雙饋型風電機組低電壓穿越技術研究
發(fā)布時間：2019-04-20 11:48
【摘要】：隨著人們環(huán)保意識的增強，風能作為一種清潔的可再生能源，受到了世界各國的高度重視，風力發(fā)電已成為各國能源發(fā)展戰(zhàn)略的重要方向。隨著風電穿透功率的急劇增加，風力發(fā)電對地區(qū)電網穩(wěn)定性的影響不容忽視。雙饋感應發(fā)電機以其調速范圍寬、有功和無功功率可獨立調節(jié)以及所需勵磁變流器容量較小等優(yōu)點而成為主流機型。雙饋型風電機組經過背靠背雙PWM（Pulse WidthModulation，PWM）變流器跟電網相連，，由于雙饋風電機組的機構特點，當電網電壓跌落時，風電機組脫網運行會對電網的穩(wěn)定性造成嚴重影響。因此，低電壓穿越技術的研究成為熱點問題，勢必對電網短路故障下雙饋機組不間斷運行能力進行深入研究。 本文以變速恒頻雙饋感應發(fā)電機組為對象展開研究。首先，分析了雙饋風電機組的運行特性及相關控制原理，介紹了網側PWM變流器的矢量控制策略；其次，針對電網發(fā)生三相短路故障，機端電壓跌落時雙饋感應電機的暫態(tài)過程進行了分析；然后，詳細介紹了對電壓大值跌落最有效的低電壓穿越方法--轉子Crowbar電路。細致列出了各國電網對風電并網的要求，針對Crowbar保護，講述了其運行原理，并對其電阻阻值進行了整定。仿真分析了Crowbar保護電阻阻值不同和切除時間不同對機組低電壓穿越的影響，結果表明，在合理的取值范圍內，Crowbar的取值越大，對機組的低電壓穿越性能越好；Crowbar保護在故障切除一個周波后退出運行，對機組的低電壓穿越性能越好；最后，根據(jù)Crowbar保護投入后網側變流器的不同運行方式，制定了網側變流器低電壓穿越的控制方法，并與Crowbar保護相結合，提出了低電壓穿越的協(xié)調控制策略，通過仿真對其可行性進行驗證。
[Abstract]:With the increasing awareness of environmental protection, wind energy, as a clean and renewable energy, has been paid great attention by many countries in the world. Wind power generation has become an important direction of energy development strategy in all countries. With the rapid increase of the penetration power of wind power, the influence of wind power generation on the stability of regional power grid should not be ignored. Doubly-fed induction generator has become the mainstream model because of its wide range of speed regulation, independent regulation of active and reactive power and small capacity of excitation converter. The double-fed wind turbine is connected to the grid through the back-to-back dual-PWM (Pulse WidthModulation,PWM converter. Due to the characteristics of the doubly-fed wind turbine, when the grid voltage drops, the off-grid operation of the wind turbine will have a serious impact on the stability of the grid. Therefore, the research of low-voltage traversal technology has become a hot issue, and it is bound to carry on in-depth research on the uninterrupted operation capability of doubly-fed units under short-circuit fault in power network. In this paper, the variable-speed constant-frequency doubly-fed induction generator set is studied. Firstly, the operation characteristics and related control principle of doubly-fed wind turbine are analyzed, and the vector control strategy of PWM converter on the network side is introduced. Secondly, the transient process of doubly-fed induction machine is analyzed when there is a three-phase short circuit fault in the power network, and then the rotor Crowbar circuit, which is the most effective low voltage traversal method for large voltage sag, is introduced in detail. The requirements of wind power grid in various countries are listed in detail. According to the Crowbar protection, the operation principle is described, and the resistance value of the wind power grid is adjusted. The influence of different resistance value of Crowbar protection and different cutting time on the low voltage traversal of the unit is analyzed by simulation. The results show that the larger the value of Crowbar is, the better the low voltage traversal performance of the unit is. The better the low voltage traversal performance of the unit is, the better the Crowbar protection will be when the fault is removed after a cycle of fault is removed from operation. Finally, according to the different operation modes of the grid-side converter after the Crowbar protection is put into operation, the control method of the low-voltage traversal of the network-side converter is formulated, and combined with the Crowbar protection, the coordinated control strategy of the low-voltage traversal is put forward. The feasibility of this method is verified by simulation.
【學位授予單位】：東北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM614
本文編號：2461581
[Abstract]:With the increasing awareness of environmental protection, wind energy, as a clean and renewable energy, has been paid great attention by many countries in the world. Wind power generation has become an important direction of energy development strategy in all countries. With the rapid increase of the penetration power of wind power, the influence of wind power generation on the stability of regional power grid should not be ignored. Doubly-fed induction generator has become the mainstream model because of its wide range of speed regulation, independent regulation of active and reactive power and small capacity of excitation converter. The double-fed wind turbine is connected to the grid through the back-to-back dual-PWM (Pulse WidthModulation,PWM converter. Due to the characteristics of the doubly-fed wind turbine, when the grid voltage drops, the off-grid operation of the wind turbine will have a serious impact on the stability of the grid. Therefore, the research of low-voltage traversal technology has become a hot issue, and it is bound to carry on in-depth research on the uninterrupted operation capability of doubly-fed units under short-circuit fault in power network. In this paper, the variable-speed constant-frequency doubly-fed induction generator set is studied. Firstly, the operation characteristics and related control principle of doubly-fed wind turbine are analyzed, and the vector control strategy of PWM converter on the network side is introduced. Secondly, the transient process of doubly-fed induction machine is analyzed when there is a three-phase short circuit fault in the power network, and then the rotor Crowbar circuit, which is the most effective low voltage traversal method for large voltage sag, is introduced in detail. The requirements of wind power grid in various countries are listed in detail. According to the Crowbar protection, the operation principle is described, and the resistance value of the wind power grid is adjusted. The influence of different resistance value of Crowbar protection and different cutting time on the low voltage traversal of the unit is analyzed by simulation. The results show that the larger the value of Crowbar is, the better the low voltage traversal performance of the unit is. The better the low voltage traversal performance of the unit is, the better the Crowbar protection will be when the fault is removed after a cycle of fault is removed from operation. Finally, according to the different operation modes of the grid-side converter after the Crowbar protection is put into operation, the control method of the low-voltage traversal of the network-side converter is formulated, and combined with the Crowbar protection, the coordinated control strategy of the low-voltage traversal is put forward. The feasibility of this method is verified by simulation.
【學位授予單位】：東北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM614
【參考文獻】
相關期刊論文 前10條
1 劉志星;胡嬋娟;年珩;程鵬;;雙饋風電變流器低電壓穿越下Crowbar電阻的優(yōu)化設計[J];大功率變流技術;2012年01期
2 李建林;;風電系統(tǒng)中大功率逆變器拓撲結構分析綜述[J];變頻器世界;2009年05期
3 嚴干貴;王茂春;穆鋼;崔楊;周志強;戴武昌;;雙饋異步風力發(fā)電機組聯(lián)網運行建模及其無功靜態(tài)調節(jié)能力研究[J];電工技術學報;2008年07期
4 胡家兵;孫丹;賀益康;趙仁德;;電網電壓驟降故障下雙饋風力發(fā)電機建模與控制[J];電力系統(tǒng)自動化;2006年08期
5 姚駿;廖勇;;基于Crowbar保護控制的交流勵磁風電系統(tǒng)運行分析[J];電力系統(tǒng)自動化;2007年23期
6 胡家兵;賀益康;;雙饋風力發(fā)電系統(tǒng)的低壓穿越運行與控制[J];電力系統(tǒng)自動化;2008年02期
7 王曉波;嚴干貴;鄭太一;范國英;王建勛;郭雷;董存;崔運海;周志強;;雙饋感應風電機組聯(lián)網運行仿真及實證分析[J];電力系統(tǒng)自動化;2008年07期
8 朱曉東;石磊;陳寧;朱凌志;劉皓明;劉雋;;考慮Crowbar阻值和退出時間的雙饋風電機組低電壓穿越[J];電力系統(tǒng)自動化;2010年18期
9 穆鋼;王健;嚴干貴;崔楊;黃亞峰;安軍;;雙饋型風電機群近滿載工況下連鎖脫網事件分析[J];電力系統(tǒng)自動化;2011年22期
10 李丹;賈琳;許曉菲;王蓓;王寧;謝旭;;風電機組脫網原因及對策分析[J];電力系統(tǒng)自動化;2011年22期
本文編號：2461581
本文鏈接：http://sikaile.net/kejilunwen/dianlilw/2461581.html
教材專著
