本文選題：雙饋異步風(fēng)力發(fā)電機(jī) + 轉(zhuǎn)子匝間短路��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：雙饋異步風(fēng)力發(fā)電機(jī)是應(yīng)用最早的變速恒頻風(fēng)發(fā)電機(jī)型,也是現(xiàn)代風(fēng)力發(fā)電場(chǎng)的主流機(jī)型之一。轉(zhuǎn)子繞組匝間短路故障是一種多發(fā)于雙饋異步風(fēng)力發(fā)電機(jī)的故障,一旦故障發(fā)生會(huì)引起繞組局部的溫度升高,機(jī)械振動(dòng)加劇,進(jìn)而影響絕緣,使故障進(jìn)一步惡化。因此,對(duì)雙饋異步風(fēng)力發(fā)電機(jī)轉(zhuǎn)子繞組匝間短路故障診斷方法的研究,對(duì)保障風(fēng)電機(jī)組的可靠運(yùn)行以及提高整個(gè)風(fēng)電系統(tǒng)的運(yùn)行效率都具有指導(dǎo)意義。雙饋異步風(fēng)力發(fā)電機(jī)在實(shí)際運(yùn)行過程中,轉(zhuǎn)差率隨風(fēng)速的變化而時(shí)變。當(dāng)轉(zhuǎn)差率較小時(shí),傳統(tǒng)的定子電流頻譜中的(1+2ks)f的轉(zhuǎn)子匝間短路故障特征分量往往難以突出,易被基波分量淹沒。針對(duì)這一問題,本文提出了四種故障診斷方法:基于Clarke矢量模變換頻譜特性分析的轉(zhuǎn)子匝間短路故障診斷方法;基于Hilbert模變換頻譜特性分析的轉(zhuǎn)子匝間短路故障診斷方法;基于定子平均瞬時(shí)功率頻譜特性分析的轉(zhuǎn)子匝間短路故障診斷方法以及基于Hilbert變換下瞬時(shí)功率頻譜特性分析的轉(zhuǎn)子匝間短路故障診斷方法。上述四種方法,均經(jīng)過嚴(yán)格的數(shù)學(xué)推導(dǎo),且仿真結(jié)果與理論分析一致,表明上述方法在雙饋異步風(fēng)力發(fā)電機(jī)轉(zhuǎn)子匝間短路故障中具有應(yīng)用前景。同時(shí),本文根據(jù)多回路理論編寫相應(yīng)的M函數(shù)建立起了理想雙饋異步發(fā)電機(jī)在三相坐標(biāo)系下正常情況以及發(fā)生轉(zhuǎn)子繞組匝間短路故障情況的數(shù)學(xué)模型。通過對(duì)模型仿真得到定轉(zhuǎn)子電壓電流波形,并采用所提出的四種方法對(duì)上述電氣量進(jìn)行變換并進(jìn)行頻譜分析。仿真結(jié)果結(jié)合理論分析表明,在低轉(zhuǎn)差的情況下,與傳統(tǒng)的定子電流頻譜診斷方法相比,本文所提出的四種方法均能夠避免因故障特征分量過于接近基波分量而被淹沒的問題,有效提高檢測(cè)的準(zhǔn)確性,從而實(shí)現(xiàn)對(duì)雙饋異步風(fēng)力發(fā)電機(jī)轉(zhuǎn)子繞組匝間短路故障的早期診斷。
[Abstract]:Doubly-fed asynchronous wind turbine is the earliest variable speed constant frequency wind generator and one of the mainstream models of modern wind farm. The inter-turn short circuit fault of rotor windings is a kind of fault that often occurs in doubly-fed asynchronous wind turbine. Once the fault occurs, it will cause the local temperature of windings to rise, the mechanical vibration will be intensified, and then affect the insulation, and make the fault worsen further. Therefore, the research on the diagnosis method of inter-turn short-circuit fault in the rotor winding of doubly-fed asynchronous wind generator is of guiding significance to ensure the reliable operation of wind turbine and to improve the operation efficiency of the whole wind power system. In the actual operation of doubly-fed asynchronous wind turbine, the slip rate is time-varying with the change of wind speed. When the slip rate is small, the characteristic component of rotor inter-turn short circuit in the traditional stator current spectrum is often difficult to protrude and is easily submerged by the fundamental wave component. In order to solve this problem, four kinds of fault diagnosis methods are proposed in this paper: the method of rotor inter-turn short circuit fault diagnosis based on Clarke vector mode transform spectrum characteristic analysis, the method of rotor inter-turn short circuit fault diagnosis method based on Hilbert mode transform spectrum characteristic analysis, and the method of rotor inter-turn short circuit fault diagnosis based on spectrum analysis of Clarke vector mode transform. The fault diagnosis method of rotor inter-turn short circuit based on the analysis of stator average instantaneous power spectrum characteristic and the method of rotor inter-turn short circuit fault diagnosis based on the analysis of instantaneous power spectrum characteristic under Hilbert transform are presented. The four methods mentioned above have been strictly deduced by mathematics and the simulation results are consistent with the theoretical analysis. The results show that these methods have the application prospect in the rotor inter-turn short circuit fault of doubly-fed asynchronous wind turbine. At the same time, according to the multi-loop theory, the corresponding M function is compiled to establish the mathematical model of the normal condition and the inter-turn short circuit fault of the ideal doubly-fed asynchronous generator in three-phase coordinate system. The voltage and current waveforms of stator and rotor are obtained by simulation of the model, and the proposed four methods are used to transform the electrical quantities and analyze the frequency spectrum. The simulation results combined with theoretical analysis show that the four methods proposed in this paper can avoid the problem that the fault characteristic component is too close to the fundamental component in comparison with the traditional stator current spectrum diagnosis method under the condition of low slip error. The accuracy of detection is improved effectively, and the early diagnosis of inter-turn short circuit fault in rotor winding of doubly-fed asynchronous wind generator is realized.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM315

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本文編號(hào)：1797287