Design And Implementation Of Multi-mode Terminal Of Electric Energy Data Acquisition System

State Grid of China have proposed a strategic development goal building “strong smart grid”,which leading to a whole new level development of smart grid construction.Electric energy data acquisition system plays a vital role in smart grid construction,which is also the important part to realize power grid construction.The construction of electric energy data acquisition system can be divided into several parts: client,the electric energy data acquisition system,communication channel,intelligent terminal,and electric field.Intelligent terminal is the most important part of electric energy data acquisition system,however,it have many technical problems,just like single access network,network coverage,network reliability,which limit usage of terminal.A multi-mode terminal based on LTE-230 private network and GPRS public networks is proposed in this paper.STM32F107VCT6 microprocessor is the core of hardware platform is used for this design,and ?C/OS-? embedded real-time operating system is applied as the software platform.In this paper,the main work can be summarized as follows:(1)The demands of multi-mode terminal are thoroughly analyzed,which is mainly applied in electric power acquisition and power business marketing and distribution automation management.Meanwhile,the principle and system of LTE-230 and GPRS network are also researched.(2)In the aspect of hardware design,focusing on the entire hardware architecture,the hardware architecture is divided into the control side,the network side,the user side and other peripheral interface.The design and implementation of each module are described in detail.And the reason for choosing ?C/OS-? operating system is listed after a comparative analysis of several embedded real-time operating system.(3)In the design of the system software.?C/OS-? operating system is chosen after a briefly comparison and ported into STM32F107VCT6 microprocessor.Driver of communication is designed and application is written.Software system architecture is researched in detail.And the logic of the internal data of the multi-mode terminal and data transmission process are explicitly introduced in this paper.The conversion of protocol of communication is realized by software.In this paper,conversion test,communication test and interface test are carried out on the multi-mode terminal.The results of test indicate that Multi-mode terminal are in accordance with the design requirements.Multi-mode terminal can provide data acquisition and data forwarding for the power system,which plays an important role for the further realization of smart grid in technical support.