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

【摘要】：隨著大氣污染的不斷加劇,風(fēng)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(fēng)力發(fā)電在電網(wǎng)中占的比例越來越大,國家電網(wǎng)對風(fēng)力發(fā)電機(jī)組提出了低電壓穿越的特性要求,風(fēng)力發(fā)電機(jī)組的安全穩(wěn)定運(yùn)行面臨新的挑戰(zhàn)。針對低電壓穿越條件下雙饋風(fēng)力發(fā)電機(jī)組機(jī)電耦合問題,研究電壓跌落下風(fēng)力發(fā)電機(jī)組傳動(dòng)鏈動(dòng)態(tài)響應(yīng)特性,對于保障雙饋風(fēng)力發(fā)電機(jī)及電網(wǎng)運(yùn)行安全具有重要意義。為準(zhǔn)確的探究并網(wǎng)雙饋風(fēng)力發(fā)電機(jī)組機(jī)電耦合作用,在分析雙饋風(fēng)力發(fā)電機(jī)組基本特性的基礎(chǔ)上,分別建立了雙饋風(fēng)力發(fā)電機(jī)組傳動(dòng)鏈及雙饋風(fēng)力發(fā)電機(jī)組的數(shù)學(xué)模型。在傳動(dòng)鏈建模時(shí),考慮到風(fēng)力機(jī)和發(fā)電機(jī)間的傳動(dòng)軸的柔性,建立了二、三、四、五個(gè)質(zhì)量塊的模型;闡述了雙饋風(fēng)力發(fā)電機(jī)組在不同質(zhì)量塊下的數(shù)學(xué)模型,并描述了雙饋風(fēng)力發(fā)電機(jī)組運(yùn)行狀態(tài)與功率之間的關(guān)系�；赑SCAD平臺對其進(jìn)行建模仿真,建立了不同質(zhì)量劃分條件下的1.5MW雙饋風(fēng)力發(fā)電機(jī)組機(jī)-電-網(wǎng)仿真模型,從剛度系數(shù)、互阻尼、自阻尼三個(gè)因素上分析了在電壓跌落時(shí)對傳動(dòng)鏈的波動(dòng)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(dòng)幅值越小,自阻尼越大,傳動(dòng)效率越低。等效為五質(zhì)量塊模型的傳動(dòng)軸系更能夠精確的反應(yīng)系統(tǒng)的動(dòng)態(tài)特性。最后針對電網(wǎng)電壓跌落下雙饋風(fēng)力發(fā)電機(jī)組的動(dòng)態(tài)響應(yīng)特性進(jìn)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(dòng)鏈被激起的波動(dòng)幅值越大,恢復(fù)到平衡值所需要的時(shí)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(dòng)鏈模型對雙饋風(fēng)力發(fā)電機(jī)組的無功功率等動(dòng)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(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM614

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