本文選題：電力電子變壓器　切入點：正弦功率傳輸　出處：《東北電力大學》2017年碩士論文

【摘要】：由于分布式電源的不斷增多,同時用戶用電需求的多樣化,傳統(tǒng)的城市交流配電網(wǎng)面臨越來越多的技術(shù)挑戰(zhàn)。未來城市配電網(wǎng)必然要以傳統(tǒng)城市交流配電網(wǎng)絡(luò)為支撐,從現(xiàn)有交流配電網(wǎng)變?yōu)橐粋�能夠?qū)崿F(xiàn)交流配電網(wǎng)、直流配電網(wǎng)以及交直流混合配電網(wǎng)的不同電壓等級互聯(lián)的新型配電網(wǎng)。電力電子變壓器是實現(xiàn)新型交直流混合配電網(wǎng)柔性變換的關(guān)鍵技術(shù),由于它的模塊化和可擴展性而得到廣泛應(yīng)用,而且能夠?qū)⒉煌~定電壓等級、不同性質(zhì)的兩個彼此獨立的交直流電網(wǎng)互聯(lián)起來,達到功率互相傳輸、穩(wěn)定協(xié)調(diào)控制的功能。然而電力電子變壓器也存在很多問題亟待解決,如三相級聯(lián)型電力電子變壓器的固有功率波動影響,導(dǎo)致其中間直流側(cè)電容體積過大,傳輸功率密度較小的問題。因此,如何簡單有效地解決這些問題成為本文研究分析的主要內(nèi)容。本文提出了一種基于LLC諧振變換器的三相級聯(lián)型電力電子變壓器正弦功率傳輸概念,減小其中間直流側(cè)電容,將交流側(cè)二倍頻率的功率波動傳遞到公共直流側(cè),并保證了恒定的直流電源,來解決電力電子變壓器固有功率波動問題。同時,當LLC諧振變換器工作在近似諧振模式下,可以簡單有效地實現(xiàn)正弦功率傳輸概念,并簡化電力電子變壓器控制結(jié)構(gòu)實現(xiàn)單級控制,使得三相級聯(lián)型電力電子變壓器的正弦功率傳輸可以得到更廣泛的應(yīng)用。雖然PET的正弦傳輸概念只有較小的功率因數(shù)調(diào)節(jié)的能力,但是它對于單向功率傳輸?shù)腜ET而言可以有效的減小電容和制造成本。本文根據(jù)三相電力電子變壓器拓撲結(jié)構(gòu)和正弦功率傳輸概念,對三相電力電子變壓器的工作特性進行了分析。最后,搭建并測試了基于LLC諧振變換器的三相電力電子變壓器試驗系統(tǒng),充分驗證了正弦功率傳輸概念的可行性和有效性。
[Abstract]:With the increasing of distributed generation and the diversification of users' demand, the traditional urban AC distribution network faces more and more technical challenges. In the future, the urban distribution network must be supported by the traditional urban AC distribution network. From an existing AC distribution network to an AC distribution network, The power electronic transformer is the key technology to realize the flexible transformation of the new AC / DC hybrid distribution network, which is a new type of distribution network interconnected with different voltage levels of the AC / DC hybrid distribution network. Because of its modularization and extensibility, it is widely used, and it can connect two independent AC / DC power grids with different rated voltage levels and different properties to transmit power to each other. However, there are many problems to be solved urgently, such as the influence of inherent power fluctuation of three-phase cascaded power electronic transformer, which leads to the excessive volume of capacitance in the middle DC side of power electronic transformer. The problem of low transmission power density. How to solve these problems simply and effectively becomes the main content of this paper. In this paper, a concept of sinusoidal power transmission of three-phase cascaded power electronic transformer based on LLC resonant converter is proposed to reduce the middle DC side capacitance. The power fluctuation of the double frequency of AC side is transferred to the common DC side, and a constant DC power supply is guaranteed to solve the inherent power fluctuation problem of power electronic transformer. At the same time, when the LLC resonant converter works in the approximate resonant mode, The concept of sinusoidal power transmission can be realized simply and effectively, and the control structure of power electronic transformer can be simplified to realize single-stage control. This makes the sinusoidal power transmission of three-phase cascaded power electronic transformers more widely used. Although PET's sinusoidal transmission concept has only a small power factor adjustment ability, However, it can effectively reduce the capacitance and manufacturing cost for unidirectional power transmission PET. In this paper, according to the topology of three-phase power electronic transformer and the concept of sinusoidal power transmission, The operating characteristics of three-phase power electronic transformer are analyzed. Finally, a three-phase power electronic transformer test system based on LLC resonant converter is built and tested, which fully verifies the feasibility and validity of the concept of sinusoidal power transmission.
【學位授予單位】：東北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM46;TM41

【參考文獻】

相關(guān)期刊論文 前10條

1 劉闖;徐鑫哲;劉海洋;齊瑞鵬;蔡國偉;;基于電流平衡單元的輸入并聯(lián)輸出并聯(lián)型LLC諧振變換器模塊[J];電工技術(shù)學報;2016年21期

2 張璐;唐巍;梁軍;李根;蔡永翔;;基于VSC的交直流混合中壓配電網(wǎng)功率 電壓協(xié)調(diào)控制[J];中國電機工程學報;2016年22期

3 李霞林;郭力;王成山;李運帷;;直流微電網(wǎng)關(guān)鍵技術(shù)研究綜述[J];中國電機工程學報;2016年01期

4 宗升;何湘寧;吳建德;李武華;趙榮祥;;基于電力電子變換的電能路由器研究現(xiàn)狀與發(fā)展[J];中國電機工程學報;2015年18期

5 王躍;楊昆;陳國柱;;級聯(lián)DSTATCOM補償不平衡負載分相控制策略[J];電力自動化設(shè)備;2015年05期

6 曹一家;劉易珠;闕凌燕;盧敏;李勇;黃小慶;辛建波;;換電站與電網(wǎng)協(xié)調(diào)的多目標雙層實時充放電調(diào)度方法[J];電力自動化設(shè)備;2015年04期

7 杜翼;江道灼;尹瑞;鄭歡;王玉芬;;直流配電網(wǎng)拓撲結(jié)構(gòu)及控制策略[J];電力自動化設(shè)備;2015年01期

8 陳章勇;許建平;王金平;張斐;;一種新型非調(diào)節(jié)隔離DC-DC變換器[J];電工技術(shù)學報;2014年12期

9 何湘寧;宗升;吳建德;李武華;趙榮祥;;配電網(wǎng)電力電子裝備的互聯(lián)與網(wǎng)絡(luò)化技術(shù)[J];中國電機工程學報;2014年29期

10 羅清t，

本文編號：1659948