method is based on a simple principle, and is easy to implement. Through the method, the frequency of a power system can be measured accurately without being influenced by the zero crossing point and harmonic wave.

Description

technical field [0001] The invention belongs to the technical field of power system relay protection and control measurement, and in particular relates to a power system frequency measurement method and device. Background technique [0002] Frequency is one of the important electrical parameters of the power system, and the research on the frequency measurement algorithm of the power system is of great significance both in theory and in practice. When the power system is running normally, the frequency is an important index to measure the power quality. When the power system fails, the frequency is an important basis for judging the system failure. [0003] At present, the equipment in the power system is designed and manufactured according to the rated frequency, and the best performance can only be achieved when it operates near the rated frequency. Excessive changes in system frequency will have adverse effects on the operation of users and power plants. As the load and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/06
CPCG01R23/06
Inventor 龚赟王智勇陈继瑞肖锋黄继东胡沙沙冯广杰王莉姚东晓许圣龙刘浩磊孟利平
Owner XUJI GRP
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