变电站电力时间同步系统在线监测措施研究

电力时间同步系统的应用,可以改善变电站的运行安全性及稳定性,是维护生产安全的重要系统,受到电力工作人员的高度重视。尤其是在二次设备的运行过程中,会出现时间同步异常的状况,这是影响设备运行性能的主要因素,不利于电力生产工作的顺利开展。电力时间同步系统的应用,能够实现在线监测的目的,真正消除电网运行中的安全隐患,为企业创造良好的效益。文章将对变电站电力时间同步系统的应用现状加以分析,明确变电站电力时间同步系统的在线监测技术,探索变电站电力时间同步系统在线监测的措施及方案。

北斗、GPS卫星授时在电力系统时间同步装置中的应用

电力系统时间同步装置在维持电力系统正常运行控制、事故分析等方面起着极其重要的作用。对北斗、GPS卫星导航系统进行介绍的同时进行差异对比,阐述了卫星授时机理;探讨了卫星授时技术在电力系统中的应用。采用北斗加GPS双时源卫星授时的时间同步装置成为当前电力系统时间同步的主流方案。

电力系统时间同步在线监测技术分析

电力系统时间同步的准确性是保障电力系统运行控制和故障分析的重要基础条件。近年来,电力系统时间同步装置在运行中出现时钟异常跳变、时钟源切换策略不合理及电磁干扰环境下性能下降等问题,促进了在线监测技术的发展。

Estimation Method of Center of Inertia Frequency Based on Phasor Measurement Data

In the world, recent increased disturbances, congestion management problems, and increases of complexity in operating power systems have brought the need for integrations and improvements of power systems. Advanced applications in WAMPAC （wide area monitoring, protection, and control） systems provide a cost effective solution to improve system planning, operation, maintenance, and energy trading. Synchronized measurement technology and the application are an important element of WAMPAC. In addition, PMUs （phasor measurement units） are the most accurate and advanced time-synchronized technology available for WAMPAC application. Therefore, the original measurement system of PMUs has been constructed in Japan. This paper describes the estimation method of a center of inertia frequency by applying actual measurement data. The application of this method enables us to extract power system oscillations from measurement data appropriately. Moreover, this proposed method will help to the clarification of power system dynamics and this application will make it possible to realize the monitoring of power system oscillations associated with the power system stability.