本文選題：風(fēng)力發(fā)電 + 諧波建模　； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：近年來,風(fēng)電產(chǎn)業(yè)快速發(fā)展,其中,中大型風(fēng)力發(fā)電機(jī)組已在世界上40多個國家陸地和近海并網(wǎng)運(yùn)行。本碩士論文針對中大型風(fēng)電場中存在大量電纜敷設(shè)和海底電纜傳輸,其對地電容與感性電力系統(tǒng)之間相互作用,從而激發(fā)的諧波諧振問題以及風(fēng)電機(jī)組中電壓源換流器(voltage source converter,VSC)的輸出阻抗在部分頻域呈現(xiàn)負(fù)阻尼所帶來的諧波不穩(wěn)定問題進(jìn)行分析研究�；谀B(tài)敏感度分析、Nyquist判據(jù)等方法,本文研究大規(guī)模風(fēng)電接入的諧波諧振與諧波不穩(wěn)定現(xiàn)象,并提出抑制措施,以保障風(fēng)電場及其并入電網(wǎng)安全、穩(wěn)定、高效地運(yùn)行,主要工作有:(1)風(fēng)電場建模與諧振、諧波不穩(wěn)定問題分析方法�；趯Ρ晨勘承蚔SC諧波模型和異步電機(jī)諧波模型的研究進(jìn)一步建立隨風(fēng)速變化的雙饋風(fēng)力發(fā)電機(jī)的(doubly fed induction generator,DFIG)諧波模型。同時,建立風(fēng)電場的主要電氣設(shè)備部分諧波模型,主要包括:電纜、變壓器、電網(wǎng)側(cè)、無功補(bǔ)償裝置等諧波模型。對模態(tài)分析法、敏感度分析、Nyquist判據(jù)等諧波諧振、諧波不穩(wěn)定問題的研究方法進(jìn)行了分析研究。(2)風(fēng)電場諧波特性分析以及諧振機(jī)理研究。研究網(wǎng)側(cè)變換器(grid-side converter,GSC)和轉(zhuǎn)子側(cè)變換器(rotor-side converter,RSC)給風(fēng)電場注入諧波的規(guī)律。結(jié)合實(shí)測數(shù)據(jù),總結(jié)歸納了風(fēng)電場中的諧波規(guī)律。進(jìn)一步,利用頻率掃描法仿真分析拓?fù)浣Y(jié)構(gòu)變化、工況變化等不確定因素引起的不同諧振情況,以及各參數(shù)對諧振頻率、諧振幅值的大致影響規(guī)律。(3)基于敏感度分析法的諧波諧振研究及抑制策略。利用模態(tài)分析法研究了不同運(yùn)行工況、不同系統(tǒng)參數(shù)、不同模態(tài)的諧振規(guī)律,定義了節(jié)點(diǎn)敏感度指標(biāo),量化了風(fēng)電場中每個節(jié)點(diǎn)對諧振情況的影響,揭示諧振的滲透、傳播規(guī)律。利用敏感度分析法,進(jìn)一步定義阻抗敏感度指標(biāo)和頻率敏感度指標(biāo),為諧振問題的抑制提供依據(jù),深入量化了風(fēng)電場中各元件參數(shù)對風(fēng)電場每一次諧振的影響程度。并且利用頻率轉(zhuǎn)移法配合濾波器提出諧振抑制方案。(4)建立基于控制參數(shù)的VSC阻抗模型,探究風(fēng)電機(jī)中網(wǎng)側(cè)VSC輸出特性。探究諧波在VSC控制環(huán)中的傳輸、放大規(guī)律。進(jìn)一步利用Nyquist穩(wěn)定性判據(jù),分析了諧波不穩(wěn)定的影響因素。本碩士論文利用模態(tài)分析法,結(jié)合實(shí)測數(shù)據(jù)對風(fēng)電場的諧波諧振問題進(jìn)行了深度剖析與探究,進(jìn)一步研究了諧波不穩(wěn)定問題機(jī)理,可為風(fēng)電場諧振及不穩(wěn)定問題的相關(guān)研究提供支持。
[Abstract]:In recent years, wind power industry has developed rapidly. Among them, medium and large scale wind turbines have been connected to land and offshore in more than 40 countries in the world. In this thesis, there are a large number of cable laying and submarine cable transmission in large wind farms, and the interaction between the earth capacitance and the inductive power system is discussed. The harmonic resonance caused by the excitation and the harmonic instability caused by the partial negative damping of the output impedance of the voltage source converter (VSC) in the wind turbine are analyzed and studied. Based on the modal sensitivity analysis and Nyquist criterion, this paper studies the harmonic resonance and harmonic instability in large-scale wind power access, and puts forward some restraining measures to ensure the safe, stable and efficient operation of the wind farm and its integration into the power grid. The main work is: 1) wind farm modeling and resonance, harmonic instability analysis method. Based on the research of back-to-back VSC harmonic model and asynchronous motor harmonic model, a doubly fed induction generator harmonic model of doubly-fed wind turbine with wind speed variation is established. At the same time, the harmonic model of the main electrical equipment of wind farm is established, including: cable, transformer, power grid side, reactive power compensator and so on. The methods of modal analysis, sensitivity analysis and Nyquist criterion for harmonic resonance and harmonic instability are studied. The law of harmonic injection into wind farm by grid-side converterside GSC) and rotor-side converterside RSCs is studied. Combined with the measured data, the harmonic law in wind farm is summarized. Furthermore, the frequency scanning method is used to simulate and analyze the different resonant conditions caused by the uncertainties such as the change of topological structure and the change of working conditions, as well as the resonance frequency of each parameter. The effect of harmonic amplitude on harmonic resonance and its suppression strategy based on sensitivity analysis. The resonance law of different operating conditions, different system parameters and different modes is studied by using modal analysis method. The sensitivity index of nodes is defined, and the influence of each node on resonance in wind farm is quantified, and the penetration of resonance is revealed. The law of propagation. By using sensitivity analysis method, impedance sensitivity index and frequency sensitivity index are further defined to provide the basis for the suppression of resonance problem, and the influence degree of each element parameter in wind farm on each resonance of wind farm is quantified. The frequency transfer method and filter are used to establish the VSC impedance model based on the control parameters to explore the VSC output characteristics of the grid side of the wind motor. Probe into the law of harmonic transmission and amplification in VSC control loop. Furthermore, the influence factors of harmonic instability are analyzed by using Nyquist stability criterion. In this thesis, the harmonic resonance problem of wind farm is deeply analyzed and explored with modal analysis method and measured data, and the mechanism of harmonic instability problem is further studied. It can provide support for the research of wind farm resonance and instability.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM614;TM711

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本文編號：1783251