特高压联网后电网限流措施和分区原则的研究

发布时间：2018-06-21 07:28

本文选题：特高压 + 短路电流　；参考：《华北电力大学》2014年硕士论文

【摘要】：“三华”特高压电网联网以后,1000kV/500kV/220kV高中低压电磁环网运行导致特高压变电站周边500kV变电站短路电流超标,需要采取有效的限流措施来降低短路电流,为电力系统的安全稳定运行做出保证。研究特高压电网短路电流控制措施以及电网分层分区方法,将有利于我国电网的继续建设,更有利于未来我国电网的规划。本文主要从降低系统短路电流的角度出发对特高压输电网络进行研究,以特高压输电特点作为研究出发点,综合采取各种限流措施和进行电网分区作为解决问题的手段。以“三华"电网中的华北电网为例研究了特高压联网后,特高压变电站对500kV站点短路电流水平带来的影响；对各种限流措施在特高压输电中的适用性进行了研究,从常用的限制短路电流的手段中找出适于用特高压输电的限流措施；建立了电网分区的模型,并基于此模型分别从安全性、稳定性、经济性、合理性、独立性出发,提出了含有特高压输电线路电网的分区原则、具体实现方法和计算流程,以北京电网为例对此进行了验证；针对华北电网,考虑限流效果、安全稳定性、经济等因素,结合1000kV变电站及其周边短路电流分布情况,综合应用多种限流措施,设计一种优化限流方案,并仿真验证该方案的合理性。特高压联网采取有效的适用于特高压输电技术的电网限流措施和与之匹配的分区原则的能够很好的降低系统短路电流。
[Abstract]:After the "Sanhua" UHV power grid is connected to the Internet, the operation of 1000kV / 500kV / 220kV low-voltage electromagnetic loop network causes the short-circuit current of the 500kV substation around the UHV substation to exceed the standard, so it is necessary to take effective current-limiting measures to reduce the short-circuit current. To ensure the safe and stable operation of power system. The study of the short-circuit current control measures and the method of dividing the power grid into layers will be beneficial to the continuous construction of our country's power grid and the planning of our country's power grid in the future. In this paper, the UHV transmission network is studied from the angle of reducing the short-circuit current of the system. The characteristics of UHV transmission are taken as the starting point of the research, and a variety of current limiting measures and power network zoning are taken as the means to solve the problem. The influence of UHV substation on short-circuit current level of 500kV station is studied by taking North China Power Grid in Sanhua Power Network as an example, and the applicability of various current limiting measures in UHV transmission is studied. The current limiting measures suitable for UHV transmission are found out from the common methods of limiting short circuit current, and the model of power grid partition is established, based on which the security, stability, economy, rationality and independence are considered respectively. This paper puts forward the partition principle of UHV transmission line network, the concrete realization method and calculation flow, and takes Beijing power grid as an example to verify this, considering the effect of current limiting, safety and stability, economy and other factors, etc. Combined with the distribution of short-circuit current in and around 1000kV substation, an optimized current limiting scheme is designed by synthetically applying various current limiting measures, and the rationality of the scheme is verified by simulation. The UHV network can reduce the short circuit current of the system by adopting effective current limiting measures and matching partition principle which is suitable for UHV transmission technology.
【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

【参考文献】