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High precision frequency and aplitude measuring module for electric power and method

A high-precision, power supply technology, applied in the field of electric power automation applications, can solve the problems of large amount of calculation and low precision, and achieve the effect of low cost, high precision and stable performance

Inactive Publication Date: 2006-08-23
JIANGSU WISCOM TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the disadvantages of large amount of calculation and low precision are particularly prominent.

Method used

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  • High precision frequency and aplitude measuring module for electric power and method
  • High precision frequency and aplitude measuring module for electric power and method
  • High precision frequency and aplitude measuring module for electric power and method

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Embodiment Construction

[0036] figure 1 It is a functional block diagram of frequency measurement and amplitude measurement circuit. Each voltage signal is first conditioned by a follower to make the voltage signal more stable. The conditioned sinusoidal voltage is converted to a square wave by a zero-crossing comparator. Square waves and sine waves have the same frequency. This module includes a DSP processor 1, a programmable logic device 2, a comparator 3, a follower 4, an analog-to-digital conversion module 5, and an external crystal oscillator 6; wherein, the output of the DSP processor 1 is connected to the address bus and the control signal line respectively. The input terminal of the programmable logic device 2 is connected to the input terminal of the analog-to-digital conversion module 5 through the sampling control line; the input terminal of the DSP processor 1 is connected to the output terminal of the programmable logic device 2 through the interrupt application A, and connected to th...

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Abstract

This invention relates to an accurate frequency-amplitude testing module for power supply and a method, in which, said module includes a DSP processor, a programmable logic device, a comparator, a follower, an A / D conversion module and an exterior crystal oscillator featured at simple structure, stable performance and high accuracy. The method includes: the programmable logic device enables the DSP processor to enter into an interrupt state by interrupt application at the rising edge and the falling edge of a square wave and the DSP reads the current value in the counter of the programmable logic device at the interruption and deducts the current value of the counter with the last value of the counter to get the frequency of a signal by conversion to be sent into a control register of the A / D conversion module to adjust the sample frequency dynamically to compute the amplitude value of the signals in the primary circulation.

Description

technical field [0001] The invention relates to a method for measuring the frequency and amplitude of a power supply in various power protection devices, substation comprehensive automation devices, and power plant automation devices, and belongs to the technical field of electric power automation applications. Background technique [0002] Most power automation devices need to measure the frequency and amplitude of the power supply. These devices include: various power protection devices, substation comprehensive automation devices, power plant automation devices, etc. The accuracy, range and complexity of frequency measurement and amplitude measurement of power automation devices are different from those of other industries. Common frequency measurement methods mainly use pure software frequency measurement. Typical representatives of this type of algorithm include: Fourier frequency measurement algorithm with error calibration, Fourier frequency measurement algorithm wit...

Claims

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Application Information

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IPC IPC(8): G01R31/42
Inventor 李杰周正超
Owner JIANGSU WISCOM TECHNOLOGY CO LTD