CN113029305B - Hydropower station water level measurement self-adaptive fault diagnosis and correction system and method - Google Patents
Hydropower station water level measurement self-adaptive fault diagnosis and correction system and method Download PDFInfo
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- CN113029305B CN113029305B CN202110320614.8A CN202110320614A CN113029305B CN 113029305 B CN113029305 B CN 113029305B CN 202110320614 A CN202110320614 A CN 202110320614A CN 113029305 B CN113029305 B CN 113029305B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
Abstract
The utility model provides a hydropower station water level measurement self-adaptation fault diagnosis correction system and method, includes sump pit, first liquid level sensor and second liquid level sensor, and first liquid level sensor and second liquid level sensor are located the sump pit bottom and the vertical position of installation is the same, are equipped with benchmark liquid level float switch in the sump pit, and the suction pipe of suction pump stretches into the sump pit bottom, and first liquid level sensor, second liquid level sensor, suction pump and benchmark liquid level float switch are connected with the switch board electricity; whether the two water level sensors at the bottom of the water collecting well have faults is primarily judged by detecting the numerical values of the two water level sensors through the controller, then whether adjustment correction is carried out is determined by comparing the indication difference values of the two sensors and whether the difference values are out of tolerance, and the liquid level numerical value adjustment quantity is determined by reducing the water collecting well liquid level to a reference value and detecting the current value of the reference liquid levels of the two sensors, so that automatic detection, fault warning and automatic correction can be achieved, and personnel are saved for inspection and manual correction.
Description
Technical Field
The invention relates to the field of hydropower station equipment control, in particular to a hydropower station water level measurement self-adaptive fault diagnosis and correction system and method.
Background
The water level control system of the water collecting well of the hydropower station controls the drainage pump through the height of the water level value of the water collecting well, and ensures that the water level is in a normal range. The water quality condition of the water collecting well of the hydropower station is bad, the water level sensor is easy to deviate, the water level measurement is error, and the normal operation of the drainage system is affected.
When the water level sensor is deviated, the water level control is usually inaccurate, even the water level is overflowed from a water collecting well or the water pump is in dry pumping, so that the current of the water pump is excessively damaged, maintenance personnel need to constantly patrol the water level of the water collecting well and compare the water level with the displayed water level, if the water level is out of tolerance with the actual error, sensor correction is also needed, the water level of the water collecting well needs to be manually pumped below the reference water level during correction, then a current calibration instrument is connected into a water level measuring loop in series, the deviation of the water level sensor is set through a debugging notebook, and normal operation can be put into after the setting. The tuning process is cumbersome and the error of the sensor cannot be checked and treated in time.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hydropower station water level measurement self-adaptive fault diagnosis correction system and a hydropower station water level measurement self-adaptive fault diagnosis correction method, which can automatically detect detection values of two sensors through a controller, judge whether the sensors have faults, provide fault alarms and correct the accuracy of out-of-tolerance sensors.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a hydropower station water level measurement self-adaptation fault diagnosis correction system, includes sump pit, first liquid level sensor and second liquid level sensor, and first liquid level sensor and second liquid level sensor are located the sump pit bottom and the vertical position of installation is the same, are equipped with benchmark liquid level float switch in the sump pit, and the suction pipe of suction pump stretches into the sump pit bottom, and first liquid level sensor, second liquid level sensor, suction pump and benchmark liquid level float switch are connected with the switch board electricity;
the liquid level detection signals of the first liquid level sensor and the second liquid level sensor are collected through the control cabinet and compared with preset values, whether the liquid level values of the first liquid level sensor and the second liquid level sensor are accurate or not and whether faults occur or not is judged, and the two liquid level sensors are corrected after the liquid level in the water collecting well is pumped to the reference liquid level through the water suction pump.
The controller is arranged in the control cabinet, the controller is provided with a digital quantity end and an analog quantity end, the input end of the digital quantity end is electrically connected with the reference liquid level float switch, the output end of the digital quantity end is electrically connected with the water suction pump contactor, and the analog quantity end is electrically connected with the first liquid level sensor and the second liquid level sensor.
The first liquid level sensor and the second liquid level sensor are provided with transmitters, and the transmitters are electrically connected with the analog end of the controller.
The first liquid level sensor and the second liquid level sensor are pressure type liquid level sensors.
The switch reference liquid level set on the reference liquid level float switch is adjustable, and the vertical triggering position of the switch reference liquid level is lower than the heights of the first liquid level sensor and the second liquid level sensor.
The diagnosis and correction method for the hydropower station water level measurement self-adaptive fault diagnosis and correction system comprises the following specific steps:
step one, a controller collects the digital quantity of the current liquid level value detected by a first liquid level sensor and a second liquid level sensor sent by a transmitter, compares the digital quantity with a corresponding value L0 of a liquid level range minimum value and a corresponding value L1 of a liquid level range maximum value, if the current digital quantity is detected not to be between L0 and L1, the sensor fails, the controller corresponds to an alarm signal of the sensor failure, and if the current digital quantity of the two sensors is detected to be between L0 and L1, the step two is entered;
step two, the controller firstly detects the liquid level value x of the current period of the first liquid level sensor and the second liquid level sensor by taking the time t as the basic unit of the detection period t And y t Then the liquid level values of the current periods of the two sensors are collected again at intervals of time t until reaching the liquid level number x after the set n time periods nt And y nt And collect the n periodic liquid level values and the first periodic liquid level value x of two sensors t And y t Checking the difference, if the water level x t -water level x jt If the value of =0, j=1, 2,3 … n is satisfied, the controller outputs an alarm signal of the first liquid level sensor failure, if the water level y is t -water level y jt When =0, j=1, 2,3 … n is true, the controller outputsIf the two difference formulas are not established, entering a step III;
detecting that the current liquid level values of the first liquid level sensor and the second liquid level sensor are respectively the water level 1 and the water level 2, wherein H1 is the difference of the liquid level values of the two preset sensors, if the water level 1-water level 2< H1 is established, the liquid level difference values of the two sensors are not out of tolerance, the liquid level detection is normal, and if the water level 1-water level 2 is greater than or equal to H1, the liquid level difference values of the two sensors are out of tolerance, and entering a step four;
step four, the controller starts the water pump to start pumping, and when the liquid level is reduced to the reference liquid level set on the reference liquid level float switch, the switch is triggered to stop pumping;
step five, the controller collects zero current of two sensors when the liquid level is at a reference value, calculates current value offset, compares the absolute value of the current value offset of the two sensors with a set current offset value I0, if the absolute value of the current value offset is greater than the set current offset value I0, the corresponding sensor fails, the controller outputs an alarm signal corresponding to the sensor fails, and if the absolute value of the current value offset of the two sensors is less than or equal to the set current offset value I0, the step six is entered;
step six, correcting the sensors, and calculating the water level value offset of the two sensors, wherein the calculation formula is as follows:
water level value offset= (liquid level range/current range) x current value offset
And then adding the water level value offset to the water level value currently detected by the corresponding sensor to obtain a corrected liquid level value.
The invention provides a hydropower station water level measurement self-adaptive fault diagnosis correction system and a hydropower station water level measurement self-adaptive fault diagnosis correction method, which are characterized in that a controller is used for detecting the numerical values of two water level sensors at the bottom of a water collecting well to preliminarily judge whether the sensors generate faults, then comparing the indication difference values of the two sensors, determining whether to carry out adjustment correction or not according to whether the difference values are out of tolerance, and determining the liquid level numerical value adjustment quantity according to the current value when the water collecting well liquid level is reduced to a reference value and the reference liquid levels of the two sensors are detected, so that automatic detection, fault warning and automatic correction can be realized, and personnel inspection and manual correction are omitted.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a block diagram of an arrangement of a fault diagnosis and correction system of the present invention;
FIG. 2 is an electrical connection diagram of the present invention;
FIG. 3 is a flow chart of diagnostic calibration for a level sensor with a current range of 4-20 mA.
Wherein: the device comprises a first liquid level sensor 1, a second liquid level sensor 2, a water suction pump 3, a reference liquid level float switch 4, a transmitter 5, a control cabinet 6, a controller 7, a water suction pump contactor 8 and a water collection well 9.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings and the embodiment, wherein the controller is Siemens S7-300 type PLC, and the current range of the sensor is 4-20 mA:
as shown in fig. 1-3, the self-adaptive fault diagnosis and correction system for hydropower station water level measurement comprises a water collecting well 9, a first liquid level sensor 1 and a second liquid level sensor 2, wherein the first liquid level sensor 1 and the second liquid level sensor 2 are positioned at the bottom of the water collecting well 9, the vertical positions of installation are the same, a reference liquid level float switch 4 is arranged in the water collecting well 9, a water suction pipe of a water suction pump 3 stretches into the bottom of the water collecting well 9, and the first liquid level sensor 1, the second liquid level sensor 2, the water suction pump 3 and the reference liquid level float switch 4 are electrically connected with a control cabinet 6;
the liquid level detection signals of the first liquid level sensor 1 and the second liquid level sensor 2 are collected through the control cabinet 6 and compared with preset values, whether the liquid level values of the first liquid level sensor 1 and the second liquid level sensor 2 are accurate or not and whether faults occur or not is judged, and the two liquid level sensors are corrected after the liquid level in the water collecting well 9 is pumped to the reference liquid level through the water suction pump 3.
As shown in fig. 2, the controller 7 is disposed in the control cabinet 6, the controller 7 is provided with a digital end and an analog end, the input end of the digital end is electrically connected with the reference liquid level float switch 4, the output end of the digital end is electrically connected with the water suction pump contactor 8, and the analog end is electrically connected with the first liquid level sensor 1 and the second liquid level sensor 2. The first liquid level sensor 1 and the second liquid level sensor 2 are provided with the transmitter 5, the transmitter 5 is electrically connected with the analog end of the controller 7, and the Siemens S7-300 type PLC is used for calculating the current liquid level through a built-in program by detecting a current signal at the side of the transmitter 5 and converting the current value into a numerical value.
The first liquid level sensor 1 and the second liquid level sensor 2 are pressure type liquid level sensors, the pressure type liquid level sensors are used for sensing liquid level values by detecting water pressure to transmit current values, and the sensors are small in size, convenient to install and high in accuracy.
The switch reference liquid level that above-mentioned reference liquid level float switch 4 was last to set up is adjustable, switch reference liquid level triggers the vertical position and is less than first liquid level sensor 1 and second liquid level sensor 2 high, can guarantee that the sensor is unsettled when the sump pit 9 is at the reference liquid level, the sensor registration should be in minimum, conveniently correct, reference liquid level value on the reference liquid level float switch 4 can be adjusted, the reference liquid level when deciding the trigger through the switch position in the regulation pipe, when the liquid level sensor is first installed, first through measuring the switch position fixed in the reference liquid level float switch 4, then adjust the sump pit internal water level to just trigger the switch, detect the current value of liquid level sensor and be minimum at this moment, when the electric current is not minimum at this moment, should change the sensor.
The diagnosis and correction method for the hydropower station water level measurement self-adaptive fault diagnosis and correction system comprises the following specific steps:
step one, a controller 7 collects the digital quantity of the current liquid level value detected by the first liquid level sensor 1 and the second liquid level sensor 2 sent by the transmitter 5, compares the digital quantity with a corresponding value L0 of the liquid level range minimum value and a corresponding value L1 of the liquid level range maximum value, if the current digital quantity is detected to be not between L0 and L1, the sensor fails, the controller 7 corresponds to an alarm signal of the sensor fails, and if the current digital quantity of the two sensors is detected to be between L0 and L1, the step two is entered;
step two, the controller 7 firstly detects the liquid level value x of the current period of the first liquid level sensor 1 and the second liquid level sensor 2 by taking the time t as the basic unit of the detection period t And y t Then the liquid level values of the current periods of the two sensors are collected again at intervals of time t until reaching the liquid level number x after the set n time periods nt And y nt And collect the n periodic liquid level values and the first periodic liquid level value x of two sensors t And y t Checking the difference, if the water level x t -water level x jt When =0, j=1, 2,3 … n is satisfied, the controller 7 outputs an alarm signal of the failure of the first liquid level sensor 1, and if the water level y t -water level y jt If the two difference formulas are not established, the step three is entered;
step three, the controller 7 detects that the current liquid level values of the first liquid level sensor 1 and the second liquid level sensor 2 are respectively the water level 1 and the water level 2, H1 is the difference of the liquid level values of the two preset sensors, if the water level 1-water level 2< H1 is met, the liquid level difference values of the two sensors are not out of tolerance, the liquid level detection is normal, if the water level 1-water level 2 is more than or equal to H1 is met, the liquid level difference values of the two sensors are out of tolerance, and the step four is entered;
step four, the controller 7 starts the water pump 3 to start pumping, and when the liquid level is reduced to the reference liquid level set on the reference liquid level float switch 4, the switch is triggered, and the pumping is stopped;
step five, the controller 7 collects zero current of two sensors when the liquid level is at a reference value, calculates a current value offset, wherein the current value offset=sensor reference liquid level current-reference liquid level current I, the analog quantity current range of Siemens S7-300 type PLC is 4-20mA, the reference liquid level current I is 4mA, the absolute value of the current value offset of the two sensors is compared with a set current offset value I0, if the absolute value of the current value offset is greater than the set current offset value I0, the corresponding sensor fails, the controller 7 outputs an alarm signal corresponding to the sensor failure, and if the absolute value of the current value offset of the two sensors is less than or equal to the set current offset value I0, the step six is entered;
step six, correcting the sensors, and calculating the water level value offset of the two sensors, wherein the calculation formula is as follows:
water level value offset = liquid level range/current range x current value offset
Here, the current range=20 mA-4 ma=16 mA, and the liquid level range=hmax-Hmin is the maximum liquid level value which can be measured by the liquid level sensor;
and then adding the water level value offset to the water level value currently detected by the corresponding sensor to obtain a corrected liquid level value.
The invention detects faults of the sensors for many times through the controller, determines whether to correct by detecting whether the difference value of the two sensors exceeds the tolerance, calculates the point flow of the sensors by reducing the water level of the water collecting well to the reference water level during correction, calculates the liquid level offset value, and adds the value to the final indication of the corresponding sensors, so that the correction is more accurate.
The hardware fault probability of the components of the liquid level sensor is low, most faults are slightly offset in analog quantity, the self-adaptive fault diagnosis technology for the water level measurement of the hydropower station can immediately judge the fault type and automatically perform fault diagnosis, the workload of maintenance personnel is greatly reduced, and the self-adaptive fault diagnosis technology can be popularized to the diagnosis system of the related water level measurement system.
Claims (1)
1. The diagnosis and correction method of the self-adaptive fault diagnosis and correction system for hydropower station water level measurement comprises a water collecting well (9), a first liquid level sensor (1) and a second liquid level sensor (2), and is characterized in that the first liquid level sensor (1) and the second liquid level sensor (2) are positioned at the bottom of the water collecting well (9) and are arranged at the same vertical position, a reference liquid level float switch (4) is arranged in the water collecting well (9), a water suction pipe of a water suction pump (3) stretches into the bottom of the water collecting well (9), and the first liquid level sensor (1), the second liquid level sensor (2), the water suction pump (3) and the reference liquid level float switch (4) are electrically connected with a control cabinet (6);
the liquid level detection signals of the first liquid level sensor (1) and the second liquid level sensor (2) are collected through a control cabinet (6) and compared with preset values, whether the liquid level values of the first liquid level sensor (1) and the second liquid level sensor (2) are accurate or not and whether faults occur or not is judged, and the liquid level in the water collecting well (9) is pumped to a reference liquid level through a water suction pump (3) and then the two liquid level sensors are corrected;
a controller (7) is arranged in the control cabinet (6), the controller (7) is provided with a digital quantity end and an analog quantity end, the input end of the digital quantity end is electrically connected with the reference liquid level float switch (4), the output end of the digital quantity end is electrically connected with the water suction pump contactor (8), and the analog quantity end is electrically connected with the first liquid level sensor (1) and the second liquid level sensor (2);
the first liquid level sensor (1) and the second liquid level sensor (2) are provided with transmitters (5), and the transmitters (5) are electrically connected with the analog end of the controller (7);
the first liquid level sensor (1) and the second liquid level sensor (2) are pressure type liquid level sensors;
the switch reference liquid level set on the reference liquid level float switch (4) is adjustable, and the vertical triggering position of the switch reference liquid level is lower than the heights of the first liquid level sensor (1) and the second liquid level sensor (2);
the specific steps of diagnosis and correction are as follows:
step one, a controller (7) collects the digital quantity of the current liquid level value detected by a first liquid level sensor (1) and a second liquid level sensor (2) sent by a transmitter (5), compares the digital quantity with a corresponding value L0 of the liquid level range minimum value and a corresponding value L1 of the liquid level range maximum value, if the current digital quantity is detected to be not between L0 and L1, the sensor fails, the controller (7) corresponds to an alarm signal of the sensor failure, and if the current digital quantity of the two sensors is detected to be between L0 and L1, the step two is entered;
step two, the controller (7) firstly detects the liquid level value x of the current period of the first liquid level sensor (1) and the second liquid level sensor (2) by taking the time t as the basic unit of the detection period t And y t Then the liquid level values of the current periods of the two sensors are collected again at intervals of time t until reaching the liquid level number x after the set n time periods nt And y nt And collectTwo sensors n periodic liquid level values and a first periodic liquid level value x t And y t Checking the difference, if the water level x t -water level x jt When =0, j=1, 2,3 … n is satisfied, the controller (7) outputs an alarm signal of the failure of the first liquid level sensor (1), and if the water level y t -water level y jt If the two difference formulas are not established, the controller (7) enters a step III;
detecting that the current liquid level values of the first liquid level sensor (1) and the second liquid level sensor (2) are respectively a water level 1 and a water level 2, wherein H1 is the difference of the liquid level values of the two preset sensors, if the water level 1-water level 2< H1 is met, the liquid level difference values of the two sensors are not out of tolerance, the liquid level detection is normal, and if the water level 1-water level 2 is more than or equal to H1, the liquid level difference values of the two sensors are out of tolerance, and entering a step four;
step four, the controller (7) starts the water suction pump (3) to start pumping, and when the liquid level is reduced to the reference liquid level set on the reference liquid level float switch (4), the switch is triggered, and the water suction is stopped;
step five, the controller (7) collects zero current of two sensors when the liquid level is at a reference value, calculates current value offset, compares the absolute value of the current value offset of the two sensors with a set current offset value I0, if the absolute value of the current value offset is greater than the set current offset value I0, the corresponding sensor fails, the controller (7) outputs an alarm signal corresponding to the sensor fails, and if the absolute value of the current value offset of the two sensors is less than or equal to the set current offset value I0, the step six is entered;
step six, correcting the sensors, and calculating the water level value offset of the two sensors, wherein the calculation formula is as follows:
water level value offset= (liquid level range/current range) x current value offset
And then adding the water level value offset to the water level value currently detected by the corresponding sensor to obtain a corrected liquid level value.
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| CN114018360A (en) * | 2021-11-08 | 2022-02-08 | 兖州煤业股份有限公司 | Water level monitoring method and water level monitoring system |
| CN114460910A (en) * | 2021-12-31 | 2022-05-10 | 浙江中控技术股份有限公司 | DCS-based analog quantity change judgment method, DCS-based analog quantity change judgment equipment and storage medium |
| CN116295729B (en) * | 2022-12-27 | 2024-03-12 | 中国长江电力股份有限公司 | Active calculation method for water inflow of underground factory building water collecting well |
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