本文選題：特高壓直流 + 風(fēng)電場��； 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：隨著社會經(jīng)濟(jì)的快速發(fā)展,我國對能源需求日益增長。這就要求我國在資源分布極度不均的情況下,進(jìn)行能源的優(yōu)化配置。近些年來為解決我國能源負(fù)荷供需矛盾,將在風(fēng)能資源集中的內(nèi)陸地區(qū)建設(shè)數(shù)個千萬千瓦級的大規(guī)模風(fēng)電基地。由于大多數(shù)風(fēng)電地區(qū)都表現(xiàn)出低負(fù)荷、弱電網(wǎng)的典型特征,因此風(fēng)電經(jīng)特高壓直流外送勢在必行。酒泉-湖南±800k V特高壓直流輸電就是規(guī)劃2014年開工建設(shè)的一條,計劃把甘肅酒泉地區(qū)的風(fēng)電、光伏通過特高壓直流送往湖南,實(shí)現(xiàn)大規(guī)模清潔能源的利用。但酒湖直流工程初期投運(yùn)仍然存在許多不穩(wěn)定因素。酒湖直流系統(tǒng)換相失敗引起交流電網(wǎng)過電壓的情況下,由于風(fēng)電場相對于常規(guī)火電廠抗干擾能力較差,所以多數(shù)風(fēng)力發(fā)電機(jī)組都面臨著被破壞的風(fēng)險,嚴(yán)重情況下可能造成大規(guī)模風(fēng)力發(fā)電機(jī)組大面積脫網(wǎng),直接威脅系統(tǒng)安全。針對以上問題,研究酒湖特高壓直流換相失敗對酒泉風(fēng)電的影響將成為熱點(diǎn)。目前,針對酒湖特高壓直流換相失敗的研究工作主要集中在對其的建模仿真,抑制由于換相失敗而產(chǎn)生的暫態(tài)過電壓策略等。本文依據(jù)酒湖特高壓直流實(shí)際工程數(shù)據(jù),基于PSCAD/EMTDC仿真平臺搭建了酒湖特高壓直流簡化模型。首先簡要闡述了如何搭建發(fā)電機(jī)、變壓器、大容量雙饋風(fēng)機(jī)等基本模型,并詳細(xì)介紹了各個模型在搭建過程中需要注意的問題和相關(guān)參數(shù)的設(shè)置;然后在搭建好的模型基礎(chǔ)上進(jìn)行了仿真試驗(yàn),驗(yàn)證了各個模型的正確性,通過各個模型的相互聯(lián)系和作用深入了解換相失敗故障對交流系統(tǒng)過電壓的影響,并探討了酒湖特高壓直流系統(tǒng)發(fā)生換相失敗對酒泉地區(qū)風(fēng)電場母線過電壓的影響。結(jié)合仿真結(jié)果,從原理上說明了影響風(fēng)電場母線過電壓的因素。最后參照國外對風(fēng)電場并網(wǎng)母線高電壓穿越的基本規(guī)范,提出了酒泉地區(qū)風(fēng)電場高壓穿越標(biāo)準(zhǔn)的初步性建議。最終,本文結(jié)合酒泉風(fēng)電高電壓穿越規(guī)范標(biāo)準(zhǔn),提出通過在酒泉風(fēng)電場并網(wǎng)母線安裝靜止無功補(bǔ)償器SVC來抑制暫態(tài)過電壓的策略,并通過仿真實(shí)驗(yàn)驗(yàn)證了該方案能夠在一定程度上避免過電壓的發(fā)生。
[Abstract]:With the rapid development of social economy, the energy demand of our country is increasing day by day. This requires our country in the extremely uneven distribution of resources, the optimal allocation of energy. In recent years, in order to solve the contradiction between supply and demand of energy load in China, tens of millions of kilowatts large scale wind power bases will be built in inland areas where wind energy resources are concentrated. Due to the typical characteristics of low load and weak power network in most wind power areas, it is imperative for wind power to be sent out through UHV DC. Jiuquan-Hunan 鹵800kV UHV HVDC transmission is one of the planned construction projects in 2014. It is planned to send wind power and photovoltaic energy from Jiuquan area of Gansu Province to Hunan through UHV DC to realize large-scale utilization of clean energy. However, there are still many unstable factors in the initial commissioning of Jiuhu DC project. In the case of AC grid overvoltage caused by the commutation failure of Jiuhu DC system, most wind turbines are at risk of being destroyed because of the poor anti-interference ability of wind farms relative to conventional thermal power plants. In serious cases, large scale wind turbines may be removed from the grid in a large area, which directly threatens the safety of the system. In view of the above problems, the research on the effect of UHV DC commutation failure on Jiuquan wind power will become a hot spot. At present, the research on DC commutation failure of Jiuhu UHVDC is mainly focused on modeling and simulation to suppress the transient overvoltage strategy caused by the commutation failure and so on. Based on the actual engineering data of UHV DC in Liquor Lake, a simplified model of UHV DC in Liquor Lake is built based on PSCAD/EMTDC simulation platform. Firstly, the basic models of generators, transformers and large capacity doubly-fed fans are briefly described, and the problems needing attention and the setting of related parameters in the process of building each model are introduced in detail. Then the simulation experiment is carried out on the basis of the established model, which verifies the correctness of each model. Through the mutual connection and function of each model, the influence of commutation failure fault on the AC system overvoltage is deeply understood. The effect of commutation failure in Jiuhu UHV DC system on the overvoltage of wind farm busbar in Jiuquan area is also discussed. Based on the simulation results, the factors affecting the overvoltage of wind farm busbar are explained in principle. Finally, referring to the basic standards of high voltage traversing of wind farm connected to grid bus, the paper puts forward the preliminary suggestion of high voltage crossing standard of wind farm in Jiuquan area. Finally, combining with the high voltage traversing standard of Jiuquan wind power plant, this paper puts forward a strategy to suppress transient overvoltage by installing static Var compensator (SVC) on the grid bus of Jiuquan wind farm. The simulation results show that the scheme can avoid overvoltage to some extent.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM721.1;TM315

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