CN113029305A - Self-adaptive fault diagnosis and correction system and method for hydropower station water level measurement - Google Patents
Self-adaptive fault diagnosis and correction system and method for hydropower station water level measurement Download PDFInfo
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- CN113029305A CN113029305A CN202110320614.8A CN202110320614A CN113029305A CN 113029305 A CN113029305 A CN 113029305A CN 202110320614 A CN202110320614 A CN 202110320614A CN 113029305 A CN113029305 A CN 113029305A
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- 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
A hydropower station water level measurement self-adaptive fault diagnosis and correction system and a method thereof comprise a water collecting well, a first liquid level sensor and a second liquid level sensor, wherein the first liquid level sensor and the second liquid level sensor are positioned at the bottom of the water collecting well and are installed at the same vertical position; whether the sensor produces the trouble through the numerical value preliminary judgement sensor of controller detection two level sensor in the sump pit bottom, then through the registration difference value of two sensors of contrast, whether adjust the correction through the difference value surpassing, through falling the sump pit liquid level to the benchmark value, the current value when detecting the benchmark liquid level of two sensors determines liquid level numerical value adjustment volume, can accomplish automatic detection, the trouble is reported an emergency and asked for help or increased vigilance and automatic correction, saved personnel and patrolled and artificially corrected.
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 water level value of the water collecting well, so that the water level is ensured to be within a normal range. The water quality condition of a water collecting well of a hydropower station is severe, so that the water level sensor is easy to deviate, the water level measurement is easy to have errors, and the normal operation of a drainage system is influenced.
When the water level sensor deviates, the water level control is inaccurate, even the water level overflows the water collecting well or the water pump is in dry pumping, so that the current of the water pump is excessively damaged, therefore, maintenance personnel need to frequently inspect 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, the sensor needs to be corrected, when the correction is carried out, the water level of the water collecting well needs to be manually pumped to be below the reference water level, then the current check instrument is connected in a water level measuring loop in series, then the offset of the water level sensor is set by a test notebook, and the normal operation can be carried out after the setting. The setting process is complicated, and the error of the sensor cannot be checked 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 and correction system and a method, which can automatically detect the detection values of two sensors through a controller, judge whether the sensors have faults or not, provide fault alarm and perform precision correction on the out-of-tolerance sensors.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a hydropower station water level measurement self-adaptive fault diagnosis and correction system comprises a water collecting well, a first liquid level sensor and a second liquid level sensor, wherein the first liquid level sensor and the second liquid level sensor are positioned at the bottom of the water collecting well and are installed at the same vertical position;
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 a preset value, whether the liquid level values of the first liquid level sensor and the second liquid level sensor are accurate or not and whether a fault occurs or not are judged, and the liquid level in the water collecting well is pumped to a reference liquid level through the water suction pump and then is corrected by the two liquid level sensors.
The controller is arranged in the control cabinet and 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 quantity 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 position triggered by the switch reference liquid level is lower than the elevations of the first liquid level sensor and the second liquid level sensor.
The diagnosis and correction method using the hydropower station water level measurement self-adaptive fault diagnosis and correction system comprises the following specific steps:
step one, the controller collects current liquid level value digital quantities detected by a first liquid level sensor and a second liquid level sensor sent by a transmitter, and compares the digital quantities with a value L0 corresponding to the minimum liquid level range value and a value L1 corresponding to the maximum liquid level range value, if the current digital quantities are detected to be not in L0 and L1, the sensors are in fault, the controller corresponds to alarm signals of the sensor fault, and if the current digital quantities of the two sensors are detected to be between L0 and L1, the step two is carried out;
secondly, the controller detects the liquid level values t and t of the first liquid level sensor and the second liquid level sensor in the current period by taking the time t as a basic unit of a detection period, then acquires the liquid level values of the two sensors in the current period again at intervals of a time period t until reaching the liquid level numbers 1nt and 2nt after n set time periods, and checks the difference between the acquired liquid level values of the two sensors in n periods and the liquid level values of the first period, wherein if the water level 1 t-the water level 1jt =0, j =1,2,3 … n is established, the controller outputs an alarm signal of the fault of the first liquid level sensor, if the water level 2 t-the water level 2jt, j =1,2,3 … n is established, the controller outputs an alarm signal of the fault of the second liquid level sensor, and if two difference formulas are checked to be not established, entering a third step;
step three, detecting that the liquid level numerical values of the first liquid level sensor and the second liquid level sensor are respectively water level 1 and water level 2 by the controller, wherein H1 is the preset liquid level numerical difference of the two sensors, if the water level 1-water level 2 is less than H1, the liquid level difference value of the two sensors is 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 value of the two sensors is out of tolerance, and entering step four;
fourthly, the controller starts a water suction pump to start pumping water, and when the liquid level is reduced to a reference liquid level set on a reference liquid level float switch, the switch is triggered to stop pumping water;
step five, the controller collects zero point currents of the two sensors when the liquid level is at a reference value, calculates current value offset, wherein the current value offset is = sensor reference liquid level current-reference liquid level current I, compares absolute values of the current value offsets 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, corresponding sensor faults occur, the controller outputs an alarm signal corresponding to the sensor faults, and if the absolute values of the current value offsets of the two sensors are smaller than or equal to the set current offset value I0, the controller enters step six;
step six, correcting the sensors, and calculating the offset of the water level values of the two sensors, wherein the calculation formula is as follows:
offset of water level value = (liquid level range/current range) × offset of current value
And then adding the offset of the water level value and the water level value currently detected by the corresponding sensor to obtain a corrected liquid level numerical value.
The invention provides a hydropower station water level measurement self-adaptive fault diagnosis and correction system and a method, which preliminarily judge whether a sensor has a fault or not by detecting the numerical values of two water level sensors at the bottom of a water collecting well through a controller, then determine whether to adjust and correct or not by comparing the numerical indication difference values of the two sensors and determining whether to adjust and correct or not through determining whether the difference values are out of tolerance, and determine the adjustment amount of the numerical value of the liquid level by reducing the liquid level of the water collecting well to a reference value and detecting the current value of the reference liquid levels of the two sensors, thereby realizing automatic detection, fault alarm and automatic correction and saving the patrol and manual correction of personnel.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a block diagram of the layout of the 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 the diagnostic calibration for a 4-20mA current span of the level sensor.
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 collecting well 9.
Detailed Description
The technical scheme of the invention is explained in detail by combining the drawings and the embodiment, the controller is a Siemens S7-300 type PLC, and the current measuring range of the sensor is 4-20 mA:
as shown in fig. 1-3, a hydropower station water level measurement self-adaptive fault diagnosis and correction system 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 and are installed at the same vertical position, a reference liquid level float switch 4 is arranged in the water collecting well 9, a water pumping pipe of a water pumping pump 3 extends into the bottom of the water collecting well 9, and the first liquid level sensor 1, the second liquid level sensor 2, the water pumping pump 3 and the reference liquid level float switch 4 are electrically connected with a control cabinet 6;
collect first level sensor 1 and second level sensor 2's liquid level detection signal and compare with the value of predetermineeing through switch board 6, judge whether accurate and whether break down of first level sensor 1 and second level sensor 2 liquid level value to take out to the benchmark liquid level through suction pump 3 in with sump pit 9 after to two level sensor rectify.
As shown in fig. 2, 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, an input end of the digital quantity end is electrically connected with the reference liquid level float switch 4, an output end of the digital quantity end is electrically connected with the water 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, the transmitters 5 are electrically connected with analog quantity ends of the controller 7, and the Siemens S7-300 type PLC detects current signals on the transmitter 5 side, converts current values into numerical values and calculates the current liquid level through a built-in program.
Foretell first level sensor 1 and second level sensor 2 are pressure type level sensor, and pressure type level sensor comes the transmission to become the current value through detecting water pressure and responds to the liquid level value, and its sensor small in size is convenient for install and the precision is higher.
The switch reference liquid level that sets for on foretell benchmark liquid level float switch 4 is adjustable, switch reference liquid level triggers vertical position and is less than first level sensor 1 and the 2 elevations of second level sensor, can guarantee that sump pit 9 sensor is unsettled when the reference water level, the sensor registration should be in the minimum, conveniently rectify, the reference level value on the benchmark liquid level float switch 4 can be adjusted, decide the reference water level when triggering through the switch position in the regulation pipe, when level sensor installs for the first time, earlier through measuring the switch position fixed in with benchmark liquid level float switch 4, then adjust the water level in the sump pit to just triggering the switch, detect whether level sensor's current value is the minimum this moment, when the current is not the minimum this moment, should change the sensor.
The diagnosis and correction method using the hydropower station water level measurement self-adaptive fault diagnosis and correction system comprises the following specific steps:
step one, the controller 7 collects digital quantities of current liquid level values detected by the first liquid level sensor 1 and the second liquid level sensor 2 sent by the transmitter 5, and compares the digital quantities with a value L0 corresponding to the minimum value of a liquid level range and a value L1 corresponding to the maximum value of the liquid level range, if the current digital quantities are detected to be not in L0 and L1, the sensors are in fault, the controller 7 corresponds to an alarm signal of the sensor fault, and if the current digital quantities of the two sensors are detected to be between L0 and L1, the step two is entered;
step two, the controller 7 firstly detects the liquid level values 1t and 2t of the first liquid level sensor 1 and the second liquid level sensor 2 in the current period by taking the time t as a basic unit of the detection period, then collects the liquid level values of the two sensors in the current period again at intervals of a time period t until reaching the liquid level numbers 1nt and 2nt after n set time periods, and checks the difference between the collected n period liquid level values of the two sensors and the liquid level values 1t and 2t in the first period, if the water level 1 t-the water level 1jt =0, j =1,2,3 … n is established, the controller 7 outputs the alarm signal of the first liquid level sensor 1 fault, if the water level 2 t-the water level 2jt, j =1,2,3 … n is established, the controller 7 outputs the alarm signal of the second liquid level sensor 2 fault, if the two difference formulas are checked to be not established, entering a third step;
step three, detecting that the current liquid level values of the first liquid level sensor 1 and the second liquid level sensor 2 are respectively water level 1 and water level 2 by the controller 7, wherein H1 is the preset liquid level value difference of the two sensors, if the water level 1-the water level 2< H1, the liquid level difference value of the two sensors is not out of tolerance, the liquid level detection is normal, and if the water level 1-the water level 2 is more than or equal to H1, the liquid level difference value of the two sensors is out of tolerance, and entering step four;
step four, the controller 7 starts the water pump 3 to pump water, and triggers the switch to stop pumping water when the liquid level is reduced to the reference liquid level set on the reference liquid level float switch 4;
step five, the controller 7 collects zero point currents of the two sensors when the liquid level is at a reference value, calculates a 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 larger than the set current offset value I0, the corresponding sensor fails, outputs an alarm signal corresponding to the sensor failure if the absolute value of the current value offset of the two sensors is smaller than or equal to the set current offset value I0, and enters step six;
step six, correcting the sensors, and calculating the offset of the water level values of the two sensors, wherein the calculation formula is as follows:
water level value offset = liquid level range/current range × current value offset
The current range =20mA-4mA =16mA, the liquid level range = Hmax-Hmin, and the maximum liquid level value can be measured by the liquid level sensor;
and then adding the offset of the water level value and the water level value currently detected by the corresponding sensor to obtain a corrected liquid level numerical value.
The invention detects the fault of the sensor for many times through the controller, determines whether to correct by detecting whether the difference value of the two sensors is out of tolerance, calculates the point flow of the sensor by reducing the water level of the water collecting well to the datum water level during correction, then calculates the liquid level deviation value, and adds the value to the final reading of the corresponding sensor, so that the sensor is more accurate.
The probability of hardware faults of components of the liquid level sensor is low, most of the faults are slight analog deviation, the self-adaptive fault diagnosis technology for measuring the water level of the hydropower station can immediately judge the fault type and automatically diagnose the faults, the workload of maintenance personnel is greatly reduced, and the self-adaptive fault diagnosis technology for measuring the water level of the hydropower station can be popularized to diagnosis systems of related water level measurement systems for use.
Claims (6)
1. A hydropower station water level measurement self-adaptive fault diagnosis and correction system 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 installed 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) extends 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 a preset value, 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 a fault occurs or not is judged, and the liquid level in the water collecting well (9) is pumped to a reference liquid level through the water suction pump (3) and then is corrected by the two liquid level sensors.
2. The adaptive fault diagnosis and correction system for the hydropower station water level measurement according to claim 1, wherein 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).
3. The adaptive fault diagnosis and correction system for hydropower station water level measurement according to claim 2, wherein 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 an analog quantity end of the controller (7).
4. The adaptive fault diagnosis and correction system for water level measurement of hydropower stations according to claim 3, wherein the first liquid level sensor (1) and the second liquid level sensor (2) are pressure type liquid level sensors.
5. The adaptive fault diagnosis and correction system for the water level measurement of the hydropower station according to claim 4, wherein the switch reference level set on the reference level float switch (4) is adjustable, and the switch reference level triggers that the vertical position is lower than the elevations of the first liquid level sensor (1) and the second liquid level sensor (2).
6. The diagnosis and correction method using the adaptive fault diagnosis and correction system for hydropower station water level measurement according to claim 5 is characterized by comprising the following specific steps of:
step one, the controller (7) collects current liquid level value digital quantities detected by the first liquid level sensor (1) and the second liquid level sensor (2) and sent by the transmitter (5), and compares the current liquid level value digital quantities with a value L0 corresponding to the minimum liquid level range value and a value L1 corresponding to the maximum liquid level range value, if the current digital quantities are detected to be not in L0 and L1, the sensors are in fault, the controller (7) corresponds to an alarm signal of the sensor fault, and if the current digital quantities of the two sensors are detected to be between L0 and L1, the step two is carried out;
secondly, the controller (7) detects the liquid level values 1t and 2t of the first liquid level sensor (1) and the second liquid level sensor (2) in the current period by taking the time t as a basic unit of the detection period, then collects the liquid level values of the two sensors in the current period again at intervals of a time period t until reaching the liquid level numbers 1nt and 2nt after n set time periods, checks the difference between the collected n periods of the liquid level values of the two sensors and the first period of the liquid level values 1t and 2t, and outputs a fault alarm signal of the first liquid level sensor (1) if the water level 1 t-the water level 1jt =0, j =1,2,3 … n is true, and outputs a fault alarm signal of the second liquid level sensor (2) if the water level 2 t-the water level 2jt, j =1,2,3 … n is true, if the two difference formulas are not checked to be satisfied, entering a third step;
step three, detecting that the current liquid level values of the first liquid level sensor (1) and the second liquid level sensor (2) are respectively water level 1 and water level 2 by the controller (7), wherein H1 is the preset liquid level value difference of the two sensors, if the water level 1-the water level 2< H1, the liquid level difference value of the two sensors is not out of tolerance, the liquid level detection is normal, and if the water level 1-the water level 2 is more than or equal to H1, the liquid level difference value of the two sensors is out of tolerance, and entering step four;
step four, the controller (7) starts the water suction pump (3) to start water suction, 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 to stop water suction;
step five, the controller (7) collects zero point currents of the two sensors when the liquid level is at a reference value, calculates current value offset, the current value offset = sensor reference liquid level current-reference liquid level current I, compares absolute values of the current value offsets 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, corresponding sensor faults occur, the controller (7) outputs alarm signals corresponding to the sensor faults, and if the absolute values of the current value offsets of the two sensors are smaller than or equal to the set current offset value I0, the step six is carried out;
step six, correcting the sensors, and calculating the offset of the water level values of the two sensors, wherein the calculation formula is as follows:
offset of water level value = (liquid level range/current range) × offset of current value
And then adding the offset of the water level value and the water level value currently detected by the corresponding sensor to obtain a corrected liquid level numerical value.
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| CN113460520A (en) * | 2021-08-20 | 2021-10-01 | 河南中烟工业有限责任公司 | Liquid level detection emergency device for storage tank of cut stem charging machine |
| 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 |
| CN116295729A (en) * | 2022-12-27 | 2023-06-23 | 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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