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  本文選題：并網(wǎng)逆變器 + 分布式發(fā)電　； 參考：《燕山大學》2014年碩士論文

【摘要】：隨著太陽能、風能等可再生能源裝機容量的增加，可再生能源在我國未來能源結(jié)構(gòu)中的地位將會越來越重要。電力電子變換器在分布式發(fā)電(DG)系統(tǒng)和可再生能源集中并網(wǎng)系統(tǒng)中扮演了重要的角色。大電網(wǎng)中接入的DG系統(tǒng)越來越多，DG系統(tǒng)穩(wěn)定性會對大電網(wǎng)產(chǎn)生影響，同時大電網(wǎng)的波動也會影響DG系統(tǒng)的運行。電網(wǎng)電壓中的諧波和不平衡負序分量將會對分布式發(fā)電系統(tǒng)的輸出產(chǎn)生影響，，進而影響分布式發(fā)電并網(wǎng)系統(tǒng)運行的安全性和穩(wěn)定性。所以，研究三相并網(wǎng)逆變器的控制技術(shù)，抑制電網(wǎng)電壓中的諧波和不平衡負序分量對逆變器輸出的影響，保證并網(wǎng)逆變器在電網(wǎng)電壓畸變和不平衡情況下高效穩(wěn)定運行具有重要意義。 本文主要是針對三相并網(wǎng)逆變器控制策略進行討論和研究。首先介紹了分布式發(fā)電系統(tǒng)的發(fā)展概況以及并網(wǎng)逆變器控制策略的國內(nèi)外研究現(xiàn)狀。然后分析了LCL濾波器的參數(shù)設計及三相并網(wǎng)逆變器的建模，并對并網(wǎng)逆變器αβ軸電流的比例積分(PI)控制和比例諧振積分(PRI)控制的理論分析和仿真，仿真結(jié)果表明PRI控制在對交流量的無靜差控制方面是優(yōu)于PI控制的。針對電網(wǎng)電壓畸變和不平衡對并網(wǎng)逆變器控制的影響，在準PRI控制的基礎上，加上諧波諧振控制器(Resonant HamonicController，RESH)，得到準PRI+RESH控制器。分析了準PRI+RESH控制器的控制原理以及在應用上的局限性，從而設計出一種改進的控制策略，即準比例反饋諧振積分(Proportional-Feedback-Resonant-Integral，PFRI)+RESH控制策略。仿真結(jié)果表明，改進得到的準PFRI+RESH控制策略相對于改進前的控制策略，對整數(shù)次諧波附近的間諧波的抑制作用變好，對參考電流信號中基波分量的跟蹤更加精確，并網(wǎng)電流的THD值減小，獲得了更好的并網(wǎng)電流質(zhì)量。 搭建了以TMS320F2812為主控芯片的3KW三相并網(wǎng)逆變器實驗平臺，并在此基礎上對本文中提到的控制策略進行了實驗驗證。實驗結(jié)果表明本文設計的控制策略能夠在電網(wǎng)電壓畸變且不平衡情況下改善并網(wǎng)電流質(zhì)量，保證逆變器高效穩(wěn)定運行。
[Abstract]:With the increase of the installed capacity of renewable energy such as solar energy and wind energy, the status of renewable energy will become more and more important in the future energy structure of our country. Power electronic converter plays an important role in distributed generation DG system and renewable energy centralized grid-connected system. More and more DG systems connected to large power grids will have an impact on the stability of DG systems, and the fluctuation of large power grids will also affect the operation of DG systems. The harmonic and unbalanced negative sequence components in the grid voltage will affect the output of the distributed generation system, and then affect the security and stability of the distributed grid connected system. Therefore, the control technology of three-phase grid-connected inverter is studied to suppress the influence of harmonic and unbalanced negative sequence components in grid voltage on the output of inverter. It is of great significance to ensure the efficient and stable operation of grid-connected inverter under the condition of voltage distortion and imbalance. The control strategy of three-phase grid-connected inverter is discussed and studied in this paper. Firstly, the development of distributed generation system and the research status of grid-connected inverter control strategy at home and abroad are introduced. Then, the parameter design of the LCL filter and the modeling of the three-phase grid-connected inverter are analyzed. The theoretical analysis and simulation of the proportional integral control and the proportional resonance integral control of the 偽 尾 axis current of the grid-connected inverter are presented. The simulation results show that PRI control is superior to Pi control in the static error control of AC quantity. Aiming at the influence of voltage distortion and imbalance on the control of grid-connected inverter, the quasi-PRI RESH controller is obtained by adding the harmonic resonance controller Resonant Hamonic Controller on the basis of quasi-PRI control. The control principle of quasi-PRI RESH controller and its limitation in application are analyzed, and an improved control strategy is designed, that is, the quasi-proportional feedback resonance integral control strategy, which is called quasi-proportional feedback resonance integral control strategy. The simulation results show that the improved quasi-PFRI RESH control strategy has better suppression effect on the interharmonics near integer harmonics and more accurate tracking of the fundamental component in the reference current signal compared with the control strategy before the improvement. The THD value of grid-connected current is reduced and better grid-connected current quality is obtained. The experimental platform of 3KW three-phase grid-connected inverter based on TMS320F2812 is built, and the control strategy mentioned in this paper is verified experimentally. The experimental results show that the proposed control strategy can improve the grid-connected current quality and ensure the efficient and stable operation of the inverter under the condition of voltage distortion and unbalance.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM464

【參考文獻】

相關期刊論文 前10條

1 劉飛;查曉明;段善旭;;三相并網(wǎng)逆變器LCL濾波器的參數(shù)設計與研究[J];電工技術(shù)學報;2010年03期

2 章瑋;王宏勝;任遠;胡家兵;賀益康;;不對稱電網(wǎng)電壓條件下三相并網(wǎng)型逆變器的控制[J];電工技術(shù)學報;2010年12期

3 白志紅;阮新波;徐林;;基于LCL濾波器的并網(wǎng)逆變器的控制策略[J];電工技術(shù)學報;2011年S1期

4 黃如海;謝少軍;;基于比例諧振調(diào)節(jié)器的逆變器雙環(huán)控制策略研究[J];電工技術(shù)學報;2012年02期

5 王成山;李鵬;;分布式發(fā)電、微網(wǎng)與智能配電網(wǎng)的發(fā)展與挑戰(zhàn)[J];電力系統(tǒng)自動化;2010年02期

6 張憲平;;LCL濾波的雙饋式風電網(wǎng)側(cè)變流器在不平衡電網(wǎng)電壓條件下的控制策略[J];電力自動化設備;2011年10期

7 馬琳;金新民;唐芬;Pedro Rodrigue;孫凱;;三相并網(wǎng)逆變器比例諧振控制及其網(wǎng)壓前饋問題分析[J];電工技術(shù)學報;2012年08期

8 劉波;楊旭;孔繁麟;葉海忠;于虹;;三相光伏并網(wǎng)逆變器控制策略[J];電工技術(shù)學報;2012年08期

9 徐友;鄭建勇;梅軍;張卿杰;;空間相位解析的三相并網(wǎng)逆變器不平衡控制策略[J];電工技術(shù)學報;2013年04期

10 吳春華;陳國呈;丁海洋;武慧;宋丹;;一種新型光伏并網(wǎng)逆變器控制策略[J];中國電機工程學報;2007年33期

相關博士學位論文 前2條

1 馬琳;無變壓器結(jié)構(gòu)光伏并網(wǎng)逆變器拓撲及控制研究[D];北京交通大學;2011年

2 劉飛;三相并網(wǎng)光伏發(fā)電系統(tǒng)的運行控制策略[D];華中科技大學;2008年

本文編號：1945549