本文關(guān)鍵詞： 雙饋感應(yīng)風(fēng)力發(fā)電機(jī) DFIG機(jī)端相位跳變 網(wǎng)側(cè)變流器控制 定轉(zhuǎn)子故障電流 風(fēng)電場(chǎng)保護(hù)策略　出處：《華北電力大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：風(fēng)力發(fā)電與傳統(tǒng)火力發(fā)電的機(jī)理不同,故障后風(fēng)機(jī)電磁暫態(tài)特性發(fā)生較大變化。雙饋風(fēng)電的接入,使得電網(wǎng)結(jié)構(gòu)愈加復(fù)雜,可靠性與安全性難以得到有效的保障。因此,本文通過(guò)對(duì)電網(wǎng)對(duì)稱以及不對(duì)稱故障下雙饋風(fēng)電機(jī)組電磁暫態(tài)特性的研究;得到雙饋風(fēng)機(jī)在電網(wǎng)故障下定轉(zhuǎn)子電流瞬時(shí)表達(dá)式；并通過(guò)PSCAD仿真進(jìn)行驗(yàn)證。同時(shí)考慮到大規(guī)模雙饋風(fēng)電場(chǎng)接入電力系統(tǒng)時(shí)對(duì)電網(wǎng)中傳統(tǒng)保護(hù)的影響,提出針對(duì)風(fēng)電場(chǎng)匯流線路和風(fēng)電場(chǎng)送出線路的改進(jìn)保護(hù)策略,并通過(guò)PSCAD進(jìn)行故障仿真驗(yàn)證。 本文首先建立了雙饋發(fā)電系統(tǒng)不同坐標(biāo)系下的暫態(tài)數(shù)學(xué)模型,重點(diǎn)闡述了同步旋轉(zhuǎn)軸系下雙饋感應(yīng)電機(jī)的暫態(tài)模型及其常用坐標(biāo)變換；推導(dǎo)了DFIG網(wǎng)側(cè)與轉(zhuǎn)子側(cè)變流器的數(shù)學(xué)模型,分析了雙饋感應(yīng)風(fēng)力發(fā)電機(jī)的發(fā)電特性及運(yùn)行原理,并搭建了DFIG的PSCAD模型進(jìn)行仿真驗(yàn)證。 其次,本文在電網(wǎng)對(duì)稱和不對(duì)稱故障下,充分考慮DFIG機(jī)端電壓相位跳變、DFIG轉(zhuǎn)子側(cè)與網(wǎng)側(cè)變流器控制以及直流母線電壓的波動(dòng)對(duì)故障電流的影響。利用DFIG暫態(tài)數(shù)學(xué)模型分別推導(dǎo)出對(duì)稱與不對(duì)稱故障下DFIG能夠反映出暫態(tài)輸出特性的DFIG定轉(zhuǎn)子電流時(shí)域表達(dá)式并通過(guò)PSCAD仿真和動(dòng)模實(shí)驗(yàn)驗(yàn)證公式的正確性,并分析DFIG機(jī)端相位跳變以及雙饋風(fēng)機(jī)網(wǎng)側(cè)與轉(zhuǎn)子側(cè)變流器控制對(duì)故障電流的作用機(jī)理與影響程度。 由于雙饋風(fēng)電場(chǎng)自身的弱電源和故障特性,當(dāng)風(fēng)電場(chǎng)匯流線路或送出線路發(fā)生故障時(shí),傳統(tǒng)保護(hù)己不能可靠動(dòng)作。本文提出基于雙饋風(fēng)電場(chǎng)故障特性的匯流線路自適應(yīng)電流保護(hù)策略,基于故障穩(wěn)態(tài)量的風(fēng)電場(chǎng)送出線路電流縱聯(lián)差動(dòng)保護(hù)策略以及自適應(yīng)距離保護(hù)策略。并搭建含雙饋風(fēng)電場(chǎng)以及電網(wǎng)聯(lián)絡(luò)線的PSCAD模型分別對(duì)傳統(tǒng)保護(hù)和改進(jìn)保護(hù)策略進(jìn)行仿真驗(yàn)證與分析。為大規(guī)模雙饋風(fēng)電場(chǎng)接入電網(wǎng)時(shí)風(fēng)電場(chǎng)匯流線路以及送出線路保護(hù)新原理的研究和應(yīng)用提供了理論基礎(chǔ)。
[Abstract]:The mechanism of wind power generation is different from that of traditional thermal power generation, and the electromagnetic transient characteristics of the fan change greatly after the fault. The connection of double-fed wind power makes the power network structure more complex, and the reliability and security are difficult to be effectively guaranteed. In this paper, the electromagnetic transient characteristics of doubly-fed wind turbines under symmetrical and asymmetric faults are studied, and the transient expressions of stator and rotor currents are obtained. Considering the influence of large-scale doubly-fed wind farm on traditional protection in power network, the improved protection strategy for wind farm confluence line and wind farm output line is put forward. The fault is verified by PSCAD. In this paper, the transient mathematical model of doubly-fed induction motor in different coordinate systems is established, and the transient model of doubly-fed induction motor under synchronous rotation axis system and its common coordinate transformation are described. The mathematical models of DFIG grid-side and rotor-side converters are derived, and the generation characteristics and operation principle of doubly-fed induction wind generators are analyzed. The PSCAD model of DFIG is built for simulation verification. Secondly, in this paper, under the symmetrical and asymmetric fault of power network, The control of rotor side and grid side converter of DFIG machine and the influence of DC bus voltage fluctuation on the fault current are fully considered. Using the DFIG transient mathematical model, the DFIG energy under symmetric and asymmetric faults is derived, respectively. The time-domain expression of DFIG stator and rotor current can reflect the transient output characteristics, and the correctness of the formula is verified by PSCAD simulation and dynamic simulation. The effect mechanism and influence degree of the phase jump at the end of DFIG and the control of grid-side and rotor side converter of doubly-fed fan on the fault current are analyzed. Due to the weak power supply and fault characteristics of the doubly-fed wind farm itself, when the wind farm confluence line or the outgoing line fails, Traditional protection can not operate reliably. In this paper, an adaptive current protection strategy for confluence circuit based on fault characteristics of doubly-fed wind farm is proposed. Based on the fault steady-state value of wind farm, the current longitudinal differential protection strategy and adaptive distance protection strategy of wind farm are proposed. The PSCAD model with doubly-fed wind farm and power network tie line is built to protect the traditional protection and improve the protection strategy, respectively. It provides a theoretical basis for the research and application of the new principle of wind farm confluence line and transmission line protection when a large-scale doubly-fed wind farm is connected to the power grid.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM614

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本文編號(hào)：1555573