基于NB-IoT的分布式光伏电站漏电监测系统

NB-IoT based electric leakage monitoring system for distributed photovoltaic power station

针对分布式光伏电站缺少漏电流无线监测设备的实际情况,介绍一种基于NB-IoT(窄带物联网)无线高精度磁调制电流传感器的漏电监测系统。该系统由感知层、传输层、平台层和应用层四部分构成。通过对影响磁调制传感器精度的定性和定量研究,提出双磁芯半波激励方案,优化传感器设计,提高其精度。汇流箱中的电流传感器采集数据信息通过单片机经由NB-IoT网络传输至云平台。该系统能够实现使用云平台对分布式光伏电站系统漏电流进行在线实时监测和故障定位,且能有效解决分布式光伏电站的漏电监测问题。

In view of the actual situation that the distributed photovoltaic power stations lack electric leakage monitoring equipments,an electric leakage monitoring system based on high-precision wireless magnetic modulation current sensor of NB- IoT(narrow-band Internet of Things)is introduced. The system consists of perception layer,transport layer,platform layer and application layer. By means of the qualitative and quantitative research on the accuracy of magnetic modulation sensor,a double- core half-wave excitation scheme is proposed for optimizing the sensor design and improving its accuracy. The current sensor in the junction box is applied to collecting the data information which will be sent to the cloud platform through the NB -IoT network. The system can realize on - line real - time monitoring and fault location of electric leakage devicesof distributed photovoltaic power stations using cloud platform,and the electric leakage monitoring of distributed photovoltaic power stations.