基于受端系统分区的多直流馈入系统落点选取方法研究

发布时间：2018-03-25 05:36

本文选题：直流输电　切入点：多直流馈入　出处：《东北电力大学》2017年硕士论文

【摘要】：我国的经济发展情况和能源储备情况大体呈逆向分布,因此电力能源大范围的流动配置成了我国电力能源的主要发展方向,国家提出了将西南地区水电向东送和南北地区互相支撑的全国联网发展战略。比较交直流两种输电形式,在运送距离、输送容量和操作控制性能方面直流输电都有其独特优势,得到了快速发展。因此,研究多直流之间的电压交互作用机理,在受端区域合理分配高密度的直流输电线路站址落点,将对以后的交直流混合电网安全稳定性和运行可靠性方面意义重大。本文针对多直流馈入输电系统的发展以及研究现状进行了简单分析介绍,通过总结已有研究成果重点分析了多直流馈入输电系统的电压交互作用机理和多馈入交互影响因子(Multi-Infeed Interaction Factor,MIIF)指标及表征直流输电电压稳定性的量化指标多馈入短路比(Multi-Infeed Short Circuit Ratio,MISCR)。针对多条直流同时落点到同一受端区域的情况,推导了多端口戴维南等值定理并建立了多直流馈入系统的等值模型,进行了等值分析。电压稳定是直流线路稳定运行的关键,直流线路的电压超出稳定范围将导致换相失败、直流闭锁等情况。本文依据电压稳定性指标MISCR和分区理论相结合分别提出了依据关联指标分区的选点方法和依据耦合作用指标聚类分区的多直流规划选点方法,针对两种不同的分区方法,分别使用线性加权法和变权评估法对分区后的方案进行了评估。最后对IEEE 14节点系统进行选点规划,通过传统方法与本文所提方法结果对比验证了本文所提出的分区指标和评估方案的有效性。
[Abstract]:The economic development and energy reserves of our country are generally distributed in reverse, so the flow and distribution of power energy on a large scale has become the main development direction of our country's electric power energy. The state has put forward a national network development strategy of sending hydropower east to the southwest and supporting each other in the north and south regions. Comparing the two forms of AC and DC transmission, DC transmission has its unique advantages in terms of transportation distance, transport capacity and operation control performance. Therefore, the mechanism of multi-DC voltage interaction is studied, and the location of high-density HVDC transmission lines is reasonably distributed in the receiving end area. It will be of great significance to the safety, stability and operation reliability of AC / DC hybrid power network in the future. In this paper, the development and research status of multi-DC feed-in transmission system are briefly analyzed and introduced. In this paper, the mechanism of voltage interaction, the multi-feed Interaction factor MIIFI index and the quantificational index of voltage stability of HVDC transmission system are analyzed. Multi-Infeed Short Circuit Ratio MISCRN. For multiple direct-current simultaneous landing points to the same receiving area, In this paper, the equivalence theorem of multi-port Davinan is derived, and the equivalent model of multi-DC feed-in system is established, and the equivalent analysis is carried out. Voltage stability is the key to the steady operation of DC line, and if the voltage of DC line exceeds the stable range, commutation failure will occur. Based on voltage stability index (MISCR) and partition theory, this paper presents a method of selecting points according to correlation index and cluster partition based on coupling action index. For two different partitioning methods, linear weighting method and variable weight evaluation method are used to evaluate the scheme after partitioning. Finally, the IEEE 14-node system is selected for point planning. The results of the traditional method and the proposed method are compared to verify the effectiveness of the proposed zoning index and evaluation scheme.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM721.1

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