【摘要】：在論述電網(wǎng)連鎖故障研究現(xiàn)狀的基礎(chǔ)上,分析了雙饋異步風(fēng)電機(jī)組(DFIG)的模型和控制機(jī)理；基于國(guó)網(wǎng)電科院研發(fā)的大電網(wǎng)分析軟件FASTEST以酒泉風(fēng)電基地電網(wǎng)為對(duì)象,研究了電壓、頻率的安全穩(wěn)定影響因素,總結(jié)了基地的主要連鎖故障模式�；诜謱臃謪^(qū)的控制思想,以及電網(wǎng)的安全穩(wěn)定控制體系,設(shè)計(jì)了風(fēng)電基地連鎖故障防御系統(tǒng)的各層功能,提出了阻斷連鎖故障的防御策略并通過(guò)實(shí)例驗(yàn)證了策略的有效性。 1)研究了DFIG的數(shù)學(xué)模型、有功、無(wú)功解耦控制技術(shù)、低電壓穿越機(jī)理與風(fēng)電場(chǎng)建模。在潮流計(jì)算中,當(dāng)風(fēng)電場(chǎng)采用恒功率因數(shù)控制時(shí),將節(jié)點(diǎn)處理為PQ節(jié)點(diǎn)；當(dāng)采用恒電壓控制時(shí),節(jié)點(diǎn)處理為PV節(jié)點(diǎn)(Q為有限值)。 2)研究了風(fēng)電出力水平、DFIG無(wú)功特性(含crowbar保護(hù))和無(wú)功補(bǔ)償設(shè)備對(duì)風(fēng)電場(chǎng)并網(wǎng)點(diǎn)的電壓穩(wěn)定影響,結(jié)論如下：(1)風(fēng)電場(chǎng)高有功出力會(huì)造成并網(wǎng)點(diǎn)電壓偏低(不計(jì)無(wú)功補(bǔ)償裝置)；(2)電網(wǎng)故障期間,DFIG在磁鏈衰減后將從電網(wǎng)中吸收無(wú)功,加重電網(wǎng)電壓的跌落程度,可能造成相鄰的風(fēng)電場(chǎng)群低電壓穿越失敗或機(jī)組crowbar保護(hù)連鎖動(dòng)作；(3)并聯(lián)電容器、SVC在電網(wǎng)正常運(yùn)行時(shí),能夠改善風(fēng)電基地的電壓水平,但是故障清除后瞬間可能產(chǎn)生無(wú)功過(guò)剩導(dǎo)致關(guān)鍵母線高壓越限。 3)分析了不同風(fēng)電有功出力比例與風(fēng)電機(jī)組的頻率保護(hù)定值對(duì)風(fēng)電基地電網(wǎng)頻率穩(wěn)定性的影響。結(jié)論如下：(1)風(fēng)電有功功率占總出力比例越大,風(fēng)電基地的頻率穩(wěn)定性越差、故障時(shí)頻率惡化的越快；(2)風(fēng)電機(jī)組的頻率保護(hù)定值不當(dāng)可能惡化電網(wǎng)故障期間的功率失衡,引發(fā)安控連鎖動(dòng)作。 4)總結(jié)了集群風(fēng)電基地連鎖故障的主要演化模式：(1)因風(fēng)電基地電壓?jiǎn)栴}導(dǎo)致風(fēng)電機(jī)組低壓高壓脫網(wǎng)；(2)風(fēng)電基地外送通道故障引起功率不平衡而導(dǎo)致機(jī)組因頻率保護(hù)連鎖故障；(3)故障后因潮流轉(zhuǎn)移引起風(fēng)電外送通道過(guò)載,導(dǎo)致電網(wǎng)側(cè)連鎖故障,進(jìn)而引發(fā)風(fēng)電基地側(cè)電壓或頻率問(wèn)題,導(dǎo)致風(fēng)機(jī)連鎖跳閘。 5)基于分層分區(qū)的控制思想和電網(wǎng)的安全穩(wěn)定系統(tǒng)體系,設(shè)計(jì)了風(fēng)電基地連鎖故障防御系統(tǒng)的各層功能,研究了風(fēng)電基地連鎖故障控制的時(shí)機(jī)與可用措施,提出了在線、離線一體化與預(yù)防控制、緊急控制、校正控制相結(jié)合的防御策略,考慮研究的穩(wěn)定影響因素調(diào)節(jié)控制解決電壓、頻率、過(guò)載等多種問(wèn)題引起的風(fēng)電基地連鎖故障。通過(guò)對(duì)連鎖故障實(shí)例的仿真驗(yàn)證,證明了該策略有效。
[Abstract]:On the basis of discussing the current situation of power network cascading fault research, this paper analyzes the model and control mechanism of doubly-fed asynchronous wind turbine (DFIG), and studies the voltage based on the large power network analysis software FASTEST, which is developed by the National Institute of electricity and Power Technology, and takes Jiuquan wind power base as the object. Frequency of safety and stability factors, summed up the base of the main cascading fault mode. Based on the control idea of stratification and partition and the safety and stability control system of power network, the functions of each layer of cascading fault defense system of wind power base are designed. The defense strategy of blocking cascading faults is put forward and the effectiveness of the strategy is verified by examples. 1) the mathematical model, active and reactive power decoupling control technology, low voltage traversing mechanism and wind farm modeling of DFIG are studied. In power flow calculation, when the wind farm adopts constant power factor control, the node is treated as PQ node, and when the constant voltage control is used, The node is treated as PV node (Q is finite value). 2) the effects of reactive power characteristics (including crowbar protection) and reactive power compensation equipment on voltage stability of wind farm are studied. The conclusions are as follows: (1) the high active power output of wind farm will result in the low voltage of parallel network (excluding the reactive power compensator); (2). During the fault period, the reactive power will be absorbed from the power network after the flux attenuation, and the drop degree of the voltage will be aggravated. It may cause low voltage traversing failure of adjacent wind farm groups or cascading action of unit crowbar protection. (3) shunt capacitor can improve the voltage level of wind power base when the power grid is in normal operation. However, the reactive power surplus may occur immediately after the fault clearing, which leads to the high voltage overrun of the key bus. 3) the influence of the ratio of active power output of wind power and the fixed value of frequency protection of wind turbine on the frequency stability of wind power base network is analyzed. The conclusions are as follows: (1) the greater the proportion of active power to the total output power, the worse the frequency stability of wind power base, and the faster the frequency deterioration during the failure; (2) the improper frequency protection of wind turbine units may aggravate the power imbalance during the fault period of power grid. The main evolution modes of cascading faults in cluster wind power base are summarized as follows: (1) the voltage problem of wind power base leads to the low-voltage and high-voltage decoupling of wind turbine units; (2) the power imbalance caused by the outputting channel fault of the wind power base leads to the cascading fault of frequency protection for the unit; (3) after the fault, the wind power supply channel overloads due to the power flow transfer, which results in the cascading fault on the power grid side. Thus causing voltage or frequency problems in wind power base, leading to cascading tripping of fan. 5) based on the control idea of stratification and partition and the system of safety and stability of power network, the functions of cascading fault defense system of wind power base are designed. This paper studies the timing and available measures of cascading fault control in wind power base, and puts forward a defense strategy combining on-line, off-line integration and preventive control, emergency control and correction control, and adjusts the control solution voltage considering the studied stability influence factors. Frequency, overload and other problems caused by wind power base cascading failures. The simulation results show that the strategy is effective.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM711

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 袁小明;;長(zhǎng)線路弱電網(wǎng)情況下大型風(fēng)電場(chǎng)的聯(lián)網(wǎng)技術(shù)(英文)[J];電工技術(shù)學(xué)報(bào);2007年07期

2 孟仲偉,魯宗相,宋靖雁;中美電網(wǎng)的小世界拓?fù)淠Ｐ捅容^分析[J];電力系統(tǒng)自動(dòng)化;2004年15期

3 薛禹勝;;時(shí)空協(xié)調(diào)的大停電防御框架 (一)從孤立防線到綜合防御[J];電力系統(tǒng)自動(dòng)化;2006年01期

4 薛禹勝;;時(shí)空協(xié)調(diào)的大停電防御框架 (二)廣域信息、在線量化分析和自適應(yīng)優(yōu)化控制[J];電力系統(tǒng)自動(dòng)化;2006年02期

5 王曉波;嚴(yán)干貴;鄭太一;范國(guó)英;王建勛;郭雷;董存;崔運(yùn)海;周志強(qiáng);;雙饋感應(yīng)風(fēng)電機(jī)組聯(lián)網(wǎng)運(yùn)行仿真及實(shí)證分析[J];電力系統(tǒng)自動(dòng)化;2008年07期

6 肖創(chuàng)英;汪寧渤;陟晶;丁坤;;甘肅酒泉風(fēng)電出力特性分析[J];電力系統(tǒng)自動(dòng)化;2010年17期

7 陳惠粉;喬穎;魯宗相;閔勇;;風(fēng)電場(chǎng)群的無(wú)功電壓協(xié)調(diào)控制策略[J];電力系統(tǒng)自動(dòng)化;2010年18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(shí)間的雙饋風(fēng)電機(jī)組低電壓穿越[J];電力系統(tǒng)自動(dòng)化;2010年18期

9 李丹;賈琳;許曉菲;王蓓;王寧;謝旭;;風(fēng)電機(jī)組脫網(wǎng)原因及對(duì)策分析[J];電力系統(tǒng)自動(dòng)化;2011年22期

10 薛峰;�？�;汪寧渤;;大規(guī)模間歇式能源發(fā)電并網(wǎng)集群協(xié)調(diào)控制框架[J];電力系統(tǒng)自動(dòng)化;2011年22期

相關(guān)博士學(xué)位論文 前5條

1 撖奧洋;變速恒頻風(fēng)力發(fā)電系統(tǒng)故障特性與保護(hù)技術(shù)研究[D];華中科技大學(xué);2010年

2 王英英;基于事故鏈的電力系統(tǒng)連鎖故障風(fēng)險(xiǎn)評(píng)估與預(yù)防控制研究[D];華中科技大學(xué);2010年

3 崔楊;大規(guī)模風(fēng)電場(chǎng)群聯(lián)網(wǎng)的源網(wǎng)協(xié)調(diào)性研究[D];華北電力大學(xué);2011年

4 王達(dá);緊急控制與校正控制的協(xié)調(diào)優(yōu)化[D];山東大學(xué);2009年

5 程孟增;雙饋風(fēng)力發(fā)電系統(tǒng)低電壓穿越關(guān)鍵技術(shù)研究[D];上海交通大學(xué);2012年

，

本文編號(hào)：2140049