Leakage Monitoring Technology Research Of Distributed Photovoltaic Power Station Based On Power Line Communication

With the large extension of photovoltaic power generation technology,distributed photovoltaic power station is very important to safe operation.Because of distributed Because the distributedphotovoltaic power generation from the array of solar photovoltaic cells to the grid inverter,there are many kinds of devices,and the distribution range is wide,making all kinds of wiring very complicated,and the long-term operation of the circuit insulation can be easily broken.Therefore,the effective monitoring of the leakage of photovoltaic power generation system is an important guarantee for the safe and reliable operation of photovoltaic power stations.Reasonable installation of leakage sensors,selecting appropriate communication methods and effectively reducing the cost of leakage monitoring will be the key to the safe operation of photovoltaic power stations.Through the analysis of the types of channel and summarizes the advantages and disadvantages,a power line communication channel as the photovoltaic power station monitoring system in the current communication mode,power line communication technology was adopted to realize distributed photovoltaic system leakage data transmission,do not need to specifically set up communication channels,has the advan tages of small investment,easy installation and flexible.The current research status of leakage current monitoring technology of photovoltaic power station is introduced.For light volt power station monitoring system of safe,effective,convenient maintenance,such as design principle,is proposed based on power line communication of distributed photovoltaic power station of leakage current monitoring system overall design scheme.And successfully set up a complete test platform.The test platform consis ts of three main modules: data acquisition module,communication module and monitoring terminal module.Secondly,the design and implementation of each system module are completed.In this paper,hall current sensor is used as the detection device for leak age current.In view of its shortcomings,the paper improves and optimizes the overall design of the sensor in the original design circuit,so as to meet the requirements of the leakage current monitoring system.The communication module USES MI200 E as the power line carrier chip and completes the design of the peripheral circuit and the central control circuit.The monitoring terminal module adopts LabVIEW as the man-machine exchange software,and the main functions of the realization are real-time data display and abnormal alarm of data.Finally,the hall current sensor and the overall leakage monitoring system for the corresponding test,the results show that the design in this paper,based on power line communication of distributed photovoltaic power station leakage monitoring system with high accuracy,improve the efficiency of distributed photovoltaic power station operation and monitoring automation level.