CN105277348A - Method for measuring inherent frequency of stator core/support system of water turbine generator prototype - Google Patents
Method for measuring inherent frequency of stator core/support system of water turbine generator prototype Download PDFInfo
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- CN105277348A CN105277348A CN201510658132.8A CN201510658132A CN105277348A CN 105277348 A CN105277348 A CN 105277348A CN 201510658132 A CN201510658132 A CN 201510658132A CN 105277348 A CN105277348 A CN 105277348A
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Abstract
The invention discloses a method for measuring the inherent frequency of a stator core/support system of a water turbine generator prototype. Through arrangement of an automatic excitation regulator, the terminal voltage of a hydropower unit is kept at a rated value. By setting a given value of the zero load frequency, the method changes the rotational speed of a generator rotor. Thereby the method changes an excitation input of the stator core/support system, i.e. the generator rotor rotation magnetic field force wave rotational speed, and measures a frequency response function of the stator core/support system of the water turbine generator prototype under electromagnetic force excitation of different frequency. According to the frequency response function, a frequency value corresponding to the maximum amplitude can be found, and the frequency value is the inherent frequency of the stator core/support system of the water turbine generator prototype. The method only needs to stop the generator and install a sensor, does not need to apply for heavy maintenance, is simple and convenient in measurement, and thus has a wide application prospect in the field of inherent frequency measurement of stator core/support systems of water turbine generator sets.
Description
Technical field
The present invention relates to a kind of hydrogenerator structural natural frequencies measuring method, be specifically related to a kind of hydrogenerator prototype stator core-support system frequency measuring method.
Background technology
Of a great variety, the complex structure of hydrogenerator in engineering practice.The structure that the unit of different capabilities adopts is different, and such as large-scale or large rubber good, often rotor adopts oblique support arm structure, stator adopts oblique stud structure, and some machine group rotors adopt case type structures, out frame to adopt radial spoke emitting stud.The problem that Large Hydroelectric Set iron core-out frame vibration is bigger than normal, need to measure stator core and stator core-out frame natural frequency is often there is in engineering practice.The natural frequency measuring method of existing structure mainly contains: hammering method and resonant method.Can be measured the natural frequency of out frame in theory by Hammering Test, but for the turbine-generator units of macrostructure size, hammering method has the following disadvantages: (1) needs to install large quantity sensor; (2) need repeatedly local peening to test, be difficult to the natural frequency of disposable perfect measurement stator core-out frame system; (3) the overall natural frequency of stator core measures difficulty, major overhaul must be applied for, and the turbine-generator units time between overhaul longer (about 8 years ~ 10 years), occur will to face the choice carrying out overhaul whether in advance when vibration is bigger than normal when between two-wheeled overhaul time.And resonant method needs to provide broad and significantly power, the method is difficult to carry out.Therefore, need a kind of Novel generator stator iron core-out frame natural frequency measuring method in engineering reality badly, for diagnosing turbine-generator units stator vibration problem in time, judge whether that resonance occurs, whether should enter overhaul in advance technology decision-making support is provided.
Summary of the invention
The object of patent of the present invention is to provide a kind of Large Hydroelectric Set stator core-out frame natural frequency measuring method, it solve conventional stator iron core-out frame natural frequency measure the used time existed longer, the problems such as overhaul, point layout are many must be applied for.
A kind of hydrogenerator prototype stator core-support system frequency measuring method, comprises the following steps:
Step 1: test measuring point sensor installation;
The sensor that described test measuring point is installed comprises acceleration transducer and vibration displacement sensor, is installed on out frame stud;
Step 2: the operating condition of hydrogenerator unit is adjusted to zero load;
Step 3: when being optimized parameter according to speed regulator idle condition pid control parameter, speed regulator frequency set-point is set, changes generator amature rotating speed;
When described idle condition pid control parameter is optimized parameter, meet idle condition unit frequency jitter≤± 1.5% rated frequency;
Described idle condition speed regulator frequency set-point is arranged, and meets unit set end voltage and is not less than no-load voltage minimum, and be not more than no-load voltage mxm.;
Step 4: set gradually the sensor sample frequency that test measuring point is installed from high to low, and pick-up transducers signal, obtain electricity generator stator core-out frame response function;
Wherein, the horizontal ordinate of electricity generator stator core-out frame response function is followed successively by 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 97%, 98%, 99%, 100%, 101%, 102%, 103%, 104%, 106% and 108% of hydrogenerator unit rated speed, and ordinate is the peak-to-peak value of electricity generator stator stand vibration acceleration signal under corresponding operating point, vibration displacement signal;
Step 5: the frequency that maximum peak peak value is corresponding in electricity generator stator core-out frame response function is as the natural frequency of electricity generator stator core-out frame.
Described acceleration transducer and vibration displacement sensor are arranged at the upper, middle and lower-ranking of out frame stud;
Upper strata, middle level and lower floor all along the circumferential direction evenly arrange 4 measuring points, and each measuring point arranges 1 acceleration transducer and 1 vibration displacement sensor simultaneously;
And the top ring flat-plate of out frame arranges 4 measuring points along vertical circular circumferential direction, each point layout 1 acceleration transducer.
When described idle condition speed regulator frequency set-point is arranged, meet unit set end voltage and be not less than no-load voltage minimum, and be not more than no-load voltage mxm.;
Described no-load voltage minimum is 80% generator terminal voltage;
Described no-load voltage mxm. is 105% generator terminal voltage.
Beneficial effect
The invention provides a kind of hydrogenerator prototype stator core-support system frequency measuring method, the method can be widely used in the hydrogenerator of different size.The vibration of hydrogenerator is subject to the combined influence of waterpower, machinery, electromagnetic factors, the ultimate principle that this method measures the natural frequency of hydrogenerator prototype stator core-support system measures the frequency response function of iron core-stator system, due to waterpower, mechanical factor exciting force not malleable, and hydrogenerator bears electromagnetic force by power generator air gap magnetic field determines, the rotational speed of air-gap field depends on the rotating speed of prime mover, and the rotating speed of prime mover is controlled by speed regulator, therefore change electromagnetic force frequency relatively easy.According to this principle, the set end voltage of Hydropower Unit is maintained ratings by arranging automatic exciting regulator by the present invention, by arranging speed regulator idling frequency set-point, change generator amature rotational speed, realize changing stator core-support system incentive input-generator amature rotating magnetic field Reeb speed-frequency, the frequency response function of hydrogenerator prototype stator core-support system under measurement different frequency electromagnetic force exciting.According to frequency response function, find out the frequency values that peak swing is corresponding, this frequency values is the natural frequency of hydrogenerator prototype stator core-support system.
Compared with traditional measuring method, this method point layout facilitates, measure processing ease, need not apply for that unit enters overhaul, can judge whether turbine-generator units resonates, whether should enter overhaul in advance for vibration unit bigger than normal in time and technology decision-making support is provided, bring remarkable safety and economy benefit to power plant.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method for the invention;
Fig. 2 is test point layout schematic diagram, and wherein, (a) is overall schematic, and (b) is middle aspect point layout schematic diagram, and (c) is generator unit stator vibration point layout schematic diagram;
Fig. 3 is electricity generator stator stand upper strata circumferentially 4 some vibration acceleration random groups frequency change trend schematic diagram;
Fig. 4 is electricity generator stator stand middle level circumferentially 4 some vibration acceleration random groups frequency change trend schematic diagram;
Fig. 5 is electricity generator stator stand upper strata axially 2 some vibration acceleration random groups frequency change trend schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
As shown in Figure 1, a kind of hydrogenerator prototype stator core-support system frequency measuring method, comprises the following steps:
Step 1: test measuring point sensor installation;
The sensor that described test measuring point is installed comprises acceleration transducer and vibration displacement sensor, is installed on out frame stud;
Step 2: the operating condition of hydrogenerator unit is adjusted to zero load;
Step 3: when being optimized parameter according to speed regulator idle condition pid control parameter, speed regulator frequency set-point is set, changes generator amature rotating speed;
When described idle condition pid control parameter is optimized parameter, meet idle condition unit frequency jitter≤± 1.5% rated frequency;
Described idle condition speed regulator frequency set-point is arranged, and meets unit set end voltage and is not less than no-load voltage minimum, and be not more than no-load voltage mxm.;
Step 4: set gradually the sensor sample frequency that test measuring point is installed from high to low, and pick-up transducers signal, obtain electricity generator stator core-out frame response function;
Wherein, the horizontal ordinate of electricity generator stator core-out frame response function is followed successively by 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 97%, 98%, 99%, 100%, 101%, 102%, 103%, 104%, 106% and 108% of hydrogenerator unit rated speed, and ordinate is the peak-to-peak value of electricity generator stator stand vibration acceleration signal under corresponding operating point, vibration displacement signal;
A large amount of site test shows, the meter full scale that each factory allows is different, and when arranging according to above-mentioned meter full scale in conditions permit situation, low restriction, watt warm ability to bear and the overspeed protection of encouraging that actual conditions should be arranged according to each power plant suitably regulates meter full scale.
Step 5: the frequency that maximum peak peak value is corresponding in electricity generator stator core-out frame response function is as the natural frequency of electricity generator stator core-out frame.
Described acceleration transducer and vibration displacement sensor are arranged at the upper, middle and lower-ranking of out frame stud;
Upper strata, middle level and lower floor all along the circumferential direction evenly arrange 4 measuring points, and each measuring point arranges 1 acceleration transducer and 1 vibration displacement sensor simultaneously;
And the top ring flat-plate of out frame arranges 4 measuring points along vertical circular circumferential direction, each point layout 1 acceleration transducer.
When described idle condition speed regulator frequency set-point is arranged, meet unit set end voltage and be not less than no-load voltage minimum, and be not more than no-load voltage mxm.;
Described no-load voltage minimum is 80% generator terminal voltage;
Described no-load voltage mxm. is 105% generator terminal voltage.
The method is applied to engineering reality.In certain power station generator operational process, noise is comparatively large, stands on cover plate of generator significantly to feel " numb pin " phenomenon, tests this Generator Vibration according to the method for this reason.
In engineering reality, Fig. 2 is shown in by point layout schematic diagram; The Acceleration pulse of engineering measurement is shown in Fig. 3-Fig. 5 with rotation speed change, and in Fig. 3-Fig. 5, ordinate gets acceleration signal, and with g (9.8m/s
2) be measurement unit, as can be seen from the figure, in upper two planes, No. 2 measuring point vibrations are accelerated obviously bigger than normal, and especially near 92% rated speed, radial acceleration is more than 10g, and axial vertical vibration acceleration is up to 30g.In conjunction with before the service data of this generator, the Acceleration pulse of comprehensive each measuring point is inferred, this electricity generator stator core may loosen, and causes generator pit natural mode of vibration to change, to such an extent as to produces resonance; Consider that this electricity generator stator stand is distinguish support, tentatively can judge that loosening iron core maximum possible occurs in No. 2 measuring point parts.This method and site test results is demonstrated afterwards according to unit maintenance situation.
Claims (3)
1. hydrogenerator prototype stator core-support system frequency measuring method, is characterized in that, comprise the following steps:
Step 1: test measuring point sensor installation;
The sensor that described test measuring point is installed comprises acceleration transducer and vibration displacement sensor, is installed on out frame stud;
Step 2: the operating condition of hydrogenerator unit is adjusted to zero load;
Step 3: when being optimized parameter according to speed regulator idle condition pid control parameter, speed regulator frequency set-point is set, changes generator amature rotating speed;
When described idle condition pid control parameter is optimized parameter, meet idle condition unit frequency jitter≤± 1.5% rated frequency;
Described idle condition speed regulator frequency set-point is arranged, and meets unit set end voltage and is not less than no-load voltage minimum, and be not more than no-load voltage mxm.;
Step 4: set gradually the sensor sample frequency that test measuring point is installed from high to low, and pick-up transducers signal, obtain electricity generator stator core-out frame response function;
Wherein, the horizontal ordinate of electricity generator stator core-out frame response function is followed successively by 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 97%, 98%, 99%, 100%, 101%, 102%, 103%, 104%, 106% and 108% of hydrogenerator unit rated speed, and ordinate is the peak-to-peak value of electricity generator stator stand vibration acceleration signal under corresponding operating point, vibration displacement signal;
Step 5: the frequency that maximum peak peak value is corresponding in electricity generator stator core-out frame response function is as the natural frequency of electricity generator stator core-out frame.
2. method according to claim 1, is characterized in that, described acceleration transducer and vibration displacement sensor are arranged at the upper, middle and lower-ranking of out frame stud;
Upper strata, middle level and lower floor all along the circumferential direction evenly arrange 4 measuring points, and each measuring point arranges 1 acceleration transducer and 1 vibration displacement sensor simultaneously;
And the top ring flat-plate of out frame arranges 4 measuring points along vertical circular circumferential direction, each point layout 1 acceleration transducer.
3. method according to claim 2, is characterized in that, when described idle condition speed regulator frequency set-point is arranged, meets unit set end voltage and is not less than no-load voltage minimum, and be not more than no-load voltage mxm.;
Described no-load voltage minimum is 80% generator terminal voltage;
Described no-load voltage mxm. is 105% generator terminal voltage.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106895971A (en) * | 2017-04-12 | 2017-06-27 | 北京航空航天大学 | A kind of method for measuring slender axles rotor internal damping |
| CN111488690A (en) * | 2020-04-16 | 2020-08-04 | 云南电网有限责任公司电力科学研究院 | Method for optimizing no-load adjustment parameters of speed regulator of impact type hydraulic generator |
| CN112491228A (en) * | 2020-11-06 | 2021-03-12 | 华能澜沧江水电股份有限公司 | Method for detecting key magnetic pole causing stator low-frequency vibration based on vibration waveform |
| CN112484946A (en) * | 2020-10-28 | 2021-03-12 | 哈尔滨电机厂有限责任公司 | Method for testing inherent frequency of multi-rubber die-pressing main insulation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106895971A (en) * | 2017-04-12 | 2017-06-27 | 北京航空航天大学 | A kind of method for measuring slender axles rotor internal damping |
| CN106895971B (en) * | 2017-04-12 | 2018-04-06 | 北京航空航天大学 | A kind of method for measuring slender axles rotor internal damping |
| CN111488690A (en) * | 2020-04-16 | 2020-08-04 | 云南电网有限责任公司电力科学研究院 | Method for optimizing no-load adjustment parameters of speed regulator of impact type hydraulic generator |
| CN111488690B (en) * | 2020-04-16 | 2023-09-19 | 云南电网有限责任公司电力科学研究院 | Optimization method for no-load adjustment parameters of speed regulator of impact hydraulic generator |
| CN112484946A (en) * | 2020-10-28 | 2021-03-12 | 哈尔滨电机厂有限责任公司 | Method for testing inherent frequency of multi-rubber die-pressing main insulation |
| CN112491228A (en) * | 2020-11-06 | 2021-03-12 | 华能澜沧江水电股份有限公司 | Method for detecting key magnetic pole causing stator low-frequency vibration based on vibration waveform |
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