CN103671361A - Dead band property measuring device and method for steam turbine electro-hydraulic regulating system - Google Patents
Dead band property measuring device and method for steam turbine electro-hydraulic regulating system Download PDFInfo
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Abstract
The invention relates to a step-disturbance-based dead band property measuring device for a steam turbine electro-hydraulic regulating system. The device is characterized in that the device comprises a step disturbance signal generator, a working signal generator, a summator and a hydraulic servo-motor displacement detection module, the step disturbance signal generator and the working signal generator are connected to the summator, the summator is connected to a servo board PID module of the steam turbine electro-hydraulic regulating system, and the hydraulic servo-motor displacement detection module is connected to an opening degree governor valve through an LVDT module of the steam turbine electro-hydraulic regulating system. The invention further relates to a step-disturbance-based dead band property measuring method for the steam turbine electro-hydraulic regulating system with the adoption of the device. Measured dead band property results are not changed along with change of the rotating speed change rate, and the step-disturbance-based dead band property measuring device is more accurate compared with an existing measuring device.
Description
Technical field
The present invention relates to a kind of steam turbine electro-hydraulic governing system dead-band testing apparatus, especially relate to the static dead-band testing apparatus of a kind of steam turbine electro-hydraulic governing system based on frequency step disturbance.The invention still further relates to and use said apparatus to carry out the method for measuring of steam turbine electro-hydraulic governing system dead-band.
Background technique
The dead-band of steam turbine electro-hydraulic governing system refers in regulating system the slow movement degree that the insensitive factor due to each parts causes, and is the dead zone range of static characteristic curve maximum and the ratio of rated speed of practical adjustments system.In fact it represented the sensitivity of whole regulating system to the variable of its control, reflected the rotating speed control accuracy of system.Dead-band is one of most important quality index of regulating system, and dead-band is too large, can not maintain the major defects such as idle running after can causing regulating system vibration, removal of load.So in design, manufacture, installation and operation, all should make great efforts to make the dead-band of regulating system to reduce to minimum.Therefore dead-band, how to measure accurately regulating system is to actual production important in inhibiting.
Existence due to dead-band, in regulating system, increase and reduce in the process of rotating speed, the static characteristic curve of practical adjustments system is generally two lines, article one, be the characteristic line corresponding to rise of rotational speed process, another is the characteristic line corresponding to rotating speed decline process, article two, between line, have a ribbon dead band, current dead-band determining method is exactly by this band shape dead band, to calculate the dead-band of system.But in practical operation, find, the dead-band that the method is measured changes along with the speed of rise of rotational speed (or decline), can not reflect the actual dead-band of system, cannot break away from the dynamically impact on system dead-band.
The domestic rotating speed upstream and downstream ramp signal that generally utilizes is measured dead-band at present.The party's ratio juris is as follows:
By the curve negotiating coordinate mapping of fourth quadrant in steam turbine static characteristic curve and transposition conversion, can obtain pitch stroke-rotating speed (the △ s shown in Fig. 1
x-n) corresponding curve.In fact the dead-band of system has represented the sensitivity of whole regulating system to the variable of its control, for speed control system, the dead-band of rotating speed is exactly when the rotating speed of unit changes, and regulating system just starts action when which kind of degree is rotating speed deviation reach.
Now be defined as follows: generating unit speed is when minor variations occurs, and its amplitude of variation is △ n, and the extreme value that △ n determines under aperture at pitch is n
ε, at generating unit speed amplitude of variation △ n, surpass extreme value n
εtime, regulating system just starts response, changes pitch aperture and regulates, and has:
Wherein: the dead-band that ε is regulating system; n
0for steam turbine rated speed.Obviously, as long as obtained the micro-pole-changing value of rotating speed, just can successfully measure the dead-band of system.
The method is exactly to have utilized above-mentioned thought to measure the dead-band of system, and the method specific practice is as follows:
1) with a certain relative speed variation, constantly reduce turbine speed, reach after a certain value stabilized (steady-state) speed.
2) with same relative speed variation, constantly increase speed to initial value.
3) according to the data that obtain, draw Δ s
x-n curve.
4) utilize formula
obtain system dead-band.
The shortcoming of prior art: due in current determining method, to constantly change the rotating speed of steam turbine, therefore in system, there is all the time dynamic existence, this is not only with regard to the dead-band that has caused recording, and dead band by system causes, also have because determining method dynamically causing of bringing, can make like this dead-band that records bigger than normal than actual value, and the variance ratio of rotating speed is larger, the deviation that the result recording is compared actual value is just larger.
Summary of the invention
First technical problem to be solved by this invention, is just to provide a kind of steam turbine electro-hydraulic governing system dead-band testing apparatus based on step disturbance.
Second technical problem to be solved by this invention, is just to provide a kind of said apparatus that uses and carries out the steam turbine electro-hydraulic governing system dead-band method for measuring based on step disturbance.
Adopt apparatus and method of the present invention, can effectively solve the problem that dynamically can impact to dead-band measurement result of bringing due to rotation speed change in current determining method, the static dead-band of Accurate Determining steam turbine electro-hydraulic governing system.
Solve above-mentioned first technical problem, the technical solution used in the present invention is:
A kind of steam turbine electro-hydraulic governing system dead-band testing apparatus based on step disturbance, it is characterized in that: comprise step signal generator, working signal generator, adder and oil engine displacement detection module, described step signal generator and working signal generator are connected to respectively adder, adder is connected to the servo card PID module of steam turbine electro-hydraulic governing system, and oil engine displacement detection module is connected to pitch aperture through the LVDT of steam turbine electro-hydraulic governing system module (linear displacement transducer).
Described steam turbine electro-hydraulic governing system is servo card PID module, electro-control converter module, the oil engine module connecting successively, oil engine module controls pitch valve position be that pitch aperture returns to pitch instruction and oil engine displacement detection module through LVDT module converts.
Solve above-mentioned second technical problem, the technical solution used in the present invention is:
Use said apparatus to carry out the steam turbine electro-hydraulic governing system dead-band method for measuring based on step disturbance, it is characterized in that: comprise the following steps:
The S1 small step disturbance signal that superposes on the basis of electrohydraulic servo system working signal, the size of the amplitude of step disturbance signal is less than theoretical dead-band size;
S2, by constantly increasing the amplitude of step signal, observes the displacement signal of oil engine, and when oil engine displacement just changes, step signal amplitude is now exactly the dead-band of this steam turbine electro-hydraulic governing system.
This method principle:
From the essence of dead-band, dead-band refers to the minimum rotation speed change amount that can cause oil engine displacement.According to above-mentioned thought, propose herein, ramp signal is become to step signal, when this rotating speed step disturbance is less than the rotating speed deviation in system dead-band definition, will can there is not obvious action in oil engine; When this rotating speed step disturbance is greater than the rotating speed deviation in system dead-band definition, will there is obvious action in oil engine.By the size of continuous change step, in the mode of trying to gather, find the step signal size that just makes oil engine displacement change, this step value is the dead-band of system.
Beneficial effect: the steam turbine electro-hydraulic governing system dead-band testing apparatus based on step disturbance of the present invention, when detecting, without constantly changing the rotating speed of steam turbine, avoided the dead band of system and determining method on recording the impact of dead-band.The dead-band result that the present invention records does not change and changes with relative speed variation, more accurate than existing testing apparatus.
Dead-band determining method of the present invention is simple, than the method for current application, in mensuration process
There is not dynamic impact, can measure accurately the dead-band of electro-hydraulic control system.
Accompanying drawing explanation
Fig. 1 is pitch stroke-rotating speed (Δ s
x-n) corresponding plotted curve;
Fig. 2 is that frequency disturbance detects static dead-band schematic diagram;
Fig. 3 is the installation drawing that utilizes frequency disturbance to measure dead-band of the present invention.
In figure: 100-step signal generator, 200-working signal generator, 300-adder, 400-oil engine displacement detection module.
Embodiment
Fig. 1 is pitch stroke-rotating speed (△ s
x-n) corresponding plotted curve.
Referring to Fig. 2 and Fig. 3, steam turbine electro-hydraulic governing system dead-band testing apparatus embodiment based on step disturbance of the present invention, comprise step signal generator 100, working signal generator 200, adder 300 and oil engine displacement detection module 400, step signal generator and working signal generator are connected to respectively adder, adder is connected to the servo card PID module of steam turbine electro-hydraulic governing system, and oil engine displacement detection module is through the LVDT of steam turbine electro-hydraulic governing system module (LVDT: linear displacement transducer) be connected to pitch aperture; Steam turbine electro-hydraulic governing system is servo card PID module, electro-control converter module, the oil engine module connecting successively, and oil engine module controls pitch valve position be pitch aperture through LVDT module converts is returned to pitch instruction and oil engine displacement detection module.
In this device, right side is electrohydraulic servo system, and its internal structure as shown in fig. 1; This device left side be step signal to certain portions and oil engine displacement detection module.
100 parts are step signal generator, by this generator, export step signal, and can change the amplitude of step signal; 200 parts are working signal generator, are the working signal of electrohydraulic system input appointment by this generator; 300 parts are adder, and this part is input in electrohydraulic servo system after step signal and working signal are superposeed; 400 parts are oil engine displacement detection module, this part can detect the displacement situation of oil engine in electrohydraulic servo system, in this device, if this partial display oil engine displacement changes, show that the step amplitude of the output in 100 parts is the dead-band of this system.
Determining method as shown in Figure 1, the small step disturbance signal that superposes on the basis of electrohydraulic servo system working signal, the size of the amplitude of step disturbance signal should be less than theoretical dead-band size.By the amplitude of continuous increase step signal, observe the displacement signal of oil engine, when oil engine displacement just changes, step signal amplitude is now exactly the dead-band of this steam turbine electro-hydraulic governing system.
Claims (3)
1. the steam turbine electro-hydraulic governing system dead-band testing apparatus based on step disturbance, it is characterized in that: comprise step signal generator, working signal generator, adder and oil engine displacement detection module, described step signal generator and working signal generator are connected to respectively adder, adder is connected to the servo card PID module of steam turbine electro-hydraulic governing system, and oil engine displacement detection module is connected to pitch aperture through the LVDT of steam turbine electro-hydraulic governing system module.
2. the steam turbine electro-hydraulic governing system dead-band testing apparatus based on step disturbance according to claim 1, it is characterized in that: servo card PID module, electro-control converter module, the oil engine module of described steam turbine electro-hydraulic governing system for connecting successively, oil engine module controls pitch valve position be that pitch aperture returns to pitch instruction and oil engine displacement detection module through LVDT module converts.
Employing as claimed in claim 1 or 2 device carry out the steam turbine electro-hydraulic governing system dead-band method for measuring based on step disturbance, it is characterized in that: comprise the following steps:
The S1 small step disturbance signal that superposes on the basis of electrohydraulic servo system working signal, the size of the amplitude of step disturbance signal is less than theoretical dead-band size;
S2, by constantly increasing the amplitude of step signal, observes the displacement signal of oil engine, and when oil engine displacement just changes, step signal amplitude is now exactly the dead-band of this steam turbine electro-hydraulic governing system.
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Cited By (4)
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| CN104201953B (en) * | 2014-09-02 | 2016-08-17 | 东南大学 | Steam turbine output mechanical power control method in a kind of generating set |
| CN107237796A (en) * | 2017-06-29 | 2017-10-10 | 上海交通大学 | A kind of special servomotor performance testing device of Steam Turbine |
| CN107288954A (en) * | 2017-06-29 | 2017-10-24 | 上海交通大学 | A kind of special servomotor dynamic of Steam Turbine and static properties parameter test method |
| CN113341691A (en) * | 2021-05-20 | 2021-09-03 | 中铝中州铝业有限公司 | Steam turbine DEH system setting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201953B (en) * | 2014-09-02 | 2016-08-17 | 东南大学 | Steam turbine output mechanical power control method in a kind of generating set |
| CN107237796A (en) * | 2017-06-29 | 2017-10-10 | 上海交通大学 | A kind of special servomotor performance testing device of Steam Turbine |
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| CN113341691B (en) * | 2021-05-20 | 2022-08-12 | 中铝中州铝业有限公司 | Steam turbine DEH system setting method |
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Application publication date: 20140326 |