【摘要】：隨著化石能源枯竭與環(huán)境惡化,新能源成為了人類可持續(xù)發(fā)展的唯一出路。風(fēng)力發(fā)電作為較成熟的新能源開發(fā)與利用技術(shù),得到了迅速的發(fā)展與推廣,風(fēng)電并網(wǎng)容量呈現(xiàn)快速增長趨勢。但是由于風(fēng)力發(fā)電具有極大的不確定性與波動性,隨著風(fēng)電并網(wǎng)容量的增加,風(fēng)電功率波動對電網(wǎng)頻率的影響愈加明顯。為了提高大規(guī)模風(fēng)電并網(wǎng)電力系統(tǒng)的頻率穩(wěn)定性,本文深入分析了風(fēng)電功率對電網(wǎng)頻率的影響特性,提出了一種對風(fēng)電功率引起電網(wǎng)頻率最大偏移值的評估方法。首先,在不考慮發(fā)電機出力邊界等非線性因素的前提下,建立考慮風(fēng)電接入的線性系統(tǒng)頻率響應(yīng)模型,從而得到風(fēng)電功率波動引起電網(wǎng)頻率最大偏移值的計算公式。接著,考慮發(fā)電機出力邊界對電網(wǎng)調(diào)頻的影響,提出一種能夠考慮發(fā)電機出力邊界的頻率最大偏移值評估方法。并利用DIgSILENT/PowerFactory驗證了評估方法的有效性與準確性。在考慮風(fēng)電接入的電力系統(tǒng)頻率響應(yīng)模型的仿真中,本文發(fā)現(xiàn)了高頻風(fēng)電功率下傳統(tǒng)機組調(diào)速系統(tǒng)的調(diào)頻失效現(xiàn)象,調(diào)頻失效現(xiàn)象的出現(xiàn)原因是調(diào)速器與原動機物理執(zhí)行機構(gòu)存在反應(yīng)滯后特性,并通過DIgSILENT仿真證明了調(diào)頻失效現(xiàn)象的存在。傳統(tǒng)機組調(diào)速系統(tǒng)的調(diào)頻失效現(xiàn)象揭示了如何有效地抑制風(fēng)電功率波動必然是未來大規(guī)模風(fēng)電并網(wǎng)電力系統(tǒng)的研究課題之一。
[Abstract]:With the depletion of fossil energy and environmental deterioration, new energy has become the only way out for human sustainable development. Wind power generation as a mature new energy development and utilization technology, has been rapid development and promotion, wind power grid capacity presents a rapid growth trend. However, due to the great uncertainty and volatility of wind power generation, with the increase of wind power grid capacity, the influence of wind power fluctuation on power grid frequency becomes more and more obvious. In order to improve the frequency stability of large-scale wind power grid connected power system, this paper deeply analyzes the influence of wind power on power network frequency, and puts forward a method to evaluate the maximum frequency offset caused by wind power. Firstly, without considering the nonlinear factors such as generator output boundary, the frequency response model of linear system considering wind power access is established, and the calculation formula of the maximum frequency offset caused by wind power fluctuation is obtained. Then, considering the influence of generator output boundary on power grid frequency modulation, a method for evaluating the maximum frequency offset is proposed, which can take account of generator output boundary. The validity and accuracy of the evaluation method are verified by DIgSILENT/PowerFactory. In the simulation of the frequency response model of power system considering wind power access, the frequency modulation failure phenomenon of the traditional speed regulation system is found under the high frequency wind power. The reason of frequency modulation failure is that the governor and the physical actuator of the prime mover have the characteristic of reaction lag, and the phenomenon of frequency modulation failure is proved by DIgSILENT simulation. The failure of frequency modulation in the traditional speed regulation system reveals that how to effectively suppress the fluctuation of wind power is one of the research topics of large-scale wind power grid power system in the future.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM614;TM712

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