發(fā)布時(shí)間：2018-03-17 22:14

  本文選題：Z源逆變器　切入點(diǎn)：升壓單元　出處：《蘭州交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,光伏與風(fēng)電等新能源的開發(fā)與利用受到了廣泛重視。Z源逆變器具有單級可調(diào)壓特性,彌補(bǔ)了傳統(tǒng)電壓源型與電流源型逆變器的不足,在新能源并網(wǎng)領(lǐng)域備受青睞。傳統(tǒng)Z源逆變器升壓能力低,耐壓能力差,功率低;而改進(jìn)拓?fù)?雖然提高了升壓能力,但結(jié)構(gòu)復(fù)雜且多集中在兩電平結(jié)構(gòu);近些年雖然有Z源三電平與五電平結(jié)構(gòu)被提出,提高了功率,但升壓能力沒有提升。針對以上問題,提出了五種新型Z源逆變器拓?fù)?并研究了其調(diào)制策略與并網(wǎng)應(yīng)用,研究內(nèi)容主要包括:(1)將傳統(tǒng)Z源兩電平逆變器中的電感用升壓單元代替,提出了一種新型Z源兩電平逆變器電路,闡述了該拓?fù)涞墓ぷ髟?分析了三種PWM調(diào)制與一種SVPWM調(diào)制方法,并將新型拓?fù)渑c傳統(tǒng)型和幾種改進(jìn)型兩電平Z源逆變器拓?fù)渥髁藢Ρ确治觥?2)為簡化三電平Z源逆變器拓?fù)浜吞岣咝?分別提出了基于升壓單元的Z源和準(zhǔn)Z源T型三電平逆變器電路,分析了其工作原理,推理了升壓能力與直通時(shí)間的關(guān)系,對比了載波同相層疊PWM與載波反相層疊PWM的調(diào)制方法。為實(shí)現(xiàn)準(zhǔn)Z源T型三電平逆變器的中點(diǎn)電位平衡,設(shè)計(jì)了一種階梯波加雙調(diào)制波的調(diào)制策略,并將新型拓?fù)渑c傳統(tǒng)Z源三電平二極管鉗位拓?fù)渥髁藢Ρ确治觥?3)為改進(jìn)傳統(tǒng)五電平逆變器拓?fù)?設(shè)計(jì)了一種新的T型五電平逆變器電路。為提高Z源逆變器功率等級和輸出電能質(zhì)量,提出Z源T型五電平逆變器拓?fù)浜透咴鲆鎆源T型五電平逆變器拓?fù)?分析了新型拓?fù)涔ぷ髟�、直通狀態(tài)的插入方法以及載波同相層疊PWM策略,并將新型拓?fù)渑c傳統(tǒng)Z源五電平二極管鉗位拓?fù)渥髁藢Ρ确治觥?4)針對新能源并網(wǎng)系統(tǒng)直流側(cè)電壓不穩(wěn)定的問題,建立了基于新型Z源兩電平逆變器的并網(wǎng)模型,并設(shè)計(jì)了Z源網(wǎng)絡(luò)的參數(shù)。針對以上研究做了大量仿真實(shí)驗(yàn),結(jié)果表明:新型兩電平、T型三電平與T型五電平Z源逆變器均具有較強(qiáng)的升降壓能力并降低了電容與開關(guān)器件的電壓應(yīng)力;T型三電平與T型五電平Z源逆變器結(jié)構(gòu)簡單并消除了鉗位二極管損耗;雙調(diào)制波加階梯波的調(diào)制方法有效抑制了Z源T型三電平逆變器的中點(diǎn)電位波動(dòng);載波同相層疊PWM策略實(shí)現(xiàn)了T型五電平、新型Z源T型及高增益Z源T型五電平逆變器的穩(wěn)定運(yùn)行;基于新型兩電平Z源逆變器的并網(wǎng)系統(tǒng)有效解決了分布式發(fā)電系統(tǒng)直流側(cè)電壓不穩(wěn)定的問題。
[Abstract]:In recent years, the development and utilization has been paid attention to by.Z source inverter with single stage pressure adjustable characteristics of new energy photovoltaic and wind power etc., overcomes the shortcoming of the traditional voltage source and current source inverter, favored in the new energy grid. The inverter boost ability of traditional Z source low voltage power ability is poor. Low; and improved topology, while improving the ability of boost, but the structure is complex and more concentrated in the two level structure in recent years; although there are Z source of three level and five level structure is put forward, and improve the power, but the boost capacity did not improve. To solve the above problems, the paper introduced five new kinds of Z source inverter topology, and research the modulation strategy and network applications, the research content mainly includes: (1) the traditional inductance Z source inverter of two level instead of boosting unit, put forward a new type of circuit Z source two level inverter, expounds the working principle of the topology. Analysis, three kinds of PWM modulation and a SVPWM modulation method, and the new topology with the traditional type and several improved two level Z source inverter topology is compared. (2) to simplify the three level Z source inverter topology and improve efficiency are put forward based on boosting unit circuit Z source and Z the source T three level inverter, analyzes its working principle, the relationship between the boost ability and time through reasoning, carrier phase disposition modulation method and carrier phase PWM stacked PWM were compared. The midpoint potential balance to achieve the quasi Z source T three level inverter, designed the modulation strategy of double modulation of a ladder wave, and the new topology with traditional Z source three level diode clamped topology were analyzed. (3) in order to improve the traditional topology of five level inverter, a new circuit T five level inverter. In order to improve the design of Z source inverter power rating and The output power quality, the topology of Z source T five level inverter and high gain Z source T five level inverter, analyzes the principle of the new topology, direct insertion method and carrier phase disposition strategy of PWM state, and the new topology with traditional Z source five level diode clamped topology is compared. (4) according to the new energy grid system of DC voltage instability problems, a new Z source grid model based on two level inverter, and design parameters of Z source network. In view of the above research done a large number of simulation experiments, the results show that the new T two level, three level and five level Z T the source inverter has the strong ability of lifting pressure and reduce the voltage stress of the switches and capacitors; T three level T and five level structure of Z source inverter is simple and eliminates clamp diode loss; double modulation wave and ladder wave modulation The method can effectively restrain the fluctuation of neutral point potential Z source T three level inverter; carrier phase disposition PWM method to achieve the T five level, stable operation of the new type and high gain T Z source Z source T five level inverter; grid connected system model of two level Z source inverter effectively solves the DC Distributed power system side based on the problem of voltage instability.

【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM464

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