Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and device for taking value of analog signal based on three-way input of turbine speed control system

A technology of analog signal and speed control system, applied in safety devices, mechanical equipment, hydroelectric power generation, etc., can solve the problems of low signal quality and inability to obtain the true value of the signal, achieve accurate and reliable control, enhance the adjustment quality and equipment availability rate, the effect of improving authenticity and quality

Active Publication Date: 2021-08-31
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] This method also has the hidden danger of not being able to obtain the true value of the signal, and the quality of the obtained signal is not high

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for taking value of analog signal based on three-way input of turbine speed control system
  • Method and device for taking value of analog signal based on three-way input of turbine speed control system
  • Method and device for taking value of analog signal based on three-way input of turbine speed control system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 1 As shown, a hydraulic turbine speed control system is based on a three-way input analog signal value method, which is used to perform three-way input analog signals of at least one of the hydraulic turbine servomotor displacement signal, active power signal and PT machine frequency signal. To judge the value, the method includes:

[0042] S1: Read the status of the three acquisition channels, and judge the fault conditions of the three acquisition channels. If all the three acquisition channels are normal, execute step S21;

[0043] S21: Determine whether the deviation between the three input analog signals exceeds the set threshold N, if not, execute step S31, if yes, execute step S32;

[0044] S31: take the middle value of the three input analog signals as the effective value;

[0045] S32: If the input signal is an active power signal, it is judged as a signal failure; if the input signal is a hydraulic turbine servomotor displacement signal or a P...

Embodiment 2

[0052] In this embodiment, the displacement signal of the hydraulic turbine servomotor is described.

[0053] Three inputs for displacement signals of hydraulic turbine servomotors:

[0054] When the three input channels are normal and the deviation between the three input signals does not exceed the set threshold N, take the median value of the three input analog signals as the effective value;

[0055]When the three input channels are all normal, the deviation between the signal values ​​input by two channels is smaller than the set threshold M, but the deviation between the signal input by the third channel and the signals input by the first two channels exceeds the set threshold M. If the threshold value N is set, according to the channel number, select the value of the input signal value of one of the channels whose input signal value deviation is less than M as the effective value; otherwise, judge the signal failure and process according to the signal failure, that is, ...

Embodiment 3

[0074] This embodiment is described for the active power signal.

[0075] Three inputs for active power signals:

[0076] When the three input channels are all normal, and the deviation between the three input signals does not exceed the set threshold N, take the median value of the three input analog signals as the effective value;

[0077] When the three input channels are normal and the deviation between the three input signals exceeds the set threshold N, it will be treated as a signal failure;

[0078] When any channel is faulty and the deviation between the signals input by the other two normal channels does not exceed the set threshold N, according to the channel number, select the value of the signal input by the normal channel with the first serial number as the effective value; otherwise , judge the signal failure, and deal with it according to the signal failure, that is, keep the control output before the failure, the system is downgraded from the power adjustment...

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

PUM

No PUM Login to View More

Abstract

The present invention provides a three-way input analog signal value acquisition method and device for a water turbine speed control system, which is used for three-way input simulation of at least one of the hydraulic turbine servomotor displacement signal, active power signal and PT machine frequency signal The signal is judged and valued. When the three inputs of the analog signal are normal, according to the input signal type, the final effective value of the signal is determined by the deviation between the three inputs or it is judged as a signal failure. The present invention determines the final value of the analog signal by judging whether the analog signal acquisition channel itself is normal and whether the deviation between the analog signals collected by each channel exceeds the limit, improves the authenticity and quality of the acquired signal, and makes the water turbine speed control system The control is more accurate and reliable, which enhances the power and frequency regulation quality and equipment availability of the hydroelectric unit during power generation, and plays a vital supporting role in maintaining the stable, safe and efficient operation of the power grid.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower automation, in particular to a method and device for acquiring values ​​of analog signals based on three-way input for a water turbine speed regulating system. Background technique [0002] In order to improve the reliability of the turbine speed control system, in recent years, more and more hydropower units have adopted a three-way redundancy method when collecting important analog feedback signals such as the servomotor displacement, active power, and PT machine frequency. According to the three-way The value of the signal comparison judgment. At present, the industry mainly has the following two methods for judging the value of the three inputs of the above three analog signals: [0003] 1) Simply take the middle of the three [0004] Simply take the middle value from the signals collected by the three channels. When the deviation between the signals is large, the signal obta...

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

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F03B15/08F03B11/00
CPCF03B11/008F03B15/08Y02E10/20
Inventor 张建明李娜张治宇刘同安侯锐李佶蔡群郑楚艾于尚北欧适伍盛金
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com