本文選題：微電網(wǎng) + 孤島/并網(wǎng)運行　； 參考：《山西大學》2014年碩士論文

【摘要】：能源危機和環(huán)保問題已經(jīng)成為制約社會發(fā)展的主要因素之一,再加上傳統(tǒng)大規(guī)模電力系統(tǒng)日漸顯現(xiàn)出來的結構老化、能源利用效率較低等弊端,使得人們不得不思考對可再生能源的利用。由于具有環(huán)保、節(jié)能、經(jīng)濟等優(yōu)勢,分布式發(fā)電受到各界的廣泛關注,微電網(wǎng)是高效利用分布式能源的有效形式,近幾年來成為電力工業(yè)界廣大科技工作者研究的熱點之一。微電網(wǎng)的任務是為用戶提供清潔、可靠、優(yōu)質(zhì)的電力服務。將微電網(wǎng)與大電網(wǎng)并列運行,不但能夠節(jié)省投資、提高電能質(zhì)量,還可以保證電力系統(tǒng)的穩(wěn)定性和靈活性。微電網(wǎng)有孤島運行和并網(wǎng)運行兩種模式,在這兩種模式切換的過程中,由于硬件電路和軟件程序所用時間的不同,造成在過渡過程中并網(wǎng)逆變控制器的控制方式切換和運行模式切換的不同時性,最終導致并網(wǎng)電流和負載電壓出現(xiàn)沖擊,無法達到無縫切換。本文首先論述了太陽能光伏發(fā)電、風力發(fā)電、微型燃氣輪機、蓄電池的發(fā)電原理,并建立了相應的數(shù)學模型；論述了上述微電源逆變器的工作原理,建立了它們的數(shù)學模型。其次,在論述了太陽能光伏發(fā)電、風力發(fā)電、微型燃氣輪機及蓄電池逆變器控制原理的基礎上,給出PQ控制器、V/f控制及加權電壓、電流控制策略,搭建了微電源及控制的仿真模型,驗證了控制策略的有效性及可行性。最后,利用電磁暫態(tài)軟件PSCAD/EMTDC建立了整個微電網(wǎng)及控制模型,對微電網(wǎng)雙運行模式的切換進行仿真。由于微電網(wǎng)雙運行模式在切換過程中存在的問題,本文提出了加權控制算法。在逆變控制器雙環(huán)控制的基礎上,通過改變加權因子的值,并網(wǎng)過渡過程中加入電壓加權控制,離網(wǎng)過渡過程中加入電流加權控制。在改變控制策略后,能夠抑制并網(wǎng)電流的沖擊,穩(wěn)定負載電壓,最終達到微電網(wǎng)雙運行模式的無縫切換。
[Abstract]:The energy crisis and environmental protection problems have become one of the main factors restricting the development of the society. In addition, the traditional large-scale power system has become increasingly apparent structural aging, energy use efficiency is low, and so on. People have to think about the use of renewable energy. Because of the advantages of environmental protection, energy saving, economy and so on, distributed power generation has received extensive attention from all walks of life. Microgrid is an effective form of efficient use of distributed energy. In recent years, it has become one of the hot spots of research for the vast number of scientific and technological workers in power industry. The mission of microgrid is to provide clean, reliable and high quality power service to customers. Parallel operation of microgrid and large power grid can not only save investment, improve power quality, but also ensure the stability and flexibility of power system. There are two modes of island operation and grid-connected operation in microgrid. In the process of switching between these two modes, due to the difference of time between hardware circuit and software program, In the process of transition, the switching of control mode and operation mode of grid-connected inverter controller is different, resulting in the impact of grid-connected current and load voltage, and the seamless switching can not be achieved. In this paper, the principles of solar photovoltaic power generation, wind power generation, micro gas turbine and battery generation are discussed, and the corresponding mathematical models are established, and the working principle of the micro power inverter mentioned above is discussed and their mathematical models are established. Secondly, on the basis of discussing the control principle of solar photovoltaic power generation, wind power generation, micro gas turbine and battery inverter, the control strategy of VR / f control and weighted voltage and current control of PQ controller is given. The simulation model of micro power supply and control is built to verify the effectiveness and feasibility of the control strategy. Finally, the whole microgrid and its control model are established by using the electromagnetic transient software PSCAD/EMTDC, and the switching between the two operation modes of the microgrid is simulated. Due to the problem of dual operation mode in the switching process of microgrid, a weighted control algorithm is proposed in this paper. On the basis of double loop control of inverter controller, voltage weighting control is added in the transition process of grid connection and current weighted control is added in the process of off-grid transition by changing the value of weighting factor. After changing the control strategy, it can restrain the impact of the grid-connected current, stabilize the load voltage, and finally achieve the seamless switching of microgrid dual operation mode.
【學位授予單位】：山西大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM727;TM464

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本文編號：1890120