基于直流电力线载波通信的光伏组件监测系统

Photovoltaic module monitoring system based on DC power line carrier communication

文中针对光伏电站中对光伏组件的检测新要求,设计了一种在直流输电线缆上进行数据传输的电力线通信,使用了电流调制技术,可以满足一定规模下串行通信的要求。采用STM32M0系列32位单片机作为主控器,利用运算放大器电路搭建2ASK调制解调电路,采用电流耦合单元将信号耦合到直流电力线,组成了直流电力线载波通信系统。文中重点对电流耦合单元中磁环结构、载波频率、耦合电路、调制解调电路等对通信链路的影响进行了研究。研究发现,在磁芯上加入气隙能有效解决通信时磁饱和问题,从而实现大电流直流电力线载波通信。

To meet the new requirements for photovoltaie module detection in PV plants, a data transmission technology is designed on the DC power line. By applying current modulation, it can meet the requirements of serial communication at a certain scale. In this paper, STM32M0 series 32 microeontroller is used as the MCU, 2ASK modem is implemented by operational amplifiers, and the current coupling unit is used to couple the signal to the DC power line, constituting a DC power line carrier communication system. This paper focuses on the impacts of magnetic core structure in the current coupling unit, carrier frequency, coupling circuit, modulation and demodulation circuit on the communication links. It is found that adding an air gap into the magnetic core can effectively solve the communication problems of magnetic saturation, thus realizing the high-current DC power line carrier communication.