【摘要】：隨著我國千萬千瓦級大型風電基地逐步并網(wǎng),電力系統(tǒng)中風電滲透率急劇升高。然而,過高的風電滲透率不但使系統(tǒng)慣量減小,還可能會對系統(tǒng)阻尼特性產(chǎn)生不利影響,嚴重威脅到實際電力系統(tǒng)的安全穩(wěn)定運行。因此,研究大規(guī)模風電并網(wǎng)對系統(tǒng)功率振蕩和阻尼特性的影響是目前亟待解決的問題。當前大多數(shù)文獻中風電場并網(wǎng)特性研究采用自定義的風電機組模型,模型的有效性得不到保證,研究結果可信度降低;并且,傳統(tǒng)的研究方法大多只關注了風電場并網(wǎng)對系統(tǒng)中原有振蕩模式的影響,而較少研究風電場并網(wǎng)引入的功率振蕩模式。針對上述問題,本文采用特征值分析,結合時域仿真和prony分析法,對大規(guī)模風電場并網(wǎng)進行了以下研究:(1)詳細闡述了美國西部電力協(xié)調委員會(Western Electricity Coordinating Council,WECC)Ⅲ型和Ⅳ型風電機組通用動態(tài)模型的建模原則與模型結構,通過仿真驗證簡要對比了兩代模型的差異,指出了第二代通用動態(tài)模型的改進部分,闡明了應用第二代風電機組通用動態(tài)模型的必要性。(2)基于第二代Ⅲ型風電機組通用動態(tài)模型,結合小干擾特征值分析、時域仿真和prony分析,揭示了一個Ⅲ型風電機組/場并網(wǎng)會產(chǎn)生一對頻率較高的功率振蕩模式,通過參與因子驗證此振蕩模式與風電機組的控制變量強相關。隨著風電滲透率的提高,這種控制模式阻尼減小,最終驅動系統(tǒng)功率振蕩,導致系統(tǒng)小干擾失穩(wěn)。由此表明風電滲透率提高后,電力系統(tǒng)除了以往的功角穩(wěn)定性問題外,還可能會產(chǎn)生一種新的穩(wěn)定形態(tài),即風電機組控制模式穩(wěn)定性。(3)基于第二代Ⅳ型風電機組通用動態(tài)模型,研究發(fā)現(xiàn)一個Ⅳ型風電機組/場接入電網(wǎng),會引入1對與風電機組的功角和轉速相關的共�！帮L機機電振蕩模式”。這一新型的“風機機電振蕩模式”能通過變流器傳播到電網(wǎng),而且會在風電機組之間產(chǎn)生較強的相互作用,且只與Ⅳ型風電機組的功角和轉速強相關,而與變流器電氣控制弱相關。隨著風電滲透率的提高,“風機機電振蕩模式”的阻尼逐漸變弱而最終引起系統(tǒng)小干擾失穩(wěn)。
[Abstract]:With the grid connection of thousands of kilowatt wind power bases in China, the permeability of wind power in power system increases sharply. However, the excessive wind power permeability not only reduces the inertia of the system, but also may adversely affect the damping characteristics of the system, which seriously threatens the safe and stable operation of the actual power system. Therefore, it is an urgent problem to study the influence of large-scale wind power grid connection on the power oscillation and damping characteristics of the system. At present, the wind turbine model is used in the research of the grid-connected characteristics of stroke electric field in most literatures. The validity of the model is not guaranteed, and the reliability of the research results is reduced. Moreover, most of the traditional research methods only pay attention to the influence of grid-connected wind farm on the original oscillation modes in the system, but seldom study the power oscillation modes introduced by the grid-connected wind farms. In order to solve these problems, this paper uses eigenvalue analysis, time domain simulation and prony analysis to study the grid connection of large-scale wind farms as follows: (1) the (Western Electricity Coordinating Council, of the Western Power Coordination Committee of the United States is described in detail. The modeling principle and model structure of the general dynamic model of WECC) type 鈪，

本文編號：2431952