【摘要】：三電平電力變換裝置憑借其較低的元器件應(yīng)力,較高的功率密度等優(yōu)勢(shì)在大功率電流變換場(chǎng)合得到了廣泛應(yīng)用。三電平特有的結(jié)構(gòu)決定了其與傳統(tǒng)兩電平電流變換設(shè)備在控制、分析等方面的差異。本文以三電平維也納AC/DC為研究對(duì)象,以功率因數(shù)校正為基本目標(biāo),在對(duì)數(shù)學(xué)模型進(jìn)行構(gòu)建的基礎(chǔ)上,對(duì)結(jié)構(gòu)特點(diǎn)、校正原理以及性能表現(xiàn)等進(jìn)行了分析。對(duì)提高功率因數(shù)方法的分析從兩方面展開,一方面,對(duì)傳統(tǒng)的以相為控制單位的控制方式進(jìn)行了闡述,另一方面,以空間矢量控制方式進(jìn)行了分析,并提出了改進(jìn)的三電平空間矢量合成技術(shù),該技術(shù)利用幾何投影方式實(shí)現(xiàn)三電平矢量合成向兩電平矢量合成轉(zhuǎn)換,并通過對(duì)三相電流極性的實(shí)時(shí)采集確定參考矢量的坐標(biāo)位置。和傳統(tǒng)的空間矢量合成校正方式相比,一方面能充分利用現(xiàn)有的傳統(tǒng)兩電平合成方法,另一方面使得復(fù)雜的矢量合成更易理解和掌握。除了對(duì)單臺(tái)設(shè)備功率因數(shù)校正技術(shù)分析外,本文還從設(shè)備網(wǎng)側(cè)以及直流輸出側(cè)兩個(gè)角度對(duì)多臺(tái)設(shè)備并列運(yùn)行的情況進(jìn)行了數(shù)學(xué)建模與分析,通過構(gòu)建網(wǎng)側(cè)并聯(lián)設(shè)備的整體數(shù)學(xué)模型,使得關(guān)于設(shè)備間的環(huán)流路徑、設(shè)備間的相互影響等的分析過程更為簡(jiǎn)化。同時(shí),揭示了零序分量在設(shè)備并列運(yùn)行過程中的關(guān)鍵作用,闡述了三電平AC/DC設(shè)備直流側(cè)電壓均衡控制與零序電流抑制間的聯(lián)系;以戴維南等效原理構(gòu)建的直流輸出側(cè)整體數(shù)學(xué)模型,從直流側(cè)的角度揭示了設(shè)備間并列運(yùn)行時(shí),直流輸出電壓對(duì)環(huán)流產(chǎn)生的促進(jìn)作用。同時(shí),引入了虛擬電阻思想。借助虛擬電阻,根據(jù)直流側(cè)環(huán)流的變化情況,實(shí)時(shí)的對(duì)直流輸出電壓進(jìn)行調(diào)整。仿真結(jié)果表明,上述方法能夠有效實(shí)現(xiàn)功率因數(shù)校正與控制,且實(shí)現(xiàn)對(duì)環(huán)流的抑制。本文從三電平整流設(shè)備的結(jié)構(gòu)、數(shù)學(xué)模型出發(fā),針對(duì)功率因數(shù)校正及其控制、單機(jī)獨(dú)立運(yùn)行以及多設(shè)備并列運(yùn)行問題進(jìn)行了系統(tǒng)、詳細(xì)的理論分析與驗(yàn)證。
[Abstract]:Three-level power converter is widely used in high-power current conversion field due to its advantages of low component stress and high power density. The unique structure of three-level determines the difference between three-level current conversion equipment and traditional two-level current conversion equipment in control, analysis and so on. In this paper, the three-level Vienna AC/DC is taken as the research object and the power factor correction as the basic goal. Based on the construction of the mathematical model, the structural characteristics, correction principle and performance are analyzed. The method of improving power factor is analyzed from two aspects. On the one hand, the traditional control mode with phase as the control unit is expounded, on the other hand, the space vector control method is analyzed. An improved three-level space vector synthesis technique is proposed, which uses geometric projection to realize the conversion from three-level vector synthesis to two-level vector synthesis. The coordinate position of the reference vector is determined by the real-time acquisition of three-phase current polarity. Compared with the traditional space vector synthesis correction method, on the one hand, it can make full use of the traditional two-level synthesis method, on the other hand, it makes the complex vector synthesis easier to understand and master. In addition to the analysis of power factor correction technology for single equipment, the mathematical modeling and analysis of the parallel operation of multiple devices are carried out from the two angles of the equipment network side and the DC output side. By constructing the overall mathematical model of the parallel equipment on the network side, the analysis process of the circulation path between the devices and the interaction between the devices is more simplified. At the same time, the key role of zero sequence component in the parallel operation of the equipment is revealed, and the relationship between DC side voltage equalization control and zero sequence current suppression of three-level AC/DC equipment is discussed. The integral mathematical model of DC output side based on Davinan's equivalence principle is used to reveal the effect of DC output voltage on the circulation when the equipment is running side by side in parallel. At the same time, the idea of virtual resistance is introduced. With the help of virtual resistor, the DC output voltage is adjusted in real time according to the variation of DC side circulation. The simulation results show that the proposed method can effectively realize power factor correction and control and suppress the circulation. Starting from the structure and mathematical model of three-level rectifier equipment, this paper presents a detailed theoretical analysis and verification of power factor correction and its control, independent operation of single machine and parallel operation of multi-equipment.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM46

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本文編號(hào)：2346416