基于物联网技术的变频器远程监控平台研发

发布时间：2018-07-26 19:56

【摘要】：信息技术领域在经历了计算机和互联网之后,物联网被认为是新一轮的技术革命。一般来说,物联网被认为是互联网的应用扩展,它可以把任何物体与互联网连接,并进行数据交换和通信,从而实现对物品的跟踪定位、自动识别、远程监控,允许物品之间在任何时候都能方便地进行信息交互。在变频器的实际使用中,为了减少其维护的成本,提高设备运行过程中解决问题的效率,本文提出了建设变频器基于物联网技术的远程监控示范平台,该平台主要包括四个部分:变频器数据传输模块、通信转换DTU模块、云服务平台、远程监控软件。首先,变频器通过数据传输模块将运行的关键数据传输至云服务平台,同时接收来自云服务平台的远程命令。本文采用支持多从站、传输距离长、抗干扰能力强的RS485总线实现变频器数据传输模块与通信转换模块之间的通信,并定义了 RS485接口的串口协议,该协议可以自由配置数据长度、具备数据校验功能、扩展性强。然后,本文通过通信转换DTU模块实现变频器与云服务平台之间的协议转换。该模块通过GPRS通信方式与云平台使用MQTT协议进行数据交互,同时,通过RS485总线与变频器进行通信。本文通信协议的转换由STM32芯片驱动GPRS模块来实现,通过AT指令集可实现GPRS模块的连网和数据传输等功能。其次,本文通过云服务平台创建开发者账号,在创建产品信息后对通信转换DTU模块进行注册,并为其创建消息传输通道,另外,通信数据会保存在云服务平台上。云服务平台与通信转换DTU模块、远程监控软件均采用MQTT协议进行通信。最后,本文开发了远程监控软件,实现用户与设备之间的交互。所做的开发工作包括数据库表格的设计、数据库的操作、网络数据的传输、界面的设计及其功能的实现。通过设计的表格创建关系型数据库,并建立相应的数据模型,通过使用Linq语言对数据库进行操作。另外,基于MQTT协议的频道和发布订阅机制进行网络数据传输,基于.NET Framework平台设计界面,并实现了设备管理、参数读写、状态监视以及配置、控制命令、故障记录显示的功能。采用本文研发的变频器远程监控平台,用户可以通过连网,远程查看设备的故障记录,准确掌握设备的运行情况。此外,还可对变频器进行远程控制,实时调整设备的运行参数,使设备处于最佳运行状态。该平台的成功对提高变频器的智能化管理有着重要的意义。
[Abstract]:The Internet of things is considered a new technological revolution in the field of information technology after it has gone through computers and the Internet of things. In general, the Internet of things is considered an extension of the Internet of things, which can connect any object to the Internet, and exchange and communicate data, so that it can track and locate objects, identify them automatically, and monitor them remotely. Allows easy information exchange between objects at all times. In order to reduce the cost of maintenance and improve the efficiency of problem solving in the operation of the inverter, this paper proposes a remote monitoring and demonstration platform based on the Internet of things technology. The platform consists of four parts: converter data transmission module, communication conversion DTU module, cloud service platform, remote monitoring software. First, the converter transmits the key data to the cloud service platform through the data transmission module, and receives the remote command from the cloud service platform at the same time. In this paper, the RS485 bus, which supports multi-slave stations, has long transmission distance and strong anti-interference ability, is used to realize the communication between the converter data transmission module and the communication conversion module, and the serial port protocol of the RS485 interface is defined. This protocol can freely configure the length of data, has the function of data verification, and has strong expansibility. Then, the protocol conversion between inverter and cloud service platform is realized by communication conversion DTU module. The module interacts with cloud platform using MQTT protocol through GPRS communication mode, and communicates with inverter through RS485 bus. In this paper, the conversion of communication protocol is realized by STM32 chip driven GPRS module, and through AT instruction set, the functions of GPRS module networking and data transmission can be realized. Secondly, we create the developer account through the cloud service platform, register the communication conversion DTU module after creating the product information, and create the message transmission channel for it. In addition, the communication data will be saved on the cloud service platform. Cloud service platform and communication conversion DTU module, remote monitoring software using MQTT protocol to communicate. Finally, the remote monitoring software is developed to realize the interaction between users and devices. The development work includes the design of database table, the operation of database, the transmission of network data, the design of interface and the realization of its function. The relational database is created by the designed table, and the corresponding data model is established. The database is operated by using Linq language. In addition, the channel and publish / subscribe mechanism based on MQTT protocol is used to transmit network data, and the interface is designed based on. Net Framework platform. The functions of device management, parameter reading and writing, state monitoring and configuration, control command and fault record display are realized. By using the inverter remote monitoring platform developed in this paper, the user can view the fault record of the equipment by connecting the network, and accurately grasp the operation condition of the equipment. In addition, the frequency converter can be controlled remotely and the operating parameters of the equipment can be adjusted in real time to make the equipment in the best running state. The success of the platform is of great significance to improve the intelligent management of frequency converter.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN773;TP277

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