本文選題：雙饋風電場 + 串聯(lián)補償　； 參考：《重慶大學》2014年碩士論文

【摘要】：隨著風電機組單機容量和風電場規(guī)模的增大，風電場與電力系統(tǒng)的相互作用和影響逐漸增強，特別是隨著風火打捆的輸送方式的實施以及遠距離、高串補度的點對網(wǎng)輸電系統(tǒng)的規(guī)劃，大容量風電場的并網(wǎng)運行可能存在加劇系統(tǒng)次同步振蕩事故的風險，為了探究風電場并網(wǎng)后系統(tǒng)次同步振蕩機理，提高大容量風電場并網(wǎng)安全穩(wěn)定運行能力，本文以并網(wǎng)雙饋風電場為例，研究含風電場的電力系統(tǒng)次同步振蕩特性及其抑制策略。 本文的研究內(nèi)容主要包括以下幾部分： ①根據(jù)推導的風力機傳動鏈、雙饋發(fā)電機、轉(zhuǎn)子側(cè)變頻器、以及同步發(fā)電機等小信號模型，建立含雙饋風電場的電力系統(tǒng)小信號穩(wěn)定性分析的詳細模型，并在DigSILENT/PowerFactory平臺上搭建各主要部件模型和控制系統(tǒng)，為進一步開展次同步振蕩特性研究奠定基礎(chǔ)。 ②為了研究風電場并網(wǎng)對汽輪發(fā)電機次同步振蕩影響，以IEEE第一標準測試為例，采用特征值分析方法，分析了含雙饋風電場的系統(tǒng)次同步振蕩模態(tài)，并通過時域仿真進行驗證。在此基礎(chǔ)上，研究雙饋風電場不同運行點、風電場參與調(diào)度的無功大小對系統(tǒng)次同步振蕩模態(tài)的影響規(guī)律。 ③為了提高大容量風電場參與系統(tǒng)次同步振蕩的抑制能力，提出雙饋風電場抑制系統(tǒng)次同步振蕩的機理分析。通過引入有功-轉(zhuǎn)速型和無功-轉(zhuǎn)速型傳遞函數(shù)，分別推導了雙饋風電場有功和無功功率對系統(tǒng)阻尼系數(shù)大小和性質(zhì)的表達式，并獲得其提供系統(tǒng)正阻尼的條件。 ④為了設(shè)計在全次同步頻段提供有效正阻尼的附加阻尼控制策略，，根據(jù)獲得的有功-轉(zhuǎn)速型和無功-轉(zhuǎn)速型傳遞函數(shù)的相角范圍，通過PID相位補償控制器的參數(shù)優(yōu)化，分別提出了雙饋風電場有功和無功功率附加阻尼控制策略，并與無抑制措施時的仿真效果進行對比。 上述研究成果對風電并網(wǎng)后電力系統(tǒng)次同步振蕩現(xiàn)象的分析和電力系統(tǒng)穩(wěn)定運行具有重要的參考價值，將為抑制含風電場的電力系統(tǒng)次同步振蕩策略研究奠定理論基礎(chǔ)和決策支持。
[Abstract]:With the increase of wind turbine capacity and wind farm scale, the interaction and influence between wind farm and power system is gradually enhanced, especially with the implementation of wind and fire bundles transportation and long distance. In order to explore the mechanism of sub-synchronous oscillation in wind farm, the planning of point-to-grid transmission system with high series-compensation degree and the connection operation of large capacity wind farm may increase the risk of sub-synchronous oscillation accident of the system, in order to explore the mechanism of sub-synchronous oscillation of the system after the wind farm is connected to the grid. In order to improve the safe and stable operation ability of large capacity wind farm, this paper studies the subsynchronous oscillation characteristics of power system with wind farm and its suppression strategy, taking the grid-connected doubly-fed wind farm as an example. The main research contents of this paper are as follows: 1 according to the small signal model of wind turbine transmission chain, doubly-fed generator, rotor side converter and synchronous generator, etc. The detailed model of small signal stability analysis of power system with doubly-fed wind farm is established, and the main components model and control system are built on the platform of DigSIL / PowerFactory. In order to study the influence of wind farm grid on the subsynchronous oscillation of turbogenerator, the method of eigenvalue analysis is used to test the first standard test of IEEE. The subsynchronous oscillation modes of the system with doubly-fed wind farm are analyzed and verified by time domain simulation. On this basis, the influence of reactive power of wind farm on the mode of sub-synchronous oscillation is studied. 3 in order to improve the suppression ability of large capacity wind farm to participate in the sub-synchronous oscillation of the system, the influence of reactive power of wind farm on the mode of sub-synchronous oscillation is studied. In this paper, the mechanism of suppressing the sub-synchronous oscillation in a doubly-fed wind farm is presented. By introducing the transfer function between active power and rotational speed and reactive power and rotating speed, the expressions of the damping coefficient and the property of the active power and reactive power on the system are derived, respectively. In order to design an additional damping control strategy to provide effective positive damping in the full synchronous frequency band, according to the phase angle range of the active power-rotational speed transfer function and the reactive power-rotational speed transfer function, Through the parameter optimization of pid phase compensation controller, an additional damping control strategy for active and reactive power of doubly-fed wind farm is proposed, and the simulation results are compared with the simulation results without restraining measures. The above research results have important reference value for the analysis of sub-synchronous oscillation phenomenon of power system after wind power grid connection and the stable operation of power system. It will lay a theoretical foundation and decision support for the study of subsynchronous oscillation strategy of power system with wind farm.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM614

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