本文選題：含風(fēng)電電力系統(tǒng) + 暫態(tài)穩(wěn)定��； 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：近年來風(fēng)電并網(wǎng)容量越來越大,含風(fēng)電電力系統(tǒng)的暫態(tài)穩(wěn)定分析已成為亟待解決的課題。風(fēng)電機組多采用異步發(fā)電機,本身沒有功角,不存在常規(guī)的同步穩(wěn)定問題,實際中風(fēng)電機組和風(fēng)電場對電力系統(tǒng)暫態(tài)穩(wěn)定的影響通過常規(guī)機組得以體現(xiàn)。目前,含風(fēng)電電力系統(tǒng)的暫態(tài)穩(wěn)定研究多采用仿真方法,通過分析擾動過程中常規(guī)機組的功角變化和特定故障的極限切除時間來判定和研究。本文從含風(fēng)電電力系統(tǒng)暫態(tài)穩(wěn)定分析方法的建立、方法的完善和應(yīng)用分析等方面展開相關(guān)研究工作,主要工作概括如下： (1)建立雙饋風(fēng)電機組的模型,分析機組各控制模塊的數(shù)學(xué)方程和控制框圖,并利用集總參數(shù)建模方法,基于風(fēng)電場內(nèi)的功率損耗等效原則和容量加權(quán)法實現(xiàn)風(fēng)電場集電系統(tǒng)的化簡和等值模型參數(shù)的求取,實現(xiàn)雙饋型風(fēng)電場的建模。 (2)在假設(shè)系統(tǒng)失穩(wěn)為兩機失穩(wěn)的基礎(chǔ)上,考慮風(fēng)電場對系統(tǒng)影響最嚴重的情形,將風(fēng)電場的機械功率和電磁功率等值為系統(tǒng)等值機械功率的一部分,推導(dǎo)了計及風(fēng)電時系統(tǒng)的數(shù)學(xué)模型和功角特性,結(jié)合含風(fēng)電場擴大單機無窮大系統(tǒng)的分析,總結(jié)系統(tǒng)等值機械功率在暫態(tài)過程中的變化規(guī)律,并建立含風(fēng)電電力系統(tǒng)的擴展等面積分析法；以CIGRE B4-39系統(tǒng)為算例驗證使用所提方法定性分析含風(fēng)電電力系統(tǒng)暫態(tài)穩(wěn)定性的有效性。 (3)提出能夠評判機組控制參數(shù)對風(fēng)電機組暫態(tài)性能影響大小的靈敏度指標,進而確定影響風(fēng)電機組暫態(tài)特性的關(guān)鍵參數(shù),通過合理配置關(guān)鍵參數(shù)實現(xiàn)不同的風(fēng)電機組控制特性,并深入分析控制特性對系統(tǒng)等值機械功率的影響；進一步地,在機組控制特性相同的情況下,分析不同風(fēng)電出力對系統(tǒng)等值機械功率的影響；基于分析結(jié)果,獲取擾動過程中不同控制特性、不同風(fēng)電出力下系統(tǒng)等值機械功率曲線的變化規(guī)律,進一步完善計及風(fēng)電的擴展等面積分析法。
[Abstract]:In recent years, the wind power grid capacity is increasing, the transient stability analysis of wind power system has become an urgent task to be solved. Most wind turbine units adopt asynchronous generators without power angle, and there is no conventional synchronous stability problem. In practice, the influence of wind turbine and wind farm on the transient stability of power system can be reflected by conventional units. At present, the transient stability of wind power systems is studied by simulation method, which is determined and studied by analyzing the variation of power angle of conventional units and the limit time of specific faults in the process of disturbance. In this paper, the establishment of transient stability analysis method for wind power system, the improvement of the method and the application analysis are carried out. The main work is summarized as follows: 1) establishing the model of doubly-fed wind turbine, analyzing the mathematical equation and control block diagram of each control module of the unit, and using lumped parameter modeling method. Based on the equivalent principle of power loss in wind farm and the capacity weighting method, the simplification and equivalent model parameters of wind farm collector system are obtained, and the modeling of doubly-fed wind farm is realized. Based on the assumption that the instability of the system is two-machine instability and considering the most serious influence of wind farm on the system, the mechanical and electromagnetic power of the wind farm is equated as part of the equivalent mechanical power of the system. The mathematical model and power angle characteristics of the wind power system are derived. The variation of the equivalent mechanical power of the system in transient process is summarized by combining the analysis of the expanded single machine infinite bus system with wind farm. The extended iso-area analysis method for wind power system is established, and the effectiveness of the proposed method for qualitative analysis of transient stability of wind power system is verified by using CIGRE B4-39 system as an example. 3) the sensitivity index which can judge the influence of unit control parameters on the transient performance of wind turbine is put forward, and the key parameters that affect the transient characteristics of wind turbine are determined, and the different control characteristics of wind turbine are realized by reasonable configuration of key parameters. The influence of the control characteristics on the equivalent mechanical power of the system is deeply analyzed. Furthermore, the influence of different wind power output forces on the equivalent mechanical power of the system is analyzed under the condition of the same control characteristics of the unit, and based on the analysis results, The variation law of the equivalent mechanical power curve of the system under different wind power output forces and different control characteristics in the disturbance process is obtained, and the expansion iso-area analysis method taking into account wind power is further improved.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM614

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