【摘要】：利用抽水蓄能電站對電力系統(tǒng)進(jìn)行調(diào)峰填谷,是提高電力系統(tǒng)經(jīng)濟(jì)性、可靠性的有效手段。抽水蓄能電機(jī)是抽水蓄能電站的重要部分,而阻尼繞組作為該種電機(jī)的重要組成部件,不僅可以抑制磁場突變和轉(zhuǎn)子振蕩,同時在抽水蓄能電機(jī)電動工況下異步起動時提供起動力矩,其形狀和分布會影響電機(jī)的電磁性能和轉(zhuǎn)子各部件溫升,為此,研究阻尼繞組對電機(jī)電磁參數(shù)和溫度分布的影響具有重要意義。 本文綜合抽水蓄能電機(jī)實際結(jié)構(gòu)尺寸、額定工作參數(shù)和電磁場理論,建立二維有限元電機(jī)數(shù)學(xué)模型,對電機(jī)內(nèi)電磁場進(jìn)行求解,計算得到電機(jī)的電抗參數(shù)和阻尼繞組渦流損耗,利用解析公式計算轉(zhuǎn)子內(nèi)附加損耗,找出磁極表面和阻尼繞組的損耗分布規(guī)律。然后將有阻尼繞組電機(jī)與無阻尼繞組電機(jī)進(jìn)行比較,討論電機(jī)加入阻尼繞組后對轉(zhuǎn)子內(nèi)損耗分布和電抗參數(shù)的影響,并研究阻尼繞組在不對稱運(yùn)行工況下的渦流損耗變化,詳細(xì)討論分析阻尼條節(jié)距和直徑變化的相關(guān)影響,得到的結(jié)論可作為抽水蓄能電機(jī)阻尼繞組設(shè)計參考依據(jù)。最后,建立電機(jī)轉(zhuǎn)子三維流體場和溫度場的耦合計算模型,計算分析發(fā)電和電動兩種工況額定負(fù)載下電機(jī)轉(zhuǎn)子范圍內(nèi)的流體和各結(jié)構(gòu)件溫度分布規(guī)律,并與實測值比較,驗證計算有效性。在此基礎(chǔ)上,研究了阻尼繞組斷條故障對電抗參數(shù)、轉(zhuǎn)子內(nèi)損耗分布和溫度分布的影響。
[Abstract]:It is an effective means to improve the economy and reliability of the power system by using pumped storage power station to adjust the peak and fill the valley of the power system. Pumped storage motor is an important part of pumped storage power station, and damping winding, as an important component of this kind of motor, can not only restrain the sudden change of magnetic field and rotor oscillation. At the same time, when the motor starts asynchronously under the electric condition of pumped storage motor, the shape and distribution of the torque will affect the electromagnetic performance of the motor and the temperature rise of the components of the rotor. It is of great significance to study the influence of damping windings on the electromagnetic parameters and temperature distribution of the motor. In this paper, according to the actual structure size, rated working parameters and electromagnetic field theory of pumped storage motor, the mathematical model of two-dimensional finite element motor is established. The electromagnetic field in motor is solved, and the reactance parameters and eddy current loss of damped winding are calculated. An analytical formula is used to calculate the additional loss in the rotor, and the loss distribution law of the magnetic pole surface and damping winding is found out. Then, the damping winding motor is compared with the undamped winding motor, and the influence of the damping winding on the loss distribution and reactance parameters of the rotor is discussed, and the eddy current loss change of the damped winding under the asymmetrical operation condition is studied. The influence of damping bar pitch and diameter variation is discussed in detail. The conclusion can be used as a reference for damping winding design of pumped storage motor. Finally, the coupling calculation model of three-dimensional fluid field and temperature field of motor rotor is established, and the temperature distribution law of fluid and structure in the range of motor rotor under the rated load of power generation and electric power is calculated and analyzed, and compared with the measured value. Verify the validity of the calculation. On the basis of this, the influence of damped winding broken bar fault on reactance parameters, loss distribution and temperature distribution in rotor is studied.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV743;TV734

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