多电压等级交直流混合微电网仿真分析

发布时间：2018-05-20 21:03

  本文选题：微电网 + 多电压等级　； 参考：《沈阳农业大学》2017年硕士论文

【摘要】：微电网技术是一个备受世界各国电力工作者关注的技术,它从被提出至今不到二十年的时间里已经取得了许多突破。微电网技术之所以备受关注的原因在于它是解决零散的分布式电源利用的有效途径,此外微电网还能提高电能质量和供电可靠性。当今的世界正面临着前所未有的机遇与挑战,这种机遇和挑战是由高速发展的社会生产力和即将面临枯竭的传统能源造成的。在这样的背景下,微电网技术的优点既能够配合生产力发展过程中对能量供应的需求,又能够充分利用清洁可再生的新能源,对社会的发展有重要的意义。本文设计了一种交直流混合微电网,并对系统进行了仿真分析。首先设计了混合微电网的结构。其主要的结构特点是微电网内部有三条母线:800V直流母线、48V直流母线和380V(线电压)交流母线,分布式电源、直流负荷和交流负荷分别接在三条不同的母线上。这种结构使微电网内不同母线上的电气设备相互隔离,一条母线上的电气参数发生变化,对其他两条母线上的电气装置影响很小,从而提高了微电网的供电可靠性和电能质量。其次,根据微电网结构和控制标准制定了多电压等级交直流混合微电网的控制策略。根据系统拓扑,微电网控制策略的关键是微电网中储能元件的控制策略。根据微电网并网运行和孤岛运行两种稳定的运行状态,储能单元的控制方式也将发生变化,从而达到微电网的控制目标。最终,在MATLAB/simulink软件中建立了多电压等级交直流混合微电网的仿真模型。并分别为其两种稳定运行状态进行了仿真分析。其中并网运行考虑了两种情况:一是微电网突然接入风机;二是微网中负荷突然发生改变。通过仿真验证了设计的微电网的性能。本文的研究是对微电网技术应用方式的一种探讨,主要侧重点在于讨论微电网的结构和控制策略。通过研究验证了多母线的网架结构具有很好的电气隔离效果,能够提高微电网的电能质量和供电可靠性。综上所述,多电压等级的交直流混合微电网能够吸纳分布式电源,提高电能质量和供电可靠性;微电网能够向交流负荷和直流负荷供应电能,适用范围广泛;网架拓扑简单,控制灵活,是比较理想的微电网拓扑。
[Abstract]:Microgrid technology is a technology that has attracted the attention of power workers all over the world. It has made many breakthroughs in less than 20 years since it was proposed. The reason why microgrid technology has attracted much attention is that it is an effective way to solve the problem of distributed power generation. In addition, microgrid can also improve the power quality and reliability of power supply. Today's world is facing unprecedented opportunities and challenges, which are caused by the rapid development of social productivity and the depletion of traditional energy. In this context, the advantages of microgrid technology can not only meet the demand for energy supply in the process of productivity development, but also make full use of clean and renewable new energy, which is of great significance to the development of society. In this paper, a hybrid AC / DC microgrid is designed, and the system is simulated and analyzed. Firstly, the structure of hybrid microgrid is designed. The main structural features are that there are three busbars: 800V DC busbar 48V DC bus and 380V AC bus inside the microgrid. Distributed power supply DC load and AC load are connected to three different busbars respectively. This kind of structure makes the electrical equipment on the different bus in the microgrid separate from each other, and the electrical parameters on one bus change, which has little influence on the other two busbars, thus improving the power supply reliability and power quality of the microgrid. Secondly, according to the structure and control standard of microgrid, the control strategy of multi-voltage AC / DC hybrid microgrid is established. According to the system topology, the key of microgrid control strategy is the control strategy of energy storage element in microgrid. According to the two stable operation states of microgrid grid-connected operation and islanding operation, the control mode of the energy storage unit will also change, so as to achieve the control goal of the micro-grid. Finally, the simulation model of multi-voltage AC / DC hybrid microgrid is established in MATLAB/simulink software. The two stable running states are simulated and analyzed respectively. Two conditions are considered in grid-connected operation: one is the microgrid suddenly connected to the fan, the other is the sudden change of the load in the microgrid. The performance of the designed microgrid is verified by simulation. The research of this paper is a kind of discussion on the application of microgrid technology. The main focus is on the structure and control strategy of microgrid. It is proved that the multi-bus grid structure has good electrical isolation effect and can improve the power quality and reliability of the micro-grid. To sum up, multi-voltage hybrid AC / DC microgrid can absorb distributed generation, improve power quality and power supply reliability; microgrid can supply power to AC load and DC load, which can be used in a wide range of applications; grid topology is simple, Flexible control is an ideal microgrid topology.
【学位授予单位】：沈阳农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727;TM743
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本文编号：1916225