本文選題：雙饋感應風力發(fā)電機　切入點：次同步振蕩　出處：《南京理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：近年來,風能作為一種可持續(xù)的清潔能源在我國得到了迅猛的發(fā)展,但是由于我國地理條件比較特殊,風力發(fā)電中心遠離負荷中心,因此需要遠距離輸電。串聯(lián)電容補償輸電方式可以實現(xiàn)電能的遠距離、大容量輸送,是一種成熟而又經(jīng)濟的技術(shù),在風電外送中得到了廣泛的應用。然而,雙饋感應風力發(fā)電機(DoubleFedInductionGenerator,DFIG)經(jīng)過串補線路并網(wǎng)運行時,會導致系統(tǒng)發(fā)生次同步振蕩(Sub-synchronous Oscillations,SSO)現(xiàn)象。風電場次同步振蕩是電氣系統(tǒng)和風電機組之間以低于系統(tǒng)同步頻率的某個或多個頻率顯著交換能量,造成電壓、電流及輸出功率的振蕩,并威脅風力發(fā)電機的安全和電力系統(tǒng)的穩(wěn)定,因此對雙饋風電場經(jīng)串補并網(wǎng)系統(tǒng)的次同步振蕩研究具有重要的理論與實際意義。首先建立了雙饋感應發(fā)電機、串補輸電線路的數(shù)學模型,對雙饋風機的轉(zhuǎn)子側(cè)及網(wǎng)側(cè)變流器的數(shù)學模型及控制策略作了詳細的介紹,并推導出了影響雙饋風機次同步振蕩的主要因素。然后在實時數(shù)字仿真平臺(Real Time Digital Simulator,RTDS)中搭建了含串補線路的風電并網(wǎng)系統(tǒng)模型,通過在仿真實驗中改變風速、線路的串聯(lián)補償度、風機運行臺數(shù)以及轉(zhuǎn)子側(cè)和網(wǎng)側(cè)控制器的參數(shù)探討風電場次同步振蕩特性,總結(jié)出了風機在工作條件和運行參數(shù)變化時次同步振蕩的規(guī)律。然后通過對風機匯集點電壓、電流和功率進行傅里葉頻譜分析,從中分離出了工頻分量和次同步分量。由匯集點次同步振蕩功率的方向和次同步電壓與額定電壓的關(guān)系組成了復合判據(jù),對風電場中的主要振蕩源進行有效的識別;根據(jù)線路電流中次同步分量大小建立了保護裝置的啟動判據(jù)和動作判據(jù),并完成了次同步振蕩保護樣機的開發(fā)。最后通過繼電保護儀加量完成了對樣機的實驗驗證,實驗結(jié)果表明:SSP-522次同步振蕩監(jiān)控裝置計算準確,邏輯合理,動作迅速,達到了預定目標。
[Abstract]:In recent years, wind energy, as a kind of sustainable clean energy, has been developing rapidly in China. However, because of the special geographical conditions in China, wind power generation center is far away from load center. So long distance transmission is needed. Series capacitor compensation can realize long distance and large capacity transmission of electric energy. It is a mature and economical technology and has been widely used in wind power outputting. When DoubleFedInduction Generator (DFIGG) is connected to the grid through a series compensation line, The sub-synchronous oscillation of the wind farm is the significant exchange of energy between the electrical system and the wind turbine at one or more frequencies lower than the synchronous frequency of the system, resulting in oscillations in voltage, current and output power. It also threatens the safety of wind turbine and the stability of power system. Therefore, it is of great theoretical and practical significance to study the sub-synchronous oscillation of doubly-fed wind farm through series-compensated grid connected system. Firstly, a doubly-fed induction generator is established. The mathematical model of series compensation transmission line, the mathematical model and control strategy of rotor side converter and grid side converter of doubly fed fan are introduced in detail. The main factors influencing the sub-synchronous oscillation of doubly-fed fan are deduced, and then a wind power grid-connected system model with series compensation circuit is built in the real Time Digital simulator RTDSs, and the wind speed is changed in the simulation experiment. Discussion on the subsynchronous oscillation characteristics of wind farm, the series compensation degree of the line, the number of fan operating stations and the parameters of the rotor side and grid side controllers, The law of sub-synchronous oscillation of fan when its working conditions and operating parameters are changed is summarized. Then the Fourier spectrum analysis of the voltage, current and power of fan gathering point is carried out. The power frequency component and the sub-synchronous component are separated from each other. The composite criterion is composed of the direction of the sub-synchronous oscillation power and the relation between the sub-synchronous voltage and the rated voltage, which can effectively identify the main oscillation sources in the wind farm. According to the magnitude of the sub-synchronous component in the line current, the starting criterion and the action criterion of the protection device are established, and the development of the sub-synchronous oscillation protection prototype is completed. Finally, the experimental verification of the prototype is completed through the addition of the relay protection instrument. The experimental results show that the control device of the SSP-522 synchronous oscillation is accurate, logical and quick, and achieves the predetermined goal.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM614;TM712

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