本文選題：電流型PWM整流器 + 疊流時間　； 參考：《南京航空航天大學》2016年碩士論文

【摘要】：隨著電力電子設(shè)備的大量使用,諧波和無功損耗對于電網(wǎng)的影響也越來越嚴重,PWM整流器作為功率因數(shù)校正方法,具有功率因數(shù)可控,諧波含量低等優(yōu)點。PWM整流器按照輸出源特性可以分為電壓型PWM整流器和電流型PWM整流器,電流型PWM整流器相比于電壓型PWM整流器起步比較晚,但隨著器件、調(diào)制技術(shù)的發(fā)展,電流型PWM整流器的應用范圍也越來越廣泛,如在電機驅(qū)動、超導儲能、數(shù)據(jù)中心等場合,因此電流型PWM整流器的研究應用成為國內(nèi)外研究熱點。本文首先對電流型PWM整流器進行了原理分析并建立了該拓撲結(jié)構(gòu)的數(shù)學模型,對電流型PWM整流器的信號發(fā)生技術(shù)進行了探索分析,給出了驅(qū)動信號的具體生成方法。此外討論了本論文樣機所使用的控制方法,為后面的分析研究提供了良好的基礎(chǔ)。接著本文重點研究了電流型PWM整流器驅(qū)動信號里的疊流時間。首先分析了疊流時間對于開關(guān)管之間電流換流的影響,得出疊流時間會造成開關(guān)管部分零電壓導通和零電流關(guān)斷;接著分析了疊流時間對于開關(guān)損耗的影響,提出了疊流時間的選取下限;根據(jù)疊流時間對開關(guān)管間電流換流的影響,分析一個調(diào)制周期內(nèi)每種換流情況,得到加入疊流時間前后的交流側(cè)電流波形,通過對比得到一個調(diào)制周期的交流側(cè)疊流情況,對其進行傅里葉分析,得到疊流諧波與疊流時間的關(guān)系式,經(jīng)過仿真和實驗驗證了理論分析的正確性,說明了疊流時間的存在會引起網(wǎng)側(cè)電流諧波含量增加。此外,本文還提出一種疊流諧波的抑制方法,該方法根據(jù)三相橋臂中點電壓大小關(guān)系分區(qū)使用正負斜率鋸齒載波進行調(diào)制,能有效抑制疊流時間帶來的諧波,通過仿真和實驗驗證了該方法的有效性。本文設(shè)計了3kW基于SiC MOSFET的三相電流型PWM整流器,給出了該樣機的具體設(shè)計方法,對樣機進行了實驗測試,實驗波形驗證了樣機設(shè)計的正確性。最后對電流型PWM整流器的開關(guān)管進行了損耗分析,給出了SiC MOSFET與Si IGBT的理論損耗對比,并分別對基于兩種器件的電流型PWM整流器樣機進行了效率測試和網(wǎng)側(cè)電流諧波含量測試,給出了效率對比曲線與網(wǎng)側(cè)電流諧波含量對比曲線,說明了SiCMOSFET相比于Si IGBT在電流型PWM整流器的應用優(yōu)勢。
[Abstract]:With the extensive use of power electronic equipment, the influence of harmonic and reactive power loss on power network is becoming more and more serious. As a power factor correction method, PWM rectifier has controllable power factor. The advantages of low harmonic content .PWM rectifier can be divided into voltage-source PWM rectifier and current-source PWM rectifier according to the characteristics of output source. The current-source PWM rectifier starts later than the voltage-source PWM rectifier, but with the development of device and modulation technology, The application of current-source PWM rectifier is more and more extensive, such as motor drive, superconducting energy storage, data center and so on. Therefore, the research and application of current-source PWM rectifier has become a research hotspot at home and abroad. In this paper, the principle of the current-source PWM rectifier is analyzed and the mathematical model of the topology is established. The signal generation technology of the current-source PWM rectifier is analyzed, and the method of generating the driving signal is given. In addition, the control method used in the prototype is discussed, which provides a good basis for the later analysis. Then this paper focuses on the stack time in the drive signal of current-source PWM rectifier. Firstly, the effect of stack time on current commutation between switches is analyzed, and it is concluded that stack time will result in partial zero voltage conduction and zero current turn-off of switch tube, and then the effect of stack time on switching loss is analyzed. According to the influence of stack time on current commutation between switches, the current waveform of AC side before and after adding stack time is obtained by analyzing each commutation condition in a modulation period. By comparing and analyzing the overlapping current of an AC side with a modulation period, the formula of the relationship between the stack harmonic and the stack time is obtained. The correctness of the theoretical analysis is verified by simulation and experiment. It is shown that the existence of stacking time will increase the harmonic content of the current in the grid side. In addition, this paper also proposes a method for suppressing the stack current harmonics, which is modulated by positive and negative slope sawtooth carriers according to the voltage relationship between the midpoint of the three-phase bridge arm, which can effectively suppress the harmonics brought by the stack current time. The effectiveness of the method is verified by simulation and experiments. In this paper, a three-phase current-source PWM rectifier based on SiC MOSFET for 3kW is designed, and the concrete design method of the prototype is given. The experimental results show that the design of the prototype is correct. Finally, the loss analysis of the switch of current-source PWM rectifier is carried out, the theoretical loss comparison between SiC MOSFET and Si IGBT is given, and the efficiency and current harmonic content of current-source PWM rectifier based on two kinds of devices are tested respectively. The efficiency contrast curve and the current harmonic content contrast curve on the grid side are given. The advantages of SiCMOSFET in the application of current-source PWM rectifier compared with Si IGBT are explained.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM461

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本文編號：1941753