本文選題：風(fēng)力發(fā)電 + 電壓跌落�。� 參考：《中國石油大學(xué)(華東)》2014年碩士論文

【摘要】：多數(shù)大規(guī)模風(fēng)力發(fā)電場處于比較偏僻的區(qū)域,電網(wǎng)相對薄弱,特別是電網(wǎng)電壓存在較大跌落的可能,大規(guī)模的風(fēng)電機(jī)組解列將會(huì)嚴(yán)重威脅電力系統(tǒng)的安全運(yùn)行,為此,通常需要風(fēng)電機(jī)組具備電網(wǎng)故障條件下的穿越能力。針對電網(wǎng)故障條件下雙饋感應(yīng)發(fā)電機(jī)低電壓穿越控制的研究已成為近年來的研究熱點(diǎn)。雙饋感應(yīng)發(fā)電機(jī)的控制主要采用矢量控制,獲得準(zhǔn)確的定子磁鏈角是矢量控制中實(shí)現(xiàn)雙饋感應(yīng)發(fā)電機(jī)系統(tǒng)準(zhǔn)確解耦的關(guān)鍵,理想電網(wǎng)電壓條件下,通常采用基于電壓模型的磁鏈觀測算法觀測定子磁鏈,然而,傳統(tǒng)磁鏈觀測算法大都采用低通濾波器代替純積分,會(huì)引入幅值相位誤差,通常需要準(zhǔn)確地獲取電機(jī)同步角頻率用于補(bǔ)償誤差或者用于動(dòng)態(tài)調(diào)整低通濾波器的截止頻率來消除誤差。為了提高傳統(tǒng)定子磁鏈觀測算法的精度,本文首先研究了雙饋感應(yīng)電機(jī)同步角頻率估計(jì)方法。電網(wǎng)較大跌落條件下,雙饋感應(yīng)電機(jī)定子磁鏈可能會(huì)產(chǎn)生負(fù)序和暫態(tài)直流分量,這將會(huì)影響傳統(tǒng)定子磁鏈觀測算法的精度和速度,使雙饋感應(yīng)發(fā)電機(jī)系統(tǒng)無法獲得準(zhǔn)確解耦,近而影響低電壓穿越控制算法的有效實(shí)現(xiàn)。為了實(shí)現(xiàn)電網(wǎng)故障條件下雙饋感應(yīng)發(fā)電機(jī)系統(tǒng)的準(zhǔn)確解耦,本文進(jìn)一步研究了新型的定子磁鏈觀測算法。電網(wǎng)較大跌落條件下,定子磁鏈中的暫態(tài)直流分量和負(fù)序分量是引起轉(zhuǎn)子過電流的重要原因,為了防止轉(zhuǎn)子側(cè)過電流的出現(xiàn)、確保發(fā)電機(jī)的安全與穩(wěn)定運(yùn)行,必須抑制定子磁鏈暫態(tài)直流分量以及負(fù)序分量對發(fā)電機(jī)轉(zhuǎn)子側(cè)的不良影響�，F(xiàn)有的控制策略通常需要提取出定子磁鏈各序分量進(jìn)而用于控制,因此,研究電網(wǎng)較大跌落條件下定子磁鏈各序分量的準(zhǔn)確、快速提取算法具有重要意義。本文具體研究內(nèi)容如下:提出使用二階廣義積分器-鎖頻環(huán)(second order generalized integrator-frequency locked loop,SOGI-FLL)估計(jì)異步電機(jī)同步角頻率的方法,并對其頻率響應(yīng)性能進(jìn)行理論分析和仿真驗(yàn)證。構(gòu)建了基于異步電機(jī)矢量控制的轉(zhuǎn)速電流雙閉環(huán)調(diào)速系統(tǒng)實(shí)驗(yàn)平臺(tái),將SOGI-FLL估計(jì)出的同步角頻率用于磁鏈觀測算法中,實(shí)驗(yàn)結(jié)果驗(yàn)證了所提方案的有效性。提出使用雙二階廣義積分器鎖頻環(huán)(dual second order generalized integratorfrequency locked loop,DSOGI-FLL)估計(jì)異步電機(jī)同步角頻率的新方法,理論分析和實(shí)驗(yàn)研究表明,該方法可使同步角頻率估計(jì)速度不受反電勢信號幅值、頻率變化的影響,并能消除同步角頻率估計(jì)結(jié)果中2倍頻波動(dòng)成分。提出直接使用DSOGI-FLL進(jìn)行定子磁鏈觀測的方案,理論分析表明,該方案無需補(bǔ)償環(huán)節(jié),本質(zhì)為閉環(huán)系統(tǒng)且可以有效抑制定子反電勢中的高次諧波和低頻干擾成分。對該算法的頻率響應(yīng)特性進(jìn)行了研究,仿真和實(shí)驗(yàn)研究表明,該算法具有優(yōu)異的穩(wěn)態(tài)、動(dòng)態(tài)性能,可實(shí)現(xiàn)定子磁鏈的準(zhǔn)確觀測。提出電網(wǎng)故障條件下基于DSOGI-FLL的定子磁鏈正序、負(fù)序分量提取算法,理論分析了該算法實(shí)現(xiàn)定子磁鏈各序分量提取的原理,搭建了雙饋感應(yīng)發(fā)電機(jī)風(fēng)電系統(tǒng)模型,仿真驗(yàn)證了該算法的有效性。
[Abstract]:Most large-scale wind farms are in a relatively remote area, the power grid is relatively weak, especially the potential of a large drop in the voltage of the power grid. The large-scale wind turbine disassembly will seriously threaten the safe operation of the power system. For this reason, the wind turbine usually needs the crossing ability under the condition of the power grid failure. The research on low voltage crossing control of doubly fed induction generator has become a research hotspot in recent years. The control of doubly fed induction generator is mainly used in vector control. Obtaining accurate stator flux angle is the key to realize accurate decoupling of doubly fed induction generator system in vector control. Under ideal voltage conditions, electricity is usually based on electricity. The magnetic chain observation algorithm of the pressure model observes the stator flux. However, the traditional flux observation algorithms mostly use the low pass filter instead of the pure integral, which will introduce the amplitude phase error. It usually needs to accurately obtain the synchronous angle frequency of the motor to compensate the error or to adjust the cut-off frequency of the low pass filter to eliminate the error. The precision of the traditional stator flux observation algorithm is first studied in this paper. In this paper, the synchronous angular frequency estimation method of doubly fed induction motor is first studied. The stator flux of doubly fed induction motor may produce negative and transient DC components under the condition of large fall, which will affect the precision and speed of the traditional stator flux observation algorithm and make the doubly fed induction generator system In order to realize the accurate decoupling of the doubly fed induction generator system under the condition of the power grid fault, the new stator flux observation algorithm is further studied in this paper. The transient DC component and the negative sequence component in the stator flux linkage are the transient DC component and the negative sequence component. In order to prevent the overcurrent of the rotor, in order to prevent the occurrence of the rotor side overcurrent and ensure the safe and stable operation of the generator, the transient DC component of the stator flux and the negative effect of the negative sequence component on the rotor side of the generator must be suppressed. The current control strategy usually needs to extract the sequence components of the stator flux and then use it for control. Therefore, it is of great significance to study the accuracy of the sequence components of the stator flux under the condition of large drop in the power grid. The contents of this paper are as follows: the method of using the Nikai Hiroyoshi integrator - second order generalized integrator-frequency locked loop, SOGI-FLL to estimate the synchronous angle frequency of the asynchronous motor is proposed. The experimental platform of speed and current double closed loop speed control system based on vector control of asynchronous motor is constructed. The synchronous angular frequency estimated by SOGI-FLL is used in the magnetic chain observation algorithm. The experimental results verify the effectiveness of the proposed scheme. A double two order generalized integrator lock is proposed. The frequency ring (dual second order generalized integratorfrequency locked loop, DSOGI-FLL) is a new method for estimating synchronous angular frequency of asynchronous motor. The theoretical analysis and experimental study show that the method can make the speed of synchronous angular frequency estimation not affected by the amplitude of the back EMF signal and the frequency change, and can eliminate the 2 times of the frequency estimation results of the synchronous angle. The frequency fluctuation component. A scheme of stator flux observation using DSOGI-FLL is proposed. The theoretical analysis shows that the scheme does not need compensation link. It is essentially closed loop system and can effectively suppress the high harmonic and low frequency interference components in the stator back EMF. The frequency response characteristics of the algorithm are studied. Simulation and experimental research show that The algorithm has excellent steady state and dynamic performance, and can realize the accurate observation of stator flux. The algorithm of positive sequence and negative sequence component extraction based on DSOGI-FLL based stator flux is proposed under the condition of power grid fault. The principle of realizing the extraction of each sequence component of stator flux is theoretically analyzed, and the model of the doubly fed induction generator wind power system is built, and the simulation is verified. The effectiveness of the algorithm is proved.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM346

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