本文選題：電能質(zhì)量　切入點(diǎn)：UPQC　出處：《北京交通大學(xué)》2014年碩士論文

【摘要】：針對全世界范圍內(nèi)能源的匱乏、能源利用效率的瓶頸、環(huán)境污染問題等,世界各國相繼開展微電網(wǎng)的研究。微電網(wǎng)利用分布式發(fā)電污染少、能源利用率高、安裝地點(diǎn)靈活等優(yōu)點(diǎn),是大電網(wǎng)的有力補(bǔ)充和有效支撐。微電網(wǎng)中分布式電源(DG)適當(dāng)?shù)娜萘亢秃侠淼奈恢檬俏㈦娫从行Ю煤陀脩舭踩秒姷谋Ｕ?基于此,本文提出了一種具有低碳環(huán)保,高效利用,優(yōu)質(zhì)電能質(zhì)量的微電網(wǎng)結(jié)構(gòu)。 針對微電網(wǎng)結(jié)構(gòu)中出現(xiàn)的電能質(zhì)量問題,本文提出了一種基于改進(jìn)型UPQC結(jié)構(gòu)的微電網(wǎng)控制策略,其具體結(jié)構(gòu)就是在傳統(tǒng)UPQC結(jié)構(gòu)左側(cè)增加了一個(gè)動態(tài)電壓恢復(fù)器(DVR),利用它們之間的協(xié)調(diào)控制來改善微電網(wǎng)中的電能質(zhì)量問題。本文提出的控制策略分為改進(jìn)型間接控制和改進(jìn)型直接控制,其可以有效的補(bǔ)償主電網(wǎng)電壓跌落、過電壓、電壓畸變和校正電壓不平衡度,還可以補(bǔ)償由微電網(wǎng)中非線性和不平衡負(fù)荷帶來的諧波電流和不平衡電流問題。并網(wǎng)變流器的拓?fù)浣Y(jié)構(gòu)是由三相四橋臂構(gòu)成的,包括串聯(lián)變流器和并聯(lián)變流器。在串并聯(lián)變流器補(bǔ)償電網(wǎng)電壓和電流的同時(shí),不僅解決了串并聯(lián)變流器耦合帶來的干擾,而且實(shí)現(xiàn)了微電網(wǎng)合理的功率分配。尤其通過改進(jìn)微電網(wǎng)公共連接點(diǎn)的UPQC結(jié)構(gòu)(在UPQC左側(cè)增加一個(gè)DVR),提出了改進(jìn)型最小能量電壓跌落補(bǔ)償法,克服了傳統(tǒng)補(bǔ)償算法的缺陷,確保了負(fù)載電壓的相角不會發(fā)生突變,不僅提高了DG補(bǔ)償電壓的能力和范圍,而且降低了變流器的容量和成本。 在檢測環(huán)節(jié)中,針對電網(wǎng)中電壓畸變及不平衡情況,利用比例諧振(PR)調(diào)節(jié)器對特定次頻率的有效跟蹤來實(shí)現(xiàn)零穩(wěn)態(tài)誤差,本文利用了基于諧振式PLL改進(jìn)型最小能量的檢測法,有效地削弱了因電網(wǎng)畸變和不平衡帶來的檢測干擾。 本文提出的微電網(wǎng)控制策略還可以減少微電網(wǎng)并網(wǎng)和孤島模式轉(zhuǎn)換時(shí)對微電網(wǎng)的沖擊,在主電網(wǎng)故障清楚后可以實(shí)現(xiàn)微電網(wǎng)再次并網(wǎng)。最后針對改進(jìn)型間接和改進(jìn)型直接兩種控制策略的優(yōu)缺點(diǎn),提出了其相應(yīng)的DG應(yīng)用場合。采用Matlab仿真,在Simulink里設(shè)置了各種工況,仿真實(shí)驗(yàn)結(jié)果驗(yàn)證了本文提出的控制策略的有效性和優(yōu)越性。
[Abstract]:In view of the shortage of energy, the bottleneck of energy use efficiency and the environmental pollution in the whole world, countries all over the world have carried out research on microgrid, which makes use of distributed generation less pollution and higher energy efficiency. The advantages of flexible installation location are the powerful supplement and effective support of large power grid. The proper capacity and reasonable position of DGG in microgrid are the guarantee of the effective utilization of micro-power source and the safe use of electricity by users. In this paper, a low carbon environmental protection, efficient utilization, high quality power quality microgrid structure is proposed. Aiming at the problem of power quality in microgrid structure, a new control strategy based on improved UPQC structure is proposed in this paper. Its specific structure is to add a dynamic voltage restorer to the left side of the traditional UPQC structure to improve the power quality problem in the microgrid by using the coordinated control between them. The control strategy proposed in this paper is divided into improved indirect control strategy. Control and improved direct control, It can effectively compensate for voltage drop, overvoltage, voltage distortion and correction voltage imbalance. The harmonic current and unbalanced current caused by nonlinear and unbalanced load in microgrid can also be compensated. The topology of grid-connected converter is composed of three-phase four-leg. Including series converters and parallel converters. While the series-parallel converter compensates the grid voltage and current, it not only solves the interference caused by the coupling of the series-parallel converter, Especially by improving the UPQC structure of the common connection point of microgrid (adding a DVR to the left side of UPQC), an improved minimum energy voltage sag compensation method is proposed, which overcomes the defects of the traditional compensation algorithm. It ensures that the phase angle of the load voltage does not change, which not only improves the capacity and range of the DG compensation voltage, but also reduces the capacity and cost of the converter. In the detection link, aiming at the voltage distortion and unbalance in the power network, the effective tracking of the specific secondary frequency by the proportional resonant PR-regulator is used to realize the zero steady-state error. In this paper, the detection method based on the resonant PLL modified minimum energy is used to detect the zero steady-state error. It effectively weakens the detection interference caused by the distortion and imbalance of the power network. The microgrid control strategy proposed in this paper can also reduce the impact on the microgrid when the microgrid is connected and the islanding mode is converted. After the fault of the main power network is clear, the microgrid can be connected again. Finally, aiming at the advantages and disadvantages of the improved indirect control strategy and the improved direct control strategy, the corresponding DG application situation is put forward. The Matlab simulation is used to set up various working conditions in the Simulink. Simulation results show the effectiveness and superiority of the proposed control strategy.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM761

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 孫馳,畢增軍,魏光輝;基于空間矢量電流調(diào)節(jié)器的三相四橋臂逆變器的解耦控制研究[J];電工電能新技術(shù);2003年03期

2 阮新波,嚴(yán)仰光;四橋臂三相逆變器的控制策略[J];電工技術(shù)學(xué)報(bào);2000年01期

3 孫進(jìn),侯振義,蘇彥民;三相四臂對逆變電源控制方法的研究[J];電工技術(shù)學(xué)報(bào);2004年04期

4 耿攀;戴珂;魏學(xué)良;張凱;康勇;;三相并聯(lián)型有源電力濾波器電流重復(fù)控制[J];電工技術(shù)學(xué)報(bào);2007年02期

5 魯宗相;王彩霞;閔勇;周雙喜;呂金祥;王云波;;微電網(wǎng)研究綜述[J];電力系統(tǒng)自動化;2007年19期

6 王正仕;林金燕;陳輝明;李超;;不平衡非線性負(fù)載下分布式供電逆變器的控制[J];電力系統(tǒng)自動化;2008年01期

7 周念成;池源;王強(qiáng)鋼;;含非線性及不平衡負(fù)荷的微電網(wǎng)控制策略[J];電力系統(tǒng)自動化;2011年09期

8 徐海亮;章瑋;胡家兵;賀益康;周鵬;;電網(wǎng)電壓不平衡及諧波畸變時(shí)基波電壓同步信號的檢測[J];電力系統(tǒng)自動化;2012年05期

9 譚智力;李勛;陳堅(jiān);;基于p-q-r理論的UPQC直接控制策略[J];電力自動化設(shè)備;2006年11期

10 蔡林海;荊平;武守遠(yuǎn);李惠勛;;動態(tài)電壓恢復(fù)器控制策略研究[J];電力自動化設(shè)備;2007年11期

相關(guān)博士學(xué)位論文 前3條

1 龔宇雷;微電源并網(wǎng)同步檢測與定功率輸出控制技術(shù)研究[D];山東大學(xué);2011年

2 譚智力;不平衡及非線性條件下三相四線UPQC的控制策略研究[D];華中科技大學(xué);2007年

3 梁祖權(quán);統(tǒng)一電能質(zhì)量調(diào)節(jié)器檢測與控制技術(shù)研究[D];哈爾濱工業(yè)大學(xué);2008年

，

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