CN104391517A - Water wheel overspeed control method based on output pulse frequency - Google Patents
Water wheel overspeed control method based on output pulse frequency Download PDFInfo
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- CN104391517A CN104391517A CN201410687958.2A CN201410687958A CN104391517A CN 104391517 A CN104391517 A CN 104391517A CN 201410687958 A CN201410687958 A CN 201410687958A CN 104391517 A CN104391517 A CN 104391517A
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Abstract
The invention discloses a water wheel overspeed control method based on an output pulse frequency. The water wheel overspeed control method comprises the steps of forming m light sensing holes in the periphery of the water wheel at equal intervals, for a water wheel generator rotating at a speed n, generating output pulses fp by use of mn pulse output light rays passing through the light sensing holes rotating within a cycle each minute, thereby measuring the output pulses fp, obtaining the rotating speed n of the water wheel according to n=fp/m, presetting a normal water wheel rotating speed threshold, performing comparative analysis on the rotating speed n of the water wheel calculated in the step 3 and the preset normal threshold, and if the rotating speed n of the water wheel is higher than the normal threshold, giving an alarm by use of an alarm unit, and meanwhile, displaying the rotating speed in real time by use of a rotating speed display unit. The water wheel overspeed control method based on the output pulse frequency is simple, high in measurement accuracy and high in anti-jamming capability; the rotating speed of the water wheel generator can be accurately measured; damaged caused by overspeed can be effectively avoided by accurately measuring the rotating speed.
Description
Technical field
The present invention relates to a kind of supervisory system, particularly relate to a kind of water wheels based on output pulse frequency and cross speed control method, belong to monitoring field.
Background technology
Rotary speed data is one of important symbol of turbine-generator units operation conditions.Measuring the rotating speed of unit exactly and carry out the control operation of various necessity according to the change of rotating speed in time, to ensure that turbine-generator units is normal, safe operation, is the function that this supervising device should complete.
At present, what domestic water power station used is the old-fashioned Rotation rate signal devices such as magneto making alive relay system, mechanical type mostly, there is the shortcomings such as complex structure, measuring accuracy is low, functional reliability is poor.
In hydrogenerator set control system; overspeed protection system is as the important component part of unit control system; all-wing aircraft accident shines into great infringement to be mainly used in preventing unit from occurring; when there is force outage or removal of load in unit; cross the situations such as slow if there is governor fault tripping or stator closing velocity, just need unlatching accident to mate the direct guide vane closing of pressure valve.Once repeatedly there is the major accident that unit is overrun, all-wing aircraft shines in domestic and international power station, therefore improves the reliability of Hydropower Unit overspeed protection system.The speed of real-time detection turbine-generator units is even more important.
Such as application number is a kind of mechanical overspeed protection for water-wheel type generator set of " 201220703479.1 ", comprise revolution detector, counterweight, rotating speed electrical apparatus release, anchor ear, revolution detector is fixedly mounted on random groups main axis on set main shaft by anchor ear, and installs counterweight maintenance balance in the circumference symmetric position of revolution detector; Rotating speed electrical apparatus release is arranged on set main shaft side and leaves spacing with revolution detector; Unit failure distributing valve connects rotating speed electrical apparatus release, and all can start power-off operation program after receiving electric signal, hydraulic pressure signal or electric signal and hydraulic pressure signal.The beneficial effect of this utility model is quick on the draw, emergency distributing valve can be driven to shut down as long as rotating speed electrical apparatus release exports electric signal or hydraulic pressure signal or electric signal and hydraulic pressure signal two kinds of signals, thus start power-off operation program, prevent the generation of unit failure.Although this utility model solves the tachometric survey of hydraulic generator group, effectively carry out overspeed protection by tachometric survey, need to be further improved in rate accuracy.
And for example application number is " 201310276592.5 " a kind of hydrogenerator overspeed protection circuit and control method thereof, this hydrogenerator overspeed protection circuit comprises the n platform tachometer of measuring be installed on hydrogenerator, overspeed detection device and actuating unit of overrunning, n platform tachometer of measuring is connected with overspeed detection device, overspeed detection device is connected with actuating unit of overrunning, overspeed detection device receives the detection signal of n platform tachometer of measuring, when there being m platform tachometer of measuring hydrogenerator over speed of rotation to be detected, overspeed detection device exports to actuating unit of overrunning signal of overrunning, regulate hydrogenerator rotating speed, n be greater than 2 positive integer, m is the positive integer being greater than 2 and being less than n.Single whether being greater than 115%*Ne according to generating unit speed and moving of actuating unit of overrunning is avoided in this invention, avoids tach signal extremely to cause overspeed protection malfunction or tripping.Meanwhile, by setting up main joining according to dynamic condition, avoid main tripping signal of joining incorrect and cause overspeed protection malfunction.Although this invention solves the tachometric survey of hydraulic generator group, effectively carry out overspeed protection by tachometric survey, need to be further improved in rate accuracy.
Summary of the invention
Technical matters to be solved by this invention provides a kind of water wheels based on output pulse frequency for the deficiency of background technology to cross speed control method, and its structure is simple, measuring accuracy is high, antijamming capability is strong and accurately can measure the rotating speed of hydrogenerator.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A speed control method crossed by water wheels based on output pulse frequency, specifically comprises following steps:
Step one, a spaced set m photographic hole on the rotating disk of water wheels; Adopt light source vertical irradiation on rotating disk;
Step 2, presets water wheels rotating speed normality threshold;
Step 3, adopts the light signal that the collection of photo-electric pulse encoder is exported by photographic hole, and carries out shaping pulse to this light signal and obtain output pulse signal;
Step 4, calculates water wheels rotating speed according to n=fp/m, and wherein, n is rotating speed, and fp is for exporting pulse;
Step 5, the water wheels rotating speed n calculated according to step 4 and default water wheels rotating speed normality threshold are analyzed; If water wheels rotating speed n higher than normality threshold, then gives the alarm, and then regulate water wheels rotating speed to normal speed, show actual speed in real time simultaneously.
Cross the further preferred version of speed control method as a kind of water wheels based on output pulse frequency of the present invention, described m is 60.
Cross the further preferred version of speed control method as a kind of water wheels based on output pulse frequency of the present invention, in step 5, adopt acousto-optic warning unit to give the alarm.
Cross the further preferred version of speed control method as a kind of water wheels based on output pulse frequency of the present invention, described water wheels rotating speed normality threshold is 3000rpm.
Cross the further preferred version of speed control method as a kind of water wheels based on output pulse frequency of the present invention, in step 5, adopt charactron to show actual speed in real time.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, method is simple, measuring accuracy is high, antijamming capability is strong;
2, the rotating speed of hydrogenerator can accurately be measured;
3, by accurately measuring rotating speed, the harm that efficiently avoid overruns brings;
4, simplify hardware circuit, reduce cost of products, shorten the design cycle, improve reliability and the dirigibility of system.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, speed control method crossed by a kind of water wheels based on output pulse frequency, specifically comprises following steps:
Step one, a spaced set m photographic hole on the rotating disk of water wheels; Adopt light source vertical irradiation on rotating disk;
Step 2, presets water wheels rotating speed normality threshold;
Step 3, adopts the light signal that the collection of photo-electric pulse encoder is exported by photographic hole, and carries out shaping pulse to this light signal and obtain output pulse signal;
Step 4, calculates water wheels rotating speed according to n=fp/m, and wherein, n is rotating speed, and fp is for exporting pulse;
Step 5, the water wheels rotating speed n calculated according to step 4 and default water wheels rotating speed normality threshold are analyzed; If water wheels rotating speed n higher than normality threshold, then gives the alarm, and then regulate water wheels rotating speed to normal speed, show actual speed in real time simultaneously.
Wherein, n is rotating speed, and fp is for exporting pulse, and m is photographic hole quantity;
Wherein, described m is 60, and described micro-control module is FLEX10K series CPLD chip, and described water wheels rotating speed normality threshold is 3000rpm, and described rotating speed display unit is charactron.
Speed probe of the present invention adopts photo-electric pulse encoder, is coaxially connected with testing generator main shaft.Sensor is evenly distributed with 60 photographic holes, makes rotating speed be the hydrogenerator of n, per minute have 60n pulse to export, and namely per second have n pulse, therefore can be obtained the tachometer value n of hydrogenerator by the measurement of the output pulse frequency fp to sensor.
During work, first light source emitter by light signal vertical irradiation on rotating disk, by photographic hole output optical signal, light signal is converted to electric signal and exports pulse fp by photoelectric sensor, and then transfer to micro controller module calculating by pulse shaping amplification circuit, and then microcontroller draws water wheels rotating speed according to n=fp/m; Wherein, n is rotating speed, and fp is for exporting pulse, and m is photographic hole quantity; Can calculate water wheels rotating speed by formula, whether micro-control module in normal range, if exceed rated speed, then drives alarm unit to give the alarm according to the current rotating speed of water wheels rotating speed discriminatory analysis calculated.
Control system involved in the present invention adopts CPLD (ComplexProgrammable Logic Device) and a small amount of interface device to form, and the functional structure of system describes and adopts VHDL (Very HighSpeed Integrated Circuit Hardware DescriptionLanguage).Due to the CPLD chip that adopts can high density, high speed, realize to high-performance the design of complex digital system, hardware design is simplified greatly.There is the features such as design hardware configuration is simple, measuring accuracy is high, antijamming capability is strong.
FLEX10K family device is embedded PLD product, and each FLEX10K device comprises an embedded Array and a logic array.Embedded Array is made up of some embedded array block piece roof gardens, for realizing the logic function of various complexity.Logic array is made up of logic array block, for realizing generic logic.FLEX10K device adopts reconfigurable CNOSSRAM unit, and its structure assembly realizes the whole features needed for functional universal gate array, and device capacitance can reach 10,000 ~ 250,000.Have low in energy consumption, interconnection mode flexibly, support the features such as multivoltage I/O interface, can high density, high speed, high-performance whole system is integrated in individual devices.
Too low or the too high electricity generation system that all can affect of rotating speed due to turbine-generator units normally, safely works, and therefore needs to drive warning circuit and control circuit to ensure its operating rate in allowed limits accordingly.The setting value of rotating speed can according to the I/O functional pin preset input of the needs of actual set from CPLD, application VHDL language describes, the tachometer value recorded by CPLD compares with prevalue, transfinite and namely send signal to pilot relay group, make the corresponding actuating of relay, drive corresponding warning circuit and control circuit work.
Those skilled in the art of the present technique are understandable that, can realize the combination of the frame in each frame in these structural drawing and/or block diagram and/or flow graph and these structural drawing and/or block diagram and/or flow graph with computer program instructions.These computer program instructions can be supplied to the processor of multi-purpose computer, special purpose computer or other programmable data disposal routes to generate machine, thus be created the method for specifying in frame for realizing structural drawing and/or block diagram and/or flow graph or multiple frame by the instruction that the processor of computing machine or other programmable data disposal routes performs.
Those skilled in the art of the present technique are understandable that, the step in the various operations discussed in the present invention, method, flow process, measure, scheme can be replaced, change, combine or delete.Further, there is various operations, method, other steps in flow process, measure, the scheme discussed in the present invention also can be replaced, change, reset, decompose, combine or delete.Further, of the prior art have also can be replaced with the step in operation various disclosed in the present invention, method, flow process, measure, scheme, changed, reset, decomposed, combined or deleted.
The above is only some embodiments of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a speed control method crossed by the water wheels based on output pulse frequency, it is characterized in that: specifically comprise following steps:
Step one, a spaced set m photographic hole on the rotating disk of water wheels; Adopt light source vertical irradiation on rotating disk;
Step 2, presets water wheels rotating speed normality threshold;
Step 3, adopts the light signal that the collection of photo-electric pulse encoder is exported by photographic hole, and carries out shaping pulse to this light signal and obtain output pulse signal;
Step 4, calculates water wheels rotating speed according to n=fp/m, and wherein, n is rotating speed, and fp is for exporting pulse;
Step 5, the water wheels rotating speed n calculated according to step 4 and default water wheels rotating speed normality threshold are analyzed; If water wheels rotating speed n higher than normality threshold, then gives the alarm, and then regulate water wheels rotating speed to normal speed, show actual speed in real time simultaneously.
2. speed control method crossed by a kind of water wheels based on output pulse frequency according to claim 1, it is characterized in that: described m is 60.
3. speed control method crossed by a kind of water wheels based on output pulse frequency according to claim 1, it is characterized in that: in step 5, adopts acousto-optic warning unit to give the alarm.
4. speed control method crossed by a kind of water wheels based on output pulse frequency according to claim 1, it is characterized in that: described water wheels rotating speed normality threshold is 3000rpm.
5. speed control method crossed by a kind of water wheels based on output pulse frequency according to claim 1, it is characterized in that: in step 5, adopts charactron to show actual speed in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410687958.2A CN104391517A (en) | 2014-11-25 | 2014-11-25 | Water wheel overspeed control method based on output pulse frequency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410687958.2A CN104391517A (en) | 2014-11-25 | 2014-11-25 | Water wheel overspeed control method based on output pulse frequency |
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| CN104391517A true CN104391517A (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410687958.2A Withdrawn CN104391517A (en) | 2014-11-25 | 2014-11-25 | Water wheel overspeed control method based on output pulse frequency |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259364A (en) * | 2015-08-28 | 2016-01-20 | 无锡伊佩克科技有限公司 | Rotating speed detection and control method of automobile engine |
| CN109132756A (en) * | 2017-06-19 | 2019-01-04 | 株式会社日立制作所 | Lift appliance and its control method |
-
2014
- 2014-11-25 CN CN201410687958.2A patent/CN104391517A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259364A (en) * | 2015-08-28 | 2016-01-20 | 无锡伊佩克科技有限公司 | Rotating speed detection and control method of automobile engine |
| CN109132756A (en) * | 2017-06-19 | 2019-01-04 | 株式会社日立制作所 | Lift appliance and its control method |
| CN109132756B (en) * | 2017-06-19 | 2020-09-15 | 株式会社日立制作所 | Elevator device and control method thereof |
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Application publication date: 20150304 |