Research On Remote Monitoring Platform For Inverter Based On Iot Technology

IOT,which is short for Internet of Things,has become the new revolution in the area of information and technology after the computer and the Internet.In general,IOT can be deemed as an extend application of the Internet,which is able to connect any item to the Internet for data exchange and communication.It can also realize the tracking,positioning,auto identification,remote monitoring of the items,and allow the items to interact with each other conveniently at all times.For the practical application of the inverter,the remote demo platform for inverter monitoring based on IOT is developed in this paper,which aims at reducing the maintenance cost and improving the efficiency of solving problems.The platform mainly includes four parts:inverter data transfer(DT)module,communication conversion DTU module,cloud service module,remote monitoring Human Machine Interface(HMI).Firstly,the inverter uploads its critical operating information to the cloud server,meanwhile receives the remote commands from the cloud server.In this paper,the communication between the inverter DT module and the communication conversion DTU module is achieved through RS485 bus,which is characterized by multi-station support,long transfer distance,and strong anti-interference ability.The protocol for serial communication is also defined,which processes ability to configure data length freely,data check and excellent expandability.Then,the protocol conversion between the inverter and the cloud server is accomplished by the communication conversion DTU module.The module exchanges data with the cloud server through GPRS communication adopting MQTT protocol.Meanwhile,it communicates with the inverter by the RS485 bus.The drive for GPRS in STM32 realized the protocol conversion in this paper.And the function of GPRS,such as networking,data interaction and so on,is realized through the AT instruction set.Next,this paper creates an account for the inverter on the cloud server platform,and sets up a message channel for it after creating the product message and registering the communication conversion DTU module.Moreover,the communication data will be saved on the platform.The cloud server platform communicates with the communication conversion DTU module and the remote monitoring software both using the MQTT protocol.Lastly,this paper develops the remote monitoring software,which helps users interact with the devices.The development work includes design of the database table,operation of the database,data transmission of the network,design and function realization of the interface.The relational database is created through the designed tables,and the corresponding data model is also built up.And the Linq language is used to operate the database.In addition,the data transmission of the network is based on the channel and publish subscribe mechanism of the MQTT protocol.The interface is designed with the help of the.NET Framework,through which the following functions are realized,including devices management,reading and writing of parameters,monitoring and configuration of the status,control commands,and fault records indication.By using the remote monitoring platform proposed in this paper,users can remotely view the fault records of devices,and master the operating status accurately after networking.It can also control devices remotely,and adjust the operation parameters in real time to maintain the devices running in the optimal state.The successful development of this platform has great significance to improve the intelligent management of the inverter.