Centralized automatic meter reading system based on GPRS technology

Transcription

1 2016 Sixth International Conference on Instrumentation & Measurement, Computer, Communication and Control Centralized automatic meter reading system based on GPRS technology Liuan, Wangang, LiuShanShan The higher educational key laboratory for school of Measure-control Technology and Communication Engineering of Heilongjiang Province, Harbin University of Science and Technology, Harbin , China Corresponding Author: Wangang Abstract With the continuous reform and innovation of science and technology, as well as the implementation of the comprehensive construction of smart grid strategic objectives, so that the development of the power industry has been a qualitative leap. Under the support of GPRS technology of mobile communication company in our country, the electricity meter reading system breaks the disadvantages of the traditional manual meter reading method, which saves a lot of labor cost and improves the quality and efficiency of the power meter reading, the centralized meter reading system has a series of advantages, such as high speed, high degree of automation and high accuracy, the electric power enterprise fully realized the importance of the centralized meter reading system under the GPRS technology. This paper will further analyze and discuss the centralized meter reading system based on GPRS technology. Keywords GPRS Technology; Concentrator; GPRS technology52 I. ITRODUCTIO It is an age of information and technology, the development of electric power enterprises must keep pace with the times, keep up with the pace of the times. The electric power enterprise to innovation, breaking the drawbacks of the original manual meter reading, meter reading to reduce the workload, high efficiency, realize the intelligent meter reading work. In 1990s, the remote meter reading system as a new mature technology has begun large-scale promotion in foreign countries, France is preparing to implement the 400 thousand smart meter pilot program, India has carried out many projects to improve the domestic electric power service, plans to invest $100 billion in 2012 to achieve household electricity, and will replace the 100 million electric power meter, built power line carrier remote meter reading and prepaid meter reading system, the UK has basically achieved the industrial and commercial users and some of the residents of the user's electricity consumption information automatic collection. China State Grid Corp announced to the public for the first time in 2009 announced the "smart grid" development plan will be divided into three stages and gradually advancing to the 2020 full completion of a unified "strong smart grid" [1]. Centralized meter reading media can be a low voltage power line, twisted pair, coaxial cable and optical fiber cable, due to the low voltage line load and different, the harmonic interference large using power line as a communication medium, has reliable performance and low, low success rate of the meter reading, and twisted pair, coaxial cable and optical cable need to set up a communication line and the cost is high [2].at the same time, GPRS technology can also carry out data processing, which has a wide range of coverage, reliable communication, simple structure and low operating cost characteristics. Therefore, the power enterprises need to continuously improve the efficiency and accuracy of meter reading, under the aid of GPRS Technology, reasonable application of power meter system, realize the automation and intelligent meter reading work, ensure the accuracy of the power data acquisition, real-time and integrity, and promote the steady and sustainable development of the electric power industry. This article through analysis the actual situation on the existing distribution network, using the GPRS less communication technology, through the GPRS electric energy acquisition terminal users of electricity data and other required information real-time acquisition and transmission to the main station, realize the measurement point of power real-time acquisition and monitoring control, improve the overall level of the power management system. II. OVERALL SSTEM DESIG A. System overview The electric meter reading system based on GPRS technology is mainly composed of three parts, which are data acquisition module, data transport module and data management module. The work content of each module is responsible for all inconsistent. Among them, the data acquisition module is composed of a collector and power meter group, the use of power line carrier communication to achieve the residential user electric energy data acquisition, and to a concentrator electricity data transmission. The data transmission module is constituted by the concentrator, power collected by the collector through the power line transmission to the concentrator, and then through the GPRS less communication network to the backstage management module for electric power transmission residents community information, to complete all the user electric meter data transmission. Data management module is composed of the backstage management center server, mobile VP access equipment and other hardware. It can finish Data storage, analysis and research of all user electric energy meter [3-4]. Residential areas concentrated meter reading system based on /16 $ IEEE DOI /IMCCC

2 GPRS network from the mobile communication in our country, the data information of electric power enterprises through the GPRS network for efficient transmission. Power companies will each city residential areas meter successfully connected to a data acquisition terminal and each electric meter data can in the forms of power carrier is transmitted to the concentrator, the concentrator will all data acquisition and analysis are stored after the data transmission of GPRS network to the enterprise control station, in order to effectively complete the cell meter data and master online connection [5], figure 1 shows a system total frame diagram. Figure 1 General block diagram of the system Multiple rate watt hour meter Intelligent meter reading management system GPRS Concentrator 220V low voltage power line carrier comm unicati on Data acquisition terminal Data acquisition terminal Electric energy meter 1 Electric energy meter n B. System measurement section 1) Specifications: Table I GPRS multi-function meter measurement specifications Voltage Electric Accuracy grade Connection mode 3*57.7/100 V current 0.3(1.2)A 3*100V 0.3(1.2)A 3*220/380 V Active 0.5 or 0.5S level Reactive power 2 Active 0.5 or 0.5S level Reactive power 2 Active 1, reactive power 2 Active 1, reactive power 2 Three phase four Three phase two Three phase four 2) Environment condition Table II GPRS multi function table for the use of the environment conditions air temperature relative humidity atmospheric pressure 86kPa 108kPa Applicable height Altitude below 2500m (2)The following figure 2 is a new type of GPRS acquisition terminal equipment. Figure 2 GPRS acquisition terminal equipment III. SSTEM TECHOLOG THEOR A. GPRS Technology GPRS communication as a new less data transmission service developed from the original GSM system, support IP protocol and X.25 protocol, and other packet networks for global less access, the effective realization of social business communication from point to point. With the support of GPRS technology, the electric power enterprise can realize the information's less transmission. improve the acquisition efficiency and quality of the power information data, the maximum extent to enhance the communication level of power enterprises. At the same time, the GPRS network is charged according to the actual traffic flow, and the cost of communication is less, which can promote the steady and sustainable development of the enterprise.this system is using the SIM800 module, SIM800 module design low power consumption in sleep mode, the minimum flow is only 1mA, a total of 24 pins, support GPRS encoding format of CS-1, CS-2, CS-3 and CS-4 [6]. areas (industrial enterprises) user's digital meter data acquisition terminal is connected to the GPRS through the serial port, then the data to IP packet, and then through the GPRS air interface access to the GPRS network, the GPRS gateway and routing analysis and management system of Power Supply Bureau received electricity, processed and analyzed the data. Because the electricity meter using power system and the vast majority of industrial and mining enterprises is the RS485 interface, or direct acquisition of pulse counting, this platform can provide two RS485 interface and 64 pulse acquisition interface, an RS485 interface with up to 128 meters, therefore, each terminal collector can take 256 meter and 64 digital pulse meter, figure 3 the GPRS module within the chip circuit. Figure 3 GPRS module internal chip circuit V_4V0 C uF C907 C uF 0.1uF P13 VDD_EXT RXD P12 TXD DTR TESTRAD RI U902 VBAT VBAT ETLIGHT VDD_EXT RXD TXD DTR RIG AT_RF PWRKE RESET DSR ADC SIM_VDD SIM_RST SIM_CLK SIM_DATA SIM800GState Grid SIMCOM 21 Antenna RST 17 DSR 16 ADC SIMRST 12 SIMCLK 11 V_4V0 V_2V8 R951 2KΩ R950 10KΩ J_O V908 PWRKE 2SC1623 C911 D907 33pF J_RST SR0320MW2 C903 10pF SIMVCC C902 R905 1uF 4.7KΩ P3 SIMVCC GPRS module protocol conversion success first start SOCKET communication interface, after GPRS module obtained dynamic IP, access to GPRS network, to initiate a connection request to the data center, establish a connection, and then data transmission. B. Data Acquisition Module 1)Electric meter data acquisition 550

3 In the relative concentration of residents residential meters, the collector should be placed in a household meter box, use RS-485 lines to the connection, data transmission is realized using low voltage power line carrier and concentrators. Residents residential power concentrated meter reading system and the data management module block can use GPRS technology to access concentrator to collect data. Figure 4 for specific network connection mode. Figure 4 Structure of electric meter data acquisition system User unit 1 receive a reply to verify data correctness, after the completion of the data processing is the next cycle. The whole process is shown in Figure 6 below. Figure 6 Flow chart of meter reading task Task start Whether to meter reading time Get electricity meter time 10KV 380V/220V RS485 Interface Collector Electric energy meter Package and send commands Accept copy read reply Background management center GPRS Concentrator Electric Collector energy meter RS485 Interface Verify that the data is correct data storage User unit 2 2)Concentrator The system of meter data acquisition is the acquisition terminal to connect the RS-485 to obtain electric energy meter, in the acquisition of equipment installed with carrier communication device. concentrator is set at the residential area by the transformer staff, through the use of voltage of power line carrier communication mode and data acquisition terminal together effectively, the master station and electric power enterprises then the GPRS connection concentrator as an important communication hub of GPRS system, its main function is to receive the orders of the master station, the data will be collected information in GPRS network under the realtime transmission of the [7]. concentrator can be used as an important transit meter data transmission station, so it needs to have the corresponding storage function, if the less in the case of network congestion which must be able to realize the data storage and buffer cache, to fully improve the accuracy and reliability of data transmission. Figure 5 for the concentrator design circuit diagram. Figure 5 Concentrator design principle diagram Concentrator usually consists of meter reading day, meter reading, and the whole point of meter reading, zero meter reading of all kinds. Concentrator start reading task function, then detect the current time is in accordance with the set of reading time, does not conform to continue to the next round of inspection, or access to information to the reading of the meter, then to the meter to send the command frame and C. Data transmission module Through the data transmission module, the electric power enterprise to each meter within the jurisdiction of the district resident real-time data reading, data remote transmission, to focus on a single user or for reading, it can realize automatic data transmission of electric meter reading meter reading staff. Without the deployment of GPRS technology the residential power centralized data communication between the meter reading system based on the data management module and the concentrator is one of the crucial link between the two. To carry out communication and stable are based on GPRS technology. The system for multiple power concentrator subordinate information data collector, which is higher by GR47 less communication technology to realize data exchange and data management module.the concentrator core equipment for the ARM chip, the use of GR47 less communication technology data using GPR S data is sent to the management module. Such as the data management module of electric energy meter to carry out real-time control, you can send the password to the server communication, and communication server will command using GPRS technology is transmitted to the concentrator of less communication module, and then use the concentrator in the power line carrier communication module, transferring it to a collector. Finally, the electric energy meter is executed by the collector [8]. D. Date Management Module 1)Management software introduction When the collector collects data on electric energy meter, can be processed with statistical analysis of the data. In view of power communication has certain stability, therefore, the data management module to real-time monitoring of the power communication, once the problem should be the first time the software maintenance data management module of the system [9].is an extended Microsoft platform based on Framework.ET, using SQL Server database. This system has 551

4 all functions of traditional meter reading system, and has the advantages of simple operation, user-friendly humancomputer interaction, can provide a number of additional functions based on centralized meter reading. For example, the meter data statistics and electricity detection. In general, management the whole software as the top meter reading system, the GPRS technology can realize online communication and place between the concentrator, real-time access to the electric power data for analysis for processing, and then stored in the corresponding database, to facilitate the use of future query. Another important function of the master station software is to concentrator initiated various commands and in no time the operation control [10]. 2)Main realization function The main function of the data management module includes: 1) the power data acquisition function; can realize remote real-time or timing electric meter to collect data, and to batch operation; can refer to the concentrator's response to analyze the network communication status and the working state of the equipment; in the process of operation, the module can be used a pair of a plurality of concentrators to send instructions to.2) design data management function. All data and data management module can be related to the centralized meter reading to add, delete, edit and query; can work parameters of the concentrator and index set.3) access and session management. The operation scheme of the module can set different permissions the administrator can give different grades to the operator with different access permissions, to fully guarantee the stability and reliability of the system, and Can be different levels of operator's responsibility and clear division of responsibilities and facilitate the centralized meter reading; can write operating staff log, operation personnel changes to the module all, write and other operations can be recorded, to need in the future, when it query. 4) Other functions. The module can be a variety of ways to achieve the data backup. Including manual and automatic backup, to fully guarantee the integrity of the data of electric power meter reading and completely. And it also has the data reduction function, when the damaged data can use this function to achieve the restoration of. Figure 7 shows the number of according to the flow chart of the management module. Figure 7 Data management module flow chart entrance Serial port open IV. SSTEM TEST The system can meet the following meter reading and storage requirements: Real-time / reactive power; day / month total with / without work electric energy (total, the rate); the reverse has / reactive power indication (total, the rates of); month forward and reverse a / reactive maximum demand and time of occurrence (total, the rate; day / month is reverse / reactive electric energy; real time gross and phase separation / reactive power, power factor; real-time voltage current; a, B, C three phases broken phase statistics data and a broken record more recently march in Zhejiang testing this system, when reading the positive and negative active, reactive power, because the price is different so the rates shown different as shown in Figure 8. Figure 8 Electricity meter reading data When the system copy three-phase meter data, the A B and C three-phase power data collection, as shown in Figure 9. Figure 9 Three phase data When the user only in the rate of four when the power of the test results as shown in Figure 10 below. Figure 10 Daily meter reading data To send a request from a station Receive data from station Data error Put in cache Quit Copied Close Port The above test results show that GPRS technology and centralized meter reading system, combined with the success 552

5 of meter reading, improve the overall level of electricity management. V. COCLUSIO To sum up, with the development and application of GPRS technology, automatic meter reading system has been the development of residential users running vigorously, it has good safety and reliability, can be the first time for the meter reading data accurately, significantly reduce the electric power enterprise human resources cost, improve work efficiency and quality of reading business, create the more economic and social benefits for the enterprise, to promote the sustainable development of power industry. In this paper, based on the application of GPRS less communication technology, through the acquisition terminal the user data and other required information real-time acquisition and transmission to the main station, effectively solve the problem of data acquisition and less transmission of electric energy meter, data to achieve the effective management has at home to practical application, bring better economic benefits for the development of China's electric power service for power supply enterprises. In our country in the" Strong smart grid" planning, the lower step can use sensor of key equipment (temperature on-line monitoring device, circuit breaker online monitoring device, lightning arrester on-line monitoring, let equipment on-line monitoring) operating conditions were realtime monitoring, and then the data obtained through the network system to collect, integration, finally, through the analysis of the data, mining, to achieve the optimal management of the whole power system. References [1] Liuying, Hanyong, GPRS less residential district electric power centralized meter reading system. Automation technology and Application, vol.29, 2010, pp [2] Zhanginghua, Z haogang, Sunjianming, Research and application of GPRS less service Computer and information technology,vol.7, 2008, pp [3] Huanghanqing, angke, Zhangke, Application of GPRS remote measurement and control system in County distribution network management.rural Electrician,vol.1, 2012, pp [4] Jiangchaoyuan, Caoxiaoli, M-BUS bus technology and its application in automatic meter reading. Journal of Industrial and Commercial University Of Chongqing: atural Science Edition,vol.22, 2012, pp [5] Liuhuan, Wangguangsen, Application analysis and Simulation of OFDM and spread spectrum communication technology in power line communication. Electric Relay, vol.7, 2010, pp [6] Xuwei. Design of cell meter reading system based on short distance less communication and GPRS communication. Instrument technology, vol.3, 2009, pp [7] Zhanghuaiqiang, Zhoutong, Lukun,heweimin, Electric bicycle design speed and odometer and photoelectric sensor based on MCU. Electronics today,vol.7, 2009, pp [8] Dr John ew bury. Communication Requirements and Standards for Low Voltage Mains Signallin. IEEE Transaction on Power Delivery, vol.13, 2008, pp [9] aozhangsai, Ru Jian Ma, Design of Wireless Automatic Meter Reading System.Advanced Materials Research, vol , 2011, pp [10] ChenShengZheng, Remote Power Automatic Meter Reading System Based on GPRS [J].Applied Mechanics and Materials, vol.63-64, 2011, pp