發(fā)布時(shí)間：2019-03-19 12:35

【摘要】：隨著世界各國對能源安全、生態(tài)環(huán)境、氣候變化等問題日益重視,加快風(fēng)電等可再生能源的發(fā)展已成為國際社會(huì)為推動(dòng)能源轉(zhuǎn)型、應(yīng)對氣候變暖的普遍共識(shí)和一致行動(dòng)。但由于風(fēng)電等可再生資源的波動(dòng)性、隨機(jī)性、地域發(fā)展不平衡等特點(diǎn),導(dǎo)致消納問題日漸嚴(yán)重。基于電壓源換流器和全控性器件的柔性直流輸電具有功率靈活可控、電能質(zhì)量好、無換相失敗等優(yōu)勢,逐漸成為了解決風(fēng)電特別是海上風(fēng)電接入的最有效的方式。不僅如此,柔性直流輸電技術(shù)在弱電網(wǎng)供電、城市擴(kuò)容以及電力市場方面均發(fā)揮著無可替代的優(yōu)勢,已然成為了我國智能電網(wǎng)建設(shè)的重要環(huán)節(jié)。本文主要對柔性直流輸電系統(tǒng)的控制策略進(jìn)行了研究。首先,分析了柔性直流輸電技術(shù)運(yùn)行原理以及具有快速電流響應(yīng)特性和有功、無功功率解耦控制等優(yōu)點(diǎn)的電壓外環(huán)和電流內(nèi)環(huán)的雙環(huán)控制策略;然后,對柔性直流輸電系統(tǒng)主從控制、電壓裕度控制和直流電壓下垂控制的控制原理及特點(diǎn)進(jìn)行詳細(xì)的介紹,并在此基礎(chǔ)上,提出了一種協(xié)調(diào)控制策略,該策略綜合三種控制方式分層協(xié)調(diào)各換流站,能夠適應(yīng)較大范圍的不平衡功率,避免換流站過載的現(xiàn)象;之后,研究了風(fēng)電并網(wǎng)的控制策略,受端換流站采用適合潮流頻繁變動(dòng)的直流電壓下垂控制方式,可以實(shí)現(xiàn)功率的連續(xù)控制,但直流電壓會(huì)產(chǎn)生明顯的偏差,為了改善此問題,提出了一種改進(jìn)的直流電壓下垂控制策略,該策略在直流電壓參考值的基礎(chǔ)上疊加了一補(bǔ)償項(xiàng),抵消了直流電壓因功率變化導(dǎo)致的電壓偏差,從而實(shí)現(xiàn)了直流電壓的無差調(diào)節(jié);最后,在Matlab/simulink平臺(tái)上構(gòu)建了多端柔性直流輸電模型,分別仿真驗(yàn)證了所提控制策略的有效性。
[Abstract]:With the increasing attention to energy security, ecological environment, climate change and other issues in the world, accelerating the development of renewable energy such as wind power has become the universal consensus and concerted action of the international community in order to promote the transformation of energy and deal with climate warming. However, due to the volatility, randomness and unbalanced regional development of wind power and other renewable resources, the problem of consumption is becoming more and more serious. Flexible DC transmission based on voltage source converter and fully controlled devices has the advantages of flexible power control, good power quality and no commutation failure, which has become the most effective way to solve the problem of wind power, especially offshore wind power access. In addition, flexible DC transmission technology plays an irreplaceable advantage in weak grid power supply, urban expansion and power market, and has become an important link in the construction of smart grid in China. In this paper, the control strategy of flexible HVDC transmission system is studied. Firstly, the operation principle of flexible DC transmission technology and the double-loop control strategy of voltage outer loop and current inner loop with the advantages of fast current response, active power decoupling control and reactive power decoupling control are analyzed. Then, the control principles and characteristics of master-slave control, voltage margin control and DC voltage droop control of flexible HVDC transmission system are introduced in detail, and on this basis, a coordinated control strategy is proposed. The strategy integrates three control modes to coordinate each converter station and can adapt to a wide range of unbalanced power and avoid the phenomenon of overload of converter station. After that, the control strategy of wind power grid connection is studied. In order to improve this problem, the terminal converter station adopts the DC voltage droop control mode which is suitable for frequent change of power flow, which can realize the continuous control of power, but the DC voltage will produce obvious deviation. In this paper, an improved DC voltage droop control strategy is proposed. Based on the DC voltage reference value, a compensation term is added, which offsets the voltage deviation caused by the change of DC voltage, and thus realizes the no-difference regulation of DC voltage. Finally, a multi-terminal flexible HVDC transmission model is constructed on the Matlab/simulink platform, and the effectiveness of the proposed control strategy is verified by simulation.
【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】：2017
【分類號(hào)】：TM721.1

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本文編號(hào)：2443525