本文選題：風(fēng)力發(fā)電　切入點(diǎn)：PWM變流器　出處：《江南大學(xué)》2014年碩士論文

【摘要】：風(fēng)電產(chǎn)業(yè)的迅猛發(fā)展，對(duì)風(fēng)力發(fā)電系統(tǒng)中的各組成部件裝置的可靠性和穩(wěn)定性提出了更高的要求。雙脈沖寬度調(diào)制(Pulse Width Modulation, PWM)變流器作為風(fēng)電系統(tǒng)與電網(wǎng)的接口，既要控制電壓的穩(wěn)定，又要配合實(shí)現(xiàn)最大風(fēng)能利用率，同時(shí)也是最容易發(fā)生故障的部件之一。變流器一旦發(fā)生故障，如不及時(shí)處理，輕則會(huì)降低供電質(zhì)量，重則威脅到整個(gè)風(fēng)電系統(tǒng)的正常工作和電網(wǎng)安全。因此，如何在雙PWM變流器發(fā)生故障時(shí)，準(zhǔn)確、快速地判斷故障類(lèi)型，并及時(shí)進(jìn)行故障的定位與診斷是有效提高風(fēng)電系統(tǒng)的安全性和可靠性，降低風(fēng)電成本的重要手段。 論文首先介紹了風(fēng)電系統(tǒng)中雙PWM變流器的工作特點(diǎn)，對(duì)絕緣柵雙極型晶體管(Insulated Gate Bipolar Transistor, IGBT)開(kāi)路故障進(jìn)行了分類(lèi)，分析了整流工作狀態(tài)下PWM變流器的輸出電壓特性，討論了IGBT功率管發(fā)生開(kāi)路故障時(shí)對(duì)變流器輸出電壓的影響，借助仿真實(shí)驗(yàn)，驗(yàn)證了故障分類(lèi)的合理性。 其次，利用小波包變換更好的分析能力，對(duì)變流器的輸出電壓進(jìn)行處理，得到了不同類(lèi)型故障的故障特征信息，實(shí)現(xiàn)了對(duì)整流工作狀態(tài)下PWM變流器的初步故障識(shí)別，仿真結(jié)果表明該方法的有效性。 再次，針對(duì)PWM變流器的逆變工作狀態(tài)，探討了故障對(duì)逆變器工作特性的影響，采用小波包變換獲取不同故障類(lèi)型時(shí)的故障特征信息，再利用支持向量機(jī)的分類(lèi)能力對(duì)故障信息進(jìn)行分類(lèi)，實(shí)現(xiàn)了對(duì)PWM變流器IGBT功率管開(kāi)路故障診斷，仿真結(jié)果證明了該方法的準(zhǔn)確性。 最后，針對(duì)雙PWM變流器的結(jié)構(gòu)特點(diǎn)，為了使雙PWM變流器發(fā)生IGBT功率管開(kāi)路故障后能盡早地恢復(fù)正常運(yùn)行狀態(tài)，提出了一種變流器開(kāi)路故障容錯(cuò)拓?fù)浣Y(jié)構(gòu)，，通過(guò)仿真分析驗(yàn)證了該容錯(cuò)策略的合理性。
[Abstract]:With the rapid development of wind power industry, the reliability and stability of the components of wind power system are required.As the interface between wind power system and power grid, the dual pulse width modulation pulse Width modulation (PWM) converter not only controls the stability of voltage, but also realizes the maximum wind energy utilization ratio, and is also one of the most vulnerable components.Once the converter fails, if it is not dealt with in time, it will reduce the quality of power supply, and threaten the normal operation of the whole wind power system and the safety of the power grid.Therefore, how to judge the fault type accurately and quickly, and to locate and diagnose the fault in time is an important means to improve the safety and reliability of wind power system and reduce the cost of wind power.This paper first introduces the working characteristics of double PWM converter in wind power system, classifies the open circuit faults of insulated gate bipolar transistor insulated Gate Bipolar transistor (IGBT), and analyzes the output voltage characteristics of PWM converter under rectifying operation.The effect of open circuit fault of IGBT power transistor on output voltage of converter is discussed. The rationality of fault classification is verified by simulation experiment.Secondly, the output voltage of the converter is processed by using wavelet packet transform, and the fault characteristic information of different types of faults is obtained, and the initial fault identification of PWM converter under rectifying working condition is realized.Simulation results show the effectiveness of the method.Thirdly, aiming at the inverter working state of PWM converter, the influence of fault on inverter performance is discussed. Wavelet packet transform is used to obtain the fault characteristic information of different fault types.Then the classification ability of support vector machine is used to classify the fault information, and the open circuit fault diagnosis of IGBT power transistor in PWM converter is realized. The simulation results prove the accuracy of the method.Finally, according to the structural characteristics of the double PWM converter, in order to restore the normal operation state of the double PWM converter as soon as possible after the open circuit fault of the IGBT power transistor occurs, a fault tolerant topology for open circuit fault of the converter is proposed.The rationality of the fault-tolerant strategy is verified by simulation analysis.
【學(xué)位授予單位】：江南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM614

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