CN102564626A - Method for measuring temperature of rotor of brushless exciter under real-time working condition - Google Patents
Method for measuring temperature of rotor of brushless exciter under real-time working condition Download PDFInfo
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- CN102564626A CN102564626A CN2012100250120A CN201210025012A CN102564626A CN 102564626 A CN102564626 A CN 102564626A CN 2012100250120 A CN2012100250120 A CN 2012100250120A CN 201210025012 A CN201210025012 A CN 201210025012A CN 102564626 A CN102564626 A CN 102564626A
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Abstract
The invention relates to a method for measuring the temperature of a rotor of a brushless exciter under the real-time working condition, which comprises the following steps of: by the existing subfunction relation of a specific exciting current value and a rotor voltage and a rotor resistance, which correspond to the specific exciting current value, of the existing brushless exciter, calculating to obtain a subfunction relation of a real-time exciting current value and a rotor voltage and a rotor resistance, which correspond to the real-time exciting current value, of the brushless exciter under the real-time working condition; and then deducing the temperature of the rotor of the brushless exciter under the real-time working condition by utilizing an iterative algorithm. According to the invention, the temperature of the rotor of the brushless exciter is measured by adopting an indirect mode, so that devices such as a detection coil, a measurement sliding ring and the like are avoided being arranged on a stator of the brushless exciter, a measuring device is simplified, the reliability of the equipment operation is greatly improved, the maintenance and overhaul workload is reduced, the thermal stress level of the rotor of the brushless exciter can also be monitored in real time, the temperature change rule in a rotor thermal stress zone in the actual operating process of a unit is more accurately known and reliable parameter information is provided for ensuring the safety operation of the generating unit.
Description
Technical field
The present invention relates to a kind of Generator Rotor Temperature measuring method, the rotor that is specifically related to a kind of brushless exciter is measured its method of temperature under full operating mode.
Background technology
Along with global energy is in an emergency; Human development cleaning, the heavy duty detergent energy are extremely urgent, and the nuclear power source utilization becomes still that we are one of essential instantly, and the million kilowatt unit will progressively become China electric power development main force unit; Also be the first-selected main force's units of current our nuclear power developing; So the safe and stable operation of high pressure high temperature turbosets is the important steps that concern the nuclear power safety in production, as one of most important parts of generator---rotor, because its work under bad environment; Stressed bigger; Therefore one of weak link of nuclear power 1,000,000 millions unit durabilities just can grasp the thermal stress level of machine group rotor in real time, is very important and significant to the safe and stable operation of nuclear power station.
Brushless excitation generator (brushless exciter) is a revolving-armature type alternator, and it and generator are unified into coaxial, and fairing also is installed on the generator amature, the coaxial rotation of the armature of exciter and generator amature.The advantage of this working method is to have cancelled the sliding contact of the big electric current that circulates, thus reliable, safeguard also more conveniently, saved space valuable in the factory building.But also bring some problems,, therefore can not extrapolate temperature of rotor through the corresponding relation of rotor resistance and temperature again according to drawing rotor resistance behind rotor voltage that obtains and the rotor current as can't directly measuring its rotor current and voltage.The producer that produces generator is when rotor dispatches from the factory; Can be provided at its rotor voltage and rotor resistance subfunction relational expression under the specific exciting current value according to the characteristic of this rotor; Temperature of rotor during like electric current 40A, 60A, 75A, rotor voltage that it is corresponding and rotor resistance subfunction relational expression are U=f (R) (U=AR for example
2+ BR+C; The A here, B, C flow down also inequality in different electric); But do not provide rotor corresponding rotor voltage and rotor resistance subfunction relational expression when any exciting current value; But nuclear power station on-the-spot exciting current be continually varying in full operating mode scope; Corresponding rotor voltage and rotor resistance functional relation when therefore needing a kind of analyzing and processing to obtain that the real-time exciting current value of brushless exciter changes under the full operating mode, and then the supervision of realization brushless exciter in the full operating mode scope of temperature of rotor.
Summary of the invention
For solving the temperature of rotor problem that can't directly measure brushless exciter in the prior art; The present invention provides a kind of and calculates the corresponding rotor voltage and the rotor resistance subfunction relational expression of real-time exciting current value of brushless exciter under the full operating mode according to available data, utilizes iterative algorithm to obtain the method for the temperature of rotor of brushless exciter again.Concrete scheme is following: the temperature of rotor measuring method of brushless exciter under a kind of real-time working condition, it is characterized in that, and comprise the steps:
Step 1, the specific exciting current value of obtaining brushless exciter and corresponding rotor voltage and rotor resistance subfunction relational expression thereof;
Step 2, with ascending ordering of all specific exciting current values, and two adjacent specific exciting current values are divided into a zone;
Step 3, obtain the current real-time exciting current value I of brushless exciter, and be divided in the zone that the specific exciting current value that is subordinate to forms according to the size of real-time exciting current value I;
Step 4, utilize following formula to obtain real-time exciting current value I corresponding rotor voltage and rotor resistance subfunction relational expression M:
α＝|I
j-I|/|I
(j+1)-I
j| (1)
β＝|I
(j+1)-I|/|I
(j+1)-I
j| (2)
M＝β×M
j+α×M
(j+1) (3)
I wherein
j, M
j, β is respectively little specific exciting current value in the zone, rotor voltage corresponding with it and rotor resistance subfunction relational expression, and the weight coefficient that concerns of this rotor voltage and rotor resistance subfunction; I
(j+1), M
(j+1), α is respectively big specific exciting current value in the zone, rotor voltage corresponding with it and rotor resistance subfunction relational expression, and the weight coefficient that concerns of this rotor voltage and rotor resistance subfunction;
Step 5, based on real-time exciting current value I and its corresponding rotor voltage and the rotor resistance subfunction relational expression M of brushless exciter, utilize the rotor temperature rise Δ T of brushless exciter
2And power P
ExLinear characteristic through iterative algorithm, obtains the rotor temperature rise Δ T of brushless exciter
2, with rotor temperature rise Δ T
2Add the initial temperature rise Δ T of brushless excitation machine rotor
0Promptly obtain the temperature of rotor of brushless exciter.
For reducing error: said step 2 at first will be carried out one by one corresponding with its rotor voltage and rotor resistance subfunction relational expression all specific exciting current values of brushless exciter.
Be the precision of improve calculating: dividing the method that real-time exciting current value I is subordinate to specific exciting current value zone in the said step 3 is: little specific exciting current value and when being less than or equal to big specific exciting current value in real-time exciting current value is regional greater than certain promptly puts this zone under.
Be the temperature of rotor value that needing to obtain: the iterative algorithm process in the said step 5 is:
R＝R
20×(235+T)/(235+20) (4)
P
ex＝(U
red)
2/(1000×R) (5)
ΔT
2＝ΔT
0+(δ/(1+P))×P
ex (6)
ΔT
1＝T-T
0 (7)
|ΔT
2-ΔT
1|＜ε (8)
In (8) formula | Δ T
2-Δ T
1|＞ε, then in (4), re-enter the T value and calculate again, up to | Δ T
2-Δ T
1| till＜the ε, wherein T is a temperature of rotor, the resistance when R representes T ℃, R
20Be its resistance in the time of 20 ℃, P
ExThe power of expression brushless exciter, Δ T
0Be initial temperature rise, δ is a temperature rise coefficient, and P is the Hydrogen Vapor Pressure of brushless exciter, Δ T
1Be the actual rotor temperature rise T ℃ time of the rotor of brushless exciter, ε is the different predefined temperature difference accurate values of nuclear power station field requirement, and difference is more little, then this result more near the temperature that will measure, T
0Cold wind temperature for brushless exciter.The present invention carries out area dividing with the specific exciting current value of known brushless exciter; Again measured real-time exciting current value is put under in the zone of corresponding specific exciting current value composition; Utilize the weight coefficient of specific exciting current value in the zone and respective rotor voltage and rotor resistance subfunction relational expression and relational expression thereof; Obtain the rotor voltage and the rotor resistance subfunction relational expression of real-time exciting current value, obtain the temperature of rotor of brushless exciter under the full operating mode again through iterative algorithm, broken through the bottleneck that the temperature of rotor of brushless exciter can't carry out on-line measurement; Solved the problem that the temperature of rotor of 1,000,000 grades of kilowatts of nuclear power station unit brushless exciters can't online in real time be measured; Adopt indirect mode to measure the temperature of rotor of brushless exciter, avoided on the stator of brushless exciter, installing devices such as detecting coil and measurement slip ring, simplified measuring process; Improved the reliability of equipment operation greatly; And having reduced the Maintenance and Repair workload, rotor thermal stress level that simultaneously can the real time monitoring brushless exciter is grasped the temperature changing regularity of unit in actual moving process rotor thermal stress section more accurately; For guaranteeing that unit safety operation provides reliable parameter information, very important and meaningful to the safe and stable operation of nuclear power station.
Description of drawings
Fig. 1 schematic flow sheet of the present invention.
Embodiment
Fig. 1 is the summary step explanation of this method:
101, obtain the specific exciting current value and the corresponding rotor voltage and the rotor resistance subfunction relational expression thereof of brushless exciter;
To every generator amature; Producer tests at the Shi Douhui that dispatches from the factory accordingly; To confirm some master datas, when being included in specific exciting current value, rotor voltage that it is corresponding and rotor resistance subfunction relational expression; Because this programme need be realized the temperature of rotor under the real-time working condition and measure; Therefore need utilize existing specific exciting current value, and corresponding rotor voltage and rotor resistance subfunction relational expression obtain the rotor voltage and the rotor resistance subfunction relational expression of real-time exciting current value under the real-time working condition and correspondence thereof, rotor producer is according to the characteristic of each rotor; Provide each generator amature in specific exciting current value rotor voltage pairing and rotor resistance subfunction relational expression with it; Therefore rotor voltage that each the specific exciting current value of current generator amature that at first producer is provided is corresponding with it and rotor resistance subfunction relational expression are carried out corresponding one by one, and correct to guarantee Data Matching, assurance obtains the accurate Calculation result.
102, after being sorted, all specific exciting current values divide two adjacent specific exciting current values into a zone;
If the specific exciting current value of current brushless exciter is I
1The time, rotor voltage that it is corresponding and rotor resistance subfunction relational expression are M
1, specific exciting current I
2The time corresponding rotor voltage and rotor resistance subfunction relational expression be M
2Specific exciting current value I
jThe time corresponding rotor voltage and rotor resistance subfunction relational expression be M
jSpecific exciting current value I
(j+1)The time corresponding rotor voltage and rotor resistance subfunction relational expression be M
(j+1)Specific exciting current value I
nThe time corresponding rotor voltage and rotor resistance subfunction relational expression be M
n, then all specific exciting current values are sorted according to from small to large order,
If: I
1＜I
2＜I
n
Simultaneously two adjacent specific exciting current values are divided into a zone, that is:
If A
0=[0, I
1], A
1=(I
1, I
2], A
j=(I
j, I
(j+1)] ... A
n=(I
n,+∞)
Here A
0, A
1, A
j..., A
nBe each zone.
103, obtain the real-time exciting current value of brushless exciter under the real-time working condition and put under in the zone that respective specific exciting current value forms by numerical values recited;
Obtain the real-time exciting current value of brushless exciter under the current working; Then with each zone in specific exciting current value compare; When real-time exciting current value greater than certain zone in the little specific exciting current value in the left side and be less than or equal on the right of during big specific exciting current value; Confirm that then this real-time exciting current value is subordinate to this zone, as:
If the exciting current value is I in real time, and I
j＜I≤I
(j+1), then the zone that is subordinate to of exciting current value I is A in real time
j=(I
j, I
(j+1)].
104, utilize the weight coefficient of specific exciting current value in the zone and corresponding rotor voltage thereof and rotor resistance subfunction relational expression to obtain the rotor voltage and the rotor resistance subfunction relational expression of real-time exciting current value;
If the exciting current value is I in real time, its specific exciting current value that is subordinate in the zone is respectively I
jAnd I
(j+1), then specific exciting current value I
jCorresponding rotor voltage and rotor resistance subfunction relational expression M
jWeight coefficient be β, specific exciting current value I
(j+1)Corresponding rotor voltage and rotor resistance subfunction relational expression M
(j+1)Weight coefficient be α, rotor voltage and rotor resistance subfunction relational expression that in real time exciting current value I is corresponding are M:
α＝|I
j-I|/|I
(j+1)-I
j| (1)
β＝|I
(j+1)-I|/|I
(j+1)-I
j| (2)
M＝β×M
j+α×M
(j+1) (3)
When promptly obtaining real-time exciting current value I according to above-mentioned formula, its rotor voltage U
RedSubfunction relational expression M with rotor resistance R.
105, utilize above-mentioned data to obtain the temperature of rotor of brushless exciter under the real-time working condition through iterative algorithm.
U during according to the real-time exciting current value I that obtains
RedThe subfunction relational expression corresponding with R is linear relation through rotor resistance R and temperature, thereby obtains U
Red(in a single day I, relational expression T) have promptly had input quantity I and T (temperature of rotor) to=f, just can calculate the voltage U of rotor
Red, the detailed calculated process is the formula of face as follows.
R＝R
20×(235+T)/(235+20) (4)
P
ex＝(U
red)
2/(1000×R) (5)
(4) and in (5) formula, T is a temperature of rotor, and R is the resistance of temperature of rotor when being T ℃, P
ExBe the power of brushless exciter this moment, R
20The rotor winding resistance of this brushless exciter when being 20 ℃, 235 is a coefficient under corresponding this temperature.
Again because the rotor temperature rise of brushless exciter and the power of brushless exciter are following linear relationship:
ΔT
2＝ΔT
0+(δ/(1+P))×P
ex (6)
(6) Δ T in the formula
0Be the initial temperature rise of the rotor of brushless exciter, δ is a temperature rise coefficient, and these two data are that producer obtains when this brushless excitation machine rotor is carried out performance test, and P is the Hydrogen Vapor Pressure (this real-time change value receives according to field instrument) of brushless exciter, Δ T
2Be the rotor temperature rise of brushless exciter when temperature of rotor is T, with this rotor temperature rise Δ T
2Add initial temperature rise Δ T
0The temperature of rotor of brushless exciter when promptly obtaining current real-time exciting current value and being I.
Be the degree of accuracy of checking temperature of rotor T, during the current brushless excitation generator temperature of rotor T that utilizes that producer provides and the relation of rotor temperature rise, as shown in the formula:
ΔT
1＝T-T
0 (7)
|ΔT
2-ΔT
1|＜ε (8)
Wherein T is a temperature of rotor, Δ T
0Be initial temperature rise, Δ T
1The actual value of the rotor temperature rise of brushless exciter when being T ℃ for temperature of rotor, T
0Be the cold wind temperature (this real time data is obtained by field instrument) of brushless exciter, ε is that the more little expression precision of difference is high more, with the Δ T in (6) formula according to the predefined temperature difference accurate values of different nuclear power station field requirement
2With Δ T
1Compare, when | Δ T
2-Δ T
1| during＞ε,, re-enter the T value, once more the Δ T that relatively obtains of cycle calculations by (4) formula according to aforementioned ratio
2, suppose that constantly initial temperature T iterates, result's precision of satisfying the demand and reaching to the last, promptly | Δ T
2-Δ T
1|＜ε, thus the purpose of the temperature of rotor of brushless exciter under the full operating mode is measured in realization.
Above content is to combine concrete optimal technical scheme to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.
Claims (4)
1. the temperature of rotor measuring method of brushless exciter under the real-time working condition is characterized in that, comprises the steps:
Step 1, the specific exciting current value of obtaining brushless exciter and corresponding rotor voltage and rotor resistance subfunction relational expression thereof;
Step 2, with ascending ordering of all specific exciting current values, and two adjacent specific exciting current values are divided into a zone;
Step 3, obtain the current real-time exciting current value I of brushless exciter, and be divided in the zone that the specific exciting current value that is subordinate to forms according to the size of real-time exciting current value I;
Step 4, utilize following formula to obtain real-time exciting current value I corresponding rotor voltage and rotor resistance subfunction relational expression M:
α＝|I
j-I|/|I
(j+1)-I
j| (1)
β＝|I
(j+1)-I|/|I
(j+1)-I
j| (2)
M＝β×M
j+α×M
(j+1) (3)
I wherein
j, M
j, β is respectively little specific exciting current value in the zone, rotor voltage corresponding with it and rotor resistance subfunction relational expression, and the weight coefficient that concerns of this rotor voltage and rotor resistance subfunction; I
(j+1), M
(j+1), α is respectively big specific exciting current value in the zone, rotor voltage corresponding with it and rotor resistance subfunction relational expression, and the weight coefficient that concerns of this rotor voltage and rotor resistance subfunction;
Step 5, based on real-time exciting current value I and its corresponding rotor voltage and the rotor resistance subfunction relational expression M of brushless exciter, utilize the rotor temperature rise Δ T of brushless exciter
2And power P
ExLinear characteristic through iterative algorithm, obtains the rotor temperature rise Δ T of brushless exciter
2, with rotor temperature rise Δ T
2Add the initial temperature rise Δ T of brushless excitation machine rotor
0Promptly obtain the temperature of rotor of brushless exciter.
2. the temperature of rotor measuring method of brushless exciter under a kind of real-time working condition according to claim 1; It is characterized in that said step 2 at first will be carried out one by one corresponding with its rotor voltage and rotor resistance subfunction relational expression all specific exciting current values of brushless exciter.
3. the temperature of rotor measuring method of brushless exciter under a kind of real-time working condition according to claim 1; It is characterized in that; Dividing real-time exciting current value I in the said step 3 is subordinate to the regional method of specific exciting current value and is: when real-time exciting current value greater than certain zone in little specific exciting current value and when being less than or equal to big specific exciting current value, promptly put this zone under.
4. the temperature of rotor measuring method of brushless exciter is characterized in that under a kind of real-time working condition according to claim 1, and the iterative algorithm process in the said step 5 is:
R＝R
20×(235+T)/(235+20) (4)
P
ex＝(U
red)
2/(1000×R) (5)
ΔT
2＝ΔT
0+(δ/(1+P))×P
ex (6)
ΔT
1＝T-T
0 (7)
|ΔT
2-ΔT
1|＜ε (8)
In (8) formula | Δ T
2-Δ T
1|＞ε, then in (4), re-enter the T value and calculate again, up to | Δ T
2-Δ T
1| till＜the ε, wherein T is a temperature of rotor, the resistance when R representes T ℃, R
20Be its resistance in the time of 20 ℃, P
ExThe power of expression brushless exciter, Δ T
0Be initial temperature rise, δ is a temperature rise coefficient, and P is the Hydrogen Vapor Pressure of brushless exciter, Δ T
1Be the actual rotor temperature rise T ℃ time of the rotor of brushless exciter, ε is the different predefined temperature difference accurate values of nuclear power station field requirement, and difference is more little, then this result more near the temperature that will measure, T
0Cold wind temperature for brushless exciter.
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|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100250120A CN102564626A (en) | 2012-02-06 | 2012-02-06 | Method for measuring temperature of rotor of brushless exciter under real-time working condition |
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Family
ID=46410650
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818658A (en) * | 2012-08-23 | 2012-12-12 | 联合汽车电子有限公司 | Fault diagnosis system for motor stator temperature sensor |
| CN103267587A (en) * | 2013-03-18 | 2013-08-28 | 国电南瑞科技股份有限公司 | Calculation method of temperature of rotor winding of large-size water-turbine generator set |
| CN107525823A (en) * | 2016-06-20 | 2017-12-29 | 新疆金风科技股份有限公司 | Monitor the pilot system of the magnetic pole temperature of permanent-magnetic wind driven generator |
| CN108919123A (en) * | 2018-08-20 | 2018-11-30 | 中车永济电机有限公司 | A kind of brushless excitation generator measuring device and its measurement method |
| CN116667745A (en) * | 2023-07-27 | 2023-08-29 | 大澳电器（江苏）有限公司 | Motor internal temperature display and control system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818658A (en) * | 2012-08-23 | 2012-12-12 | 联合汽车电子有限公司 | Fault diagnosis system for motor stator temperature sensor |
| CN102818658B (en) * | 2012-08-23 | 2016-03-30 | 联合汽车电子有限公司 | Motor stator temperature sensor fault diagnostic system |
| CN103267587A (en) * | 2013-03-18 | 2013-08-28 | 国电南瑞科技股份有限公司 | Calculation method of temperature of rotor winding of large-size water-turbine generator set |
| WO2014146422A1 (en) * | 2013-03-18 | 2014-09-25 | 国电南瑞科技股份有限公司 | Method for measuring and calculating temperature of rotor winding of large-sized water turbine generator set |
| CN107525823A (en) * | 2016-06-20 | 2017-12-29 | 新疆金风科技股份有限公司 | Monitor the pilot system of the magnetic pole temperature of permanent-magnetic wind driven generator |
| CN107525823B (en) * | 2016-06-20 | 2019-11-29 | 新疆金风科技股份有限公司 | Monitor the pilot system of the magnetic pole temperature of permanent-magnetic wind driven generator |
| CN108919123A (en) * | 2018-08-20 | 2018-11-30 | 中车永济电机有限公司 | A kind of brushless excitation generator measuring device and its measurement method |
| CN108919123B (en) * | 2018-08-20 | 2020-06-09 | 中车永济电机有限公司 | Brushless excitation generator measuring device and measuring method thereof |
| CN116667745A (en) * | 2023-07-27 | 2023-08-29 | 大澳电器（江苏）有限公司 | Motor internal temperature display and control system |
| CN116667745B (en) * | 2023-07-27 | 2023-10-03 | 大澳电器（江苏）有限公司 | Motor internal temperature display and control system |
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Address after: 100094 Yongfeng Road, Beijing, No., building 5, building 5 Applicant after: Beijing Guangli Nuclear Power Co., Ltd. Applicant after: China General Nuclear Power Corporation Address before: 100094 Yongfeng Road, Beijing, No., building 5, building 5 Applicant before: Beijing Guangli Nuclear Power Co., Ltd. Applicant before: China Guangdong Nuclear Power Group Co., Ltd. |
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Application publication date: 20120711 |