【摘要】：隨著社會的發(fā)展,能源與環(huán)境問題日益凸現(xiàn)出來,并制約著傳統(tǒng)大電網(wǎng)的發(fā)展。而在這樣的形勢下,對于新的、可再生能源的合理利用就顯得尤為重要,所以分布式發(fā)電這種供電形式越來越受到重視。分布式電源的優(yōu)勢不僅在于其可再生性以及環(huán)保效應(yīng),其產(chǎn)生的電能還可就地消耗,節(jié)省輸變電成本。但分布式電源本身的局限性,例如其波動性大、可控性差、單機(jī)接入成本高等,都制約著其發(fā)展。而微電網(wǎng)概念的提出,則很大程度上地解決了分布式電源接入電網(wǎng)中的種種問題,為分布式能源提供了更大的發(fā)展空間。本文所研究的直流微電網(wǎng),現(xiàn)階段對其研究較少,但由于其相對于傳統(tǒng)交流微電網(wǎng)在傳輸以及配電形式上的種種優(yōu)勢,相信一定會有很大的發(fā)展空間。本文基于 PSCAD(Power Systems Computer Aided Design)軟件,分析了風(fēng)力發(fā)電機(jī)和光伏電池的基本原理,并通過直流母線將兩種分布式電源與負(fù)荷以及交流大電網(wǎng)相聯(lián)接,構(gòu)成直流微電網(wǎng)模型。并以改善直流母線電壓穩(wěn)定性為目的,在直流微電網(wǎng)中應(yīng)用了相關(guān)的控制策略,對于并網(wǎng)模式下的直流微電網(wǎng)進(jìn)行仿真模擬分析,通過添加改變分布式電源出力以及負(fù)荷波動等擾動,來驗(yàn)證穩(wěn)壓控制策略對于整個(gè)系統(tǒng)的有效性。
[Abstract]:With the development of society, the problems of energy and environment come out day by day, and restrict the development of traditional power grid. In such a situation, the rational utilization of new and renewable energy is particularly important, so distributed generation is becoming more and more important. The advantages of distributed power generation lie not only in its reproducibility and environmental protection effects, but also in the local consumption of electricity generated by it and in saving the cost of transmission and transformation. However, the limitations of DG itself, such as its high volatility, poor controllability and high cost of single access, all restrict its development. However, the concept of microgrid has solved the problems of distributed power grid to a great extent and provided more space for the development of distributed energy. The DC microgrid studied in this paper is less studied at present, but due to its advantages over the traditional AC microgrid in transmission and distribution forms, it is believed that there will be a lot of room for development. Based on PSCAD (Power Systems Computer Aided Design) software, the basic principle of wind turbine and photovoltaic cell is analyzed in this paper. The DC microgrid model is constructed by connecting the two kinds of distributed generation with load and large AC power grid by DC bus. In order to improve the stability of DC bus voltage, the related control strategy is applied in DC microgrid, and the simulation analysis of DC microgrid in grid-connected mode is carried out. The stability control strategy is proved to be effective for the whole system by adding disturbance such as changing the output force and load fluctuation of the distributed power supply.
【學(xué)位授予單位】：沈陽工程學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM727;TM743

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