本文選題：汽輪發(fā)電機 + 氣隙靜偏心��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：氣隙靜偏心和轉(zhuǎn)子繞組匝間短路是發(fā)電機內(nèi)部常見的單因素故障,而事實上兩種故障經(jīng)常會同時出現(xiàn)耦合成多因素復(fù)合故障。本文主要對發(fā)電機內(nèi)部故障下軸系電磁轉(zhuǎn)矩進行理論分析和實驗研究。首先通過理論推導(dǎo)得到不同運行狀態(tài)下的電磁轉(zhuǎn)矩表達式。然后利用有限元軟件Ansoft建立了模擬發(fā)電機仿真模型并計算了對應(yīng)的電磁轉(zhuǎn)矩。最后對模擬發(fā)電機進行了實測,三者所得結(jié)果基本吻合。結(jié)果表明:正常運行下,電磁轉(zhuǎn)矩不存在諧波成分,均值隨著短路程度的加劇而減小。氣隙靜偏心使電磁轉(zhuǎn)矩產(chǎn)生二倍頻成分,偏心程度加劇時,均值與二倍頻幅值增大。轉(zhuǎn)子短路單故障下,發(fā)電機的電磁轉(zhuǎn)矩產(chǎn)生一倍頻成分,隨著短路程度的加劇,電磁轉(zhuǎn)矩均值減小,一倍頻幅值增大。復(fù)合故障下,電磁轉(zhuǎn)矩產(chǎn)生一倍頻和二倍頻成分。當僅短路程度加劇時,一倍頻幅值增大,均值和二倍頻幅值減小;當僅偏心程度加劇時,均值、一倍頻和二倍頻幅值增大。此外,本文對發(fā)電機內(nèi)部故障下轉(zhuǎn)子磁拉力進行了有限元計算與振動測試研究。結(jié)果表明:氣隙靜偏心單故障下轉(zhuǎn)子磁拉力的主要諧波成分為直流分量與二次諧波分量,轉(zhuǎn)子繞組匝間短路單故障下為一次諧波分量,復(fù)合故障下為直流分量、一次諧波分量、二次諧波分量以及三次諧波分量。其中,除直流分量外,各次諧波分量均會激勵轉(zhuǎn)子產(chǎn)生振動。論文成果為汽輪發(fā)電機實際機組存在的氣隙靜偏心單因素故障、轉(zhuǎn)子匝間短路單因素故障及其耦合而成的多因素復(fù)合故障的監(jiān)測和診斷提供了一定的參考和依據(jù),具有積極意義。
[Abstract]:Static eccentricity of air gap and inter-turn short circuit of rotor winding are common single factor faults in generator. In this paper, the electromagnetic torque of shafting under the internal fault of generator is studied theoretically and experimentally. First, the expressions of electromagnetic torque in different operating states are derived theoretically. Then the simulation model of simulated generator is established by using finite element software Ansoft and the corresponding electromagnetic torque is calculated. Finally, the simulated generator is measured and the results are in good agreement with each other. The results show that there is no harmonic component in the electromagnetic torque under normal operation, and the mean value decreases with the increase of the short circuit degree. The static eccentricity of air gap makes the electromagnetic torque produce double frequency component. When the eccentricity intensifies, the mean value and the amplitude of double frequency increase. Under the single fault of rotor short circuit, the electromagnetic torque of generator produces one frequency doubling component. With the increase of short circuit degree, the mean value of electromagnetic torque decreases and the amplitude of double frequency increases. Under the complex fault, the electromagnetic torque produces double frequency and double frequency components. When the degree of short circuit is only increasing, the amplitude of double frequency increases, the mean and the amplitude of double frequency decrease, and when the degree of eccentricity is increased, the amplitudes of average, double frequency and double frequency increase. In addition, the finite element calculation and vibration test of rotor magnetic pull force under internal fault of generator are carried out in this paper. The results show that the main harmonic components of rotor magnetic tension are DC component and second harmonic component under air gap static eccentricity single fault, first harmonic component in rotor winding inter-turn short circuit single fault, DC component and first harmonic component in complex fault. Second harmonic component and third harmonic component. In addition to DC components, each harmonic component excites the rotor to produce vibration. The results of the paper provide a certain reference and basis for the monitoring and diagnosis of the air gap static eccentricity single factor fault, rotor interturn short circuit single factor fault and the multi-factor composite fault formed by coupling. It is of positive significance.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM31

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本文編號：2039629