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近年来,光伏发电得到了快速发展,但仍存在着各种技术问题。整个光伏电站的数据监控是一个非常重要的部分,其中汇流箱是数量最多的设备,采用何种方式监测各个汇流箱的电参数变得尤为重要。目前,汇流箱均采用RS485接口有线连接方式进行数据采集通信,这样一来,在工程施工时需先预埋通信电缆,且系统扩展和维护也不方便;此外,在工程现场调试时发现光伏电站存在着很强的共模干扰,极大影响了RS485通信的稳定性。
In recent years, photovoltaic power generation has been rapid development, but there are still a variety of technical problems. Data monitoring of the entire photovoltaic plant is a very important part, of which the combiner box is the largest number of devices. It is particularly important to monitor the electrical parameters of each combiner box in a variety of ways. At present, the combiner boxes all adopt the RS485 interface wired connection for data collection and communication. As a result, the communication cable must be embedded in the project construction, and the system expansion and maintenance are inconvenient. In addition, during the on-site commissioning of the project, the photovoltaic power station There is a strong common mode interference, which greatly affects the stability of RS485 communication.