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
CN107064630AActive Publication Date: 2017-08-18XUJI GRP +3
7 Cites 9 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XUJI GRP
Publication Date
2017-08-18

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More