本文關(guān)鍵詞：雙饋感應(yīng)風(fēng)電機組參與系統(tǒng)調(diào)頻的控制策略研究　出處：《華北電力大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 風(fēng)力發(fā)電 雙饋感應(yīng)風(fēng)電機組(DFIG) 頻率調(diào)節(jié) 慣性響應(yīng)控制 一次頻率控制

【摘要】：風(fēng)力發(fā)電作為綠色可再生能源近年來在我國快速發(fā)展，風(fēng)電在電網(wǎng)中的比例也不斷提高，使風(fēng)電場像常規(guī)電廠一樣承擔(dān)電網(wǎng)的調(diào)頻任務(wù)成為了新要求。在各個風(fēng)電場中，雙饋感應(yīng)風(fēng)電機組因變速運行且控制特性靈活，已成為主流機型。本文就雙饋風(fēng)電機組參與系統(tǒng)頻率調(diào)節(jié)的問題進行研究，并取得了以下成果： （1）建立了風(fēng)力機和雙饋電機的數(shù)學(xué)模型，研究了該機組的工作原理和功率流動關(guān)系，提出了轉(zhuǎn)子側(cè)變流器與網(wǎng)側(cè)變流器的矢量定向控制策略，并分析了雙饋機組的最大功率追蹤過程，為機組頻率策略的研究提供了理論基礎(chǔ)。 （2）在雙饋機組變速運行以追蹤最大功率的模式下，研究了雙饋風(fēng)電機組對系統(tǒng)頻率變化的響應(yīng)特性；闡述了大規(guī)模風(fēng)電并網(wǎng)對系統(tǒng)整體轉(zhuǎn)動慣量和其一次調(diào)頻能力的影響，以及風(fēng)電滲透率不斷提高后系統(tǒng)頻率的波動結(jié)果。為了雙饋機組頻率策略的研究，還介紹了同步機組的慣性響應(yīng)和一次調(diào)頻過程。 （3）分析了系統(tǒng)頻率波動時雙饋機組的功率控制能力，給出了風(fēng)電機組輸出功率隨轉(zhuǎn)子轉(zhuǎn)速變化的規(guī)律，從而表明雙饋風(fēng)電機組具有參與系統(tǒng)頻率調(diào)節(jié)的潛在能力。此外，還針對風(fēng)力機轉(zhuǎn)速的不同響應(yīng)程度提出了變速風(fēng)電機組虛擬轉(zhuǎn)動慣量的概念，并推導(dǎo)出了其具體的數(shù)學(xué)表達式。 （4）基于雙饋機組的功率追蹤過程，提出了雙饋風(fēng)電機組的兩種頻率響應(yīng)策略。通過雙饋機組功率追蹤曲線的切換，，實現(xiàn)了雙饋風(fēng)機的慣性響應(yīng)控制；通過雙饋機組載荷度的變化，實現(xiàn)了雙饋風(fēng)機的一次頻率控制，并闡述了兩種頻率控制策略的具體方式和詳細過程。 （5）在Matlab/Simulink仿真軟件中建立了電力系統(tǒng)的仿真模型，對本文所述的雙饋機組頻率控制策略進行了仿真分析，結(jié)果表明雙饋機組具有良好的頻率響應(yīng)特性，與同步發(fā)電機組一樣可對系統(tǒng)頻率提供動態(tài)支持，即驗證了本文所提控制方案的有效性。
[Abstract]:Wind power, as a green renewable energy, has been developing rapidly in China in recent years, and the proportion of wind power in power grid is also increasing. It is a new requirement for wind farms to take on the frequency modulation tasks of power grid like conventional power plants. In each wind farm, the doubly-fed induction wind turbines operate flexibly because of the variable speed and the control characteristics are flexible. In this paper, the problem of doubly-fed wind turbine participating in the frequency regulation of the system has been studied, and the following results have been achieved: 1) the mathematical models of wind turbine and doubly-fed generator are established, the working principle and power flow relationship of the unit are studied, and the vector oriented control strategy of rotor side converter and grid side converter is proposed. The maximum power tracking process of doubly-fed generator is analyzed, which provides a theoretical basis for the research of frequency strategy. 2) the response characteristics of doubly-fed wind turbine to the frequency change of the system are studied in the mode of variable speed operation of doubly-fed unit to track the maximum power. The influence of large-scale wind power grid connection on the overall rotational inertia and its primary frequency modulation ability of the system, as well as the frequency fluctuation results of the system after the increase of wind power permeability, are described in order to study the frequency strategy of doubly-fed generating units. The inertial response and the primary frequency modulation process of the synchronous unit are also introduced. The power control ability of the doubly-fed generator is analyzed when the frequency of the system is fluctuating, and the variation of the output power of the wind turbine with the rotor speed is given. It shows that the doubly-fed wind turbine has the potential ability to participate in the frequency regulation of the system. In addition, the concept of virtual moment of inertia of the variable speed wind turbine is put forward according to the different response degree of the speed of the wind turbine. The mathematical expressions are derived. Based on the power tracing process of doubly-fed wind turbine, two frequency response strategies of doubly-fed wind turbine are proposed. The inertial response control of doubly-fed fan is realized by switching the power tracing curve of doubly-fed wind turbine. The primary frequency control of the doubly-fed fan is realized by changing the load degree of the doubly-fed fan. The specific ways and the detailed process of the two kinds of frequency control strategies are described. 5) the simulation model of power system is established in the Matlab/Simulink simulation software, and the frequency control strategy of doubly-fed generator is simulated and analyzed. The results show that the doubly-fed generator unit has good frequency response characteristics and can provide dynamic support to the system frequency just as the synchronous generator set does. That is to say, the effectiveness of the control scheme proposed in this paper is verified.
【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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