直流配电网拓扑结构与可靠性研究

发布时间：2018-04-15 09:29

本文选题：直流配电网 + 拓扑结构　；参考：《华北电力大学》2014年硕士论文

【摘要】：随着经济的发展与人民生活水平的提高,口益增长的负荷与输电走廊输送电力限制之间的矛盾逐渐显现,我国现有交流配电网供电半径小、供电能力有限,不足以承担未来社会对配电网的要求；相比之下,直流配电网具有线路成本低、传输容量大、供电范围远、网络损耗小、电能质量高、转换效率高等优势,成为未来配电网的发展方向。本文以直流配电网的拓扑结构与可靠性为主要研究内容,从配电网络的元件连接方式与运行方式角度出发,在现有的应用在通信系统、船舶系统、地铁电力牵引系统和航天动力系统的结构与成熟交流配电网的结构的基础上,以直流配电的特性为依据,提出交直流混合配电系统和纯直流配电系统的可行拓扑结构,并对交直流环型网络运行方式进行了比照分析。通过对现有可靠性模型评估方法的对比研究,本文选取能够对电网进行实时模拟的序贯蒙特卡洛评估方法,为保证计算的精度和速度,运用了故障遍历方法对故障与负荷进行两次搜索,通过对负荷的分类完善了统计可靠性指标的方法。最后,文章将提出的模型和算法应用到IEEE RBTS Bus6节点算例中。通过对交流模式下系统与负荷可靠性指标的计算,验证了模型和算法的科学性、准确性；应用此算例与算法,同时计算了现有设备下直流配电系统的可靠性指标,并对电力电子器件进行了适应性分析,最终对所得结果进行了详细的阐述。
[Abstract]:With the development of economy and the improvement of people's living standard, the contradiction between the increasing load and the limit of transmission power in the transmission corridor gradually appears. The current AC distribution network in our country has a small power supply radius and limited power supply capacity.By contrast, DC distribution network has the advantages of low line cost, large transmission capacity, long power supply range, low network loss, high power quality and high conversion efficiency.Become the future distribution network development direction.In this paper, the topology and reliability of DC distribution network are taken as the main research contents. From the point of view of component connection and operation mode of distribution network, it is used in the existing communication system and ship system.Based on the structure of metro traction system and space power system and the structure of mature AC distribution network, based on the characteristics of DC distribution, the feasible topology of AC / DC hybrid distribution system and pure DC distribution system is proposed.The operation mode of AC-DC ring network is compared and analyzed.By comparing the existing reliability model evaluation methods, this paper selects sequential Monte Carlo evaluation method which can simulate the power network in real time, in order to ensure the accuracy and speed of calculation.The method of fault traversal is used to search the fault and load twice, and the statistical reliability index is improved by classifying the load.Finally, the proposed model and algorithm are applied to the IEEE RBTS Bus6 node.By calculating the reliability index of the system and load in AC mode, the scientific and accuracy of the model and algorithm are verified, and the reliability index of DC distribution system under the existing equipment is calculated by using this example and algorithm.The adaptability of power electronic devices is analyzed, and the results are described in detail.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM732

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