柔性直流配电网可靠性评价方法研究

发布时间：2018-04-30 13:56

本文选题：直流配电网 + 最小割集法　；参考：《浙江大学》2015年硕士论文

【摘要】：随着电力电子技术的发展,相比于交流配电,直流配电在接纳分布式电源和直流负荷、提高供电容量和改善电能质量等方面的优势日益突显,引起了学者们的关注。直流配电网中,复杂的网络拓扑结构、大量电力电子元件和高渗透率分布式电源的接入,都会导致传统交流配电网的可靠性评价方法无法适用。因此,为更好地评价直流配电网的电力系统可靠性,获取最优的直流配电网拓扑结构,明确高可靠性城市配电网的发展方向。本文就中压柔性直流配电网的可靠性评价进行了深入研究。综述了传统交流配电网、含微网的交流配电网、高压直流输电的可靠性评价方法,建立了VSC换流站,直流变压器和直流断路器的可靠性分析模型,分析了高渗透率分布式电源对直流配电网可靠性的影响,综合考虑直流负荷、单极运行和备用电源等因素,形成适用于直流配电网的改进最小割集法；然后拟定了辐射状、环状或“手拉手”三种直流配电网的典型拓扑结构,采用改进最小割集法进行对比择优；最后,对比了现阶段交、直流配电网的可靠性水平,分析了限制直流配电网可靠性水平的关键因素,就直流配电网的发展方向提出了建议。
[Abstract]:With the development of power electronics technology, compared with AC distribution, DC distribution has more and more advantages in accepting distributed power source and DC load, increasing power supply capacity and improving power quality, which has attracted the attention of scholars. In the DC distribution network, the complex network topology, a large number of power electronic components and high permeability of distributed power supply will lead to the traditional AC distribution network reliability evaluation method can not be applied. Therefore, in order to better evaluate the power system reliability of DC distribution network, obtain the optimal topology of DC distribution network, and clarify the development direction of high-reliability urban distribution network. In this paper, the reliability evaluation of medium voltage flexible DC distribution network is studied. The reliability evaluation methods of traditional AC distribution network, AC distribution network with microgrid and HVDC transmission are summarized. The reliability analysis models of VSC converter station, DC transformer and DC circuit breaker are established. This paper analyzes the influence of high permeability distributed generation on the reliability of DC distribution network, synthetically considers the factors such as DC load, unipolar operation and standby power supply, and forms an improved minimum cut set method suitable for DC distribution network. The typical topology of three kinds of DC distribution network, ring or "hand in hand", is compared and selected by using the improved minimum cut set method. Finally, the reliability level of the current AC and DC distribution network is compared. The key factors limiting the reliability level of DC distribution network are analyzed, and some suggestions for the development of DC distribution network are put forward.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM721.1

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