發(fā)布時間：2018-04-19 21:33

  本文選題：次同步振蕩 + 串聯(lián)補償�。� 參考：《西南交通大學》2017年碩士論文

【摘要】：風能的大規(guī)模應用是現(xiàn)代電力系統(tǒng)進步和發(fā)展的重要標志。如今,我國風電產(chǎn)業(yè)規(guī)模的迅速擴大,風電場并網(wǎng)問題愈來愈突出。為了解決我國風能賦存與負荷需求逆向分布的格局,電力系統(tǒng)采用了大量基于電力電子技術的靈活調(diào)控裝置,包括可以提高線路輸送能力和增強系統(tǒng)穩(wěn)定性的串聯(lián)補償設備。但雙饋風電場經(jīng)串聯(lián)補償設備并網(wǎng)會誘發(fā)系統(tǒng)次同步振蕩現(xiàn)象。因此,研究含雙饋風電場的電力系統(tǒng)次同步振蕩問題具有很強的工程實踐意義。本文首先從研究電力系統(tǒng)次同步振蕩基本理論出發(fā),分析了引起次同步振蕩的因素及作用機理。根據(jù)使用方法和分析結果側重點不同,討論了一些常用分析方法和行之有效的抑制策略。然后,建立了考慮風力機、雙饋感應發(fā)電機、變流器及帶串補輸電線路的改進IEEE第一標準模型,并進一步建立全系統(tǒng)狀態(tài)方程,給出了線性化的系統(tǒng)小信號模型。接著,根據(jù)小干擾穩(wěn)定性理論,基于系統(tǒng)狀態(tài)矩陣的各模態(tài)特征值,分析出影響系統(tǒng)次同步振蕩的主要因素為串聯(lián)補償度。接著,采用復轉矩系數(shù)分析法進一步分析了系統(tǒng)電氣阻尼的變化。最后,給出了基于STATCOM的次同步阻尼控制策略,并在DigSILENT/Power Factory進行仿真驗證。仿真結果表明,本文設計的控制策略能有效抑制計及雙饋風電機組電力系統(tǒng)次同步振蕩。
[Abstract]:The large-scale application of wind energy is an important symbol of the progress and development of modern power system. Nowadays, with the rapid expansion of wind power industry in China, the problem of wind farm grid connection is becoming more and more prominent. In order to solve the reverse distribution pattern of wind energy storage and load demand in China, a large number of flexible control devices based on power electronics technology are used in power system, including series compensation equipment which can improve transmission capacity and enhance system stability. But a doubly-fed wind farm connected to the grid by a series compensator will induce the sub-synchronous oscillation of the system. Therefore, the study of subsynchronous oscillation in power system with doubly-fed wind farm is of great practical significance. In this paper, the basic theory of subsynchronous oscillation in power system is studied, and the factors that cause subsynchronous oscillation and its mechanism are analyzed. Some common analytical methods and effective suppression strategies are discussed according to the different emphasis of using methods and analysis results. Then, the improved IEEE first standard model considering wind turbine, doubly-fed induction generator, converter and transmission line with series compensation is established, and the equation of state of the whole system is further established, and the linearized small signal model of the system is given. Then, according to the theory of small disturbance stability and based on the eigenvalues of the state matrix of the system, it is analyzed that the main factor affecting the sub-synchronous oscillation of the system is the series compensation degree. Then, the complex torque coefficient analysis method is used to further analyze the change of the electrical damping of the system. Finally, the sub-synchronous damping control strategy based on STATCOM is presented and simulated in DigSILENT/Power Factory. The simulation results show that the control strategy designed in this paper can effectively suppress the sub-synchronous oscillation in the power system of doubly-fed wind turbine.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM712

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