WO2014146422A1 - Procédé pour mesurer et calculer une température d'enroulement de rotor d'un groupe électrogène à turbine hydraulique de grande dimension - Google Patents

Procédé pour mesurer et calculer une température d'enroulement de rotor d'un groupe électrogène à turbine hydraulique de grande dimension Download PDF

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Publication number
WO2014146422A1
WO2014146422A1 PCT/CN2013/084963 CN2013084963W WO2014146422A1 WO 2014146422 A1 WO2014146422 A1 WO 2014146422A1 CN 2013084963 W CN2013084963 W CN 2013084963W WO 2014146422 A1 WO2014146422 A1 WO 2014146422A1
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WO
WIPO (PCT)
Prior art keywords
temperature
rotor
resistance
rotor winding
winding
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Application number
PCT/CN2013/084963
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English (en)
Chinese (zh)
Inventor
许其品
袁亚洲
刘光权
耿敏彪
朱宏超
徐其质
安宁
王亚婧
万泉
仇志刚
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国电南瑞科技股份有限公司
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Application filed by 国电南瑞科技股份有限公司 filed Critical 国电南瑞科技股份有限公司
Publication of WO2014146422A1 publication Critical patent/WO2014146422A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/04—Thermometers specially adapted for specific purposes for measuring temperature of moving solid bodies
    • G01K13/08—Thermometers specially adapted for specific purposes for measuring temperature of moving solid bodies in rotary movement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K2217/00—Temperature measurement using electric or magnetic components already present in the system to be measured

Definitions

  • the invention provides a method for improving the calculation accuracy of the resistance of the rotor winding by optimizing the linear coefficient of the resistance of the rotor winding and the temperature, reasonably selecting the measuring point, considering the influencing factors of the outer loop, and considering the rotor voltage and the rotor current.
  • the sampling is performed by filtering and fault tolerance, and belongs to the field of electrical engineering.
  • the temperature of the large generator rotor is an important monitoring parameter for the safe operation of the generator.
  • the measurement methods include direct measurement method and indirect measurement method.
  • the direct measurement method is more reliable, but the implementation is more difficult, and the equipment is safely operated and repaired. Adding new difficulties.
  • the basic principle of the indirect measurement method is based on the resistance temperature characteristics of the copper conductor. Since the real-time monitoring values of the excitation voltage and the excitation current are required, the method of using the excitation software to calculate the rotor winding temperature has been widely used, and its implementation is relatively easy. No special maintenance is required.
  • the implementation of this method requires a linear coefficient of resistance and temperature, as well as real-time samples of the excitation voltage and excitation current, where the calculation of the linear coefficient is mostly achieved by absolute zero and the maximum temperature of the winding or the resistance at full load.
  • the sampling, algorithm, and output link errors all cause inaccurate temperature calculations. Therefore, improving the accuracy of sampling, calculation, and output is related to accurate measurement of rotor winding temperature.
  • the technical problem to be solved by the invention is to improve from sampling, algorithm and output simultaneously.
  • a method for calculating a rotor winding temperature of a large hydroelectric generating set characterized in that: the following steps are included:
  • the foregoing method for calculating the rotor winding temperature of a large hydro-generator set is characterized in that: in the step (1): pre-measuring the rotor rotor winding shutdown state temperature 7 ⁇ port idling temperature ⁇ and the corresponding rotor resistance Value and, using the measured value according to the formula ⁇ _ ⁇ 2 _ ⁇
  • the foregoing method for calculating the rotor winding temperature of a large hydro-generator set is characterized in that: in the step (2): the resistance value of the rotor is calculated by sampling the excitation voltage and the excitation current, and is subtracted in the calculation.
  • the external loop resistance is characterized in that: in the step (2): the resistance value of the rotor is calculated by sampling the excitation voltage and the excitation current, and is subtracted in the calculation. The external loop resistance.
  • the foregoing method for calculating the rotor winding temperature of a large hydro-generator set is characterized in that: the excitation phase of the rotor excitation voltage and the excitation current of the rotor are fault-tolerant, and the rotor is excited.
  • the voltage is calculated by the trigger angle and the anode voltage.
  • the voltage is sampled three times in one sampling period, and the third time is used as a referee function.
  • the first and second samples are fault-tolerant, and the third time is selected.
  • the value of the rotor excitation voltage needs to be filtered to avoid the instantaneous jitter of the rotor voltage during operation or the interference jitter of the measurement link, which brings errors to the measurement of the rotor resistance; the current sampling fault tolerance is to compare whether the two measurement channels are similar. If it is not similar, it is compared with the theoretical value, and if it is close to the theoretical value, the theoretical value is calculated by the active reactive power and the terminal voltage.
  • the foregoing method for calculating the rotor winding temperature of a large hydro-generator set is characterized in that: when measuring the rotor resistance of the rotor winding of the generator, the resistance of the rotor winding of the generator is measured at the connection between the slip ring and the rotor winding, On the outgoing side of the generator DC magnetic circuit breaker
  • the foregoing method for calculating the rotor winding temperature of a large hydro-generator set is characterized in that: in the step (3): theoretically, the critical temperature of copper entering the superconducting state is close to an absolute zero-273 ° C, but actually -234.
  • the resistance of the copper conductor is very small at 5 °C, so the industrial calculation takes -234.
  • 5 °C is the zero resistance temperature of the copper conductor, that is, the intersection of the linear extension line and the abscissa in Figure 1, by the rotor winding
  • T f K x R f -K 2 (D where ⁇ - rotor winding temperature
  • the calculation of the resistance of the rotor winding takes into account the influence of the external loop, and the calculation is more accurate.
  • the resistance of the rotor winding at normal temperature is measured from the connection of the rotor slip ring.
  • the calculation of the linear coefficient of the rotor winding temperature and resistance is more accurate.
  • the rotor temperature at ambient temperature and no-load state is selected to calculate the coefficient.
  • the measurement of excitation voltage and excitation current of the rotor has filtering and fault tolerance. At the same time, the output result also needs to be fault-tolerant. If it does not meet the linear ratio, if the deviation of the temperature and current set by the parameter is too much, re-pair The voltage and current are sampled or rounded off.
  • the present invention corrects the fault-tolerant and calculation method for calculating the rotor temperature-related parameters, so that the rotor winding temperature is closer to the actual value, reflecting the actual heat generation of the rotor winding.
  • DRAWINGS Figure 1 is a graph showing the relationship between copper conductor resistance and temperature in the present invention.
  • Figure 2 is a schematic diagram of the rotor circuit of the present invention.
  • Figure 3 is a logic diagram of rotor voltage sampling tolerance and filtering.
  • Figure 1 is a graph showing the relationship between the resistance of a copper conductor and its temperature. It can be seen that at normal temperature (except for high temperature and very low temperature), the resistance of the copper conductor has a good linear relationship with its temperature, which is approximately straight, and its slope depends on copper. The size and structure of the conductor. The characteristics of the copper material determine that the resistance temperature characteristic line of any copper conductor passes through the point ( _234 ⁇ 5 , 0) in Figure 1 ( according to the relationship diagram of Figure 1, as long as the slope of the rotor winding resistance temperature characteristic line is obtained, Calculate the resistance value of the rotor at a certain temperature, and then calculate the corresponding rotor temperature value.
  • the temperature of the rotor in the normal temperature state and the operating state and its corresponding resistance value and the resistance value are measured, that is, the two points and the slope of the temperature characteristic line in Fig. 1 can be determined. According to the equal slope, other points on the characteristic line ( 7 , ⁇ are satisfied:
  • the calculation of ⁇ ' can enter the rotor winding temperature and resistance through the normal temperature state.
  • Figure 2 shows the rotor circuit schematic
  • the excitation regulator is added with a millivolt signal generator to calibrate the excitation voltage and the excitation current respectively.
  • the DC magnetic circuit breaker of the generator is disconnected, and the cable at point A is uncoupled to disconnect the de-excitation resistor.
  • Two WHM-5 type digital display wet and dry thermometers are placed on the rotor pole of the generator upper wind tunnel, and the average temperature is taken as the generator rotor winding ambient temperature.
  • JYR-10 type transformer DC resistance fast tester is used in the slip ring and rotor winding.
  • the connection point ie, points B and C in Figure 2 is used to measure the resistance of the generator rotor winding.
  • the generator with the external circuit is measured on the outgoing side of the generator DC magnetic circuit breaker (ie, at points 0 and E in Figure 2).
  • Rotor winding resistance + Rl The rotor is heated by the excitation and excitation method.
  • the temperature of the rotor end is measured from the top of the generator rotor by the infrared point temperature gun. When the temperature reaches (between 50 and 70 degrees), the excitation current is removed, and the excitation current is immediately removed.
  • the power cabinet outlet measures the rotor loop resistance ⁇ ; Similarly, the same method can be used to measure another temperature measurement point as redundant fault tolerance.
  • the linear coefficient of temperature and resistance is determined by the two points of the loop resistance at normal temperature and the normal state of the shutdown state.
  • the two points are determined by a line, and the contact resistance of the slip ring is opposite to the rotor.
  • the critical temperature of copper entering the superconducting state is close to the absolute zero -273 ° C, but in fact the resistance of the copper conductor has been extremely small at -234.5 ° C, so in the industrial calculation, take -234.5 ° C as the zero resistance of the copper conductor.
  • the temperature that is, the intersection of the linear extension line and the abscissa in Figure 1, the zero resistance temperature determined by the copper material of the rotor winding is 234.5, but considering the existence of the contact resistance of the slip ring, the calculated rotor temperature is slightly smaller than the actual value. High, so take ⁇ 235 ⁇ 1 to offset this error.
  • the rotor excitation voltage is obtained: Ul, U2, U3 are three rotor excitation voltages taken within 20ms of one sampling period.
  • the first two acquisitions of the excitation voltage Ul, U2, when the difference does not exceed 5% U1, U1 is selected and then used as the rotor voltage after the filtering step.
  • the first two acquisitions of the excitation voltage Ul, U2 in the case of a difference of more than 5% U1, select the voltage in Ul, U2 and the third sample U3 and then pass the filter step as the rotor voltage.
  • the rotor excitation current sampling tolerance and filtering are the same as the rotor excitation voltage.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

L'invention porte sur un procédé pour mesurer et calculer une température d'un enroulement de rotor d'un groupe électrogène à turbine hydraulique de grande dimension, qui comprend les étapes suivantes : (1) mesurer séparément une température d'un enroulement de rotor, dans un état d'arrêt et un état de charge nulle, d'une génératrice ainsi que de l'enroulement de rotor, et calculer pour obtenir la température de l'enroulement de rotor et un coefficient linéaire d'une résistance ; (2) obtenir, par échantillonnage, des valeurs d'échantillonnage en temps réel d'une tension d'excitation et d'un courant d'excitation pour obtenir une valeur de résistance de l'enroulement de rotor ; et (3) multiplier une valeur de résistance en temps réel de l'enroulement de rotor par la température de l'enroulement de rotor et le coefficient linéaire de la résistance, et soustraire une température de résistance nulle pour obtenir la température de l'enroulement de rotor. La mesure d'une tension de rotor et d'un courant de rotor a une fonction de filtrage et un mécanisme tolérant aux défauts, et un procédé de calcul de coefficient linéaire d'une résistance de rotor et d'une température de rotor est optimisé, et le calcul de la valeur de résistance de l'enroulement de rotor est plus proche d'une valeur réelle ; de plus, l'influence d'une perte de pression de bague glissante et d'une perte de pression de bus lors du calcul d'une température de rotor sont considérées comme permettant d'obtenir la température calculée du rotor plus proche d'une température réelle, en améliorant ainsi la précision de la mesure et du calcul de température d'un rotor.
PCT/CN2013/084963 2013-03-18 2013-10-10 Procédé pour mesurer et calculer une température d'enroulement de rotor d'un groupe électrogène à turbine hydraulique de grande dimension WO2014146422A1 (fr)

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Application Number Priority Date Filing Date Title
CN2013100870359A CN103267587A (zh) 2013-03-18 2013-03-18 一种大型水轮发电机组转子绕组温度的测算方法
CN201310087035.9 2013-03-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3260874A1 (fr) * 2016-06-21 2017-12-27 General Electric Company Systèmes et procédés pour déterminer la détérioration de rotor d'une machine dynamoélectrique

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103267587A (zh) * 2013-03-18 2013-08-28 国电南瑞科技股份有限公司 一种大型水轮发电机组转子绕组温度的测算方法
CN104101442A (zh) * 2014-07-17 2014-10-15 贵阳新光电气有限公司 发电机转子绕组温度在线监测方法
CN105115620B (zh) * 2015-07-15 2018-11-06 日立楼宇技术（广州）有限公司 三相同步门电机的绕组温度检测、及过热保护方法和系统
CN108458812B (zh) * 2017-02-20 2020-11-17 南京天擎汽车电子有限公司 电机绕组温度的获取方法和获取装置

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EP2108930A1 (fr) * 2008-04-09 2009-10-14 VARIAN S.p.A. Dispositif de mesure sans contact de paramètres de rotors de machines ayant une grande vitesse de rotation
DE102008040725A1 (de) * 2008-07-25 2010-01-28 Robert Bosch Gmbh Verfahren und Vorrichtung zur Ermittlung der Rotortemperatur einer permanenterregten Synchronmaschine
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CN102661812A (zh) * 2012-05-15 2012-09-12 无锡艾柯威科技有限公司 一种提高电机绕组温度检测精度的方法
CN202563072U (zh) * 2012-03-02 2012-11-28 北京理工大学 电机绕组温升测试系统
CN103267587A (zh) * 2013-03-18 2013-08-28 国电南瑞科技股份有限公司 一种大型水轮发电机组转子绕组温度的测算方法

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US4083001A (en) * 1976-12-29 1978-04-04 Westinghouse Electric Corporation Measurement of motor winding temperature
EP2108930A1 (fr) * 2008-04-09 2009-10-14 VARIAN S.p.A. Dispositif de mesure sans contact de paramètres de rotors de machines ayant une grande vitesse de rotation
DE102008040725A1 (de) * 2008-07-25 2010-01-28 Robert Bosch Gmbh Verfahren und Vorrichtung zur Ermittlung der Rotortemperatur einer permanenterregten Synchronmaschine
CN101382458B (zh) * 2008-10-16 2010-11-10 西安理工大学 基于转子温度场模拟计算的电站锅炉空预器热点检测方法
CN101915623A (zh) * 2010-06-30 2010-12-15 上海电气电站设备有限公司 一种无刷励磁发电机转子温度测算方法
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CN202563072U (zh) * 2012-03-02 2012-11-28 北京理工大学 电机绕组温升测试系统
CN102661812A (zh) * 2012-05-15 2012-09-12 无锡艾柯威科技有限公司 一种提高电机绕组温度检测精度的方法
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3260874A1 (fr) * 2016-06-21 2017-12-27 General Electric Company Systèmes et procédés pour déterminer la détérioration de rotor d'une machine dynamoélectrique
US10914701B2 (en) 2016-06-21 2021-02-09 General Electric Company Systems and methods for determining rotor deterioration in a dynamoelectric machine

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