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Method and device for electric generator frequency measurement based on PLC high-speed input

A technology of frequency measurement and generator, which is applied in the field of power system, can solve the problems of increasing system cost, etc., and achieve the effect of simple structure, reduced hardware configuration, and low cost

Active Publication Date: 2014-06-18
HNAC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires additional configuration of interrupt input ports or interrupt modules, which increases the cost of the system

Method used

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  • Method and device for electric generator frequency measurement based on PLC high-speed input
  • Method and device for electric generator frequency measurement based on PLC high-speed input
  • Method and device for electric generator frequency measurement based on PLC high-speed input

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] like figure 1 As shown, a generator frequency measuring device based on PLC high-speed input includes a frequency shaping circuit, a frequency division circuit, a high-frequency pulse counting circuit, and a PLC, and the frequency shaping circuit, a frequency dividing circuit, a high-frequency pulse counting circuit, and a PLC In sequence, the AC sine wave signal is shaped into a square wave signal by the frequency shaping circuit. The square wave signal is divided by the frequency division circuit and then input to the high frequency pulse counting circuit. The high frequency pulse counting circuit outputs the high frequency pulse train and sends it to the PLC. , PLC counts the input high-frequency pulse train.

[0022] like figure 2 , Figure 4 As shown, the frequency division circuit includes a D flip-flop U1 and a resistor R1. After the g...

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Abstract

The invention discloses a method for electric generator frequency measurement based on PLC high-speed input. The method comprises the following steps that input alternating current sine waves are shaped into square waves through a frequency shaping circuit, and after frequency division is conducted on the waves through a frequency dividing circuit, the waves correspond to high-frequency clock signals, so that a set of high-frequency pulse strings reflecting the frequency of an electric generator are obtained, the high-frequency pulse strings are input to the input end of a PLC, the high-frequency pulse strings are counted through the PLC, and when counted data are not changed, a counted value is in direct proportion to the frequency of the electric generator. A measurement device is simple in structure, when it is measured that only one input port of the PLC is occupied by the frequency of the electric generator, hardware configuration is reduced, cost is low, it is only required that a final counted value NT is measured, and the frequency of the electric generator is equal to the ratio between the high-frequency clock signal frequency and the final counted value NT.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method and device for measuring generator frequency based on PLC high-speed input. Background technique [0002] At present, the commonly used method of measuring generator frequency through PLC high-speed input, as shown in "A Frequency Measuring Device for Hydrogenerator Set" (Patent No.: 201310465380.1), requires PLC to be equipped with an interrupt input module to stop according to the interrupt signal PLC's count. This method needs to configure an interrupt input port or an interrupt module additionally, which increases the cost of the system. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a method and device for measuring generator frequency based on PLC high-speed input with low cost and high reliability. [0004] The technical solution of the present invention to solve the above-mentioned problem is: a k...

Claims

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Application Information

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IPC IPC(8): G01R23/10
Inventor 刘伟戴凯兰骞周松萍
Owner HNAC TECH
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