同塔多回输电线路动态物理模拟方法研究

Research on Dynamic Physical Simulation Method for Parallel Multi-Circuit Transmission Lines on the Same Tower

同塔多回输电线路故障情况异常复杂,对现有保护原理影响严重。研究同塔多回输电线路的动态模拟方法,实现同塔多回输电线路的物理模拟对于研究线路保护原理、开发线路保护装置和测试保护性能意义重大。文章总结了现有同塔双回输电线路的物理模拟方法,分析了现有方法用于模拟同塔多回输电线路的可行性,进而提出了采用序参数等值法进行同塔多回输电线路模拟的理论方法。考虑模拟系统与实际系统的差别,文章提出了模拟过程中互感分流元件的应用方法,并以回路数3为例论述了具体实现方法,最后总结了该方法的优点、应用特点及应用中需注意的问题,为实现同塔多回线路物理模拟创造了条件。

The situations of faults occurred in parallel multi-circuit transmission lines on the same tower are very complicated and affect principles of existing protective relay seriously. The study on dynamic simulation methods and the implementation of physical simulation for parallel multi-circuit transmission lines on the same tower are of great significance for the research on the principle of transmission line protection; the development of line protection devices and the testing of protective relay. Existing physical simulation methods for parallel multi-circuit transmission lines on the same tower are summarized, and the feasibility of applying existing physical methods to the simulation of parallel multi-circuit transmission lines on the same tower is analyzed, and then a theoretical method, in which the sequence parameter equivalence is utilized to simulate parallel multi-circuit transmission lines on the same tower, is proposed. Considering the differences between simulated power system and actual power system, an application method of mutual inductance components during simulation process is put forward, and taking three circuit transmission lines on the same tower for example, the concrete implementation of the proposed method is expounded. The advantages and the features of the proposed method as well as the problems to be paid attention to during the simulation process are presented.