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  本文選題：Z源逆變器　切入點：寬輸入　出處：《南京航空航天大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：寬輸入高增益逆變器在新能源開發(fā)領(lǐng)域起著至關(guān)重要的作用,它將新能源輸出低壓直流轉(zhuǎn)換為高壓交流電輸出。目前,Z源逆變器做為寬輸入逆變器中的一個研究熱點,具有橋臂無死區(qū)、輸出波形THD小、可靠性高的優(yōu)點,得到了國內(nèi)外學(xué)者的廣泛關(guān)注。在保留Z源逆變器優(yōu)點的同時,進(jìn)一步提升其電壓增益,滿足新能源發(fā)電低輸入電壓的要求,具有重要的研究意義。本文首先對耦合電感類Z源逆變器進(jìn)行了拓?fù)渫蒲?介紹了該類逆變器的工作原理和調(diào)制策略,比較了該類逆變器不同拓?fù)涞碾妷涸鲆�、器件�?yīng)力以及耦合電感的體積,總結(jié)了耦合電感類Z源逆變器的特點。其次,在開關(guān)電感準(zhǔn)Z源逆變器基礎(chǔ)上,將開關(guān)電感單元的一個二極管替換為電容,提出一種基本升壓單元準(zhǔn)Z源逆變器,給出了該逆變器的工作原理及逆變器的各項特性分析,進(jìn)一步提升了電壓增益;在基本升壓單元準(zhǔn)Z源逆變器基礎(chǔ)上,將升壓單元兩電感耦合,提出一種耦合電感升壓單元準(zhǔn)Z源逆變器,減少了一個無源器件的使用,并利用耦合電感漏感來抑制二極管電流峰值,分析了耦合電感匝比、漏感、直通占空比以及輸入平均電流對增益的影響,制作了一臺原理樣機(jī),進(jìn)行了相關(guān)實驗驗證。隨后,本文將Z源逆變器的應(yīng)用拓展到隔離場合,提出一種不對稱全橋Z源逆變器,分析了該逆變器的工作原理,制作了原理樣機(jī)。為使Z源網(wǎng)絡(luò)工作于對稱狀態(tài)以減少采樣電路,同時減小Z源網(wǎng)絡(luò)中二極管的電壓應(yīng)力,提出對稱式全橋Z源逆變器,列出了其參數(shù)設(shè)計原則,制作了原理樣機(jī)并進(jìn)行實驗驗證。最后,為避免前級變換器橋臂直通,使整個系統(tǒng)依舊保持Z源可靠性高的特點,本文提出一種交錯雙管正激Z源逆變器,前級采用交錯雙管正激變換器。分析了該變換器的工作原理,列出了參數(shù)設(shè)計及主要的實現(xiàn)電路等,制作了相應(yīng)的原理樣機(jī)并驗證了理論分析的正確性。本文研究的高增益Z源逆變器,針對Z源逆變器的缺點,進(jìn)一步提升了電壓增益,在實現(xiàn)相同增益時采用了更短的橋臂直通時間,減小橋臂直通狀態(tài)下功率器件的導(dǎo)通損耗,提高效率。
[Abstract]:Wide input high gain inverter plays an important role in the field of new energy development. It converts the new energy output from low voltage DC to high voltage AC output. It has the advantages of no dead-time, small output waveform THD, high reliability, and has been widely concerned by scholars at home and abroad. While preserving the advantages of Z-source inverter, the voltage gain of the inverter is further enhanced. It is of great significance to meet the requirements of low input voltage of new energy generation. First of all, the topology of the coupled inductor class Z source inverter is derived, and the working principle and modulation strategy of this kind of inverter are introduced. The voltage gain, device stress and the volume of coupling inductor of this kind of inverter are compared, and the characteristics of Z-source inverter with coupling inductor are summarized. Secondly, based on the switching inductance quasi-Z-source inverter, By replacing a diode of the switch inductance unit with a capacitor, a basic boost unit quasi-Z source inverter is proposed. The working principle of the inverter and the characteristics of the inverter are analyzed. The voltage gain is further enhanced. Based on the basic booster unit quasi Z source inverter, a coupling inductance boost unit quasi Z source inverter is proposed, which reduces the use of a passive device. The coupling inductor leakage inductance is used to suppress the diode current peak. The effects of the coupling inductor turn ratio, leakage inductance, direct duty cycle ratio and input average current on the gain are analyzed. In this paper, the application of Z-source inverter is extended to the isolation situation, and an asymmetric full-bridge Z-source inverter is proposed. The working principle of the inverter is analyzed, and a prototype of the principle is made. In order to make the Z-source network work in symmetrical state to reduce the sampling circuit, At the same time, the voltage stress of diode in Z-source network is reduced, a symmetrical full-bridge Z-source inverter is proposed, the design principle of its parameters is listed, the prototype of the principle is made and verified by experiment. Finally, in order to avoid the straight-through of the bridge arm of the front converter, In this paper, an interleaved two-switch forward Z-source inverter is presented, in which the interleaved two-switch forward converter is used in the front stage. The working principle of the converter is analyzed. The parameter design and main realization circuits are listed, the corresponding principle prototype is made and the correctness of the theoretical analysis is verified. The high gain Z-source inverter studied in this paper has further enhanced the voltage gain in view of the shortcomings of the Z-source inverter. When the same gain is realized, a shorter through time is adopted to reduce the on-loss of the power device and improve the efficiency of the power device in the straight-through state of the bridge arm.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM464

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