【摘要】：當(dāng)今世界的能源結(jié)構(gòu)正在發(fā)生轉(zhuǎn)變,可以預(yù)見,在電力系統(tǒng)未來數(shù)十年的發(fā)展中,可再生能源將逐步取代傳統(tǒng)化石能源成為電力供給的主要來源。在這個(gè)過程中,如何實(shí)現(xiàn)可再生能源的大規(guī)模并網(wǎng),提高地區(qū)電網(wǎng)對(duì)可再生能源的消納能力是世界能源發(fā)展所要面臨的難題。隨著柔性直流輸電的快速發(fā)展,以此技術(shù)為基礎(chǔ)構(gòu)建的直流電網(wǎng)將有效解決上述問題。本文對(duì)含大規(guī)模風(fēng)電的柔性直流電網(wǎng)的啟動(dòng)過程進(jìn)行了研究,首先考慮了單個(gè)換流站的充電過程,分別對(duì)有源換流站經(jīng)交流側(cè)和無源換流站經(jīng)直流側(cè)進(jìn)行預(yù)充電的原理進(jìn)行了分析;然后對(duì)風(fēng)電場(chǎng)經(jīng)柔性直流輸電接入電網(wǎng)的技術(shù)進(jìn)行了研究,分別設(shè)計(jì)實(shí)現(xiàn)了風(fēng)場(chǎng)側(cè)換流站的無源逆變控制策略和風(fēng)電并網(wǎng)控制策略;最后,以張北柔性直流電網(wǎng)示范工程為背景,討論了多個(gè)換流站經(jīng)架空線及高壓直流斷路器完成組網(wǎng)后整個(gè)系統(tǒng)的協(xié)調(diào)啟動(dòng)控制策略,分別對(duì)常規(guī)情況及幾種典型運(yùn)行方式切換下的直流電網(wǎng)啟動(dòng)流程進(jìn)行了設(shè)計(jì)。以上研究工作在進(jìn)行過程中均在PSCAD/EMTDC中搭建了相應(yīng)的仿真模型,對(duì)理論分析的正確性及控制策略的有效性進(jìn)行了驗(yàn)證。
[Abstract]:Nowadays, the energy structure of the world is changing. It can be predicted that renewable energy will gradually replace the traditional fossil energy as the main source of power supply in the future decades of power system development. In this process, how to realize the large-scale grid connection of renewable energy and improve the capacity of regional power grid to absorb renewable energy is a difficult problem for the development of energy resources in the world. With the rapid development of flexible DC transmission, the DC network based on this technology will solve these problems effectively. In this paper, the start-up process of flexible DC network with large-scale wind power is studied. Firstly, the charging process of a single converter station is considered. The principle of precharging of active converter station via AC side and passive converter station via DC side is analyzed respectively. Then, the technology of connecting wind farm to grid through flexible direct current transmission is studied, and the passive inverter control strategy of wind field side converter station and the control strategy of wind power grid connection are designed and realized respectively. Finally, taking the demonstration project of Zhangbei flexible DC network as the background, the coordinated startup control strategy of the whole system after several converter stations have completed the networking through overhead lines and HVDC circuit breakers is discussed. The starting process of DC network under normal operation and several typical operation modes is designed. In the process of the above research, the corresponding simulation models are built in PSCAD/EMTDC, and the correctness of the theoretical analysis and the effectiveness of the control strategy are verified.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM721.1

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