CN108287007B - Intelligent water level monitor based on data fusion technology - Google Patents

Intelligent water level monitor based on data fusion technology Download PDF

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Publication number
CN108287007B
CN108287007B CN201710012784.3A CN201710012784A CN108287007B CN 108287007 B CN108287007 B CN 108287007B CN 201710012784 A CN201710012784 A CN 201710012784A CN 108287007 B CN108287007 B CN 108287007B
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water level
data
input
interface terminal
sensor
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CN108287007A (en
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徐永兵
李贵清
孙水英
田间
刘双练
朱永峰
王玉梅
袁东
刘艋
李延开
张海波
赵大光
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Shandong Survey and Design Institute of Water Conservancy Co Ltd
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Shandong Survey and Design Institute of Water Conservancy Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/80—Arrangements for signal processing
    • G01F23/802—Particular electronic circuits for digital processing equipment
    • G01F23/804—Particular electronic circuits for digital processing equipment containing circuits handling parameters other than liquid level

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Acoustics & Sound (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

The invention discloses an intelligent water level monitor based on a data fusion technology, which comprises: the touch screen unit is used for manually calibrating and setting the elevation, the upper and lower water level limits, the proportion and the calibration parameters of the input and output unit and giving an alarm prompt; the programmable controller unit is used for comparing and analyzing the water level monitoring data transmitted by the input and output unit; the input and output unit is used for monitoring water level data. According to the invention, a plurality of sensing units are used for sensing the measured water level simultaneously, the output of the sensing units is a calculated value obtained through a data fusion algorithm, and the measurement precision of the water level is obviously improved according to an error theory; the device introduces a temperature compensation mechanism, so that the measurement error caused by temperature change can be reduced; the device can intelligently identify the water level sensor with faults, and can automatically calibrate and calibrate the water level sensor, so that the mean fault interval time of the water level monitoring equipment is prolonged, and the operation and maintenance workload is reduced.

Description

Intelligent water level monitor based on data fusion technology
Technical Field
The invention belongs to the technical field of water level monitoring, and particularly relates to an intelligent water level monitor based on a data fusion technology.
Background
The current water level measuring instruments mainly comprise a floater water level meter, a piezoresistive water level meter, a radar water level meter, an ultrasonic water level meter, an electronic water gauge and the like, and because the field working environment of the water level measuring instruments is severe, the failure rate of photoelectric devices in the instruments is high, so that the whole water level measuring instrument cannot work, the whole automatic control system fails, and even disastrous accidents are caused.
A series of problems such as drift, temperature drift, accuracy, interference killing feature, stability and the like generally exist in the current water level sensor, especially electric flashover and lightning stroke under the severe weather condition easily cause the fault frequency of the water level sensor, and then the whole water level measuring instrument can not work, so that the whole water delivery dispatching automatic control system is out of order, and even major safety accidents are caused.
The water level sensors with different principles used at present are susceptible to the change of external conditions such as atmosphere, temperature, illumination, water quality and the like after long-time use. Due to the reasons, the measurement error value of the water level sensor is large, and the equipment needs to be calibrated and corrected frequently, so that the workload of maintenance personnel and the maintenance cost of the equipment are increased.
Meanwhile, a plurality of sets of water level monitoring equipment are used as a water level monitoring setting mode of redundancy backup, and because the data measured by each sensor are independent, the data cannot be mutually supported and correlated, and the water level monitoring precision cannot be improved; when the main water level measuring device fails, the standby water level measuring device is possibly brought into use to cause the jumping change of water level monitoring data, so that the automatic control system for water delivery dispatching generates misoperation.
Disclosure of Invention
The invention aims to provide an intelligent water level monitor based on a data fusion technology, aiming at solving the problem that the whole automatic control system fails due to the fact that the whole water level measuring instrument cannot work because the fault rate of an optoelectronic device in the current water level measuring instrument is high; the water level sensor in the water level measuring instrument is subjected to electric flashover and lightning stroke under the severe weather condition, so that the fault of the water level sensor is prone to frequent occurrence, the whole water level measuring instrument cannot work, the whole water delivery dispatching automatic control system fails, and even major safety accidents are caused; the error value measured by the water level sensor is large, equipment needs to be calibrated and corrected frequently, and the workload of maintenance personnel and the maintenance cost of the equipment are increased; the data measured by each sensor are independent, and can not support and correlate with each other, and the accuracy of water level monitoring can not be improved.
The invention is realized in this way, an intelligent water level monitor based on data fusion technology, the intelligent water level monitor based on data fusion technology includes:
the touch screen unit is arranged on the equipment box body, is connected with the programmable controller unit and is used for manually calibrating and setting the elevation, the upper and lower limits of the water level, the proportion and the calibration parameters of the input and output unit and giving an alarm prompt;
the programmable controller unit is arranged on the equipment box body, is connected with the input and output unit, and is used for comparing and analyzing the water level monitoring data transmitted by the input and output unit and transmitting a control instruction to the input and output unit;
and the input and output unit is arranged on the equipment box body, is connected with the programmable controller unit and is used for monitoring water level data and transmitting the monitored data to the programmable controller unit.
Further, the touch screen unit includes:
the main picture is used for displaying the state of the sensor and the parameter information of the sensor;
a parameter setting interface for setting water level elevation, water level upper limit, proportion and calibration value; the elevation is the current elevation of the gate station, the upper limit of the water level is the highest alarm water level under the normal operation condition of the gate station, the proportion is the relation between the digital quantity and the water level corresponding to each sensor of the input and output unit in the program, and the calibration value is the error value between the water level value obtained after operation and the actual value;
and the alarm prompt interface is used for carrying out fault alarm prompt when the data transmitted by each sensor of the input and output unit is invalid.
Further, the programmable controller unit includes a programmable controller including:
the CPU module is responsible for data calculation and is in signal connection with the touch screen;
the DI module is responsible for collecting signals of the floater water level sensor;
the AI module is responsible for collecting radar water level sensor signals, ultrasonic water level sensor signals, piezoresistive water level sensor signals, electronic water gauge signals and temperature sensor signals;
the DO module is responsible for outputting a heavy fault alarm signal and a light fault alarm signal;
the AO module is responsible for outputting a 4-20mA signal of a water level measured value;
the RS485 communication module is used for communicating with other equipment;
and the power supply module is used for supplying power to the CPU module, the DI module, the AI module, the DO module, the AO module and the RS485 communication module.
Further, the programmable controller unit further comprises:
the signal distributor is connected with the programmable controller and is used for dividing the input collected real-time water level data into two paths of signals, one path of signals is used for being input to the programmable controller, the other path of signals is in a standby state, and when the programmable controller breaks down, the collected real-time water level data can be transmitted to equipment capable of reading the signals at any time;
the signal distributor includes: the first signal distributor, the second signal distributor, the third signal distributor, the fourth signal distributor and the fifth signal distributor are connected with the programmable controller through signal lines;
the instrument signal input and output interface comprises: the sensor comprises a floater water level sensor input interface terminal, a floater water level sensor bypass output interface terminal, a radar water level sensor input interface terminal, a radar water level sensor bypass output interface terminal, an ultrasonic water level sensor input interface terminal, an ultrasonic water level sensor bypass output interface terminal, a piezoresistive water level sensor input interface terminal, a piezoresistive water level sensor bypass output interface terminal, an electronic water gauge input interface terminal, an electronic water gauge bypass output interface terminal, a heavy fault alarm signal output interface terminal, a light fault alarm signal output interface terminal, a water level measurement value output communication interface plug, a heavy fault alarm signal output interface terminal, a light fault alarm signal output interface terminal and a water level measurement value output communication interface plug; the heavy fault alarm signal output interface terminal, the light fault alarm signal output interface terminal, the water level measurement value output communication interface plug, the heavy fault alarm signal output interface terminal, the light fault alarm signal output interface terminal and the water level measurement value output communication interface plug are all connected with the programmable controller through signal lines;
the first signal distributor is respectively connected with the input interface terminal of the floater water level sensor and the bypass output interface terminal of the floater water level sensor through signal wires;
the second signal distributor is respectively connected with the input interface terminal of the radar level sensor and the bypass output interface terminal of the radar level sensor through signal wires;
the third signal distributor is respectively connected with the ultrasonic water level sensor input interface terminal and the ultrasonic water level sensor bypass output interface terminal through signal lines;
the fourth signal distributor is respectively connected with the piezoresistive water level sensor input interface terminal and the piezoresistive water level sensor bypass output interface terminal through signal wires;
and the fifth signal distributor is respectively connected with the electronic water gauge input interface terminal and the electronic water gauge bypass output interface terminal through signal lines.
Further, the input-output unit includes:
the floater water level meter is connected with the first signal distributor, and the first signal distributor is connected with the programmable controller unit and used for acquiring real-time water level data;
the piezoresistive water level meter is connected with the second signal distributor, and the second signal distributor is connected with the programmable controller unit and used for collecting real-time water level data;
the radar water level gauge is connected with the third signal distributor, and the third signal distributor is connected with the programmable controller unit and used for acquiring real-time water level data;
the ultrasonic water level meter is connected with the fourth signal distributor, and the fourth signal distributor is connected with the programmable controller unit and used for acquiring real-time water level data;
and the electronic water gauge is connected with the fifth signal distributor, and the fifth signal distributor is connected with the programmable controller unit and used for acquiring real-time water level data.
Further, the input-output unit further includes:
the temperature sensor is connected with the programmable controller unit and used for acquiring real-time temperature data;
and the instrument signal input and output interface is arranged on the surface of the equipment box body, is connected with the remote control unit and is used for transmitting signals.
Another object of the present invention is to provide a method for controlling a programmable controller unit, the method comprising the steps of:
3) firstly, completing equipment installation and switching on a power supply;
4) initializing equipment from a main interface of the touch screen, and clearing data pre-stored in the equipment; then inputting relevant parameters such as elevation, upper limit of water level, proportion, correction coefficient and the like of the water level gauge to complete the setting of data;
3) after the acquired water level value is judged to be effective, weight coefficient fusion calculation is carried out on data acquired by a floater water level meter, a piezoresistive water level meter, a radar water level meter, an ultrasonic water level meter and an electronic water gauge of the input and output unit, and data with low weight coefficient is calibrated;
4) calculating according to a final fusion estimation value formula to obtain a final fusion calculation value;
5) after the final fusion calculation value is obtained, the temperature compensation data set is judged, and if the temperature compensation data set needs to be updated, the temperature compensation data set is updated; if the final fusion calculation value does not need to be updated, carrying out temperature compensation fuzzy operation on the final fusion calculation value according to the array; thereby obtaining the final effective water level;
6) and entering the next acquisition period.
Further, the method for performing weight coefficient fusion calculation on data acquired by a float water level gauge, a piezoresistive water level gauge, a radar water level gauge, an ultrasonic water level gauge and an electronic water gauge of the input and output unit comprises the following steps:
measuring the same water level from different directions by using a float water level gauge, a piezoresistive water level gauge, a radar water level gauge, an ultrasonic water level gauge and an electronic water gauge, wherein the measured data of an ith sensor is x at the moment of ki(k) Wherein i is 1, 2, 3, 4, 5; if xi(k) And xj(k) The larger the difference a (i, j) indicates that the observed values of the two sensors at the moment are lower in mutual support; if xi(k) And xj(k) The observed values of the two sensors are close to each other, the observed values at the moment are relatively high in support degree, the reality of the observed values is higher, and the support degree of the multiple sensors is defined as the support degree; the support function is: sij(k)＝2arccot(|a(i，j)|)/π；
The smaller is | a (i, j) | the smaller is sij(k) The larger the number of the observation values is, the higher the support degree of the 2 observation values at the moment is, and when | a (i, j) | is larger than a certain value delta (delta is larger than or equal to 0), s isij(k) A value of 0;
if it is not
Figure BSA0000138825950000051
The value of (d) is larger, which indicates that the observed value of the ith sensor at the moment is consistent with that of the majority of sensors; otherwise, the observation value of the ith sensor deviates from the observation values of the majority of sensors;
then, a weight coefficient is obtained according to the support degrees of the float water level gauge, the piezoresistive water level gauge, the radar water level gauge, the ultrasonic water level gauge and the electronic water gauge, and the weight coefficient formula is as follows:
Figure BSA0000138825950000061
obtaining a final fusion estimation value expression according to a weight coefficient formula:
Figure BSA0000138825950000062
furthermore, after manual calibration, when data transmitted by a certain input/output unit sensor unit is collected, the validity of the data is judged firstly; when the water level is in a state of normal operation of the input and output unit, the input and output unit has small water level change when water flow is static; if the water level changes greatly in a short time, the input and output unit fails, and the measured water level value is invalid.
Compared with the prior art, the invention has the beneficial effects that: the invention can be simultaneously connected with a plurality of water level monitoring sensors with the same or different principles, and the water level monitoring information acquisition work is not influenced as long as one sensor works normally, thereby greatly improving the reliability of the water delivery dispatching automatic control system; (ii) a The monitor simultaneously senses measured water by utilizing a plurality of water level meters, the output of the monitor is a data fusion calculation value, and according to an error theory, the measurement precision of the water level is improved; the device introduces a temperature compensation mechanism, so that the measurement error caused by temperature change can be reduced; the device can intelligently identify the fault sensor and automatically calibrate and calibrate the sensor, so that the mean fault interval time of the water level monitoring equipment is prolonged and the workload of operation and maintenance is reduced.
The invention uses the sensors of various different principles of the float water level gauge, the piezoresistive water level gauge, the radar water level gauge, the ultrasonic water level gauge and the electronic water gauge to simultaneously sense the measured quantity. The detector has the function of signal bypass output, and can ensure that signals are transmitted to the RTU while an interface is reserved for connecting to other signal reading equipment. The single sensors of the float water level gauge, the piezoresistive water level gauge, the radar water level gauge, the ultrasonic water level gauge and the electronic water gauge are in failure, and the multi-channel intelligent water level monitor based on the data fusion technology can continue to operate. The equipment has a self-calibration function based on a data fusion technology, and the weights of different equipment are calculated according to the technology, so that a more accurate water level value is obtained. The invention adopts the median filtering principle, can remove data with the characteristics of out-of-range and overlarge instantaneous jump, and can effectively give an alarm in time when the water level value acquired by the equipment is in a special value range.
Drawings
FIG. 1 is a schematic diagram of a multi-channel intelligent water level measuring instrument based on data fusion technology according to an embodiment of the present invention;
fig. 2 is a schematic diagram of connection of the equipment box provided by the embodiment of the invention.
In the figure: 1. a touch screen unit; 2. a programmable controller unit; 3. an input/output unit; 4. an equipment box body.
FIG. 3 is a flow chart of a method for controlling a programmable controller unit according to an embodiment of the present invention;
FIG. 4 is a plan view of the bottom of the equipment cabinet provided by an embodiment of the present invention;
FIG. 5 is a front view of an equipment cabinet provided by an embodiment of the present invention;
FIG. 6 is a first initial image of a touch screen unit according to an embodiment of the present invention;
FIG. 7 is a diagram of a second initial screen of a touch screen unit according to an embodiment of the present invention;
fig. 8 is a third diagram of an initial screen of a touch screen unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
As shown in fig. 1 and 2, an intelligent water level monitor based on data fusion technology according to an embodiment of the present invention includes:
the touch screen unit 1 is arranged on the equipment box body, is connected with the programmable controller unit, and is used for manually calibrating and setting the elevation, the upper and lower water level limits, the proportion and the calibration parameters of the input and output unit and giving an alarm prompt;
the programmable controller unit 2 is arranged on the equipment box body 4, is connected with the input and output unit, and is used for comparing and analyzing the water level monitoring data transmitted by the input and output unit and transmitting a control instruction to the input and output unit;
and the input and output unit 3 is arranged on the equipment box body, is connected with the programmable controller unit, and is used for monitoring water level data and transmitting the monitored data to the programmable controller unit.
The touch screen unit includes:
the main picture is used for displaying the state of the sensor and the parameter information of the sensor;
a parameter setting interface for setting water level elevation, water level upper limit, proportion and calibration value; the elevation is the current elevation of the gate station, the upper limit of the water level is the highest alarm water level under the normal operation condition of the gate station, the proportion is the relation between the digital quantity and the water level corresponding to each sensor of the input and output unit in the program, and the calibration value is the error value between the water level value obtained after operation and the actual value;
and the alarm prompt interface is used for carrying out fault alarm prompt when the data transmitted by each sensor of the input and output unit is invalid.
The programmable controller unit includes a programmable controller including:
and the CPU module is responsible for data calculation and is in signal connection with the touch screen.
And the DI module is responsible for collecting signals of the floater water level sensor.
And the AI module is responsible for acquiring radar level sensor signals, ultrasonic level sensor signals, piezoresistive level sensor signals, electronic water gauge signals and temperature sensor signals.
And the DO module is responsible for outputting a heavy fault alarm signal and a light fault alarm signal.
And the AO module is responsible for outputting a 4-20mA signal of the water level measured value.
And the RS485 communication module are responsible for communicating with other equipment.
And the power supply module is used for supplying power to the CPU module, the DI module, the AI module, the DO module, the AO module and the RS485 communication module.
The programmable controller unit further comprises:
the signal distributor is connected with the programmable controller and is used for dividing the input collected real-time water level data into two paths of signals, one path of signals is used for being input to the programmable controller, the other path of signals is in a standby state, and when the programmable controller breaks down, the collected real-time water level data can be transmitted to equipment capable of reading the signals at any time;
the signal distributor includes: the first signal distributor, the second signal distributor, the third signal distributor, the fourth signal distributor and the fifth signal distributor are connected with the programmable controller through signal lines;
the instrument signal input and output interface comprises: the sensor comprises a floater water level sensor input interface terminal, a floater water level sensor bypass output interface terminal, a radar water level sensor input interface terminal, a radar water level sensor bypass output interface terminal, an ultrasonic water level sensor input interface terminal, an ultrasonic water level sensor bypass output interface terminal, a piezoresistive water level sensor input interface terminal, a piezoresistive water level sensor bypass output interface terminal, an electronic water gauge input interface terminal, an electronic water gauge bypass output interface terminal, a heavy fault alarm signal output interface terminal, a light fault alarm signal output interface terminal, a water level measurement value output communication interface plug, a heavy fault alarm signal output interface terminal, a light fault alarm signal output interface terminal and a water level measurement value output communication interface plug; the heavy fault alarm signal output interface terminal, the light fault alarm signal output interface terminal, the water level measurement value output communication interface plug, the heavy fault alarm signal output interface terminal, the light fault alarm signal output interface terminal and the water level measurement value output communication interface plug are all connected with the programmable controller through signal lines;
the first signal distributor is respectively connected with the input interface terminal of the floater water level sensor and the bypass output interface terminal of the floater water level sensor through signal wires;
the second signal distributor is respectively connected with the input interface terminal of the radar level sensor and the bypass output interface terminal of the radar level sensor through signal wires;
the third signal distributor is respectively connected with the ultrasonic water level sensor input interface terminal and the ultrasonic water level sensor bypass output interface terminal through signal lines;
the fourth signal distributor is respectively connected with the piezoresistive water level sensor input interface terminal and the piezoresistive water level sensor bypass output interface terminal through signal wires;
and the fifth signal distributor is respectively connected with the electronic water gauge input interface terminal and the electronic water gauge bypass output interface terminal through signal lines.
The input-output unit includes:
the floater water level meter is connected with the first signal distributor, and the first signal distributor is connected with the programmable controller unit and used for acquiring real-time water level data;
the piezoresistive water level meter is connected with the second signal distributor, and the second signal distributor is connected with the programmable controller unit and used for collecting real-time water level data;
the radar water level gauge is connected with the third signal distributor, and the third signal distributor is connected with the programmable controller unit and used for acquiring real-time water level data;
the ultrasonic water level meter is connected with the fourth signal distributor, and the fourth signal distributor is connected with the programmable controller unit and used for acquiring real-time water level data;
and the electronic water gauge is connected with the fifth signal distributor, and the fifth signal distributor is connected with the programmable controller unit and used for acquiring real-time water level data.
The input-output unit further includes:
the temperature sensor is connected with the programmable controller unit and used for acquiring real-time temperature data;
and the instrument signal input and output interface is arranged on the surface of the equipment box body, is connected with the remote control unit and is used for transmitting signals.
The application of the principles of the present invention will be further described with reference to the accompanying drawings and specific embodiments.
The device function of the embodiment of the invention comprises:
the water level monitoring is the most important parameter of water resource scheduling projects such as south-to-north water transfer, Jiaodong water supply and the like, a series of problems of time drift, temperature drift, accuracy, anti-jamming capability, stability and the like generally exist in the traditional water level monitoring instrument, so that the fault of the water level monitoring equipment is frequent, the fault of the water level monitoring equipment can cause the failure of the whole automatic water delivery scheduling control system, and even great safety accidents are caused. The intelligent water level monitor based on the data fusion technology can automatically detect the sensor with obviously reduced measurement precision and can automatically calibrate and calibrate the sensor, thereby improving the mean fault interval time of the water level monitoring equipment and reducing the workload of operation and maintenance.
The invention is mainly characterized in that: strong stability, self calibration, temperature compensation and bypass output.
The stability is high: the water level is measured by five sensors with different principles, namely a float water level gauge, a piezoresistive water level gauge, a radar water level gauge, an ultrasonic water level gauge and an electronic water gauge, and the acquisition of water level monitoring information is not influenced as long as one sensor works normally, so that the fault time and probability of automatic water level monitoring equipment are reduced, and the reliability of an automatic control system is improved.
Self-calibration: the remote control unit collects data of five sensors with different principles, the collected data are compared and analyzed after filtering, and when one of the water level gauge sensors fails, the other sensors are used for calibrating the measured value of the failed equipment, so that an accurate measured value is obtained.
Temperature compensation: the remote control unit can establish water level data groups at different temperatures according to water level measurement data obtained at different temperatures under the same water regime, and the water level data groups are used as the basis of temperature compensation. And then, when the equipment normally runs, calculating temperature compensation data according to the temperature at that time, and adjusting and optimizing the water level so as to obtain a more accurate water level value.
And (3) bypass output: the monitor is provided with the deconcentrator which is used for dividing an input water level acquisition signal into two paths of signals, wherein one path of signal is input to the programmable controller unit, and the other path of signal is in a standby state, so that the water level acquisition signal can be transmitted to equipment capable of reading the signal at any time when the programmable controller unit fails or is in other necessary states, and the diversity of water level signal transmission is ensured.
The working process is as follows: the equipment is installed and used for the first time, and manual system initialization is needed to be carried out on a main menu of the equipment. The initialization process can clear the setting parameters (such as the height setting, the upper and lower water level limits, the proportion, the calibration and the like of the float water level meter) which possibly exist before the equipment, so that the subsequent use and measurement are prevented from being influenced.
After initialization, manual calibration and calibration of relevant parameters are required in the main menu of the device.
The main menu of the equipment comprises a main picture, a parameter setting interface and an alarm prompting interface. And setting elevation, water level upper limit, proportion and calibration value on a parameter setting interface. The elevation represents the current elevation of the gate station, the upper water level limit refers to the highest alarm water level under the normal operation condition of the gate station, the proportion refers to the relation between the digital quantity and the water level corresponding to the sensor in the program, and the calibration value refers to the error value between the water level value obtained after operation and the actual value.
For example, the water level range is 2-5m, the elevation is 2m, the upper limit of the water level is 5m, the current transmitted by the float water level meter is 4-20mA, and the corresponding digital quantity converted by the AI module is 0-10000, the proportion required to be input into the float water level meter is 0.33, and the calibration value is 300 (the water level value is 10000 × 0.33.33-300 + 2000-5000 mm).
After manual calibration and calibration of sensor output are completed, parameters such as elevation, upper limit, proportion, calibration value and the like are set, and accurate water level value transmitted by the sensor can be obtained through calculation.
The program automatically detects the acquired water level value, analyzes and judges whether the water level value is effective or not.
The conditions of whether the water level value is valid or not include:
when the water flow is static, the water level changes little under the state that the input and output unit normally operates; if the water level is greatly changed in a short time, the water level sensor unit is out of order and the measured water level value is invalid.
If the water level data measured by the float water level gauge, the piezoresistive water level gauge, the radar water level gauge, the ultrasonic water level gauge and the electronic water gauge are detected to be effective, data fusion calculation needs to be carried out on the water level measurement values of the five sensors.
Measuring the same water level from different directions by using 5 sensors with different principles, wherein the measured data of the ith sensor is x at the moment of ki(k) Wherein i is 1, 2, 3, 4, 5. If xi(k) And xj(k) The larger the difference a (i, j) indicates that the observed values of the two sensors at the moment are lower in mutual support; if xi(k) And xj(k) And closely, if the observed values of the two sensors at the moment are relatively high in mutual support degree, the reality of the observed values is higher, and the support degree of the multiple sensors is defined as the support degree. The support function is: sij(k)＝2arccot(|a(i，j)|)/π。
The smaller is | a (i, j) | the smaller is sij(k) The larger the number of the observation values is, the higher the support degree of the 2 observation values at the moment is, and when | a (i, j) | is larger than a certain value delta (delta is larger than or equal to 0), s isij(k) The value is 0.
If it is not
Figure BSA0000138825950000121
The value of (d) is larger, which indicates that the observed value of the ith sensor at the moment is consistent with that of the majority of sensors; and conversely, the observation value of the ith sensor deviates from the observation value of the majority of sensors.
Then, according to the support degree of each sensor, a weight coefficient can be obtained, and the weight coefficient formula is:
Figure BSA0000138825950000122
according to the weight coefficient formula, a final fusion estimation value expression can be obtained:
Figure BSA0000138825950000123
when the weight coefficient is calculated, whether the sensor needs to be corrected or not can be judged according to the weight coefficient. When the weighting factor of a certain sensor is too low, a correction is needed. And correcting the data of the sensor according to the data of other sensors with higher weight coefficients, and calculating a final fusion calculation value according to a final fusion estimation value expression after correction.
After the data after the fusion calculation is obtained, the final fusion calculation value needs to be subjected to temperature compensation fuzzy operation. Firstly, judging whether the temperature compensation data set is valid or not, and if the temperature compensation data set is invalid, updating the data set. And after the array is confirmed to be effective, carrying out temperature compensation fuzzy operation.
The calculation establishes a data set using the variation of the water level values measured by the sensors under a single condition of temperature variation only. Therefore, according to the array, fuzzy operation is carried out on the water level value of each temperature, and therefore a more accurate water level value is obtained.
As shown in fig. 3, a method for controlling a programmable controller unit according to an embodiment of the present invention includes the following steps:
1. the installation of the device is first completed and the power is turned on.
2. And initializing the equipment from the main interface of the touch screen, and clearing the data pre-stored in the equipment. Then inputting relevant parameters such as elevation, upper limit of water level, proportion, correction coefficient and the like of the water level meter to complete the setting of data.
After manual calibration, the control unit can judge the validity of data when collecting sensor data, and the condition whether the water level value is valid includes: when the water level is in a normal operation state of the sensor, the water level value of the sensor is between 2 and 5 m; since the water level changes little when the gate is not moving, when the gate is still, if the water level changes much in a short time, the sensor is considered to be in fault, and the measured water level value is invalid.
3. And after the acquired water level value is judged to be valid, weight coefficients are calculated for the data acquired by the five sensors, the data with low weight coefficients are calibrated, and the valid five data are obtained after calibration.
4. And calculating according to the final fusion estimation value formula and the five data obtained by the calculation to obtain a final fusion calculation value.
5. After the final fusion calculation value is obtained, the temperature compensation data set is judged, and if the temperature compensation data set needs to be updated, the temperature compensation data set is updated; and if the final fusion calculation value does not need to be updated, performing temperature compensation fuzzy operation on the final fusion calculation value according to the array. Thereby obtaining the final effective water level.
6. And entering the next acquisition period.
FIG. 4 is a bottom plan view of a cabinet view of an apparatus provided by an embodiment of the present invention;
fig. 5 is a front view of an apparatus cabinet according to an embodiment of the present invention.
FIG. 6 is a first initial image of a touch screen unit according to an embodiment of the present invention;
FIG. 7 is a diagram of a second initial screen of a touch screen unit according to an embodiment of the present invention;
fig. 8 is a third diagram of an initial screen of a touch screen unit according to an embodiment of the present invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (6)

1. The utility model provides an intelligent water level monitor based on data fusion technique which characterized in that, intelligent water level monitor based on data fusion technique includes:
the touch screen unit is arranged on the equipment box body, is connected with the programmable controller unit and is used for manually calibrating and setting the elevation, the upper and lower limits of the water level, the proportion and the calibration parameters of the input and output unit and giving an alarm prompt;
the programmable controller unit is arranged on the equipment box body, is connected with the input and output unit, and is used for comparing and analyzing the water level monitoring data transmitted by the input and output unit and transmitting a control instruction to the input and output unit;
the input and output unit is arranged on the equipment box body, is connected with the programmable controller unit and is used for monitoring water level data and transmitting the monitored data to the programmable controller unit;
the programmable controller unit control method of the intelligent water level monitor based on the data fusion technology comprises the following steps:
1) the installation of the device is first completed and the power is turned on,
2) initializing equipment from a main interface of the touch screen, clearing data pre-stored in the equipment, and then inputting relevant parameters of an elevation, an upper limit of a water level, a proportion and a correction coefficient of a water level meter to complete the setting of the data;
3) after judging that the acquired water level value is effective, performing weight coefficient fusion calculation on data acquired by a floater water level meter, a piezoresistive water level meter, a radar water level meter, an ultrasonic water level meter and an electronic water gauge of an input and output unit, calibrating data with low weight coefficient, and obtaining effective five data after calibration;
4) calculating according to the final fusion estimation value formula and five calculated data to obtain a final fusion calculation value;
5) after the final fusion calculation value is obtained, the temperature compensation data set is judged, and if the temperature compensation data set needs to be updated, the temperature compensation data set is updated; if the final fusion calculation value does not need to be updated, carrying out temperature compensation fuzzy operation on the final fusion calculation value according to the temperature compensation data group; thereby obtaining the final effective water level;
6) entering the next acquisition period;
the method for performing weight coefficient fusion calculation on data acquired by a floater water level gauge, a piezoresistive water level gauge, a radar water level gauge, an ultrasonic water level gauge and an electronic water gauge of an input and output unit comprises the following steps:
measuring the same water level from different directions by using a float water level gauge, a piezoresistive water level gauge, a radar water level gauge, an ultrasonic water level gauge and an electronic water gauge, wherein the ith sensor measures the same water level at the moment kThe measured data is Xi(k) Wherein i is 1, 2, 3, 4, 5; if Xi(k) And Xj(k) The larger the difference a (i, j) indicates that the observed values of the two sensors at the moment are lower in mutual support; if X isi(k) And Xj(k) The observed values of the two sensors are close to each other, the observed values at the moment are relatively high in support degree, the reality of the observed values is higher, and the support degree of the multiple sensors is defined as the support degree; the support function is: sij(k)＝2arccot(|a(i，j)|)/π；
The smaller the | a (i, j) | is, the Sij(k) The larger the number of the observation values is, the higher the support degree of the 2 observation values at the moment is, and when | a (i, j) | is larger than a certain value delta (delta is larger than or equal to 0), S isij(k) A value of 0;
if it is not
Figure FSB0000186963470000021
The value of (d) is larger, which indicates that the observed value of the ith sensor at the moment is consistent with that of the majority of sensors; otherwise, the observation value of the ith sensor deviates from the observation values of the majority of sensors;
then, a weight coefficient is obtained according to the support degrees of the float water level gauge, the piezoresistive water level gauge, the radar water level gauge, the ultrasonic water level gauge and the electronic water gauge, and the weight coefficient formula is as follows:
Figure FSB0000186963470000022
obtaining a final fusion estimation value expression according to a weight coefficient formula:
Figure FSB0000186963470000023
after manual calibration, when data transmitted by the input and output unit are collected, the validity of the data is judged; under the condition that the water level is in a normal operation state of the input and output unit, the water level value of the input and output unit is 2-5 m; when the gate is not moved, the water level change is very small; when the gate is static, if the water level changes greatly in a short time, the input and output unit goes wrong, and the measured water level value is invalid.
2. The intelligent water level monitor based on data fusion technology as claimed in claim 1, wherein the touch screen unit comprises:
the main picture is used for displaying the state of the sensor and the parameter information of the sensor;
a parameter setting interface for setting water level elevation, water level upper limit, proportion and calibration value; the elevation is the current elevation of the gate station, the upper limit of the water level is the highest alarm water level under the normal operation condition of the gate station, the proportion is the relation between the digital quantity of each sensor of the input and output unit to the seat in the program and the water level, and the calibration value is the error value between the water level value obtained after calculation and the actual value;
and the alarm prompt interface is used for carrying out fault alarm prompt when the data transmitted by each sensor of the input and output unit is invalid.
3. The intelligent water level monitor based on data fusion technology as claimed in claim 1, wherein the programmable controller unit comprises a programmable controller, and the programmable controller comprises:
the CPU module is responsible for data calculation and is in signal connection with the touch screen;
the DI module is responsible for collecting signals of the floater water level sensor;
the AI module is responsible for collecting radar water level sensor signals, ultrasonic water level sensor signals, piezoresistive water level sensor signals, electronic water gauge signals and temperature sensor signals;
the DO module is responsible for outputting a heavy fault alarm signal and a light fault alarm signal;
the AO module is responsible for outputting a 4-20mA signal of a water level measured value;
the RS485 communication module is used for communicating with other equipment;
and the power supply module is used for supplying power to the CPU module, the DI module, the AI module, the DO module, the AO module and the RS485 communication module.
4. The intelligent water level monitor based on data fusion technology as claimed in claim 1, wherein the input and output unit comprises:
the float water level meter is connected with the signal distributor 1, and the signal distributor 1 is connected with the programmable controller unit and used for acquiring real-time water level data;
the piezoresistive water level meter is connected with the signal distributor 2, and the signal distributor 2 is connected with the programmable controller unit and used for collecting real-time water level data;
the radar water level gauge is connected with the signal distributor 3, and the signal distributor 3 is connected with the programmable controller unit and used for acquiring real-time water level data;
the ultrasonic water level meter is connected with the signal distributor 4, and the signal distributor 4 is connected with the programmable controller unit and used for acquiring real-time water level data;
the electronic water gauge is connected with the signal distributor 5, and the signal distributor 5 is connected with the programmable controller unit and used for collecting real-time water level data.
5. The intelligent water level monitor based on data fusion technology as claimed in claim 1, wherein the input and output unit further comprises:
the temperature sensor is connected with the programmable controller unit and used for acquiring real-time temperature data of the water level;
and the instrument signal input and output interface is arranged on the surface of the equipment box body, is connected with the remote control unit and is used for transmitting signals.
6. The intelligent water level monitor based on data fusion technology as claimed in any one of claims 1-5, wherein the programmable controller unit further comprises:
the signal distributor is connected with the programmable controller and is used for dividing the input collected real-time water level data into two paths of signals, one path of signals is used for being input to the programmable controller, the other path of signals is in a standby state, and when the programmable controller breaks down, the collected real-time water level data can be transmitted to equipment capable of reading the signals at any time;
the signal distributor includes: the signal distributor 1, the signal distributor 2, the signal distributor 3, the signal distributor 4 and the signal distributor 5 are connected with a programmable controller through signal lines;
the instrument signal input and output interface comprises: the sensor comprises a floater water level sensor input interface terminal, a floater water level sensor bypass output interface terminal, a radar water level sensor input interface terminal, a radar water level sensor bypass output interface terminal, an ultrasonic water level sensor input interface terminal, an ultrasonic water level sensor bypass output interface terminal, a piezoresistive water level sensor input interface terminal, a piezoresistive water level sensor bypass output interface terminal, an electronic water gauge input interface terminal, an electronic water gauge bypass output interface terminal, a heavy fault alarm signal output interface terminal, a light fault alarm signal output interface terminal, a water level measurement value output communication interface plug, a heavy fault alarm signal output interface terminal, a light fault alarm signal output interface terminal and a water level measurement value output communication interface plug; the heavy fault alarm signal output interface terminal, the light fault alarm signal output interface terminal, the water level measurement value output communication interface plug, the heavy fault alarm signal output interface terminal, the light fault alarm signal output interface terminal and the water level measurement value output communication interface plug are all connected with the programmable controller through signal lines;
the signal distributor 1 is respectively connected with an input interface terminal of the floater water level sensor and a bypass output interface terminal of the floater water level sensor through signal wires;
the signal distributor 2 is respectively connected with an input interface terminal of the radar level sensor and a bypass output interface terminal of the radar level sensor through signal wires;
the signal distributor 3 is respectively connected with an ultrasonic water level sensor input interface terminal and an ultrasonic water level sensor bypass output interface terminal through signal lines;
the signal distributor 4 is respectively connected with a piezoresistive water level sensor input interface terminal and a piezoresistive water level sensor bypass output interface terminal through signal wires;
the signal distributor 5 is respectively connected with the electronic water gauge input interface terminal and the electronic water gauge bypass output interface terminal through signal lines.
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