本文選題：低電壓穿越　切入點：雙饋風力發(fā)電機組　出處：《華北電力大學》2017年碩士論文

【摘要】：隨著大氣污染的不斷加劇,風能的開發(fā)和利用在國家的能源戰(zhàn)略地位越來越重要。風力發(fā)電在電網(wǎng)中占的比例越來越大,國家電網(wǎng)對風力發(fā)電機組提出了低電壓穿越的特性要求,風力發(fā)電機組的安全穩(wěn)定運行面臨新的挑戰(zhàn)。針對低電壓穿越條件下雙饋風力發(fā)電機組機電耦合問題,研究電壓跌落下風力發(fā)電機組傳動鏈動態(tài)響應特性,對于保障雙饋風力發(fā)電機及電網(wǎng)運行安全具有重要意義。為準確的探究并網(wǎng)雙饋風力發(fā)電機組機電耦合作用,在分析雙饋風力發(fā)電機組基本特性的基礎上,分別建立了雙饋風力發(fā)電機組傳動鏈及雙饋風力發(fā)電機組的數(shù)學模型。在傳動鏈建模時,考慮到風力機和發(fā)電機間的傳動軸的柔性,建立了二、三、四、五個質(zhì)量塊的模型;闡述了雙饋風力發(fā)電機組在不同質(zhì)量塊下的數(shù)學模型,并描述了雙饋風力發(fā)電機組運行狀態(tài)與功率之間的關(guān)系�；赑SCAD平臺對其進行建模仿真,建立了不同質(zhì)量劃分條件下的1.5MW雙饋風力發(fā)電機組機-電-網(wǎng)仿真模型,從剛度系數(shù)、互阻尼、自阻尼三個因素上分析了在電壓跌落時對傳動鏈的波動的影響。仿真結(jié)果表明,剛度系數(shù)越小振蕩越激烈,互阻尼越大,波動幅值越小,自阻尼越大,傳動效率越低。等效為五質(zhì)量塊模型的傳動軸系更能夠精確的反應系統(tǒng)的動態(tài)特性。最后針對電網(wǎng)電壓跌落下雙饋風力發(fā)電機組的動態(tài)響應特性進行分析。對不同電壓跌落深度的仿真分析表明,電壓跌落深度越大,傳動鏈被激起的波動幅值越大,恢復到平衡值所需要的時間變長。對跌落程度相同條件下不同質(zhì)量塊模型仿真分析結(jié)果表明,不同質(zhì)量塊傳動鏈模型對雙饋風力發(fā)電機組的無功功率等動態(tài)特性影響不大,但是對轉(zhuǎn)矩、轉(zhuǎn)速等有較大影響。
[Abstract]:As air pollution intensifies, the development and utilization of wind energy plays an increasingly important role in the country's energy strategy. The State Grid has put forward the characteristic requirements of low voltage traversing for wind turbines, and the safe and stable operation of wind turbines faces new challenges. In view of the electromechanical coupling problem of doubly-fed wind turbines under low-voltage traversing conditions, a new challenge is presented. It is of great significance to study the dynamic response characteristics of wind turbine transmission chain under voltage drop to ensure the safety of doubly-fed wind turbine and power grid. Based on the analysis of the basic characteristics of the doubly-fed wind turbine, the mathematical models of the transmission chain of the doubly-fed wind turbine and the double-fed wind turbine are established respectively. Considering the flexibility of the drive shaft between the wind turbine and the generator, the model of two, three, four and five mass blocks is established, and the mathematical model of the doubly-fed wind turbine under different mass blocks is expounded. The relationship between operation state and power of doubly-fed wind turbine is described. Based on modeling and simulation of doubly-fed wind turbine generator set based on PSCAD platform, a simulation model of 1.5MW doubly-fed wind turbine generator generator with different quality partition is established, which is based on stiffness coefficient. The effects of mutual damping and self-damping on the fluctuation of transmission chain during voltage drop are analyzed. The simulation results show that the smaller the stiffness coefficient is, the more intense the oscillation is, and the greater the mutual damping is, the smaller the fluctuation amplitude is, the greater the self-damping is. The lower the transmission efficiency is, the more accurate dynamic characteristics of the system can be obtained by the transmission shaft system equivalent to the five-mass block model. Finally, the dynamic response characteristics of the doubly-fed wind turbine under the voltage drop of the power grid are analyzed. The simulation analysis of the same voltage drop depth shows that, The greater the voltage drop depth, the greater the amplitude of the fluctuation of the transmission chain, and the longer the time needed to recover to the equilibrium value. The simulation results of different mass block models under the same drop degree show that, Different mass block transmission chain models have little effect on the dynamic characteristics such as reactive power of doubly-fed wind turbine, but have great influence on torque, speed and so on.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM614

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