【摘要】：隨著社會科技的發(fā)展,新型發(fā)電技術(shù)越來越成熟,其中風(fēng)力發(fā)電的發(fā)展速度尤為明顯。風(fēng)電還具有很高的商業(yè)價(jià)值和環(huán)保價(jià)值,其前景不可限量,但是,風(fēng)力發(fā)電也有他的不足之處,風(fēng)資源的隨機(jī)性和波動性都會對其可控性造成影響。相比于傳統(tǒng)發(fā)電方式,風(fēng)力發(fā)電還有很大的進(jìn)步空間。風(fēng)電并網(wǎng)會造成區(qū)域電網(wǎng)電壓失穩(wěn)等不良影響,這是目前熱門的研究方向。本文的研究對象是某個(gè)實(shí)際電網(wǎng)A,當(dāng)電網(wǎng)A中接入風(fēng)電場時(shí)研究其電壓穩(wěn)定性的變化,分別對系統(tǒng)的靜態(tài)電壓與暫態(tài)電壓的穩(wěn)定性做出研究,通過在PSD-BPA程序中建立電網(wǎng)A的模型來研究風(fēng)電場的接入對區(qū)域電網(wǎng)電壓穩(wěn)定性的影響,具體工作如下所示:(1)以容量為2MW的雙饋型風(fēng)力發(fā)電機(jī)為研究對象,構(gòu)建了風(fēng)力發(fā)電系統(tǒng)整體數(shù)學(xué)模型,包括:風(fēng)輪模型,雙饋型風(fēng)力發(fā)電機(jī)模型,變流器模型,以及控制系統(tǒng)模型。(2)分析了電力系統(tǒng)電壓失穩(wěn)的靜態(tài)機(jī)理和動態(tài)機(jī)理,包括電壓失穩(wěn)的判斷依據(jù)。明確負(fù)荷裕度作為靜態(tài)電壓穩(wěn)定性的判據(jù);在分析暫態(tài)電壓穩(wěn)定性時(shí)考慮了風(fēng)速波動和線路故障對其影響。(3)構(gòu)建某電網(wǎng)A的系統(tǒng)模型,對其靜態(tài)電壓穩(wěn)定性進(jìn)行研究。計(jì)算風(fēng)電場不同連接方式下變電站節(jié)點(diǎn)電壓的U-Q靈敏度;分析風(fēng)電場不同連接方式對變電站電壓產(chǎn)生的影響,對電網(wǎng)A中安裝固定無功補(bǔ)償設(shè)備和提高風(fēng)電機(jī)組機(jī)端電壓兩種運(yùn)行方式進(jìn)行比較。(4)針對電網(wǎng)A的暫態(tài)電壓穩(wěn)定性,分析了風(fēng)力發(fā)電場風(fēng)力變化和電網(wǎng)短路故障兩種擾動下電網(wǎng)的暫態(tài)電壓穩(wěn)定性。并分析了動態(tài)無功補(bǔ)償裝置SVG安裝前后電網(wǎng)電壓暫態(tài)穩(wěn)定性的差異。在并網(wǎng)出現(xiàn)三相短路故障時(shí),安裝SVG之后的電壓跌落比之前的下降比例減少了10.06%,得出了在電網(wǎng)遭受短路故障時(shí)安裝動態(tài)無功補(bǔ)償裝置SVG會提高電網(wǎng)的暫態(tài)穩(wěn)定性。
[Abstract]:With the development of social science and technology, new generation technology is becoming more and more mature, especially the speed of wind power generation. Wind power also has high commercial value and environmental protection value, and its prospects are unlimited. However, wind power generation also has its shortcomings, the randomness and volatility of wind resources will have an impact on its controllability. Compared with the traditional power generation, wind power generation still has a lot of room for improvement. Wind power grid connection will cause voltage instability and other adverse effects, which is a hot research direction. The research object of this paper is a real power grid A, when the power grid A is connected to the wind farm, the change of voltage stability is studied, and the static voltage and transient voltage stability of the system are studied respectively. By establishing the model of power grid A in PSD-BPA program, the influence of wind farm access on the voltage stability of regional power network is studied. The specific work is as follows: (1) the double-fed wind turbine with capacity of 2MW is taken as the research object. The whole mathematical model of wind power system is constructed, including wind turbine model, doubly-fed wind turbine model, converter model and control system model. (2) static and dynamic mechanism of power system voltage instability is analyzed. Including the basis for judging voltage instability. The load margin is defined as the criterion of static voltage stability, and the influence of wind speed fluctuation and line fault on transient voltage stability is considered. (3) A system model is constructed and its static voltage stability is studied. The U-Q sensitivity of substation node voltage under different connection modes of wind farm is calculated, and the influence of different connection mode of wind farm on substation voltage is analyzed. This paper compares the two operation modes of installing fixed reactive power compensation equipment in power grid A and increasing the terminal voltage of wind turbine. (4) aiming at the transient voltage stability of power grid A, The transient voltage stability of the wind farm under the disturbance of wind power change and short circuit fault is analyzed. The difference of voltage transient stability before and after SVG installation of dynamic reactive power compensator is analyzed. When there is a three-phase short circuit fault in power grid, the voltage drop after installing SVG is 10.06 less than that before. It is concluded that the installation of dynamic reactive power compensator SVG will improve the transient stability of power network when the power network suffers short circuit fault.
【學(xué)位授予單位】：華北水利水電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM614

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本文編號：2188540