本文選題：風力發(fā)電 + 雙饋異步風力發(fā)電機　； 參考：《華北電力大學》2014年碩士論文

【摘要】：變速恒頻風力發(fā)電技術自誕生后發(fā)展迅猛,迅速占據風力發(fā)電行業(yè)的主流地,解決了長期以來困擾風力發(fā)電領域的最大間題,即如何在多變的環(huán)境風速條件下得到穩(wěn)定的電能輸出。作為變速恒頻風力發(fā)電技術的核心設備雙饋式異步發(fā)電機,以其特定的電磁結構與運行控制策略,在風輪捕獲風能轉化為機械能,經由傳動系統(tǒng)帶動其轉軸變速運行的同時,向電網輸出穩(wěn)定的電功率。雙饋異步風力發(fā)電機的出現(xiàn),不僅大幅提高了風力發(fā)電的電能質量,同時也大大提高了風力發(fā)電機組與電網的運行的安全性。 相較于傳統(tǒng)火力發(fā)電行業(yè)的汽輪發(fā)電機,雙饋異步風力發(fā)電機在幾何尺寸上小得多,這是很直觀的印象。當更加深入的分析它們機械結構、電磁關系、控制策略等方面,會發(fā)現(xiàn)不僅僅局限于幾何尺寸,雙饋異步風力發(fā)電機與汽輪發(fā)電機在各方面都有所不同。通過一些的風力發(fā)電廠的運行記錄,我們能發(fā)現(xiàn)一些發(fā)電機常見的故障,但也有一些故障是雙饋異步風力發(fā)電機獨有的。目前已經成熟的汽輪發(fā)電機狀態(tài)監(jiān)測與故障診斷技術,雖然對雙饋異步風力發(fā)電機的狀態(tài)監(jiān)測與故障診斷有很多可以借鑒與參考的地方,但并不完全適用。本文在總結前人對于發(fā)電機這一設備的狀態(tài)監(jiān)測與故障診斷的研究基礎之上,結合雙饋異步風力發(fā)電機的特點與實際運行工況,研究了適用于雙饋異步風力發(fā)電機的狀態(tài)監(jiān)測與故障診斷技術。 本文主要研究內容為： (1)詳細闡述了變速恒頻風力發(fā)電技術的工作原理及工作特性。從組織結構、電磁關系、等效電路等多個方面對雙饋異步風力發(fā)電機進行了細致剖析。理清雙饋異步風力發(fā)電機監(jiān)測參數(shù)之間的耦合關系。 (2)對現(xiàn)有的發(fā)電機故障分類體系進行分析,結合雙饋異步風力發(fā)電機的特點及電廠運行的歷史記錄,對雙饋異步風力發(fā)電機的故障進行整理。針對典型性故障從故障產生原因、發(fā)展、影響以及產生的后果這一過程進行機理分析,完整的列出所分析的故障影響的運行參數(shù)變化情況。 (3)簡要分析了階比重采樣技術在風電機組變工況運行特點的適用性。針對分析得出的在線監(jiān)測參數(shù),對有必要進行重采樣的信號進行變換,排除變工況對信號產生的影響。對經過處理的所有信號進行對應的處理,對各類故障各參數(shù)變化征兆進行融合,形成一個整體的故障識別體系。
[Abstract]:Since the birth of the variable speed constant frequency wind power technology, it has developed rapidly and occupied the mainstream of the wind power industry, and solved the biggest problem that has plagued the field of wind power generation for a long time. That is, how to get stable power output under the condition of changeable environmental wind speed. As the core equipment of variable speed constant frequency wind power generation technology, doubly-fed asynchronous generator, with its special electromagnetic structure and operation control strategy, is used to capture wind energy and convert wind energy into mechanical energy, and drive its rotating shaft to change speed through transmission system. Output steady electrical power to the power grid. The emergence of doubly-fed asynchronous wind generators not only greatly improves the power quality of wind power generation, but also greatly improves the security of wind turbine and power grid operation. Compared with traditional steam turbine generators, doubly-fed asynchronous wind turbines are much smaller in geometry, which is an intuitive impression. When we analyze their mechanical structure, electromagnetic relationship, control strategy and so on, we can find that they are not limited to geometry, but are different between doubly-fed asynchronous wind generator and turbogenerator. Through some records of wind power plants, we can find some common faults of generators, but there are also some faults that are unique to doubly-fed asynchronous wind turbines. At present, the status monitoring and fault diagnosis technology of turbogenerator is mature. Although there are many references for the condition monitoring and fault diagnosis of doubly-fed asynchronous wind turbine, it is not completely applicable. On the basis of summarizing the previous researches on the condition monitoring and fault diagnosis of the generator, this paper combines the characteristics of the doubly-fed asynchronous wind turbine and the actual operating conditions. The condition monitoring and fault diagnosis technology for doubly-fed asynchronous wind turbine is studied. The main contents of this paper are as follows: The principle and characteristics of variable speed constant frequency wind power generation technology are described in detail. The structure, electromagnetic relation and equivalent circuit of doubly-fed asynchronous wind turbine are analyzed in detail. The coupling relationship between the monitoring parameters of doubly-fed asynchronous wind turbine is clarified. 2) analyzing the existing fault classification system of generator, combining the characteristics of doubly-fed asynchronous wind turbine and the historical record of power plant operation, sorting out the faults of doubly-fed asynchronous wind generator. This paper analyzes the mechanism of the typical fault from the cause, development, influence and consequence of the fault, and lists the variation of the operation parameters of the fault. The applicability of step specific gravity sampling technology in wind turbine operation under variable operating conditions is briefly analyzed. According to the on-line monitoring parameters obtained from the analysis, the signal which is necessary to resampling is transformed to eliminate the influence of the variable working conditions on the signal production. All the processed signals are processed and all kinds of fault parameters are fused to form a whole fault identification system.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM315

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