CN103048485A - Rotating speed measuring method and measuring system of wind driven generator - Google Patents
Rotating speed measuring method and measuring system of wind driven generator Download PDFInfo
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- CN103048485A CN103048485A CN2013100080020A CN201310008002A CN103048485A CN 103048485 A CN103048485 A CN 103048485A CN 2013100080020 A CN2013100080020 A CN 2013100080020A CN 201310008002 A CN201310008002 A CN 201310008002A CN 103048485 A CN103048485 A CN 103048485A
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Abstract
The invention relates to a rotating speed measuring method and a measuring system of a wind driven generator. The method comprises the following steps of: presetting a gate signal, and generating a standard pulse signal; measuring a measured pulse signal when a wind driven generator set rotates; when the gate signal is in the high level and is at the raising edge of the measured pulse signal, respectively counting the measured pulse signal and the standard pulse signal; when the gate signal is in the low level and is at the raising edge of the measured pulse signal, stopping counting; calculating the frequency of the measured pulse signal according to the frequency and the counting value of the standard pulse signal, and the counting value of the measured pulse signal; and calculating the rotating speed of the wind driven generator set. The system comprises a pulse measuring device and an equal precision frequency analyzing device. Through the method and the device, an equal precision frequency measuring technology is used, so that the measurement error of the rotating speed is reduced, the measuring precision is improved, the measuring precision can be kept constant, and the control ability and the control precision of the wind driven generator set can be improved.
Description
Technical field
The present invention relates to technical field of wind power generation, particularly relate to rotating speed measurement method and the measuring system thereof of aerogenerator.
Background technology
Along with wind-power electricity generation constantly develops, the wind energy turbine set installed capacity is risen year by year in recent years, and the shared ratio of wind-power electricity generation is increasing, becomes gradually a kind of conventional energy resources.The tachometric survey of wind-powered electricity generation unit be the torque of unit given, become the important step in the processes such as oar control and safeguard protection, therefore studying high-precision rotating speed measurement method has far reaching significance.
Existing wind power generating set rotation-speed measuring device adopts the target detection form more.Because the instability of natural wind, the rotating speed of wind power generating set is in larger fluctuation range with wind regime, and the double feed wind power generator group range of speeds is from 0rpm to 10 usually
3Rpm, the detection pulsed frequency that is produced by the variation of rotating speed also is present in a wider variation range.Traditional frequency measuring method is divided into Measuring Frequency Method and surveys all methods, carries out timing or counting within fixing gate time, because gate-control signal is asynchronous with measured signal, measured value can produce the error of a pulse.Therefore, detect rotation speed of fan with traditional frequency measurement method, in whole range, can produce the measuring accuracy that does not wait, increased the nonlinear degree of control parameter drift, and then the control accuracy of wind-powered electricity generation unit caused direct impact, therefore the tachometer value that obtains can't be applied in the complete machine control.In addition, the slow-speed shaft rotating speed of the device measuring wind-powered electricity generation units such as employing scrambler although can guarantee higher measuring accuracy, has also improved production cost simultaneously.
This shows, in the prior art rotating speed of wind-powered electricity generation unit and measuring method and the device of frequency are existed various shortcomings and deficiencies, therefore, how to found the synchronous frequency measurement technology of precision such as a kind of employing, reduce the tachometric survey error, improve measuring accuracy, guarantee the constant of measuring accuracy, depend on rotating speed measurement method and the measuring system thereof that rotating speed carries out the aerogenerator of the control ability of wind power generating set of torque control and control accuracy thereby improve, to become one of current important research and development problem.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of rotating speed measurement method and measuring system thereof of aerogenerator, make the synchronous frequency measurement technology of the precision such as it adopts, reduce the tachometric survey error, improve measuring accuracy, guarantee the constant of measuring accuracy, depend on control ability and the control accuracy that rotating speed carries out the wind power generating set of torque control thereby improve, overcome the deficiencies in the prior art.
In order to solve the problems of the technologies described above, the present invention at first provides a kind of rotating speed measurement method of aerogenerator, may further comprise the steps:
A. preset gate lock signal, and generation full sized pules signal;
B. measure the measured pulse signal that wind power generating set is rotated;
C. working as a door lock signal is high level, and when the rising edge of measured pulse signal, begins respectively to measured pulse signal and full sized pules signal-count;
D. working as a door lock signal is low level, and when the rising edge of measured pulse signal, stops counting;
E. according to the count value of frequency, count value and the measured pulse signal of full sized pules signal, calculate the frequency of measured pulse signal;
F. according to frequency and the door lock time of measured pulse signal, calculate the rotating speed of wind power generating set.
As further improvement, among the described step B, the measured pulse signals collecting is from the slow-speed shaft of wind power generating set.
After the described step F, also comprise the rotating speed of the wind power generating set of trying to achieve and the Design of Rotation threshold value of this unit are compared, when being judged as overspeed condition, output overspeed signal and starting protection pattern.
The frequency of described full sized pules signal is not less than 10MHz.
The length of described door lock signal is not less than 1s.
In addition, the present invention also provides a kind of speed measuring system of using the aerogenerator of said method, comprise the impulsive measurement device of measuring the wind power generating set rotating speed and exporting the measured pulse signal, and to the precision such as the measured pulse signal carries out process and calculate etc. the precision frequency analyzing device; The precision frequency analyzing device such as described is built-in or be circumscribed with the crystal oscillator that produces the full sized pules signal, and comprise counter I to the full sized pules signal-count, counter II to the measured pulse signal-count, the main door I of control counter I, the main door II of control counter II, and receiving gate lock signal and measured pulse signal, and according to the trigger of these signal controlling master door I, II synchronous opening/closing.
As further improvement, the output terminal of the precision frequency analyzing device such as described also is connected with hypervelocity logical block and protection control module.
Described impulsive measurement device adopts IFM approach switch IGM200.
Described crystal oscillator adopts the 10MHz quartz oscillator.
Described counter I, II all adopt 32 high-speed counters.
After adopting above design, the present invention compared with prior art has following beneficial effect:
1, adopts the approach switch in the target detection form to give full play to its economy, simple, reliable characteristics, therefore, adopt the target detection technique of equal precision measurement to bring into play more vital role at industrial economy;
2, etc. the frequency measurement with constant-precision technology is called again multi-cycle synchronousing measuring technology, in whole tested frequency range, can both reach identical measuring accuracy with respect to its maximum characteristics of other frequency measuring methods, and it is irrelevant with measured signal frequency size, the tachometric survey precision is consistent in the whole working range of wind-powered electricity generation unit, and this forms very active influence to control and monitoring link;
3, the synchronous frequency measurement technology of precision such as employing will reduce the tachometric survey error, guarantee simultaneously the constant of measuring accuracy, and this will be conducive to improve and depend on control ability and the control accuracy that rotating speed carries out the wind power generating set of torque control.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Above-mentioned only is the general introduction of technical solution of the present invention, and for can clearer understanding the present invention, the present invention is described in further detail below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the module connection diagram of the speed measuring system of aerogenerator of the present invention.
Fig. 2 be aerogenerator of the present invention speed measuring system etc. the electric circuit constitute synoptic diagram of precision frequency analyzing device.
Fig. 3 is the schematic flow sheet of the rotating speed measurement method of aerogenerator of the present invention.
Embodiment
See also shown in Figure 1, the speed measuring system of aerogenerator of the present invention mainly comprise the impulsive measurement device and etc. the precision frequency analyzing device.Wherein, the impulsive measurement device is used for measuring the rotating speed of wind power generating set, and output measured pulse signal.The precision such as the measured pulse signal of exporting etc. precision frequency analyzing device paired pulses measurement mechanism carries out are processed and are calculated, and obtain generator speed.
Impulsive measurement device of the present invention adopts higher-order of oscillation type inductance approach switch, for example adopts Yi Fumen IFM approach switch IGM200, and can adjust according to the component parameters of actual conditions to input circuit.Behind its sensor plugged, oscillator produces vibration and produces specific electric current, the magnetic field concentration that oscillator coil produces is in the sensitive surface of sensor, when the close sensitive surface of the metal measured target on the wind generator set main shaft, produce eddy current in the object and consume oscillation energy, the amplitude of oscillator descends, the action of rear class trigger current, generation pulse output, pulse signal has stronger anti-interference in measurement and transmission course, and can demonstrate fully the economic advantages of this target detection form.
Please cooperate and consult the precision frequency analyzing device such as shown in Figure 2, of the present invention and mainly finish the control of measuring process, the functions such as processing of measurement result, mainly be formed by contactor, two main doors, two counters, and built-in or be circumscribed with crystal oscillator.
Wherein, crystal oscillator for example adopts the 10MHz quartz oscillator, for generation of the full sized pules signal.Counter I, preferred controlled 32 high-speed counters of employing of II, the counter I is used for the full sized pules signal-count, the counter II is used for the measured pulse signal-count, and main door I, II difference control criterion pulse signal and measured pulse signal are by counter I, II.CNT1_ENA and CNT2_ENA are respectively the counting Enable Pins of counter I CNT1 sum counter II CNT2, full sized pules signal input CNT1_CLK, the input end of clock CONT2_CLK of pulse signal input CNT2 to be measured.Trigger receives the GATE signal, and the clk of measured pulse signal access d type flip flop is held, and trigger is according to the synchronous opening/closing of these signal controlling master door I, II.
In addition, the present invention also can be connected with hypervelocity logical block and protection control module at the output terminal that waits the precision frequency analyzing device, for example adopts Yi Fumen IFM rate monitor DD2001.
Please cooperate and consult shown in Figure 3ly, the rotating speed measurement method of aerogenerator of the present invention may further comprise the steps.
Step 1, at first to counter O reset, by etc. the FPGA time block of precision frequency analyzing device produce and to preset software door lock signal GATE, and generate the full sized pules signal by crystal oscillator.Wherein, the time width of GATE is less on the impact of frequency-measurement accuracy, so can select in the larger context, the length of selecting preset gate lock signal here is 1s, and the frequency of full sized pules signal is advisable to be not less than 10MHz.
Step 2 gathers the measured pulse signal that wind power generating set is rotated by the impulsive measurement device, and better, the measured pulse signals collecting is from the slow-speed shaft of wind power generating set.
Step 3 when the GATE signal is high level, and when the rising edge of measured pulse signal, starts counter I CNT1 sum counter II CNT2, begins respectively to full sized pules signal and measured pulse signal-count.
Step 4 when the GATE signal is low level, and when the rising edge of measured pulse signal, is closed d type flip flop, stops counter I CNT1 sum counter II CNT2 counting.
Step 5 is according to the frequency f of full sized pules signal
0, count value N
0And the count value N of measured pulse signal
x, and according to f
x=(N
0/ N
x) f
0Calculate the frequency f of measured pulse signal
x
Step 6 is according to f
xAnd door lock time T
x, the rotating speed of calculating wind power generating set.
In addition, the present invention also can comprise a step 7, and the rotating speed that the wind power generating set of trying to achieve after precision is processed such as will pass through compares with the Design of Rotation threshold value of this unit, and when being judged as overspeed condition, the output overspeed signal also offers the use of control protection system.
Below, utilize uncertainty analysis that tachometric survey precision of the present invention is analyzed.
Uncertain formula is:
1/f
x0=1/(f
0×N
x)×(N
0+ΔN
0) ①
Traditional calculations result is:
1/f
x0=1/t
1×(N
x+ΔN
x) ②
t
1: the measuring-signal time;
Composite formula is:
U
c(T
1)=sqrt[μ
2((D
r 2+D
f 2))] ③
T
1: treat the plain cloth variable;
μ: uncertain factor;
D
r: constant;
D
f: uncertain constant;
With above-mentioned formula substitution, obtain that the precision such as employing of the present invention is processed and the result of classic method is respectively:
U
c1(1/f
x0)=sqrt[(1/(f
0×N
x))
2 u(ΔN
0 2)] ④
U
c2(1/f
x0)=sqrt[(1/T
1)
2× u(ΔN
x 2)] ⑤
Two kinds of method correlative values:
θ=U
c1(1/f
x0)/U
c2(1/f
x0)=ΔN
0/ΔN
x≈0
Can be found out by correlative value, adopt the measuring accuracy of the inventive method higher.
The present invention carries out measured signal and standard signal synchronously, process etc. precision, realize the stable accuracy of slow-speed shaft rotating speed, simultaneously with the rising edge of measured signal as the door capable of being opened lock with close the driving signal of a lock, thereby guarantee at actual measurement door lock in the time, measured signal is an integer cycle, avoided measured signal in traditional frequency measuring method ± error in 1 cycle, although the present invention can produce standard signal ± 1 circular error, but because the present invention can control the frequency of standard signal far above the frequency of measured signal, for example proportion produces standard signal at the crystal oscillator of 11M, can be far above the impulsive measurement scope (0rpm to 10 of wind-powered electricity generation generating unit speed
3Rpm), therefore standard signal ± error in 1 cycle is very limited on the impact of measuring accuracy, stage of measuring of the medium and low frequency under the wind power generating set rotating speed particularly, compared to traditional frequency measurement and period measurement means, the precision synchro measure such as of the present invention has improved measuring accuracy greatly, and in whole test frequency range, keep high precision constant, can not change because of the height of measured signal frequency.
In addition, frequency processing Software for Design of the present invention can adopt top-down modular construction mode, and each functional unit is divided into individual processing modules, is moved by the system software unified management.Software is mainly finished the functions such as frequency detecting, data operation, Communication processing.
The above; it only is preferred embodiment of the present invention; be not that the present invention is done any pro forma restriction, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (10)
1. the rotating speed measurement method of an aerogenerator is characterized in that may further comprise the steps:
A. preset gate lock signal, and generation full sized pules signal;
B. measure the measured pulse signal that wind power generating set is rotated;
C. working as a door lock signal is high level, and when the rising edge of measured pulse signal, begins respectively to measured pulse signal and full sized pules signal-count;
D. working as a door lock signal is low level, and when the rising edge of measured pulse signal, stops counting;
E. according to the count value of frequency, count value and the measured pulse signal of full sized pules signal, calculate the frequency of measured pulse signal;
F. according to frequency and the door lock time of measured pulse signal, calculate the rotating speed of wind power generating set.
2. the rotating speed measurement method of aerogenerator according to claim 1 is characterized in that among the described step B, the measured pulse signals collecting is from the slow-speed shaft of wind power generating set.
3. the rotating speed measurement method of aerogenerator according to claim 1; it is characterized in that after the described step F; also comprise the rotating speed of the wind power generating set of trying to achieve and the Design of Rotation threshold value of this unit are compared; when being judged as overspeed condition, output overspeed signal and starting protection pattern.
4. the rotating speed measurement method of aerogenerator according to claim 1 is characterized in that the frequency of described full sized pules signal is not less than 10MHz.
5. the rotating speed measurement method of aerogenerator according to claim 1 is characterized in that the length of described door lock signal is not less than 1s.
6. an application rights requires the speed measuring system of the aerogenerator of each described method among the 1-5, it is characterized in that comprising the impulsive measurement device of measuring the wind power generating set rotating speed and exporting the measured pulse signal, and to the precision such as the measured pulse signal carries out process and calculate etc. the precision frequency analyzing device;
The precision frequency analyzing device such as described is built-in or be circumscribed with the crystal oscillator that produces the full sized pules signal, and comprise counter I to the full sized pules signal-count, counter II to the measured pulse signal-count, the main door I of control counter I, the main door II of control counter II, and receiving gate lock signal and measured pulse signal, and according to the trigger of these signal controlling master door I, II synchronous opening/closing.
7. the speed measuring system of aerogenerator according to claim 6 is characterized in that the output terminal of the precision frequency analyzing device such as described also is connected with hypervelocity logical block and protection control module.
8. the speed measuring system of aerogenerator according to claim 6 is characterized in that described impulsive measurement device adopts IFM approach switch IGM200.
9. the speed measuring system of aerogenerator according to claim 6 is characterized in that described crystal oscillator adopts the 10MHz quartz oscillator.
10. the speed measuring system of aerogenerator according to claim 6 is characterized in that described counter I, II all adopt 32 high-speed counters.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106645785A (en) * | 2016-09-22 | 2017-05-10 | 北京京东尚科信息技术有限公司 | Device and method for measuring signal frequency of encoder, and operation detection device |
| CN106885998A (en) * | 2017-03-08 | 2017-06-23 | 中国地质大学（武汉） | A kind of Method and circuits for improving caesium pumped magnetic resonance signal frequency-measurement accuracy and speed |
| CN107013421A (en) * | 2017-06-12 | 2017-08-04 | 国电联合动力技术有限公司 | A kind of wind power generating set wheel speed measuring method and system |
| CN107436363A (en) * | 2017-06-30 | 2017-12-05 | 南京中车浦镇海泰制动设备有限公司 | A kind of rail traffic vehicles speed dynamic measurement method |
| CN112061919A (en) * | 2020-08-31 | 2020-12-11 | 杭州临安森源电缆有限公司 | Method for testing timing counter of elevator |
| CN112366996A (en) * | 2020-10-27 | 2021-02-12 | 唐山学院 | Method for realizing high-resolution rotation speed control based on rotation speed encoder |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106645785A (en) * | 2016-09-22 | 2017-05-10 | 北京京东尚科信息技术有限公司 | Device and method for measuring signal frequency of encoder, and operation detection device |
| CN106645785B (en) * | 2016-09-22 | 2020-07-31 | 北京京东振世信息技术有限公司 | Device and method for measuring encoder signal frequency and operation detection device |
| CN106885998A (en) * | 2017-03-08 | 2017-06-23 | 中国地质大学（武汉） | A kind of Method and circuits for improving caesium pumped magnetic resonance signal frequency-measurement accuracy and speed |
| CN106885998B (en) * | 2017-03-08 | 2023-07-11 | 中国地质大学（武汉） | Method and circuit for improving frequency measurement precision and speed of cesium optical pump magnetic resonance signals |
| CN107013421A (en) * | 2017-06-12 | 2017-08-04 | 国电联合动力技术有限公司 | A kind of wind power generating set wheel speed measuring method and system |
| CN107013421B (en) * | 2017-06-12 | 2023-11-14 | 国电联合动力技术有限公司 | Method and system for measuring rotation speed of impeller of wind generating set |
| CN107436363A (en) * | 2017-06-30 | 2017-12-05 | 南京中车浦镇海泰制动设备有限公司 | A kind of rail traffic vehicles speed dynamic measurement method |
| CN107436363B (en) * | 2017-06-30 | 2019-10-18 | 南京中车浦镇海泰制动设备有限公司 | A kind of rail traffic vehicles speed dynamic measurement method |
| CN112061919A (en) * | 2020-08-31 | 2020-12-11 | 杭州临安森源电缆有限公司 | Method for testing timing counter of elevator |
| CN112061919B (en) * | 2020-08-31 | 2022-04-22 | 杭州临安森源电缆有限公司 | Method for testing timing counter of elevator |
| CN112366996A (en) * | 2020-10-27 | 2021-02-12 | 唐山学院 | Method for realizing high-resolution rotation speed control based on rotation speed encoder |
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Application publication date: 20130417 |