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Analog signal valuing method and device based on three-path input for water turbine speed regulation system

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

Active Publication Date: 2021-07-13
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • 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

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  • Analog signal valuing method and device based on three-path input for water turbine speed regulation system
  • Analog signal valuing method and device based on three-path input for water turbine speed regulation system
  • Analog signal valuing method and device based on three-path input for water turbine speed regulation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] like 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 a hydraulic turbine relay displacement signal, an active power signal and a PT machine frequency signal. Judging 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, perform step S21;

[0043] S21: Determine whether the deviation between the analog signals inputted by the three channels exceeds the set threshold N, if not, go to step S31, if yes, go to 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 that the signal is faulty; if the input signal is the displacement signal of the hydro turbi...

Embodiment 2

[0052] This embodiment describes the displacement signal of the hydraulic turbine relay.

[0053] Three-way input for the displacement signal of the turbine relay:

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

[0055]When the three input channels are all normal, the deviation between the signal values ​​input by two channels is less than the set threshold M, but the deviation between the signal input from the third channel and the signals input from the first two channels exceeds the set value. If the threshold value N is set, then according to the channel serial number, select the value of the input signal value of one channel whose deviation of the value of the input signal at the front of the serial number is less than M as the valid value; Control output, and send out fault alarm signal at the same...

Embodiment 3

[0074] This embodiment describes the active power signal.

[0075] Three inputs for active power signals:

[0076] When the three input channels are normal, and the deviation between the three input signals does not exceed the set threshold N, the median value of the three input analog signals is taken 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 handled 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 serial number, the value of the signal input from the normal channel with the first serial number is selected as the effective value; otherwise , judge the signal fault, and deal with it according to the signal fault, that is, keep the control output before the fault, the system is downgraded from the power adjustme...

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Abstract

The invention provides an analog signal valuing method and device based on three-path input for a water turbine speed regulation system, which are used for judging and valuing three-way input analog signals of at least one of a displacement signal, an active power signal and a PT (potential transformer) machine frequency signal of a water turbine servomotor. When the three-path input of the analog signals are normal, according to the type of the input signal, a final signal effective value is determined or a signal fault is determined according to the deviation condition among the three-path input. According to the method, the final value of the analog signals is determined by determining whether an analog signal acquisition channel is normal and whether the deviation between the analog signals acquired by each channel exceeds the limit, so that the authenticity and the quality of the acquired signal are improved, the control of the water turbine speed regulation system is more accurate and reliable, the adjusting quality of power and frequency in the power generation process of a hydroelectric generating set and the availability rate of equipment are enhanced, and the method plays a crucial supporting role in maintaining stable, safe and efficient operation of a power grid.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower automation, in particular to a method and a device for taking a value of an analog signal based on a three-way input of a hydraulic turbine speed control 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 displacement of the turbine relay, active power, and PT machine frequency. The comparison of the signals determines the value. At present, the industry mainly has the following two methods for judging the value of the three-way input of the above three analog signals: [0003] 1) A simple three out of three [0004] Simply take the median value from the signals collected from the three channels. When the deviation between the signals is large, the signals obtained by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B15/08F03B11/00
CPCF03B15/08F03B11/008Y02E10/20
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
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