基于数字化变电站的集中式保护研究

Study of centralized protection based on digital substation

阐述了数字化变电站的研究现状。针对现有微机保护无法共享信息的缺陷,提出了基于数字化变电站的集中式保护的概念。集中式保护在原理上以变电站作为完整的保护对象,统一考虑全站的保护功能;在技术上以先进的智能一次设备、可靠的网络通信为基础;在逻辑上采用两层配置方案:以差动保护为主的单元保护模块作为间隔级保护,以基于拓扑理论的网络保护模块作为全站系统级保护。介绍了集中式保护的硬件系统构成、对象建模以及保护功能的实现。试验证明了基于数字化变电站的集中式保护的可行性。由于实现了广泛的信息共享,有利于提高保护性能,提高对电网运行方式变化的适应能力,降低长期运行成本。

The present study status of digital substation is described in this paper. With the obvious deficiencies of unable information sharing in the microprocessor-based protection, a new concept of centralized protection is proposed. And the whole substation is taken as an integrated protection object to consider its full protection functions. The centralized protection chooses advanced intelligent primary equipments and reliable network as its basis. Logically, the protection scheme is constituted with two layers including the differential protection as interval-level unit and the network protection based on topology theory as system-level protection unit. In addition, the paper also introduces the hardware framework of centralized protection, object modeling as well as the realization of protection functions. Through tests, the feasibility of centralized protection based on digital substations is improved. The centralized protection based on digital substation, sharing a wide range of information, promotes relay＇s performance, enhances the adaptation capacity of network operation mode change, and lowers long-term system running costs.