本文選題：PQ控制　切入點(diǎn)：改進(jìn)下垂控制　出處：《安徽理工大學(xué)》2017年碩士論文

【摘要】：全球經(jīng)濟(jì)迅速發(fā)展,導(dǎo)致傳統(tǒng)化石能源日益枯竭。開拓新能源是發(fā)展的必然之路。目前而言,傳統(tǒng)能源在能源的利用中依舊占很大的比重。隨著世界各國發(fā)展的深入,環(huán)境污染和全球變暖的問題日益突出,嚴(yán)重影響了人類的生存質(zhì)量。為解決發(fā)展與生存質(zhì)量的矛盾,人類必然要放眼于可再生且清潔的新能源。分布式發(fā)電系統(tǒng)的研究與實(shí)施在許多國家已經(jīng)開展起來,相應(yīng)的微網(wǎng)技術(shù)的研究成為了熱點(diǎn)。世界各國針對其對微網(wǎng)的定義和研究情況,分析了微網(wǎng)價(jià)值所在。微網(wǎng)可以當(dāng)作分布式發(fā)電系統(tǒng)與電網(wǎng)之間的媒介,微網(wǎng)技術(shù)有效地解決二者之間的矛盾,提高了能源的利用效率、減少了不可再生能源帶來的環(huán)境污染。微網(wǎng)運(yùn)行過程中,獨(dú)立和并網(wǎng)兩種模式之間的切換充分發(fā)揮了分布式發(fā)電的優(yōu)越性,為負(fù)載提供不間斷能量供應(yīng)。論文介紹了微網(wǎng)逆變器并網(wǎng)、離網(wǎng)穩(wěn)態(tài)運(yùn)行模式的控制策略,并網(wǎng)采用PQ控制,獨(dú)立運(yùn)行采用下垂控制。無論微網(wǎng)系統(tǒng)工作在并網(wǎng)還是離網(wǎng),其系統(tǒng)內(nèi)的負(fù)載電壓與電網(wǎng)電壓在相位和數(shù)值大小上都很難完全相同。所以在并網(wǎng)開關(guān)動(dòng)作之前,必須使二者電壓相位及大小同步。電網(wǎng)檢修或故障時(shí),逆變器切到下垂控制,瞬間斷開并網(wǎng)開關(guān),微網(wǎng)進(jìn)入獨(dú)立運(yùn)行模式;電能剩余或者電網(wǎng)恢復(fù)正常工作時(shí),逆變器切換到PQ控制,瞬間合上并網(wǎng)開關(guān),微網(wǎng)進(jìn)入并網(wǎng)模式。這就是微網(wǎng)的模式切換。切換過程中,由于微源種類多、切換時(shí)間不一等因素會(huì)造成電壓電流沖擊,本文提出一種基于虛擬阻抗的改進(jìn)下垂控制,使得兩種模式順利切換,很好地完成功率合理分配。論文分別在Matlab/simulink中搭建了并網(wǎng)、離網(wǎng)逆變器模型,對兩種穩(wěn)態(tài)運(yùn)行模式進(jìn)行了研究。綜合前兩種模型,完成模式切換的仿真,結(jié)果表明,兩種模式之間切換可以順利進(jìn)行。
[Abstract]:The rapid development of the global economy has led to the depletion of traditional fossil energy. The development of new energy is the inevitable way of development. At present, traditional energy still accounts for a large proportion in the utilization of energy. With the development of various countries in the world, The problems of environmental pollution and global warming have become increasingly prominent, which have seriously affected the quality of life of human beings. In order to solve the contradiction between development and quality of life, Human beings must focus on renewable and clean new energy sources. The research and implementation of distributed power generation systems have been carried out in many countries. According to the definition and research situation of microgrid, the value of microgrid is analyzed. Microgrid can be used as a medium between distributed generation system and power grid. Microgrid technology can effectively solve the contradiction between the two, improve the efficiency of energy utilization and reduce the environmental pollution caused by non-renewable energy. The switching between independent and grid-connected modes gives full play to the advantages of distributed generation and provides uninterrupted energy supply for the load. This paper introduces the control strategy of grid-connected micro-grid inverter and off-grid steady-state operation mode. PQ control is adopted in grid-connected mode. Droop control is used for independent operation. Whether the microgrid system works in grid-connected or off-grid mode, the load voltage in the system is difficult to be identical with the voltage in the power grid in terms of phase and numerical value, so before the grid-connected switch action, the load voltage in the microgrid system is difficult to be exactly the same as that in the grid voltage. It is necessary to synchronize the voltage phase and the size of the two voltages. When the power grid is overhauled or malfunction, the inverter cuts to the droop control, disconnects the grid-connected switch instantly, and the microgrid enters the independent operation mode; when the power surplus or the power grid returns to normal operation, The inverter switches to PQ control, closes the grid-connected switch instantly, and the microgrid enters grid-connected mode. This is the mode switching of the microgrid. In this paper, an improved droop control based on virtual impedance is proposed, which makes the two modes switch smoothly, and completes the reasonable allocation of power. In this paper, the grid-connected and off-grid inverter models are built in Matlab/simulink, respectively. The simulation of mode switching is completed by synthesizing the first two models. The results show that the switching between the two modes can be carried out smoothly.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM464;TM727

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