【摘要】：風(fēng)電場(chǎng)大規(guī)模集中接入電網(wǎng)后,帶來了諸多不利影響,不僅容易出現(xiàn)電壓水平降低、電壓波動(dòng)以及頻率波動(dòng)的問題,還會(huì)帶來系統(tǒng)暫態(tài)穩(wěn)定性變差等嚴(yán)重問題,傳統(tǒng)的交流輸電方式并不能緩解風(fēng)電大規(guī)模接入電網(wǎng)引起的負(fù)面影響。柔性直流輸電方式基于具有自換向特性的電壓源換流器,并采用脈寬調(diào)制技術(shù),實(shí)現(xiàn)了有功無功的解耦,使得獨(dú)立連續(xù)的調(diào)節(jié)成為可能。柔性直流輸電技術(shù)憑借其多方面的優(yōu)勢(shì),為風(fēng)電大規(guī)模集中接入電網(wǎng)提拱了新的解決途徑和技術(shù)方案,因此研究風(fēng)電場(chǎng)通過柔性直流方式接入電網(wǎng)具有重要意義。本文針對(duì)柔性直流輸電在風(fēng)電接入電網(wǎng)中的應(yīng)用進(jìn)行了研究,首先總結(jié)了各國的風(fēng)電并網(wǎng)導(dǎo)則,闡述了我國大規(guī)模風(fēng)電集中接入的可能,接下來對(duì)較為成熟的雙饋風(fēng)力發(fā)電機(jī)組數(shù)學(xué)模型和柔性直流輸電數(shù)學(xué)模型進(jìn)行了坐標(biāo)變換,將模型予以簡化,之后提出了適用于風(fēng)電場(chǎng)接入的柔性直流控制策略,最后利用PSS/E仿真工具對(duì)遼寧某地區(qū)孤立電網(wǎng)進(jìn)行仿真實(shí)驗(yàn),驗(yàn)證了柔性直流輸電在動(dòng)態(tài)補(bǔ)償系統(tǒng)缺失無功、維持系統(tǒng)電壓穩(wěn)定以及抑制系統(tǒng)頻率波動(dòng)等方面的有利作用,為柔性直流輸電技術(shù)應(yīng)用在風(fēng)電接入電網(wǎng)提供了有益的參考價(jià)值。
[Abstract]:After the wind farm is connected to the power network on a large scale, it brings a lot of adverse effects. It is not only easy to reduce the voltage level, voltage fluctuation and frequency fluctuation, but also bring serious problems such as the deterioration of the transient stability of the system. The traditional AC transmission method can not alleviate the negative impact caused by large-scale wind power grid access. The flexible DC transmission mode is based on the voltage source converter with the characteristic of self-commutation and adopts the pulse width modulation technology to realize the decoupling of active and reactive power which makes it possible to adjust independently and continuously. Flexible DC transmission technology, with its advantages in many aspects, provides a new solution and technical scheme for large-scale centralized wind power grid access, so it is of great significance to study wind farm access to power grid through flexible DC mode. In this paper, the application of flexible direct current transmission in wind power grid is studied. Firstly, the guide of wind power connection in various countries is summarized, and the possibility of large-scale wind power centralized access in China is discussed. Then coordinate transformation is carried out on the more mature mathematical model of doubly-fed wind turbine and flexible direct current transmission, and the model is simplified, and then a flexible DC control strategy suitable for wind farm access is proposed. Finally, the simulation experiment of isolated power grid in a certain area of Liaoning province is carried out by using PSS/E simulation tool, which verifies the advantages of flexible direct current transmission in dynamic compensation system for missing reactive power, maintaining system voltage stability and restraining system frequency fluctuation. It provides a useful reference for the application of flexible direct current transmission technology in wind power grid.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM614

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