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  本文關鍵詞：基于小波調(diào)制的雙級矩陣變換器的研究　出處：《哈爾濱工業(yè)大學》2016年碩士論文　論文類型：學位論文

  更多相關文章： 小波調(diào)制 多分辨分析 雙級矩陣變換器 協(xié)同調(diào)制 共模電壓

【摘要】：雙級矩陣變換器作為一種新的交流-交流型電力變換器,相比于傳統(tǒng)單級矩陣變換器而言有著自己獨特的優(yōu)勢。它不僅具有傳統(tǒng)矩陣變換器能量雙向可逆、輸入輸出電流正弦、輸入功率因數(shù)可調(diào)等優(yōu)點,同時也克服了傳統(tǒng)矩陣變換器開關數(shù)量多、換流過程復雜等缺點,使得拓撲結(jié)構(gòu)更簡單,換流過程更可靠。在實際應用中常會遇到各種非理想條件,這將影響雙級矩陣變換器的輸出電壓質(zhì)量。因此,通過良好的調(diào)制策略來提高輸出電壓質(zhì)量一直是很多學者的研究重點。良好的控制策略既能夠有效的改善輸入輸出特性,還可以降低諧波污染和減小開關損耗,因而常受到廣大學者的關注和研究。相比于傳統(tǒng)調(diào)制策略,本文提出一種新型的小波調(diào)制策略,并對其在雙級矩陣變換器的應用中展開研究。小波理論因其獨特的局部時頻域分析能力和多分辨分析原理,被廣泛應用于通信、地震勘測領域。目前,國外已有學者對其展開研究,將其應用于變換器的調(diào)制技術(shù)中,在整流器和逆變器中均已實現(xiàn)應用,體現(xiàn)了良好的輸出性能。本文的研究主體是雙級矩陣變換器,分別從整流級和逆變級兩方面進行了研究。對小波調(diào)制策略在整流級中的輸入電流,直流側(cè)電壓進行了分析,并與經(jīng)典的空間矢量調(diào)制策略的性能進行了對比;對逆變級中的三相輸出電壓及其諧波畸變率做出了分析,且同樣與空間矢量調(diào)制完成了對比。其次,對小波調(diào)制策略的整流級和逆變級進行了協(xié)同調(diào)制,完成了小波調(diào)制在雙級矩陣變換器中的應用,分析了協(xié)同調(diào)制的輸入輸出性能,并在多種配合方式下進行了性能對比的分析。同時又對小波調(diào)制策略下的共模電壓瞬時值進行了分析,通過改進算法,完成了對共模電壓的抑制,并對共模電壓波形抑制前后進行了對比。最后,結(jié)合各部分內(nèi)容的仿真分析,通過實驗來驗證小波調(diào)理論。以DSP2812為控制核心,搭建了軟硬件實驗平臺,分別對上述仿真內(nèi)容展開實驗,并通過實驗波形與仿真波形對比,說明了小波調(diào)制仿真分析的正確性,驗證了小波調(diào)制的可行性。研究結(jié)果表明,小波調(diào)制可實現(xiàn)對雙級矩陣變換器的有效控制。且小波調(diào)制策略下無論整流級和逆變級,輸入電流、輸出電壓質(zhì)量高、諧波含量小,算法實現(xiàn)簡單。小波調(diào)制的雙級矩陣變換器共模電壓抑制方法簡單方便,能有明顯的抑制效果。
[Abstract]:As a new AC / AC power converter, the two-stage matrix converter has its own unique advantages compared with the traditional single-stage matrix converter, which not only has the traditional matrix converter energy two-way reversible. The advantages of sinusoidal input and output current and adjustable input power factor also overcome the shortcomings of the traditional matrix converter such as the large number of switches and the complex commutation process which makes the topology simpler. The commutation process is more reliable. Various non-ideal conditions are often encountered in practical applications, which will affect the output voltage quality of the two-stage matrix converter. A good modulation strategy to improve the quality of output voltage has been the focus of many scholars. A good control strategy not only can effectively improve the input and output characteristics, but also can reduce harmonic pollution and switching loss. Compared with the traditional modulation strategy, this paper proposes a new wavelet modulation strategy. The wavelet theory is widely used in the field of communication and seismic survey because of its unique local time-frequency domain analysis ability and multi-resolution analysis principle. Some scholars abroad have studied it and applied it to the modulation technology of converter, which has been applied in rectifier and inverter. The main body of this thesis is two-stage matrix converter, which is studied from two aspects of rectifier stage and inverter stage, respectively. The input current of wavelet modulation strategy in rectifier stage is studied. The DC side voltage is analyzed and compared with the classical space vector modulation strategy. The three-phase output voltage and harmonic distortion rate in the inverter stage are analyzed and compared with the space vector modulation. Secondly, the rectifier and inverter stages of the wavelet modulation strategy are modulated synergistically. The application of wavelet modulation in two-stage matrix converter is completed, and the input and output performance of cooperative modulation is analyzed. At the same time, the instantaneous value of common-mode voltage under wavelet modulation strategy is analyzed, and the suppression of common-mode voltage is accomplished by improving the algorithm. And the common mode voltage waveform suppression before and after the comparison. Finally, combined with the simulation of each part of the analysis, through experiments to verify the wavelet modulation theory, with DSP2812 as the control core. The software and hardware experiment platform is built, and the simulation contents are tested respectively, and the correctness of the simulation analysis of wavelet modulation is proved by comparing the experimental waveform with the simulation waveform. The feasibility of wavelet modulation is verified. The results show that wavelet modulation can effectively control the two-stage matrix converter, and the input current can be obtained under the wavelet modulation strategy, regardless of the rectifier stage and the inverter stage. The output voltage quality is high, the harmonic content is small, and the algorithm is simple. The common mode voltage suppression method of wavelet modulated two-stage matrix converter is simple and convenient, and has obvious suppression effect.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM46
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本文編號：1418293