本文關鍵詞：雙饋風力發(fā)電機運行特性及其熱性能分析研究　出處：《南京理工大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 雙饋風力發(fā)電機 運行特性 熱網絡模型 故障特性 壽命預測

【摘要】：隨著常規(guī)能源日趨匱乏和環(huán)境問題的日趨嚴重,以風力發(fā)電為代表的新能源發(fā)電技術在全世界范圍內正以前所未有的速度發(fā)展。風力發(fā)電系統(tǒng)根據發(fā)電機運行特點可以分為恒速恒頻和變速恒頻兩種,其中變速恒頻雙饋風電機組具有可變速運行、靈活的轉子交流勵磁、變流器容量小和良好的功率調節(jié)能力等特性,是目前最廣泛采用的風電機組類型之一。本文以雙饋風電機組為主要研究對象,對其進行了運行原理分析、控制策略研究,并對作為其主要組成部件之一的雙饋電機進行了深入的熱性能分析、故障特性及壽命預測研究等,主要研究工作如下：首先介紹了雙饋風電機組的運行原理,詳細推導和建立了雙饋風電機組各組成部件的數(shù)學模型,建立了基于定子磁鏈定向的雙饋風力發(fā)電機矢量控制系統(tǒng),實現(xiàn)了最大功率跟蹤及有功、無功功率的解耦和獨立控制。在Matlab/Simulink平臺上搭建了系統(tǒng)仿真模型,研究了其在不同風速條件下的運行特性。仿真結果表明所搭建的模型具有良好的動態(tài)響應特性,能正確反映雙饋風電機組內部各變量的關系。其次分析了雙饋電機內部的損耗原理及溫升機制,結合傳熱學理論,基于相似理論與電路理論搭建了集總參數(shù)法的雙饋電機熱網絡模型,將其嵌套至雙饋風電機組動態(tài)仿真模型中,研究電機組件的發(fā)熱和冷卻機制,并在風速變化條件下對電機定子繞組進行暫態(tài)和穩(wěn)態(tài)的熱性能分析研究。然后分別研究了電機冷卻系統(tǒng)故障和電壓不平衡故障的故障機理�；谒⒌哪Ｐ�,得到了這兩種故障條件下電機的故障特性及電機的溫升特性,并與實際風電場采集的SCADA數(shù)據進行比對分析,結果驗證了所建立熱網絡模型及機理分析的合理與正確性。最后,研究了電機的壽命預測理論,分析了在正常運行工況及兩種故障條件下電機的壽命變化情況。本文的研究為掌握雙饋風力發(fā)電機的運行特性及其熱性能、優(yōu)化設計電機結構、新的故障診斷算法開發(fā)等方面提供了一定的理論依據和借鑒。
[Abstract]:With the increasing lack of conventional energy and environmental problems are becoming more and more serious. The new energy generation technology, represented by wind power generation, is developing at an unprecedented speed all over the world. According to the characteristics of generator operation, wind power generation system can be divided into constant speed constant frequency and variable speed constant frequency. The variable speed constant frequency doubly-fed wind turbine has the characteristics of variable speed operation, flexible rotor AC excitation, small converter capacity and good power regulation ability. It is one of the most widely used wind turbine types at present. In this paper, doubly-fed wind turbine is the main research object, the operation principle analysis and control strategy research are carried out. And as one of its main components of the doubly-fed machine for in-depth thermal performance analysis, fault characteristics and life prediction research, the main research work is as follows: first, introduced the operation principle of doubly-fed wind turbine. The mathematical model of the components of doubly-fed wind turbine is deduced and established in detail, and the vector control system of doubly-fed wind turbine based on stator flux orientation is established, which realizes the maximum power tracking and active power. Decoupling and independent control of reactive power. The system simulation model is built on Matlab/Simulink platform. The simulation results show that the model has good dynamic response characteristics. Can correctly reflect the relationship between the internal variables of the doubly-fed wind turbine. Secondly, the loss principle and temperature rise mechanism of the doubly-fed wind turbine are analyzed, combined with the theory of heat transfer. Based on the similarity theory and circuit theory, the thermal network model of doubly-fed wind turbine is built by lumped parameter method, which is nested into the dynamic simulation model of doubly-fed wind turbine, and the heating and cooling mechanism of motor components is studied. The transient and steady-state thermal performance of motor stator winding is analyzed under the condition of wind speed variation. Then the fault mechanism of motor cooling system fault and voltage imbalance fault are studied respectively based on the established model. The fault characteristics of the motor and the temperature rise characteristics of the motor under these two kinds of fault conditions are obtained and compared with the SCADA data collected by the actual wind farm. The results verify the rationality and correctness of the thermal network model and the mechanism analysis. Finally, the life prediction theory of the motor is studied. The variation of motor life under normal operating conditions and two kinds of faults is analyzed. In order to master the operation characteristics and thermal performance of the doubly-fed wind turbine, the structure of the motor is optimized. The development of new fault diagnosis algorithm provides some theoretical basis and reference.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM315

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本文編號：1435925