本文關(guān)鍵詞： 微網(wǎng) 電能質(zhì)量 電壓暫降　出處：《華北電力大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：我國地大物博,但資源分布極不平衡,負(fù)荷分散在東部發(fā)達(dá)地區(qū),而能源卻集中于西部地區(qū)。采用特高壓、遠(yuǎn)距離輸電將電能輸送到負(fù)荷中心不失為一種高效而環(huán)保的方法,但可再生能源更多是以分布式發(fā)電的形式進(jìn)行開發(fā)利用。把不同互補的能源類型組建到一個共同的微電網(wǎng)之中,通過多種能源轉(zhuǎn)換裝置實現(xiàn)一次能源到二次能源的轉(zhuǎn)換,可以有效地提高一次能源的利用效率。同時,在微網(wǎng)中加入儲能裝置,可以更有效更合理地利用能源,平滑功率波動、確保電壓和頻率穩(wěn)定及維持發(fā)電和負(fù)荷的平衡。微網(wǎng)給我們生活帶來了諸多方便,但微網(wǎng)中包含大量的電力電子變換裝置,它們的使用對微網(wǎng)的電能質(zhì)量產(chǎn)生了更高的要求和新的影響。微網(wǎng)短時間的電壓降低就可能導(dǎo)致電力電子裝置的非正常工作,嚴(yán)重時引起微網(wǎng)的解列,用戶可能因此承受巨大的經(jīng)濟損失。因此對含微網(wǎng)的配電系統(tǒng)電壓暫降問題進(jìn)行研究,從而提高微網(wǎng)及配網(wǎng)的電能質(zhì)量水平,具有重要的意義。本文研究了微網(wǎng)的結(jié)構(gòu)、關(guān)鍵技術(shù)及主要微源和控制策略,在PSCAD軟件平臺上搭建了含微網(wǎng)的配電系統(tǒng)的仿真模型,在仿真平臺上對含微網(wǎng)的配電系統(tǒng)電壓暫降問題進(jìn)行機理分析,深入研究了微源與微網(wǎng)、微網(wǎng)與配網(wǎng)相互之間作用對電能質(zhì)量的影響。根據(jù)微網(wǎng)及微電源的特點,本文提出了一種適用于含微網(wǎng)的配電系統(tǒng)的動態(tài)電壓補償器,將光伏發(fā)電單元和蓄電池協(xié)調(diào)控制,為動態(tài)電壓補償器提供能源輸入。最后通過仿真驗證了上述動態(tài)電壓補償器對電壓暫降的補償效果。結(jié)果表明,以上動態(tài)電壓恢復(fù)器適用于含微網(wǎng)的配電系統(tǒng),在充分利用微源的情況下能夠保證微網(wǎng)正常運行,提高了含微網(wǎng)的配電系統(tǒng)的電能質(zhì)量水平。
[Abstract]:Our country is rich in resources, but the distribution of resources is very unbalanced, the load is scattered in the eastern developed area, but the energy is concentrated in the western region. It is an efficient and environmentally friendly method to transmit electric energy to the load center by using UHV and long-distance transmission. However, renewable energy is more developed and utilized in the form of distributed power generation. Different complementary energy types are formed into a common microgrid, and primary to secondary energy are converted through a variety of energy conversion devices. It can effectively improve the efficiency of primary energy utilization. At the same time, by adding energy storage device to the microgrid, energy can be used more effectively and reasonably, and the power fluctuation can be smoothed. Ensure voltage and frequency stability and maintain power generation and load balance. Microgrids bring us a lot of convenience in our lives, but microgrids contain a large number of power electronic conversion devices. Their use has higher requirements and new effects on the power quality of microgrids. A short period of voltage reduction in microgrids may lead to abnormal operation of power electronic devices and, in serious cases, to the de-listing of microgrids. Therefore, it is of great significance to study the voltage sag of distribution system with microgrid in order to improve the power quality level of microgrid and distribution network. Based on the key technology and main microsource and control strategy, the simulation model of distribution system with microgrid is built on PSCAD software platform, and the mechanism of voltage sag of distribution system with microgrid is analyzed on the simulation platform. The effect of the interaction between microsource and microgrid, micro-grid and distribution network on power quality is deeply studied. According to the characteristics of micro-grid and micro-power supply, a dynamic voltage compensator suitable for distribution system with microgrid is proposed in this paper. The photovoltaic unit and battery are coordinated to provide the energy input for the dynamic voltage compensator. Finally, the effect of the dynamic voltage compensator on voltage sag is verified by simulation. The above dynamic voltage restorer is suitable for the distribution system with microgrid. It can ensure the normal operation of the microgrid and improve the power quality level of the distribution system with microgrid under the condition of making full use of the microsource.
【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】：2015
【分類號】：TM714.2

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本文編號：1504008