【摘要】：可再生能源的大規(guī)模開發(fā)與利用是緩解當今世界化石能源危機,減少環(huán)境污染的重要途徑。風能作為一種具有商業(yè)開發(fā)潛力的清潔能源,目前在電力系統(tǒng)中所占比重近年來呈現(xiàn)逐步增長的趨勢。未來電網(wǎng)中傳統(tǒng)以火電為主的同步發(fā)電機組將會被風電機組所取代,其電網(wǎng)將是高風電滲透率電網(wǎng)。由于風電機組輸出功率具有隨機性與波動性,當系統(tǒng)中風電滲透率增加時,風功率波動對于系統(tǒng)頻率穩(wěn)定性的影響不容忽視,研究高風電滲透率系統(tǒng)中風功率波動對系統(tǒng)頻率的影響程度,可總結(jié)出復雜電力系統(tǒng)的頻率響應機理。在工程中為系統(tǒng)風功率波動的平抑工作提供相應的數(shù)據(jù)支持,對保證未來高風電滲透率的電力系統(tǒng)安全穩(wěn)定運行具有重要意義。風功率波動不同于傳統(tǒng)的階躍式功率擾動,其對于系統(tǒng)頻率特性的影響不僅取決于功率波動的幅值,也與功率波動的頻率有關(guān),相同的功率波動幅值下,不同頻率的功率波動對于系統(tǒng)頻率特性的影響程度存在差異,當功率波動頻率處于系統(tǒng)固有頻率附近時,系統(tǒng)頻率響應較為劇烈,本文即從系統(tǒng)“敏感頻段”的角度,研究風功率波動對于系統(tǒng)頻率特性的影響。本文首先通過分析在發(fā)生功率不平衡擾動下系統(tǒng)頻率的響應機理,提出了電力系統(tǒng)“敏感頻段”的概念,研究了在系統(tǒng)風電滲透率增高的背景下“敏感頻段”的變化趨勢。針對復雜電力系統(tǒng),提出了考慮電力系統(tǒng)非線性特性的敏感頻段識別方法,并從電力系統(tǒng)“敏感頻段”角度,結(jié)合風功率波動的實測數(shù)據(jù)評估了風功率波動對系統(tǒng)頻率特性的影響程度。提出了基于敏感頻段的風電接納能力預測方法。最后用實際大電網(wǎng)算例,驗證了上述所提出方法的有效性。相比于其他電力系統(tǒng)頻率特性受風功率波動的影響程度研究方法,本文通過分析風功率波動中敏感風功率波動分量對電力系統(tǒng)頻率特性的影響來評估風功率波動對系統(tǒng)頻率的影響程度,本研究工作識別了復雜電力系統(tǒng)敏感頻段的范圍,可以通過評估系統(tǒng)抗敏感功率擾動的能力來限制風電機組的接納規(guī)模,并為風功率波動的平抑工作提供數(shù)據(jù)支持,維護了電力系統(tǒng)頻率的穩(wěn)定。
[Abstract]:Wind energy, as a kind of clean energy with commercial development potential, has a growing trend in the power system in recent years. In the future, the traditional thermal power generation synchronous generator will be replaced by wind turbine, and its power network will be high wind power permeability network. Because the output power of wind turbine is random and fluctuating, the influence of wind power fluctuation on the frequency stability of the system can not be ignored when the wind power permeability increases in the system. The frequency response mechanism of complex power system can be summarized by studying the influence of apoplectic power fluctuation on the frequency of high wind power permeability system. It is of great significance to ensure the safe and stable operation of the power system with high wind power permeability in the future by providing the corresponding data support for the stabilization of the wind power fluctuation of the system in the engineering. The wind power fluctuation is different from the traditional step power disturbance. Its influence on the frequency characteristics of the system depends not only on the amplitude of the power fluctuation, but also on the frequency of the power fluctuation. The influence of power fluctuation of different frequencies on the frequency characteristics of the system is different. When the power fluctuation frequency is near the natural frequency of the system, the frequency response of the system is more intense. In this paper, from the point of view of the "sensitive frequency band" of the system, The influence of wind power fluctuation on the frequency characteristics of the system is studied. In this paper, by analyzing the response mechanism of the system frequency under the disturbance of power imbalance, the concept of "sensitive frequency band" in power system is proposed, and the change trend of "sensitive frequency band" under the background of high wind power permeability is studied. For complex power system, a method of identifying sensitive frequency band considering nonlinear characteristics of power system is proposed, and from the point of view of "sensitive frequency band" of power system, The influence of wind power fluctuation on the frequency characteristics of the system is evaluated with the measured data of wind power fluctuation. A method of wind power acceptance prediction based on sensitive frequency band is proposed. Finally, the effectiveness of the proposed method is verified by a practical example of large power grid. Compared with other power system frequency characteristics, the influence of wind power fluctuation on frequency characteristics is studied. In this paper, the influence of wind power fluctuation on the frequency of power system is evaluated by analyzing the influence of the sensitive wind power fluctuation component on the frequency characteristics of power system, and the range of the sensitive frequency band of complex power system is identified. By evaluating the ability of the system to resist the sensitive power disturbance, the acceptance scale of wind turbine can be limited, and the stability of power system frequency can be maintained by providing data support for the stabilization of wind power fluctuation.
【學位授予單位】：東北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM614;TM712

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