新型磁阀桥式超导限流器对继电保护正确动作影响的分析

发布时间：2018-08-08 19:01

【摘要】：我国的电力系统已经具有超大容量、大负荷、高电压等级、远距离输送等特点,使得短路阻抗越来越小,导致输电线路发生短路时的故障电流也会越来越大。随着电网的不断发展,导致电网中现在使用的断路器已经无法或即将无法将线路断开,这对电网的运行将会产生极大的不良影响,因此研究对短路电流水平的抑制的方法就成为一个重要的课题。本论文在深入理解磁阀电抗器和桥路型超导限流器的基础上,提出了新型磁阀桥式超导限流器。本论文分别对磁阀电抗器和桥式超导限流器进行仿真,验证了其作用。对提出的新型磁阀桥式超导限流器的工作原理和结构进行阐述与说明,根据等面积定则分析了该元件对电力系统暂态稳定的影响；根据输电线路距离保护的原理,分析了该元件对距离保护产生的影响,并利用PSCAD搭建该元件的模型,仿真其对距离保护的影响；根据输电线路电流差动保护的原理,分析了该元件对线路电流差动保护产生的影响,并利用PSCAD进行仿真。分析与仿真的结果表明,新型磁阀桥式超导限流器能够提高电力系统的暂态稳定；新型磁阀桥式超导限流器对电网的距离保护的影响与该元件的安装位置有关系,当该元件安装在保护装置的上游时,对距离保护没有影响,当该元件安装在保护装置的下游时,可能会造成距离保护的拒动；新型磁阀桥式超导限流器对输电线路电路差动保护没有影响。
[Abstract]:The power system of our country already has the characteristic of super capacity, large load, high voltage grade, long distance transmission and so on, which makes the short circuit impedance smaller and smaller, and the fault current will be larger and bigger when the short circuit occurs in the transmission line. With the continuous development of the power grid, the circuit breaker used in the power network has been unable or will soon be unable to disconnect the line, which will have a great negative impact on the operation of the grid. Therefore, the research on the suppression of short-circuit current level has become an important issue. Based on the deep understanding of magnetic valve reactor and bridge type superconducting current limiter, a novel magnetic valve bridge superconducting current limiter is proposed in this paper. In this paper, the magnetic valve reactor and the bridge superconducting current limiter are simulated, and their functions are verified. The working principle and structure of the new magnetic valve bridge superconducting current limiter are expounded and explained. The influence of the element on the transient stability of power system is analyzed according to the equal area rule, and the principle of transmission line distance protection is also discussed. The influence of the element on distance protection is analyzed, and the model of the element is built by using PSCAD to simulate the influence of the element on distance protection, and according to the principle of transmission line current differential protection, The effect of this element on line current differential protection is analyzed and simulated by PSCAD. The results of analysis and simulation show that the new magnetic valve bridge superconducting current limiter can improve the transient stability of power system, and the influence of the new magnetic valve bridge superconducting current limiter on the distance protection of the power network is related to the installation position of the element. When the element is installed upstream of the protective device, it has no effect on the distance protection, and when the element is installed in the downstream of the protective device, it may cause the distance protection to be rejected. The new magnetic valve bridge superconducting current limiter has no effect on the differential protection of transmission line circuit.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM471;TM77

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