CN114427511B - Hydropower unit power feedback and main connection feedback signal fault collaborative judgment method - Google Patents
Hydropower unit power feedback and main connection feedback signal fault collaborative judgment method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/008—Measuring or testing arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The method for cooperatively judging the power feedback and main connection feedback signal faults of the hydroelectric generating set comprises the steps of comparing and mutually comparing a follow-up actual main servomotor displacement feedback difference value and a power feedback difference value with a standard value when a response given value and a deviation value exceed set values according to the fact that the fault condition is power feedback abnormality or main connection displacement feedback abnormality, so as to judge whether corresponding faults occur. The method for cooperatively judging the faults of the two signals fills the blank of judging the abnormal constant fault-free faults of the sensor signals and provides a reference method for judging the faults of similar signals.
Description
Technical Field
The invention relates to the field of failure detection of a hydroelectric generating set, in particular to a method for cooperatively judging power feedback and main connection feedback signal failures of a hydroelectric generating set.
Background
The power feedback and the main connection displacement are directly related to the stable and reliable operation of the water turbine unit. Under the prior art, the power feedback and the main connection feedback are generally converted into 4-20mA current through a power transmitter and a displacement transmitter respectively, and enter the acquisition module through an analog quantity channel, as shown in fig. 1. Both signals can be collected independently on the speed regulator side or the monitoring LCU side, and can also be collected simultaneously on both sides, but the signal sources are required to be kept uniform.
The two signal faults are generally judged by adopting a conventional analog signal judgment method, including signal out-of-limit, signal jump and the like, and the cooperative judgment of the two signals is not considered. Once the power transmitter is halted, a certain value of the sensor output current between 4 mA and 20mA is constant (signal is abnormally constant for short) caused by separation of the sensor guide plate due to falling of a fastening bolt of a connecting hole of a displacement sensor, breakage of a connecting rod and the like, the conventional judging method cannot judge, namely the signal is normally judged, and serious consequences can be generated: when the power transmitter is halted, if the constant value is smaller than the actual active value of the unit, serious overload of the unit is caused; if the constant value is greater than the actual active value of the unit, the unit is caused to run with reverse power. If the connecting rod of the main connection displacement sensor and the sensor guide plate fall off, the opening swing and load oscillation of the unit are caused, and even the operation of a power grid is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hydropower unit power feedback and main connection feedback signal fault collaborative judgment method, which is based on the existing signal fault judgment method, adds two signal association analysis and collaborative judgment methods, and solves the abnormal conditions of unit overload, reverse power, large load fluctuation and the like caused by constant single signal output value. The method can be performed in speed regulator control, monitoring LCU control, and simultaneously on both sides for further redundancy.
In order to solve the technical problems, the invention adopts the following technical scheme:
the method for cooperatively judging the power feedback and main connection feedback signal faults of the hydroelectric generating set comprises the following steps:
the first fault condition is that the primary connection displacement feedback signal is normal, and the power feedback signal fault collaborative judgment is carried out when the power feedback is abnormal;
the second fault condition is that the power feedback signal is normal, and the main joint feedback signal fault is cooperatively judged when the main joint displacement feedback is abnormal;
when the first fault condition is subjected to fault cooperative judgment, calculating the opening difference value of the subsequent main servomotor and the power variation amplitude value to compare and judge whether a power feedback fault occurs or not after the deviation between the power setting and the power feedback reaches a set value;
and when the second fault condition is subjected to fault cooperative judgment, calculating the opening difference value of the subsequent main servomotor and the power variation amplitude value to compare and judge whether the main servomotor feedback fault occurs or not after the feedback deviation between the given main servomotor and the main servomotor reaches a set value.
The specific judging method of the first fault condition is as follows:
condition 1: the speed regulator is in a grid-connected state, is remote and automatic, and has normal main connection feedback and normal power giving channel;
condition 2: when the power is given by P Feeding of And power feedback P Feed-back The deviation reaches a set value delta P, and a main joint displacement feedback value Y1 and actual power P1 at the moment are recorded;
condition 3: subsequent main servomotor displacement feedback Y Feed-back Y1 is greater than the set value DeltaY 1, the amplitude of variation P of the power Feed-back -P1 is smaller than a set value Δp1;
and when all the three conditions are met, delaying for T1 seconds, and judging the power feedback fault.
The specific judging method of the second fault condition is as follows:
condition 1: the speed regulator is in a grid-connected state, is remote and automatic, and has normal power feedback signals and normal main connection given channels;
condition 2: when the main joint displacement is given by Y Feeding of With main joint displacement feedback Y Feed-back The deviation reaches a set value delta Y, the main joint displacement feedback value Y2 and the actual power P2 at the moment are recorded,
condition 3: subsequent actual power P Feed-back When P2 is larger than the set value DeltaP 2, the change amplitude Y of the main joint displacement feedback value Feed-back -Y2 is smaller than a set value Δy2;
and when all three conditions are met, delaying for T2 seconds, and judging the main joint displacement feedback fault.
The setting parameters delta P, delta Y, delta P1, delta P2, delta Y1 and delta Y2 are determined according to a water head-opening-power relation table and operation accumulation data of the unit, and the sizes of T1 and T2 are 2-5 seconds.
According to the method for cooperatively judging the power feedback and the main relay feedback signal faults of the hydroelectric generating set, whether the power feedback faults or the main relay feedback faults occur or not is judged according to comparison and comparison between the follow-up relay displacement feedback change value and the power change value and the set value under the condition that the deviation between the power feedback and the actual power is given or the deviation between the main relay displacement given and the main relay displacement feedback exceeds the set value, and the judgment on the cooperation of the main relay and the power feedback can be made.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of a hydroelectric generating set power feedback and main joint displacement feedback acquisition implementation;
FIG. 2 is a power feedback signal failure co-determination method of the present invention;
FIG. 3 is a schematic diagram of a method for collaborative determination of primary connection displacement feedback signal faults.
Detailed Description
The following describes the technical scheme of the invention in detail with reference to the drawings and the embodiments:
the specific implementation method can be divided into two types according to single signal faults:
1. power feedback signal fault collaborative determination method when main connection feedback signal is normal and power feedback is abnormal and constant
Condition 1: the speed regulator is in a grid-connected state, is remote and automatic, and has normal main connection feedback and normal power giving channel.
Condition 2: when the deviation between the power setting and the power feedback reaches a certain value delta P, recording the main connection displacement Y1 and the actual power P1 at the moment, and triggering the cooperative judgment enable EN1;
condition 3: when the real-time opening degree Y Feed-back When Y1 is greater than DeltaY, the power variation range P Feed-back -P1 is less than Δp;
results: after the above conditions are met, the time is delayed by T1 seconds, the power feedback fault is judged, and the judgment logic is shown in fig. 2.
2. Main joint feedback signal fault collaborative judging method for normal power feedback signal and abnormal main joint feedback timing
Condition 1: the speed regulator is in a grid-connected state, is remote and automatic, and has normal power feedback signals and normal main connection given channels;
condition 2: when the feedback deviation between the main connection given and the main connection reaches a certain value delta Y, recording the main connection displacement Y2 and the actual power P2 at the moment, and triggering the cooperative judgment enable EN2;
condition 3: when the real-time power P Feed-back When P2 is larger than DeltaP, the change amplitude Y of the main joint displacement Feed-back -Y2 is less than Δy;
results: after the above conditions are met, the delay is T2 seconds, the main connection displacement fault is judged, and the judgment logic is shown in figure 3.
In fig. 3, if a given signal is received, the determination method can be performed simultaneously on the side of the monitoring LCU and the side of the governor, and if not, the determination method can be performed only on the side of the governor.
The parameters (delta P, delta Y, delta P1, delta P2, delta Y1, delta Y2, T1 and T2) are different from one another for different units, the power and opening parameters are determined according to a water head-opening-power relation table and operation accumulation data of the units and are verified through experiments, and generally, the three parameters of delta P, delta P1 and delta P2 take the same values according to experiments and operation experience, and the setting range is 1% -2%; the three parameters of delta Y, delta Y1 and delta Y2 take the same values, and the setting range is 0.5% -1%; the T1 and T2 time parameters are generally set to 2-5 seconds.
Principle of determining two parameters of DeltaP and DeltaY:
1. and according to a water head-opening-power relation chart provided by a hydroelectric generating set model test, combining operation accumulation data, and respectively establishing a generating set water head-opening-power relation chart based on the water head in a speed regulator control program and a monitoring LCU control program. And establishing a plurality of relation tables by taking the lowest design water head as a lower limit and the highest design water head as an upper limit according to the water head operation probability.
Taking a certain power station unit as an example, the normal operation water head range is 106-163 m, the rated water head is 137 m, and the relation tables of the water head ranges of 106-127, 127-137, 137-147, 147-157, 157-163 and the like are respectively built. And determining opening-power relation tables of the water heads under 106 meters, 127 meters, 137 meters, 147 meters and 157 meters according to the design and operation accumulation data. The following table is a table of the opening-power relationship of the unit at 137 meters head. And establishing corresponding opening-power relation tables under other water heads according to the method. And writing the established table data into a program data storage area.
| Guide vane opening Y | 15％ | 25％ | 35％ | 45％ | 55％ | 65％ | 75％ |
| |
0％ | 100 | 240 | 400 | 600 | 710 | 840 |
| Remarks | No-load opening degree | / | / | / | / | / | / |
2. Two linear interpolation calculation function programs of Y_Interpol (P) and P_Interpol (Y) are written, and the logic of the current water head H selection opening-power meter is written, wherein the specific selection logic is as follows:
if (H > 157) selects a 157 meter lower opening-power relationship table;
else if (H > 147) selects a 147 meter lower opening-power relationship table;
else if (H > 137) selects a 137 meter lower opening-power relationship table;
else if (H > 127) selects a 127 meter lower opening-power relationship table;
else if (H > 106) selects a 106 meter lower opening-power relationship table;
taking the above unit as an example, when the current water head is 142 meters, a 137 meter lower opening degree-power relation table should be selected.
3. With current waterBased on the head, in the selected opening-power relation table, interpolation calculation is carried out by utilizing the two functions, and the actual power corresponding to the theoretical opening Y under the current head is respectively obtained Management device Theoretical power P corresponding to actual opening degree under current water head Management device 。
4. According to the result, the delta P and delta Y values are obtained, and the calculation formula is as follows:
△P＝|P feeding of -P Management device |
△Y＝|Y Feeding of -Y Management device |
△P＝△P1＝△P2
△Y＝△Y1＝△Y2
5. If the current head change causes a relationship table switch, the EN1, EN2 values need to be reset.
Namely en1=0, en2=0
By analyzing the internal relevance of the power and the main connection feedback, a method for cooperatively judging two signal faults is provided, the blank of abnormal constant fault-free judgment of the sensor signal is filled, and a reference method is provided for the fault judgment of similar signals.
Claims (2)
1. The method for cooperatively judging the power feedback and main connection feedback signal faults of the hydroelectric generating set is characterized in that the fault system judgment is divided into two fault conditions:
the first fault condition is that the primary connection displacement feedback signal is normal, and the power feedback signal fault collaborative judgment is carried out when the power feedback is abnormal;
the second fault condition is that the power feedback signal is normal, and the main joint feedback signal fault is cooperatively judged when the main joint displacement feedback is abnormal;
when the first fault condition is subjected to fault cooperative judgment, calculating the opening difference value of the subsequent main servomotor and the power variation amplitude value to compare and judge whether a power feedback fault occurs or not after the deviation between the power setting and the power feedback reaches a set value;
when the second fault condition is subjected to fault cooperative judgment, after the given feedback deviation of the main servomotor and the main servomotor reaches a set value, calculating the opening difference value of the subsequent main servomotor and the power variation amplitude value, and comparing and judging whether a main connection displacement feedback fault occurs or not;
the specific judging method of the first fault condition is as follows:
condition 1: the speed regulator is in a grid-connected state, is remote and automatic, and has normal main connection feedback and normal power giving channel;
condition 2: when the power is given by P Feeding of And power feedback P Feed-back The deviation reaches a set value delta P, and a main joint displacement feedback value Y1 and actual power P1 at the moment are recorded;
condition 3: subsequent main servomotor displacement feedback Y Feed-back Y1 is greater than the set value DeltaY 1, the amplitude of variation P of the power Feed-back -P1 is smaller than a set value Δp1;
when all three conditions are met, delaying for T1 seconds, and judging power feedback faults;
the specific judging method of the second fault condition is as follows:
condition 1: the speed regulator is in a grid-connected state, is remote and automatic, and has normal power feedback signals and normal main connection given channels;
condition 2: when the main joint displacement is given by Y Feeding of With main joint displacement feedback Y Feed-back The deviation reaches a set value delta Y, the main joint displacement feedback value Y2 and the actual power P2 at the moment are recorded,
condition 3: subsequent actual power P Feed-back When P2 is larger than the set value DeltaP 2, the change amplitude Y of the main joint displacement feedback value Feed-back -Y2 is smaller than a set value Δy2;
and when all three conditions are met, delaying for T2 seconds, and judging the main joint displacement feedback fault.
2. The method for collaborative determination of power feedback and primary feedback signal faults of a hydroelectric generating set according to claim 1, wherein the set values Δp, Δy, Δp1, Δp2, Δy1, Δy2 are determined according to a water head-opening-power relation table and operation accumulation data of the generating set, and the sizes of T1 and T2 are 2-5 seconds.
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| CN110206676A (en) * | 2019-05-27 | 2019-09-06 | 浙江大学 | The hydraulic turbine remotely monitors, diagnosis prediction and intelligent maintenance regulator control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7089154B2 (en) * | 2001-08-09 | 2006-08-08 | Rovsing Dynamics A/S | Automatic machinery fault diagnostic method and apparatus |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012197703A (en) * | 2011-03-18 | 2012-10-18 | Tokyo Electric Power Co Inc:The | Device and method for controlling monitoring of hydraulic turbine |
| CN203414278U (en) * | 2013-08-23 | 2014-01-29 | 中国水利水电科学研究院 | System for detecting abnormal condition of vibration of hydroelectric generating set in real time |
| CN104791187A (en) * | 2015-04-08 | 2015-07-22 | 武汉四创自动控制技术有限责任公司 | Water-turbine adjustment system and method capable of forecasting health status |
| CN106194570A (en) * | 2016-08-08 | 2016-12-07 | 国家电网公司 | The method reducing the alert rate of Turbine Governor System Feedback of Power fault misdescription |
| CN107676218A (en) * | 2017-09-15 | 2018-02-09 | 中国长江电力股份有限公司 | A kind of giant turbine speed regulator master, which connects, follows fault judgment method |
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