本文選題：DFIG + 機(jī)電暫態(tài)模型��； 參考：《華北電力大學(xué)(北京)》2017年碩士論文

【摘要】：近年來,世界能源需求持續(xù)增長,而化石能源的日漸枯竭和環(huán)境污染和氣候問題,使得風(fēng)力發(fā)電得到了快速發(fā)展。雙饋風(fēng)機(jī)(double-fed induction generator,DFIG)因其運(yùn)行穩(wěn)定的特性,在電力工業(yè)中得到了快速發(fā)展。然而,大規(guī)模雙饋風(fēng)電并網(wǎng)給系統(tǒng)帶來綠色能源的同時,也引發(fā)了新的穩(wěn)定問題,其中,暫態(tài)穩(wěn)定性問題得到了廣泛關(guān)注。有鑒于此,本文建立了適合于機(jī)電暫態(tài)分析的DFIG簡化模型,并研究了大規(guī)模風(fēng)電接入對系統(tǒng)暫態(tài)穩(wěn)定性的影響,主要工作如下:(1)研究了DFIG暫態(tài)過程中磁鏈和電流響應(yīng)的時間尺度及其影響因素首先推導(dǎo)了雙饋風(fēng)機(jī)的二階復(fù)系數(shù)微分方程;接著求取了暫態(tài)過程中,定轉(zhuǎn)子時間常數(shù)、磁鏈和電流自由響應(yīng)的近似解析解;進(jìn)一步,研究了故障位置及接地電阻對暫態(tài)時間尺度的影響,并基于此,分析了機(jī)電暫態(tài)中忽略定轉(zhuǎn)子暫態(tài)過程的適應(yīng)性。(2)建立了適合于機(jī)電暫態(tài)分析的DFIG簡化模型首先分析不同工況下,DFIG故障中與故障后的暫態(tài)及穩(wěn)態(tài)模型;接著忽略快時間尺度響應(yīng),進(jìn)行模型簡化處理,在簡化過程中不改變DFIG故障過程中的能量積累;進(jìn)一步,對簡化模型進(jìn)行誤差分析和仿真驗(yàn)證;最后,提出適合于機(jī)電暫態(tài)分析的DFIG模型。(3)分析了DFIG集中接入對單機(jī)無窮大系統(tǒng)功角特性曲線和暫態(tài)穩(wěn)定性的影響首先分析DFIG接入后,同步機(jī)的功角特性曲線的變化情況;接著,利用等面積定則、故障中電壓相量圖等方法,研究不同故障下DFIG故障后及故障中特性對暫態(tài)穩(wěn)定性的影響。(4)提出了基于暫態(tài)能量函數(shù)的DFIG集中接入對多機(jī)系統(tǒng)暫態(tài)穩(wěn)定性影響的分析方法首先介紹經(jīng)典能量函數(shù)及支路能量函數(shù)的概念,并討論不同能量函數(shù)之間的關(guān)系;接著,通過故障過程中機(jī)組的不同轉(zhuǎn)速對機(jī)組類型進(jìn)行劃分;進(jìn)一步,分別分析DFIG等容量替換轉(zhuǎn)速超前機(jī)組(群)、轉(zhuǎn)速落后機(jī)組(群)和中間轉(zhuǎn)速機(jī)組(群)后,對系統(tǒng)能量及暫態(tài)穩(wěn)定性變化,進(jìn)而定量分析大規(guī)模DFIG風(fēng)電接入對暫態(tài)穩(wěn)定的影響。
[Abstract]:In recent years, the world energy demand continues to increase, and the depletion of fossil energy, environmental pollution and climate problems, make the rapid development of wind power generation. Double-fed induction generator (DFIGG) has been developed rapidly in power industry because of its stable operation. However, the large-scale doubly-fed wind power grid brings green energy to the system, but it also brings about new stability problems, among which, the transient stability problem has been paid more and more attention. In view of this, a simplified DFIG model suitable for electromechanical transient analysis is established, and the influence of large-scale wind power access on the transient stability of the system is studied. The main work is as follows: (1) the time scale of flux and current response in DFIG transient process and its influencing factors are studied. First, the second order complex coefficient differential equation of doubly-fed fan is derived, and then the time constant of stator and rotor during transient process is obtained. The approximate analytical solution of the free response of flux and current. Furthermore, the influence of fault location and grounding resistance on the transient time scale is studied, and based on this, In this paper, the adaptability of neglecting the transient process of stator and rotor in electromechanical transient is analyzed. (2) A simplified DFIG model suitable for electromechanical transient analysis is established. First, the transient and steady-state models in and after the fault are analyzed under different working conditions. Then the fast time scale response is ignored and the simplified model is processed without changing the energy accumulation in the process of DFIG fault. Furthermore, the error analysis and simulation of the simplified model are carried out. Finally, This paper presents a DFIG model suitable for electromechanical transient analysis. (3) the influence of DFIG centralized access on power angle characteristic curve and transient stability of single machine infinite bus system is analyzed. First, the variation of power angle characteristic curve of synchronous machine after DFIG access is analyzed. Using equal area rule, voltage phasor diagram in fault, In this paper, the influence of DFIG fault and fault characteristics on transient stability is studied. (4) A method of analyzing the effect of DFIG centralized access based on transient energy function on transient stability of multi-machine system is proposed. Firstly, the classical energy function is introduced. The concept of number and branch energy function, The relationship between different energy functions is discussed. Then, the types of units are divided by the different rotational speeds of the units in the process of failure. The changes of system energy and transient stability of DFIG equal-capacity replacement speed advance unit (group), speed backward unit (group) and intermediate speed unit (group) are analyzed respectively, and the effect of large-scale DFIG wind power access on transient stability is analyzed quantitatively.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM712

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