CN114439676A - Hydraulic turbine governor hydraulic fault accurate analysis system and method - Google Patents
Hydraulic turbine governor hydraulic fault accurate analysis system and 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a hydraulic fault accurate analysis system and a method of a hydraulic turbine governor, wherein the system comprises a collector and a controller; the collector selects a signal, the controller calculates according to the collected servo valve feedback signal, a valve core position signal of the main distributing valve, a guide vane feedback signal and a guide vane given signal, compares the collected signal with a calculated value, and outputs an alarm signal based on a set threshold value. According to the method, the fault of the servo valve, the fault of the main distribution and the jam of the guide vane can be accurately analyzed through the accurate analysis of the hydraulic fault of the speed regulator, the fault point and the reason can be rapidly determined, the problems of failure in starting and stopping, over-speed of the unit and uncontrollable load caused by incomplete analysis, inaccurate analysis and untimely fault point discovery due to a single hydraulic fault analysis method are avoided, the operation reliability of the power plant unit and the stability of a power system are improved, an important guiding function is provided for the safety and the stability of a hydroelectric generating set in the industry, and the method is suitable for being comprehensively popularized in the industry.
Description
Technical Field
The invention relates to the field of hydropower station speed regulator control systems, in particular to a hydraulic fault accurate analysis system and method for a hydraulic turbine speed regulator.
Background
The speed regulator of the hydropower station controls the opening and closing of the guide vane by controlling the proportional servo valve to adjust the position of the valve core of the main distributing valve to change the direction and the size of pressure oil flow, so as to adjust the output and the frequency of the hydraulic generator. The hydraulic fault can cause the follow-up of the guide vane to be reduced, so that the unit is over-speed, the load is uncontrollable, the start-up and shutdown are failed, and the safety of a power plant and a power grid is threatened.
At present, a hydraulic fault analysis method of a speed regulator in a hydraulic power plant is single, only guide vane setting and guide vane feedback deviation plus delay are adopted as a criterion of the hydraulic fault, and delay is difficult to set due to the fact that the response of a guide vane servomotor has hysteresis and the guide vane requires time to adjust, so that misdiagnosis is easy to occur, and diagnosis failure is easy to cause.
The hydraulic faults of the speed regulator comprise servo valve faults, main pressure distribution valve faults, guide vane jamming and the like, and the hydraulic faults of the speed regulator can be analyzed only by guide vane setting and guide vane feedback deviation delay in the current hydraulic power plant, and specific element faults cannot be accurately analyzed, so that the fault troubleshooting is not facilitated.
Disclosure of Invention
In order to solve the problems, the invention provides a hydraulic fault accurate analysis system and a hydraulic fault accurate analysis method for a hydraulic turbine governor.
The technical scheme of the invention is as follows:
a hydraulic fault accurate analysis system of a hydraulic turbine governor comprises a collector and a controller; the collector selects signals, and the controller carries out the following calculation through collected servo valve feedback signals, valve core position signals of the main distributing valve, guide vane feedback signals and guide vane given signals:
Yg-Yf＝a
Sg-Sf＝b
Yf1-Yf2＝c；
wherein:
a-deviation of the set value of the guide vane from the actual value;
b-deviation of the set value of the servo valve from the actual value;
c, deviation of an actual value of the guide vane at the later moment and an actual value of the guide vane at the previous moment;
Yg-a guide vane give; y isf-a guide vane feedback; sg-servo valve setting; sf-servo valve feedback;
Yf1-a previous time vane feedback; y isf2-a guide vane feedback at a later time; w-position feedback of a main matched valve core;
and comparing the acquired signal with the calculated value, and outputting an alarm signal based on a set threshold value.
Further, setting a threshold specifically as follows:
the deviation threshold value of the set value and the actual value of the x-guide vane is used as a trigger hydraulic fault analysis condition, the condition is set on site according to the characteristics of the speed regulator, the requirement for stable operation of the unit is met, and the condition is set on site according to the characteristics of the unit in a delayed manner;
y is a deviation threshold value of a set value and an actual value of the servo valve, the deviation threshold value is set on site according to the characteristics of the speed regulator, the requirement for stable operation of the unit is met, and the deviation threshold value is delayed to be set on site according to the characteristics of the unit;
z is a guide vane jamming threshold value, and is set on site according to the characteristics of the speed regulator, so that the requirement of stable operation of the unit is met, and the delay is set on site according to the characteristics of the unit;
m is a threshold value of the position feedback of the main matching valve core, and is set on site according to the characteristics of the speed regulator, so that the requirement of stable operation of the unit is met, and the on-site setting is delayed according to the characteristics of the unit.
Further, when the absolute value of the deviation between the guide vane setting value and the actual value is larger than a threshold value when the absolute value of the deviation of the guide vane setting value and the actual value is larger than the threshold value, the controller counts time, and the absolute value of the deviation of the guide vane is still larger than the threshold value after a certain time, a hydraulic fault analysis method is triggered, and the controller starts the following analysis;
if the absolute value of the deviation is larger than the deviation threshold value of the servo valve for a certain time, judging that the proportional servo valve is sticky or jammed, and issuing a servo valve fault alarm;
if the absolute value a is larger than x and the absolute value b is smaller than or equal to y, analyzing the position of a valve core of the main distribution valve, determining whether the position of the main distribution valve core moves in the positive direction or the negative direction according to the feedback deviation between the guide vane and the guide vane when the main distribution valve core is in the middle position under normal conditions, wherein a is larger than x and W is smaller than m, namely when the feedback deviation between the guide vane and the guide vane is larger than the deviation threshold value of the guide vane, the main distribution valve core moves in the positive direction, and at the moment, if the position feedback of the main distribution valve core is smaller than the main distribution threshold value;
or a < x and W > -m means that when the deviation between the given guide vane and the feedback guide vane is smaller than the negative guide vane deviation threshold value, the main distribution valve core moves towards the negative direction, the position feedback of the main distribution valve core is larger than the negative main distribution threshold value, the position feedback of the main distribution valve core always meets the former condition within a certain time delay, namely, the main distribution is judged to have viscosity or jam, and main distribution fault alarm information is output.
Further, the controller performs guide vane bite analysis to guide vane bite from | a->Marking the feedback actual value of the guide vane by Y when the deviation between the given and feedback of the x guide vane triggers the hydraulic fault to start analysisf1After a certain time delay, a new guide vane feedback actual value Y is takenf2Feedback actual value Y of guide vane with markf1Comparing, if | c | is less than or equal to z, the absolute value of the deviation between the new guide vane feedback value and the marked guide vane feedback value is less than or equal to zAnd (4) judging that the guide vane has a jamming phenomenon by using a vane jamming threshold value, and outputting guide vane jamming alarm information.
Further, the system also comprises a display and an alarm module; the display displays the information collected by the collector, the input information and the final judgment result; the alarm module receives the alarm signal of the processor to alarm.
The invention also relates to a hydraulic fault accurate analysis method of the hydraulic turbine governor, which comprises the following steps: selecting signals, checking elements of the control guide vanes one by one according to a sequential control flow of the control guide vanes through collected servo valve feedback signals, valve core position signals of the main distribution valve, guide vane feedback signals and guide vane setting signals, and accurately positioning servo valve faults, main distribution faults and guide vane jamming through servo valve feedback and servo valve setting comparison and main distribution valve core position comprehensive analysis.
Further, the following calculation is carried out through the collected servo valve feedback signal, the valve core position signal of the main distributing valve, the guide vane feedback signal and the guide vane given signal:
Yg-Yf＝a
Sg-Sf＝b
Yf1-Yf2＝c；
wherein:
a-deviation of the set value of the guide vane from the actual value;
b-deviation of the set value of the servo valve from the actual value;
c, deviation of the actual value of the guide vane at the later moment and the actual value of the guide vane at the previous moment;
Yg-a guide vane give; y isf-a guide vane feedback; sg-servo valve setting; sf-servo valve feedback;
Yf1-a previous time vane feedback; y isf2-a guide vane feedback at a later time; w-position feedback of a main matched valve core;
setting a threshold value specifically as follows:
the deviation threshold value of the set value and the actual value of the x-guide vane is used as a trigger hydraulic fault analysis condition, the condition is set on site according to the characteristics of the speed regulator, the requirement for stable operation of the unit is met, and the condition is set on site according to the characteristics of the unit in a delayed manner;
the deviation threshold value of the set value and the actual value of the y-servo valve is set on site according to the characteristics of the speed regulator, the requirement for stable operation of the unit is met, and the on-site setting is delayed according to the characteristics of the unit;
the z-guide vane jamming threshold value is set on site according to the characteristics of the speed regulator, the requirement for stable operation of the unit is met, and the delay is set on site according to the characteristics of the unit;
and m-a threshold value fed back by the position of the main matching valve core is set on site according to the characteristics of the speed regulator, the requirement of stable operation of the unit is met, and the on-site setting is delayed according to the characteristics of the unit.
Further, when the absolute value of the deviation between the guide vane set value and the actual value is larger than a threshold value when the absolute value of the deviation is larger than x, the controller times, and the absolute value of the deviation of the guide vane is still larger than the threshold value after a certain time, the hydraulic fault analysis method is triggered, and the following analysis is started;
if the absolute value of the deviation is larger than the deviation threshold value of the servo valve for a certain time, judging that the proportional servo valve is sticky or jammed, and issuing a servo valve fault alarm;
if the absolute value a is larger than x and the absolute value b is smaller than or equal to y, analyzing the position of a valve core of the main distribution valve, determining whether the position of the main distribution valve core moves in the positive direction or the negative direction according to the feedback deviation between the guide vane and the guide vane when the main distribution valve core is in the middle position under normal conditions, wherein a is larger than x and W is smaller than m, namely when the feedback deviation between the guide vane and the guide vane is larger than the deviation threshold value of the guide vane, the main distribution valve core moves in the positive direction, and at the moment, if the position feedback of the main distribution valve core is smaller than the main distribution threshold value;
or a < x and W > -m, namely when the deviation between the given guide vane and the feedback guide vane is smaller than a negative guide vane deviation threshold value, the main distribution valve core moves towards the negative direction, the position feedback of the main distribution valve core is larger than the negative main distribution threshold value at the moment, the position feedback of the main distribution valve core meets the former condition within certain time delay, namely the main distribution is judged to have viscosity or jam, and main distribution fault alarm information is output;
if notAnalyzing the jam of guide vanes when the servo valve fails and the main distribution fails, and performing secondary gamma ray calculation>Marking the feedback actual value of the guide vane by Y when the deviation between the given and feedback of the x guide vane triggers the hydraulic fault to start analysisf1After a certain time delay, a new guide vane feedback actual value Y is takenf2Feedback actual value Y of guide vane with markf1And comparing, if the absolute value of the deviation between the new guide vane feedback value and the marked guide vane feedback value is less than the guide vane jamming threshold value, judging that the guide vane has jamming, and outputting guide vane jamming alarm information.
Compared with the prior art, the invention has the following beneficial effects:
by accurately analyzing the hydraulic fault of the speed regulator, the invention can accurately analyze the fault of the servo valve, the main distribution fault and the guide vane jamming, quickly determine the fault point and the reason, avoid the problems of failure in starting and stopping, over-speed of the unit and uncontrollable load caused by incomplete analysis, inaccurate analysis and untimely fault point discovery due to a single hydraulic fault analysis method, improve the operation reliability of the power plant unit and the stability of an electric power system, play an important role in guiding the safety and the stability of the hydraulic turbine generator set in the industry and is suitable for being comprehensively popularized in the industry.
Drawings
FIG. 1 is a schematic view of a control process of the present embodiment;
FIG. 2 is a system block diagram of the present embodiment;
fig. 3 is a main valve spool position diagram of the present embodiment.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples without making any creative effort, shall fall within the protection scope of the present application.
Unless defined otherwise, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art. The use of "first," "second," and similar terms in the present embodiments does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "Upper," "lower," "left," "right," "lateral," "vertical," and the like are used solely in relation to the orientation of the components in the figures, and these directional terms are relative terms that are used for descriptive and clarity purposes and that can vary accordingly depending on the orientation in which the components in the figures are placed.
The water turbine speed regulating system has the functions of regulating the active power output of the unit, maintaining the frequency (rotating speed) of the unit and realizing the start and stop of the unit, and is mainly realized by regulating the opening degree of a guide vane of the unit so as to change the flow entering the water turbine unit.
At present, the opening of the guide vane is basically controlled by a hydraulic system, namely, pressure oil with high pressure is injected into an opening cavity and a closing cavity of the guide vane servomotor to control, the pressure oil is injected into the closing cavity, the servomotor moves towards the closing direction, the guide vane is closed, otherwise, the pressure oil is injected into the opening cavity, the servomotor moves towards the opening direction, and the guide vane is opened.
The pressure oil is injected into the opening cavity or the closing cavity through adjusting the main pressure distributing valve, and because the main pressure distributing valve needs large energy for driving and is not directly driven by electricity, a servo valve is generally arranged on the main pressure distributing valve, and the servo valve is driven by an electric signal to adjust the action of the main pressure distributing valve, so that the action of the opening direction and the action of the closing direction of the guide vane are realized.
Therefore, in the general guide vane control process, an electric signal is sent to the servo valve through the controller, the main pressure distribution valve is driven to act after the servo valve acts, and finally the guide vane acts. When any link in the whole process is in a problem, the guide vane does not act, and the whole process is used for controlling the flow direction of pressure oil to achieve the purpose, so that when any link fails, the hydraulic failure is generally called, and the main performance is that the opening degree of the guide vane does not act along with the opening degree set by the controller.
As shown in fig. 1 and 2, the hydraulic governor hydraulic fault accurate analysis system of the present embodiment includes an input end, a collector, a controller, an alarm and a display.
The collector selects signals, and the controller calculates according to collected servo valve feedback signals, valve core position signals of the main pressure distributing valve, guide vane feedback signals and guide vane given signals. The controller analyzes the collected signals and the calculated values. According to the sequential control flow of the control guide vanes, elements of the control guide vanes are checked one by one, and the servo valve fault, the main distribution fault and the guide vane jam are accurately positioned through servo valve feedback and servo valve given comparison and main distribution valve core position comprehensive analysis. The controller outputs an alarm signal based on a set threshold value input by the input end. The display displays the information collected by the collector, the input information and the final judgment result; the alarm module receives the alarm signal of the processor to alarm.
It should be noted that the division of the modules of the above apparatus is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; and part of the modules can be realized in the form of calling software by the processing element, and part of the modules can be realized in the form of hardware.
The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software.
For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when some of the above modules are implemented in the form of a processing element scheduler code, the processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor that can call the program code. As another example, these modules may be integrated together and implemented in the form of a System-on-a-chip (SOC).
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a readable storage medium or transmitted from one readable storage medium to another readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component.
Based on the system, the method for accurately analyzing the hydraulic fault of the hydraulic turbine governor comprises the following steps:
step one, signal selection
The signals are selected as required, as shown in table 1 below:
TABLE 1
Step two, calculating
The controller carries out the following calculation inside the controller by acquiring a servo valve feedback signal, a valve core position signal of the main pressure distributing valve, a guide vane feedback signal and a guide vane given signal:
Yg-Yf＝a
Sg-Sf＝b
Yf1-Yf2＝c；
wherein:
a-deviation of the set value of the guide vane from the actual value;
b-deviation of the set value of the servo valve from the actual value;
c, deviation of an actual value of the guide vane at the later moment and an actual value of the guide vane at the previous moment;
Ygguide vane given (set value), Yf-guide vane feedback (actual value);
Sgservo valve set (setpoint), Sf-servo valve feedback (actual value);
Yf1guide vane feedback (actual value), Y, at a previous timef2-guide vane feedback (actual value) at a later time instant;
w-main valve spool position feedback (actual value).
Step three, analysis
The controller analyzes through the collected signals and the calculated values:
3.1, setting a threshold (alarm value) through an input end:
the deviation threshold value of the set value and the actual value of the x-guide vane is used as a trigger hydraulic fault analysis condition, the condition is set on site according to the characteristics of the speed regulator, the requirement for stable operation of the unit is met, and the condition is set on site according to the characteristics of the unit in a delayed manner;
y is a deviation threshold value of a set value and an actual value of the servo valve, the deviation threshold value is set on site according to the characteristics of the speed regulator, the requirement for stable operation of the unit is met, and the deviation threshold value is delayed to be set on site according to the characteristics of the unit;
z is a guide vane jamming threshold value, and is set on site according to the characteristics of the speed regulator, so that the requirement of stable operation of the unit is met, and the delay is set on site according to the characteristics of the unit;
m is the threshold value of the position feedback (actual value) of the main matching valve core, and is set on site according to the characteristics of the speed regulator, so that the requirement of stable operation of the unit is met, and the time delay is set on site according to the characteristics of the unit.
3.2, when the absolute value of the deviation between the set value and the actual value of the guide vane is greater than a threshold value when the absolute value of the deviation of the set value and the actual value of the guide vane is greater than the threshold value, timing, and triggering a hydraulic fault analysis method to start the following analysis after the absolute value of the deviation of the guide vane is still greater than the threshold value after a certain time;
3.3, after the condition is met (| a | > x), fault analysis is carried out one by one according to the action sequence of the guide vane object, if | b | > y lasts for a certain time, the absolute value of the deviation is always larger than the deviation threshold value of the servo valve, the fact that the proportional servo valve is sticky or jammed can be analyzed, and a fault alarm of the servo valve is given;
3.4, if | a | > x and | b | are less than or equal to y, analyzing the position of a valve core of the main distribution valve, if the main distribution valve core is in the middle position under normal conditions, determining whether the position of the main distribution valve core should move in a positive direction or a negative direction according to the given deviation of the guide vane and the feedback deviation of the guide vane, wherein a > x and W < m (when the given deviation of the guide vane and the feedback deviation of the guide vane is greater than the deviation threshold value of the guide vane, the main distribution valve core should move in the positive direction, at the moment, if the position feedback of the main distribution valve core is less than the main distribution threshold value) or a < x and W > -m (when the given deviation of the guide vane and the feedback deviation of the feedback of the guide vane is less than the deviation threshold value of the negative guide vane, the position feedback of the main distribution valve core is greater than the negative main distribution threshold value at the moment), analyzing the viscous or unsmooth state of the main distribution valve core in the guide vane and opening a main distribution fault; the main valve spool position diagram is shown in figure 3.
3.5, if the faults are not the faults of the servo valve and the main distribution fault, analyzing the jamming of the guide vanes, and performing branch calculation from | a->Marking the feedback actual value of the guide vane by Y when the deviation between the given and feedback of the x guide vane triggers the hydraulic fault to start analysisf1After a certain time delay, a new guide vane feedback actual value Y is takenf2Feedback actual value Y of guide vane with markf1And comparing, and if the absolute value of the deviation between the new guide vane feedback value and the marked guide vane feedback value is less than or equal to z, analyzing that the guide vane has a jamming phenomenon and giving out guide vane jamming alarm.
Optionally, an embodiment of the present application further provides a storage medium, where instructions are stored, and when the storage medium is run on a computer, the storage medium causes the computer to execute the method according to the embodiment described above.
Optionally, an embodiment of the present application further provides a chip for executing the instruction, where the chip is configured to execute the method in the foregoing illustrated embodiment.
As a specific example:
for the example of bay, a certain analysis set the thresholds as follows:
x＝8，y＝5，z＝5，m＝100。
the current guide vane feedback actual value is 30, meanwhile, the given set value of the monitoring guide vane is changed into 40, if a is 10 to 8, timing is started, and if a is 8 within 5 seconds, hydraulic fault analysis is started;
and analyzing the servo valve in sequence, if the deviation | b | is greater than 5 between the set value of the servo valve and the actual value of the servo valve and the deviation | b | is greater than 5 in the next 0.5 second, judging that the servo valve is in fault, and issuing an alarm signal. If | b | <5, the servo valve is proved to normally act, and if no fault exists, the main pressure distribution valve is continuously analyzed;
at the moment, a is more than 8 and | b | <5, the valve core position of the main distributing valve should act towards the positive direction, the position feedback (actual value) W of the main distributing valve core should be a positive value and is more than the threshold value 100 set by the user, if W is less than 100 at the moment, the main distributing valve is proved to be jammed, the main distributing fault is opened, if a < -8 and | b | <5, the valve core position of the main distributing valve should act towards the negative direction, the position feedback (actual value) W of the main distributing valve core should be a negative value and is less than the negative number of the threshold value 100 set by the user, if W < -100 at the moment, the jamming of the main distributing valve is proved, and the main distributing fault is still opened; in addition, the valve core of the main pressure distribution valve is proved to act correctly without failure, and the guide vane jamming is continuously analyzed;
recording the guide vane feedback actual value Y at the momentf1Continuously reading the guide vane feedback actual value within 10 seconds from the beginning and recording as Yf2If c is satisfied within 10 seconds>And 5, the guide vane is proved to be jammed, and the guide vane is turned on to alarm.
Therefore, the bay power plant successfully analyzes the hydraulic fault of the speed regulator by the accurate hydraulic fault analysis method, and can inquire the fault through monitoring system alarm information and a speed regulator control cabinet human-computer interface alarm window, and the method comprises the following steps: hydraulic faults, servo valve (feedback) faults, guide vane jamming (guide vane total fault) so as to find fault points in time.
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, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides an accurate analytic system of hydraulic governor hydraulic pressure trouble which characterized in that: comprises a collector and a controller; the collector selects signals, and the controller carries out the following calculation through collected servo valve feedback signals, valve core position signals of the main distributing valve, guide vane feedback signals and guide vane given signals:
Yg-Yf＝a
Sg-Sf＝b
Yf1-Yf2＝c；
wherein:
a, deviation of a set value and an actual value of the guide vane;
b-deviation of the set value and the actual value of the servo valve;
c, deviation of an actual value of the guide vane at the later moment and an actual value of the guide vane at the previous moment;
Yg-guide vane setting; y isf-guide vane feedback; sg-servo valve setting; sf-servo valve feedback;
Yf1-guide vane feedback at a previous time; y isf2-guide vane feedback at a later time; w is position feedback of a main matched valve core;
and comparing the acquired signal with the calculated value, and outputting an alarm signal based on a set threshold value.
2. The system of claim 1, wherein: setting a threshold value specifically as follows:
x is a deviation threshold value of a set value and an actual value of the guide vane, which is used as a trigger hydraulic fault analysis condition, is set on site according to the characteristics of the speed regulator, so that the requirement of stable operation of the unit is met, and is delayed to be set on site according to the characteristics of the unit;
y is a deviation threshold value of a set value and an actual value of the servo valve, the deviation threshold value is set on site according to the characteristics of the speed regulator, the requirement for stable operation of the unit is met, and the deviation threshold value is delayed to be set on site according to the characteristics of the unit;
z is a guide vane jamming threshold value, and is set on site according to the characteristics of the speed regulator, so that the requirement of stable operation of the unit is met, and the delay is set on site according to the characteristics of the unit;
m is a threshold value of the position feedback of the main matching valve core, and is set on site according to the characteristics of the speed regulator, so that the requirement of stable operation of the unit is met, and the on-site setting is delayed according to the characteristics of the unit.
3. The system of claim 2, wherein: when the absolute value of the deviation between the set value and the actual value of the guide vane is larger than the threshold value, the controller times, and the absolute value of the deviation of the guide vane is still larger than the threshold value after a certain time, the hydraulic fault analysis method is triggered, and the controller starts the following analysis;
if the absolute value of the deviation is larger than the deviation threshold value of the servo valve for a certain time, judging that the proportional servo valve is sticky or jammed, and issuing a servo valve fault alarm;
if the absolute value a is larger than x and the absolute value b is smaller than or equal to y, analyzing the position of a valve core of the main distribution valve, determining whether the position of the main distribution valve core moves in the positive direction or the negative direction according to the feedback deviation between the guide vane and the guide vane when the main distribution valve core is in the middle position under normal conditions, wherein a is larger than x and W is smaller than m, namely when the feedback deviation between the guide vane and the guide vane is larger than the deviation threshold value of the guide vane, the main distribution valve core moves in the positive direction, and at the moment, if the position feedback of the main distribution valve core is smaller than the main distribution threshold value;
or a < x and W > -m means that when the deviation between the given guide vane and the feedback guide vane is smaller than the negative guide vane deviation threshold value, the main distribution valve core moves towards the negative direction, the position feedback of the main distribution valve core is larger than the negative main distribution threshold value, the position feedback of the main distribution valve core always meets the former condition within a certain time delay, namely, the main distribution is judged to have viscosity or jam, and main distribution fault alarm information is output.
4. The system of claim 2, wherein: the controller analyzes the guide vane jamming and transmits the air from | a->Marking the feedback actual value of the guide vane by Y when the deviation between the given and feedback of the x guide vane triggers the hydraulic fault to start analysisf1After a certain time delay, a new guide vane feedback actual value Y is takenf2Feedback actual value Y of guide vane with markf1And comparing, if the absolute value of the deviation between the new guide vane feedback value and the marked guide vane feedback value is less than the guide vane jamming threshold value, judging that the guide vane has jamming, and outputting guide vane jamming alarm information.
5. The system of claim 1, wherein: the system also comprises a display and an alarm module; the display displays the information collected by the collector, the input information and the final judgment result; the alarm module receives the alarm signal of the processor to alarm.
6. A hydraulic fault accurate analysis method for a hydraulic turbine governor is characterized by comprising the following steps: the method comprises the following steps: selecting signals, checking elements of the control guide vanes one by one according to a sequential control flow of the control guide vanes through collected servo valve feedback signals, valve core position signals of the main distribution valve, guide vane feedback signals and guide vane setting signals, and accurately positioning servo valve faults, main distribution faults and guide vane jamming through servo valve feedback and servo valve setting comparison and main distribution valve core position comprehensive analysis.
7. The method of claim 6, wherein: through the collected servo valve feedback signal, the valve core position signal of the main pressure distributing valve, the guide vane feedback signal and the guide vane given signal, the following calculation is carried out:
Yg-Yf＝a
Sg-Sf＝b
Yf1-Yf2＝c；
wherein:
a, deviation of a set value and an actual value of the guide vane;
b-deviation of the set value and the actual value of the servo valve;
c, deviation of the actual value of the guide vane at the later moment and the actual value of the guide vane at the previous moment;
Yg-guide vane setting; y isf-guide vane feedback; sg-servo valve setting; s. thef-servo valve feedback;
Yf1-guide vane feedback at a previous time; y isf2-guide vane feedback at a later time; w is position feedback of a main matching valve core;
setting a threshold value specifically as follows:
x is a deviation threshold value of a set value and an actual value of the guide vane, which is used as a trigger hydraulic fault analysis condition, is set on site according to the characteristics of the speed regulator, so that the requirement of stable operation of the unit is met, and is delayed to be set on site according to the characteristics of the unit;
y is a deviation threshold value of a set value and an actual value of the servo valve, the deviation threshold value is set on site according to the characteristics of the speed regulator, the requirement for stable operation of the unit is met, and the deviation threshold value is delayed to be set on site according to the characteristics of the unit;
z is a guide vane jamming threshold value, and is set on site according to the characteristics of the speed regulator, so that the requirement of stable operation of the unit is met, and the delay is set on site according to the characteristics of the unit;
m is a threshold value of the position feedback of the main matching valve core, and is set on site according to the characteristics of the speed regulator, so that the requirement of stable operation of the unit is met, and the on-site setting is delayed according to the characteristics of the unit.
8. The method of claim 6, wherein: when the absolute value of the deviation between the set value and the actual value of the guide vane is larger than the threshold value, the controller times, and the absolute value of the deviation of the guide vane is still larger than the threshold value after a certain time, the hydraulic fault analysis method is triggered to start the following analysis;
if the absolute value of the deviation is larger than the deviation threshold value of the servo valve for a certain time, judging that the proportional servo valve is sticky or jammed, and issuing a servo valve fault alarm;
if the absolute value of a is larger than x and the absolute value of b is smaller than or equal to y, analyzing the position of a valve core of the main distributing valve, and determining whether the position of the main distributing valve core moves in a positive direction or a negative direction according to the feedback deviation given by the guide vane when the main distributing valve core is in the middle position under normal conditions, wherein a is larger than x and W is smaller than m, namely when the feedback deviation given by the guide vane and the feedback deviation of the guide vane is larger than the deviation threshold value of the guide vane, the main distributing valve core moves in the positive direction, and if the position feedback of the main distributing valve core is smaller than the main distributing threshold value at the moment;
or a < x and W > -m, namely when the deviation between the given guide vane and the feedback guide vane is smaller than a negative guide vane deviation threshold value, the main distribution valve core moves towards the negative direction, the position feedback of the main distribution valve core is larger than the negative main distribution threshold value at the moment, the position feedback of the main distribution valve core meets the former condition within certain time delay, namely the main distribution is judged to have viscosity or jam, and main distribution fault alarm information is output;
if not, the servo valve failsAnd main distribution fault, carrying out guide vane jamming analysis, and calculating the degree of qi from the | a->Marking the feedback actual value of the guide vane by Y when the deviation between the given and feedback of the x guide vane triggers the hydraulic fault to start analysisf1After a certain time delay, a new guide vane feedback actual value Y is takenf2Feedback actual value Y of guide vane with markf1And comparing, if the absolute value of the deviation between the new guide vane feedback value and the marked guide vane feedback value is less than the guide vane jamming threshold value, judging that the guide vane has jamming, and outputting guide vane jamming alarm information.
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