本文選題：雙饋風(fēng)電機(jī)組 + 變流器IGBT模塊　； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：由于風(fēng)能的間歇式固有特征，風(fēng)電機(jī)組長時間、頻繁和大范圍的隨機(jī)出力變化，往往導(dǎo)致風(fēng)電變流器IGBT模塊（由絕緣柵雙極型晶體管（IGBT）及晶體二極管（Diode）組成）持續(xù)承受劇烈的電熱應(yīng)力沖擊，尤其是風(fēng)電機(jī)組機(jī)側(cè)變流器長期處于低頻下運行，其IGBT模塊因結(jié)溫波動變化而導(dǎo)致其運行可靠性較低的問題凸顯。為了準(zhǔn)確獲取風(fēng)電變流器IGBT模塊的結(jié)溫并評估其運行可靠性，論文以雙饋風(fēng)電機(jī)組的變流器IGBT模塊為對象，，研究其損耗及結(jié)溫計算模型，并提出機(jī)側(cè)變流器IGBT模塊的功率循環(huán)能力評估方法。其選題符合我國大力發(fā)展風(fēng)力發(fā)電的戰(zhàn)略需求，研究成果對提高大功率風(fēng)電變流器可靠性的狀態(tài)監(jiān)測水平有著重要的學(xué)術(shù)意義和應(yīng)用價值。 本文主要內(nèi)容包括： ①在對IGBT模塊封裝結(jié)構(gòu)及熱傳遞過程深入了解的基礎(chǔ)上，重點掌握器件的電熱耦合特性及常見的失效機(jī)理，為進(jìn)一步開展結(jié)溫計算及功率循環(huán)能力的研究奠定基礎(chǔ)。 ②為了準(zhǔn)確計算變流器IGBT模塊的結(jié)溫，研究并建立了基于開關(guān)周期損耗分析方法的IGBT模塊結(jié)溫計算模型，針對實際IGBT模塊，將本文結(jié)溫模型的計算結(jié)果，與采用基于輸出周期損耗分析的常規(guī)結(jié)溫計算模型的結(jié)果進(jìn)行比較，并和PLECS電力電子熱仿真結(jié)果進(jìn)行驗證。 ③為準(zhǔn)確分析雙饋風(fēng)電變流器IGBT模塊損耗及結(jié)溫的變化規(guī)律，考慮雙饋風(fēng)電機(jī)組運行特性和變流器控制策略，建立了雙饋風(fēng)電變流器IGBT模塊損耗及結(jié)溫計算模型，并分別對風(fēng)電機(jī)組全運行工況下機(jī)側(cè)和網(wǎng)側(cè)IGBT模塊的損耗及結(jié)溫進(jìn)行了研究。 ④為準(zhǔn)確評估實際湍流風(fēng)速對雙饋風(fēng)電機(jī)組機(jī)側(cè)變流器IGBT模塊功率循環(huán)能力的影響，基于雨流算法提取隨機(jī)結(jié)溫波動信息，建立了雙饋風(fēng)電機(jī)組機(jī)側(cè)變流器IGBT模塊平均故障間隔時間（Mean Time Between Failure，MTBF）的評估模型，并分析了不同湍流風(fēng)速對其結(jié)溫波動特性和功率循環(huán)能力的影響。 上述研究內(nèi)容為風(fēng)電變流器IGBT模塊結(jié)溫的在線準(zhǔn)確評估及湍流風(fēng)速下模塊可靠性的定量分析奠定了理論基礎(chǔ)和技術(shù)支撐。
[Abstract]:Due to the intermittent inherent characteristics of wind energy, the long time, frequent and large range of random output changes of the wind power generator often lead to the persistent intense electric stress impact of the wind power converter IGBT module (the insulated gate bipolar transistor (IGBT) and the crystal diode (Diode)), especially the wind turbine side converter is in the low frequency for a long time. In order to obtain the temperature of the IGBT module of the wind power converter and evaluate the reliability of its operation reliability, the IGBT module of the dual feed wind power converter is used as the object, the calculation model of its loss and the junction temperature is studied, and the machine side converter IGBT is put forward. The evaluation method of power cycle capacity of the module is in line with the strategic demand of our country to vigorously develop the wind power generation. The research results have important academic significance and application value to improve the state monitoring level of the reliability of the high power wind power converter.
The main contents of this paper are as follows:
On the basis of thorough understanding of the package structure and heat transfer process of IGBT module, the electrothermal coupling characteristics and common failure mechanism of the device are emphasized, which lays the foundation for further research on the calculation of the junction temperature and the power cycle ability.
In order to calculate the junction temperature of the converter IGBT module accurately, the IGBT module junction temperature calculation model based on the switching periodic loss analysis method is studied and established. According to the actual IGBT module, the calculation results of the junction temperature model are compared with the results of the conventional junction temperature calculation model based on the output cycle loss analysis, and PLECS electricity. The results of the force electron thermal simulation are verified.
(3) in order to accurately analyze the variation of IGBT module loss and junction temperature of doubly fed wind power converter, considering the operating characteristics and converter control strategy of doubly fed wind turbine, the IGBT module loss and junction temperature calculation model of doubly fed wind power converter are established, and the loss and junction temperature of the IGBT module on the side and the net side of the wind turbine are respectively analyzed. The study was done.
In order to accurately evaluate the effect of the actual turbulence wind speed on the power cycle capacity of the IGBT module of the double fed wind turbine side converter, based on the rain flow algorithm to extract the random node temperature fluctuation information, an evaluation model of the average fault interval time (Mean Time Between Failure, MTBF) of the double fed wind turbine side converter is established and analyzed. The effect of turbulence velocity on the junction temperature fluctuation and power cycling capability is discussed.
The above research content lays a theoretical foundation and technical support for the on-line accurate evaluation of the junction temperature of the IGBT module of the wind power converter and the quantitative analysis of the reliability of the module under the turbulence wind speed.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46;TN322.8

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