本文選題：光伏發(fā)電　切入點(diǎn)：三電平　出處：《北京交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：多電平逆變器具有輸出電壓諧波含量低、電磁干擾小、輸出濾波器體積小等優(yōu)點(diǎn),有助于光伏并網(wǎng)系統(tǒng)提高效率,減小體積,在光伏發(fā)電領(lǐng)域中具有廣泛的應(yīng)用前景。本文以單相多電平光伏并網(wǎng)逆變器為研究對(duì)象,在對(duì)單相控制系統(tǒng)進(jìn)行分析的基礎(chǔ)上,對(duì)單相三電平光伏并網(wǎng)逆變器以及一種具有共模電流抑制能力的多電平混合級(jí)聯(lián)型光伏并網(wǎng)逆變器進(jìn)行了研究。 本文首先對(duì)光伏并網(wǎng)發(fā)電系統(tǒng)的體系分類及并網(wǎng)逆變器種類進(jìn)行了介紹。針對(duì)單相并網(wǎng)控制策略,研究了幾種調(diào)節(jié)器對(duì)于雙閉環(huán)控制系統(tǒng)中交流電流環(huán)的影響,其中重點(diǎn)分析了比例諧振調(diào)節(jié)器的控制效果。 隨后研究了對(duì)稱型及非對(duì)稱型單相三電平逆變器的工作方式及其結(jié)構(gòu)中三電平橋臂對(duì)于逆變器輸出、損耗等方面的影響,分析了其各自的應(yīng)用領(lǐng)域,并針對(duì)這兩種逆變器的直流側(cè)中心點(diǎn)電位平衡方式進(jìn)行了研究。 本文在傳統(tǒng)非隔離型三電平半橋光伏并網(wǎng)逆變器的基礎(chǔ)上,重點(diǎn)對(duì)一種多電平混合級(jí)聯(lián)型光伏并網(wǎng)逆變器進(jìn)行了研究,該結(jié)構(gòu)在降低逆變器直流輸入側(cè)電壓等級(jí)的同時(shí),可以進(jìn)一步減小輸出電壓諧波含量,從而降低了開關(guān)頻率,減小了濾波電感體積。文中對(duì)其工作狀態(tài)及共模模型進(jìn)行了分析,并由此得出了逆變器的最佳調(diào)制方式以及一種基于該方式的直流支撐電容電壓控制策略,并根據(jù)該電路的死區(qū)效應(yīng)給出了一種死區(qū)補(bǔ)償方式。 針對(duì)單相多電平逆變器SPWM調(diào)制方式占用系統(tǒng)資源多的問(wèn)題,對(duì)其進(jìn)行改進(jìn),給出了一種單載波SPWM實(shí)現(xiàn)方式,并將該方式應(yīng)用于非對(duì)稱型單相三電平逆變器及多電平混合級(jí)聯(lián)型逆變器的調(diào)制過(guò)程中。介紹了一種矢量調(diào)制方式,分析了上述兩種方法的優(yōu)缺點(diǎn)。 最后,搭建了單相三電平逆變器及多電平混合級(jí)聯(lián)型逆變器的實(shí)驗(yàn)平臺(tái),通過(guò)實(shí)驗(yàn)驗(yàn)證了本文對(duì)于對(duì)稱型及非對(duì)稱型單相三電平逆變器和混合級(jí)聯(lián)型逆變器輸出特性的分析結(jié)論,以及混合級(jí)聯(lián)型逆變器直流支撐電容電壓控制策略和單載波SPWM調(diào)制方式的可行性。
[Abstract]:Multilevel inverter has the advantages of low output voltage harmonic content, small electromagnetic interference and small output filter size, which is helpful to improve the efficiency and reduce the volume of photovoltaic grid-connected system. In this paper, the single-phase multilevel photovoltaic grid-connected inverter is taken as the research object, and the single-phase control system is analyzed. The single-phase three-level photovoltaic grid-connected inverter and a multi-level hybrid cascade photovoltaic grid-connected inverter with common mode current suppression capability are studied. In this paper, the classification of photovoltaic grid-connected generation system and the type of grid-connected inverter are introduced, and the influence of several regulators on AC current loop in double-closed-loop control system is studied in view of single-phase grid-connected control strategy. The control effect of proportional resonant regulator is analyzed. Then, the working mode of symmetrical and asymmetric single-phase three-level inverter and the influence of tri-level leg on the output and loss of inverter are studied, and their respective application fields are analyzed. The DC-side center-point potential balance of these two inverters is studied. Based on the traditional three-level half-bridge photovoltaic grid-connected inverter, this paper focuses on a hybrid cascaded photovoltaic grid-connected inverter. This structure reduces the voltage level of DC input side of the inverter at the same time. The harmonic content of the output voltage can be further reduced, thus the switching frequency and the volume of the filter inductor can be reduced. The working state and the common mode model of the filter inductor are analyzed in this paper. The optimal modulation mode of the inverter and a DC supported capacitor voltage control strategy based on this mode are obtained, and a dead-time compensation method is given according to the dead-time effect of the circuit. Aiming at the problem that the SPWM modulation mode of single-phase multilevel inverter occupies more system resources, this paper improves it, and presents a single carrier SPWM implementation method. This method is applied to the modulation process of asymmetric single-phase three-level inverter and multilevel hybrid cascaded inverter. A vector modulation method is introduced, and the advantages and disadvantages of the two methods are analyzed. Finally, the experimental platform of single-phase three-level inverter and multilevel hybrid cascaded inverter is built. The analysis of the output characteristics of symmetric and asymmetric single-phase three-level inverters and hybrid cascaded inverters is verified by experiments. The feasibility of DC-supported capacitor voltage control strategy and single carrier SPWM modulation for hybrid cascade inverter is presented.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM464

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