本文關(guān)鍵詞： 雙饋風機 風電滲透率 風電場等值 靜態(tài)電壓穩(wěn)定 暫態(tài)電壓穩(wěn)定　出處：《華北電力大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著環(huán)境污染問題的日益嚴重及傳統(tǒng)化石能源的逐漸枯竭,以風電為代表的新能源并網(wǎng)技術(shù)在世界各國迅速發(fā)展。隨著風電滲透率的逐漸增大,風電的出力對電網(wǎng)的影響范圍也相應增大。在風電滲透率較大的電網(wǎng)中,風電的并網(wǎng)改變了系統(tǒng)潮流的分布,影響了傳輸線路上的功率以及系統(tǒng)的慣量,同時由于風電的特殊性,風機特性使得電力系統(tǒng)原有的電壓穩(wěn)定性發(fā)生變化。 本文主要研究風電滲透率的不斷增加的電網(wǎng)的電壓穩(wěn)定性,主要內(nèi)容包括： 1、推導了雙饋異步風力發(fā)電機的穩(wěn)態(tài)模型及動態(tài)模型,從理論上了解風機在靜態(tài)與動態(tài)方面的特性。介紹了以風速為依據(jù),基于K-means聚類算法的分群方法：穩(wěn)態(tài)時只需要得出一個平均風速,即等值為一臺機；而暫態(tài)情況下得到多個等值機并通過與詳細風場的電壓、功率等外特性的仿真對比,證明利用K-means方法等值后的風電場準確率較高。 2、用P-V、U-Q曲線的靜態(tài)電壓穩(wěn)定分析方法,由于傳統(tǒng)的P-V曲線是不能體現(xiàn)風電的波動性,通過計算了不同風電滲透率與2015年海南電網(wǎng)的靜態(tài)電壓穩(wěn)定極限的關(guān)系,建立三維的P-V曲面構(gòu)成的電壓安全運行域來表征含風電系統(tǒng)的安全裕度,并利用這種方法確定該系統(tǒng)允許的最大接入容量；利用靈敏度分析指標,針對強、弱系統(tǒng),考慮不同運行方式下分析風電滲透不斷增加對系統(tǒng)電壓穩(wěn)定性的影響。 3、時域仿真是研究電壓穩(wěn)定問題的有效方法。推導了雙饋風機對暫態(tài)電壓的支撐作用,并在單機無窮大網(wǎng)絡(luò)上證明分析了雙饋風機對系統(tǒng)暫態(tài)電壓的影響。通過在海南2015年運行網(wǎng)架上接入等值風電場,仿真分析改變風電滲透率對該系統(tǒng)暫態(tài)電壓穩(wěn)定的影響,結(jié)合風機機端電壓表達式研究了風電滲透率、接地電阻、短路點位置,接入形式等因素對系統(tǒng)暫態(tài)電壓的影響。
[Abstract]:With the increasingly serious problem of environmental pollution and the gradual depletion of traditional fossil energy, the new energy grid technology, represented by wind power, is developing rapidly all over the world. The influence of wind power on the power grid is also increased. In the power grid with high wind power permeability, the distribution of power flow is changed, and the power on transmission lines and the inertia of the system are affected. At the same time, because of the particularity of wind power, the characteristics of fan make the original voltage stability of power system change. This paper mainly studies the voltage stability of the grid with increasing wind power permeability. The main contents are as follows:. 1. The steady state model and dynamic model of doubly-fed asynchronous wind turbine are derived, the characteristics of fan in static and dynamic aspects are theoretically understood, and the basis of wind speed is introduced. The clustering method based on K-means clustering algorithm: only one average wind speed is obtained in steady state, that is, the equivalent is one machine, while under transient conditions, multiple equal-duty machines are obtained and compared with the voltage and power characteristics of detailed wind field. It is proved that the accuracy of wind farm with K-means method is higher. 2. By using the static voltage stability analysis method of P-V U-Q curve, because the traditional P-V curve can not reflect the fluctuation of wind power, the relationship between the different wind power permeability and the static voltage stability limit of Hainan power network in 2015 is calculated. A three dimensional P-V surface voltage safe operation region is established to represent the safety margin of the wind power system, and the maximum allowable access capacity of the system is determined by this method, and the sensitivity analysis index is used for the strong and weak systems. Considering the different operation modes, the influence of increasing wind power penetration on the voltage stability of the system is analyzed. 3. Time domain simulation is an effective method to study voltage stability, and the supporting effect of doubly-fed fan on transient voltage is deduced. The influence of doubly-fed fan on the transient voltage of the system is proved and analyzed on the single-machine infinite bus network. The influence of changing the wind power permeability on the transient voltage stability of the system is simulated by connecting the equivalent wind farm to the grid in Hainan on 2015. Based on the expressions of wind turbine terminal voltage, the influence of wind power permeability, grounding resistance, short circuit location and access form on the transient voltage of the system is studied.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM614

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