The application of the GPRS remote meter reading system The method of knocking on the door to check the meter is a troublesome thing for people who knock on the door or for people knocked on the door. Many residential users now have prepaid cards, eliminating the need for checklists, but for the power sector, data statistics and real-time monitoring are still a problem to be solved.
I. Solution introduction Through China Mobile’s GPRS network system, the power sector can transmit power system data collected by industrial and civilian electricity meters to the centralized monitoring centers at the local, municipal, and provincial levels in real time to achieve unified monitoring and distribution of power monitoring equipment. Management. The GPRS network can provide a simple and efficient communication transmission method for the power system. (Also called smart meter reading or carrier reading.)
China Mobile GPRS system can provide wide area wireless IP connection. Constructing a remote meter reading system on a mobile communication company's GPRS service platform to achieve wireless data transmission of meter data has the advantages of making full use of existing networks, shortening the construction period, and reducing construction costs. Moreover, the equipment is easy to install and maintain.
The GPRS remote meter reading system consists of a power distribution center located in the Power Bureau and an electric meter data collection point located in a residential area. Using China Mobile's existing GPRS/GSM network, meter data is transmitted through China Mobile's GPRS/GSM network.
All residential meters in the residential area are first connected to the meter concentrator. The electricity data of the residential users is transmitted from the multi-rate meter to the meter concentrator via the 485. The meter concentrator is connected to the GPRS transparent data transmission terminal through the RS232 port. The meter data is encapsulated by the protocol. After being sent to China Mobile's GPRS data network, the data is transmitted to the distribution data center through the GPRS data network, realizing the real-time online connection of the meter data and data center system.
Second, the program advantages GPRS wireless power remote meter reading system has the following characteristics:
1, real-time strong:
Because GPRS has real-time online characteristics, the system has no delay, and it can synchronously receive and process data of multiple/all data collection points without round robin inspection. It can meet the requirements of the system for real-time data collection and transmission.
2, can be remotely controlled on the meter device:
Through the GPRS two-way system, remote control of the meter device can also be realized, and parameter control, switch, and other control operations can be implemented to achieve intelligent meter reading.
3, the construction cost is low:
Due to the adoption of the GPRS wireless public network platform, it is only necessary to install the equipment. There is no need for special wiring for remote meter reading. The early stage investment is less, and the quicker results are obtained. The late upgrade and maintenance cost are low.
4, a wide range of copying:
The GPRS covers a wide range of areas. Within the coverage of the wireless GSM/GPRS network, it is possible to complete the control and management of centralized copying. Moreover, there is no limit to capacity expansion, and there are no restrictions on access locations, which can meet the access needs of mountainous regions, townships, and regions.
5, the system's transmission capacity:
The distribution data center must maintain real-time connection with each meter data collection point. Due to the large number of meter data collection points, the system needs to meet the need for bursty data transmission, and the GPRS technology can well meet the needs of transmitting bursty data.
6, high data transfer rate:
Each data acquisition point of each meter is within 10 Kbps. The GPRS network transmission rate can theoretically reach 171.2 kbit/s. At present, the actual data transmission rate of GPRS is about 40 Kbps, which fully meets the requirements of the system data transmission rate (≥10 Kbps).
7. Low communication costs: Monthly billing is adopted, and the operating cost is low.
Third, system construction Because GPRS communication is based on the IP address of the data packet communication network, the distribution center computer host configures a fixed IP address, and each of the meter data collection points uses the GPRS module to communicate with the host.
(I) System composition 1. Meter data collection point:
The meter data collection point is located in the information center of the residential area. The electricity consumption data of the residential user is firstly connected to the meter concentrator located in the community information center through the RS485 interface through the twisted-pair cable. The meter concentrator passes the RS232 interface and GPRS. Transparent data transmission terminals are connected. Through GPRS transparent data transmission terminal built-in embedded processor for data processing, protocol package sent to the GPRS network, through the GPRS network to the power company data center power remote meter reading system, to achieve real-time online data meter and data center system connection .
The meter concentrator is directly connected to the meter through an RS485 interface. It can support a single meter or multiple meters at the same time. It can realize the collection, storage, pretreatment of the meter parameters or transmit the collected meter data to the distribution in real time. At the same time, the meter concentrator can also transmit the remote command sent by the distribution center to the meter control module to control the meter.
2, distribution center.
The distribution center server applies to configure a fixed IP address and uses the DDN dedicated line provided by the provincial mobile communications company to connect to the GPRS network. Because the DDN dedicated line can provide higher bandwidth, when the number of meter data collection points increases, the center can meet the demand without expansion. The central server runs the GPRS server software, delivers the instructions for meter reading, and receives the data returned from the terminal. Then it is transmitted to the host computer of the distribution center, and the data is restored and displayed through the system software, and the data is processed and recorded into the database.
The distribution center computer host can perform service management and billing management, check, calculate, store, analyze, and manage the power data. It can provide alarms for abnormal conditions, monitor users' real-time conditions in real time, and ensure the power station's legality. income.
Meter reading host of distribution center. If the meter reading software is based on the serial port, it can be equipped with another KB2000-A. KB2000-A is a conversion device from the heart serial port to the TCP/IP. It can send the serial port command of the meter reading software to the server program on the fixed IP server through the serial port. , and then forwarded to the corresponding KB3000 site. This allows real-time data acquisition. If the meter reading software is based on TCP/IP, it can be connected directly to the server software without using the KB2000-A.
The user can also use any host as a meter reading host. As long as the user's meter reading software is based on the serial port, connect to KB2000-A and connect to the Internet to realize meter reading anywhere. This situation is mainly adapted to the user's real-time monitoring of the site, real-time viewing, no need for electricity statistics analysis and so on.
3, GPRS/GSM mobile data transmission network:
The data collected by the meter concentrator is decoded and processed by the air interface function module of the GPRS network at the same time, converted into the format of data transmission in the public network, and transmitted through the GPRS wireless data network of China Mobile, and finally transmitted to the IP address of the distribution center.
Since GPRS communication is a data packet communication network based on IP address, the distribution center computer host configures a fixed IP address, and each meter data collection point uses a GPRS module to communicate with the host.
(II) System solutions Each meter uses GPRS transparent data transmission terminals and is connected to the distribution center through a mobile GPRS network.
The utility meter uses the STK card unified by the mobile communication company. At the same time, the distribution center registers the data collection points of each meter and saves relevant data for identification and maintenance. The operating system software of each meter data collection point supports 24-hour real-time online and realizes that the information collection point transmits the collected meter data in 24 hours.
The system can be used for any information collection point authorized by the Electric Power Bureau:
1. The mobile data collection point must use the mobile unified STK card. Users can use this card only for the data communication function with the distribution center.
2. The wireless communication terminal equipment uses the GPRS mobile data communication terminal provided by Jinbotong Technology.
3, the user registration: in line with the provisions of the power bureau.
It is recommended that provincial distribution centers use VPNs to access the mobile GPRS network through the public network. This method has a lower cost, higher security, and guarantees both speed and network service quality; it can also be accessed through the GPRS private line to the mobile GPRS network. This method is costly, safe, stable and reliable.
Since GPRS communication is a data packet communication network based on IP address, the distribution center computer host configures a fixed IP address, and each meter data collection point uses a GPRS module to communicate with the host.
(III) Product Features The system adopts KB3000 series GPRS wireless transparent data transmission terminals. Products based on China Mobile's GPRS network, with high-performance, high reliability and strong anti-jamming capabilities, providing a standard 232 data port can be directly connected to computers, RTU, PLC, GPS receivers, digital cameras, data terminals, etc., transmission rate Up to 171Kbps, with remote diagnostics, testing, and supervision capabilities, to meet the data acquisition and control between various industry dispatch or control centers and many remote stations.
1, support 900/1800MHz dual-band GSM/GPRS.
2. Interface: RS232, RS485.
3, the system theoretical transmission rate of 171Kbps, the actual transmission rate of 40Kbps.
4, support for Windows95/98/2000/XP, LINUX operating system.
5, support transparent data transmission and protocol conversion.
6, support VPN security features.
7, flexible installation, easy to use and reliable.
(IV) Safety Measures Due to the particularity of the remote meter reading system for electric power, this system requires extremely high system security and stability. Security protection is mainly to prevent intentional and unintentional damage from inside and outside the system. Stability means that the system can run 24/7 without interruption. Even if hardware and software failures occur, the system cannot be interrupted.
1. APN private network mode: By using the uniqueness of the SIM card, it can delimit users' access to a certain system, which can effectively prevent illegal intrusion. A dedicated APN allocated by China Mobile is used for wireless network access. The SIM card and the APN are bound on the network side. Only the SIM cards belonging to the designated industry can access the dedicated APN. GPRS terminals with ordinary mobile phone numbers cannot call dedicated APNs.
2. For a specific user, a specific user ID and password can be assigned to each mobile terminal through the data center. Other mobile terminals that do not have the user ID and password assigned by the data center cannot log into the system, and the security of the system is further enhanced.
3. Secure firewall filtering and set up firewall software security system security.
IV. Conclusions For the power sector, meter reading by remote substations has always been a headache. It requires a lot of manpower, material resources and financial resources. Because of the large number of substations and geographically dispersed locations, it has caused great inconvenience to the staff. The power company can also use the GPRS mobile data network to monitor all important power nodes, automatically read and analyze relevant data, and further carry out remote control or equipment maintenance, which can reduce human resources, shorten repair time, and save special line construction costs. .
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