数字信号处理技术在馈线自动化终端中的应用

Application of digital signal processor in feeder-terminal-unit

在配电自动化系统中,采用馈线自动化装置对35kV以下的变电站、开闭所和10kV馈线进行实时监控,完成一次设备的电压、电流、有功、无功及谐波的采集分析,实现自动故障分析和准确的故障定位,从而提高了电能质量 并通过适当的通信方式上报主站或上级子站,为电网的安全、经济运行提供原始数据 在馈线自动化终端装置中采用数字信号处理技术以及锁相环技术实现电流、电压的交流采样和计算,并运用双CPU和双通道A/D转换的运行方式,因而提高了运算速度,增加了系统的可靠性。

Feeder-Terminal-Unit(FTU) is being used to supervise the substations under 35 kV switch-stations and 10 kV feeders real-time on-line in distribution automation system. It can not only samples and analyses synchronously the data such as voltage, current, active power, reactive power, and harmonic. from electric devices, but also accomplish automated fault analysis and accurate fault location, thus it improves the electric power quality. The information containing original data of security and economy for power network can be sent to master station through the existing communication network. Digital signal processor(DSP) and phase-lock-loop are used in FTU. It is designed based on (dual-)CPU and dual-channels-analog-to-digital converter, so it can increase calculation speed, heighten system reliability and ensure operation precision.