基于电压锁相网络化采样的母线保护研究

Networking sampling busbar protection based on voltage phase lock

设计一种既具备结构简单、资源共享、扩展性好等优点,又不依赖于外部全局同步系统的采样值组网传输的母线保护,在数字化变电站的建设中具有十分重要的意义。介绍了数字化变电站母线保护的采样值传输系统,描述了基于绝对延时的点对点母线保护技术,提出了一种基于电压锁相的网络化母线保护方案。利用母线电压天然的同步性能特征,通过数字锁相环及采样重插值技术,消除网络化采样对同步信号的依赖性。测试表明,基于电压锁相的网络化母线保护采样同步性好,动作快速可靠,是数字化变电站母线保护的一种新思路。

A sampling value network transmission bus protection independent of outside global synchronization system is designed. The protection has the advantages of simple structure, resource sharing and good expansibility, so it has very important significance in the construction of digital substation. This paper introduces the sampling transmission system of bus protection in digital substation, describes a point-to-point bus protection technology based on absolute delay, and proposes a network bus protection using voltage phase lock. The synchronization performance of bus voltage, digital phase locked loop and resampling interpolation are used to eliminate the synchronization dependence in network sampling system. Experiments show that the bus protection based on voltage phase lock is well synchronous, fast and reliable. This method is a new solution for the bus protection of digital substation.