摘要
电网输配线故障定位对电网故障排除及供电保障有至关重要的作用。位于输配电线路两端的行波故障定位设备的同步误差决定了故障定位的基本精度。沿用GPS作为时钟同步基准,以FPGA+VCO替代传统方法的MCU+固定频率晶振构建高精度时钟同步系统,提高了系统同步精度并消除了晶振老化、器件温漂等带来的长期稳定性问题;通过模糊控制提高了系统同步速度。构建的系统同步精度优于±25ns,同步速度(系统从接收到同步源(GPS秒脉冲)至系统时钟调整锁相完成所需时间)少于90s。
Power transmission line fault location equipment plays an important role in power grid troubleshooting and power supply guarantee.The synchronization error of the acquisition system between the traveling-wave fault location equipments determines the basic accuracy of fault location.GPS was used as the clock synchronization reference,and FPGA+VCO was used instead of the traditional method of MCU+fixed frequency crystal oscillator,to build a high-precision clock synchronization system,which improved synchronization accuracy and eliminated long-term stability issues caused by crystal aging and components temperature drift.The synchronization speed was improved by fuzzy control.The system synchronization accuracy is better than±25 ns.And it takes less than 90 s from the synchronization source clock(GPS)received to the phase-locked by the system adjusted.
作者
刘辉
蔡萍
LIU Hui;CAI Ping(Department of Instrument Science and Engineering,School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《测控技术》
2020年第9期113-117,共5页
Measurement & Control Technology
