CN102903221B - Distribution transformer terminal wireless data transmission system for communication signal blind areas - Google Patents

Abstract

The invention discloses a distribution transformer terminal wireless data transmission system for communication signal blind areas, including a data acquisition module for electricity monitoring and metering, which is composed of distribution transformer terminal equipment; a GPRS/CDMA communication module for network communication; And a wireless data transmission module for wireless communication between the distribution transformer terminal equipment and the GPRS/CDMA communication module, the wireless data transmission module includes a TM module connected to the distribution transformer terminal equipment and a GM module connected to the GPRS/CDMA communication module module. The wireless data transmission system of the present invention adopts the combination of wireless data transmission and GPRS/CDMA wireless communication network, eliminates the problem of signal blind spots in network communication, and meets the requirements of data communication of distribution transformer terminal equipment.

Description

Distribution transformer terminal wireless data transmission system for communication signal blind area

technical field

The invention relates to a data transmission system, in particular to a wireless data transmission system applied to distribution transformer terminals working in the blind area of mobile communication signals.

Background technique

The smart grid is to combine the latest information technology, communication technology, computer control technology with the original transmission and distribution infrastructure to form a new type of power grid and realize the intelligence of the power system. Establishing a high-speed, two-way, real-time, and integrated communication system is the basis for realizing the smart grid, and building a communication network that can comprehensively monitor and measure various operating parameters of distribution transformers is the foundation of smart grid construction. At present, the communication network system for monitoring and measuring various operating parameters of distribution transformers mainly uses GPRS/CDMA wireless communication network for data transmission.

GPRS is the English abbreviation for General Packet Wireless Service, and CDMA is the English abbreviation for Code Division Multiple Access. Referring to Figure 1, most distribution transformer terminal equipment currently provide communication methods based on GPRS/CDMA to realize the operating parameters of distribution transformers. Monitor and measure. As a mature transmission network, GPRS/CDMA wireless communication network has the characteristics of high transmission rate, high frequency utilization rate and reliable data transmission, which can meet the data communication requirements of distribution transformer terminal equipment. At the same time, because the annual usage fee of each distribution transformer terminal equipment is only about 100 yuan, it is currently the most commonly used wireless communication method for most data acquisition and monitoring equipment.

However, there are some limitations in the GPRS/CDMA communication method. This method can only be used in areas with network signals, otherwise the distribution terminal equipment with GPRS/CDMA communication module will not work normally.

Contents of the invention

In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a wireless data transmission system for distribution transformer terminals that works in the blind area of mobile communication signals.

The technical solution adopted by the present invention to solve its technical problems is:

Distribution transformer terminal wireless data transmission system for communication signal blind area, including distribution transformer terminal equipment for electricity monitoring and metering; GPRS/CDMA communication module for network communication; used for distribution transformer terminal equipment and GPRS/CDMA A wireless data transmission module for wireless communication between communication modules, the wireless data transmission module includes a TM module connected to the distribution transformer terminal equipment and a GM module connected to the GPRS/CDMA communication module.

Preferably, the TM module is composed of a terminal interface circuit for connecting with distribution transformer terminal equipment, a serial communication circuit I, a microprocessor I, a watchdog and reset circuit I, a wireless radio frequency circuit I and a power supply for converting voltage The circuit I is composed of the terminal interface circuit, the serial port communication circuit I and the radio frequency circuit I respectively connected to the microprocessor I, and the watchdog and reset circuit I connected to the microprocessor I for resetting the microprocessor I.

Further, the terminal interface circuit is provided with a power line and a data line connected to the terminal equipment of the distribution transformer, the power supply circuit I is connected to the terminal interface circuit, and the TM module is connected to the terminal equipment of the distribution transformer through the terminal interface circuit, and can be connected from the distribution transformer The terminal equipment obtains the power supply, and converts it into the working voltage of each component on the TM module through the power supply circuit I.

Preferably, the GM module is composed of a communication module interface circuit for connecting with a GPRS/CDMA communication module, a serial port communication circuit II, a microprocessor II, a watchdog and reset circuit II, a wireless radio frequency circuit II and a circuit for converting voltage The power supply circuit II is composed of the communication module interface circuit, serial port communication circuit II and radio frequency circuit II respectively connected to the microprocessor II, and the watchdog and reset circuit II are connected to the microprocessor II for the microprocessor II reset.

Further, the power supply circuit II is connected to the GPRS/CDMA communication module and provides working power for the GPRS/CDMA communication module.

Further, the GM module also includes a solar battery, the solar battery is connected to the power circuit II, and the electricity output by the solar battery is converted into a voltage by the power circuit II to provide working power for each circuit of the GM module.

The beneficial effects of the present invention are: the wireless data transmission system of the present invention adopts the mode of combining wireless data transmission and GPRS/CDMA wireless communication network, adopts wireless data transmission module to carry out short-distance communication at the blind spot of communication signal of GPRS/CDMA wireless communication network Data transmission, and then long-distance data transmission through the GPRS/CDMA wireless communication network, which overcomes the shortcomings of the GPRS/CDMA wireless communication network with communication blind spots. The wireless data transmission system of the present invention has the characteristics of high transmission rate, high frequency utilization rate, reliable data transmission, low cost, low maintenance cost, etc., and at the same time eliminates the problem of signal blind spots in network communication, and meets the data communication requirements of distribution transformer terminal equipment , suitable for power supply bureaus to monitor and measure power consumption of distribution transformers.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1 is a working schematic diagram of the existing distribution transformer terminal equipment based on GPRS/CDMA communication mode;

Fig. 2 is a schematic structural diagram of the wireless data transmission system of the present invention;

Fig. 3 is the structural block diagram of TM module among the present invention;

Fig. 4 is the structural block diagram of GM module among the present invention;

Figure 5 is a workflow diagram of the TM (GM) module;

Figure 6 is a flow chart of TM (GM) module wireless reception interruption;

Figure 7 is a flow chart of TM (GM) module serial port receiving interrupt.

Explanation of symbols in the figure: 1. Distribution transformer terminal equipment, 2. Wireless data transmission module, 3. TM module, 31. Terminal interface circuit, 32. Serial port communication circuit Ⅰ, 33. Microprocessor Ⅰ, 34. Watchdog and Reset circuit Ⅰ, 35. Wireless radio frequency circuit Ⅰ, 36. Power circuit Ⅰ, 4. GM module, 41. Communication module interface circuit, 42. Serial port communication circuit Ⅱ, 43. Microprocessor Ⅱ, 44. Watchdog and reset Circuit II, 45. Radio frequency circuit II, 46. Power circuit II, 47. Solar battery, 5. GPRS/CDMA communication module, 6. Information control center.

Detailed ways

Referring to Fig. 2, a distribution transformer terminal wireless data transmission system for communication signal blind areas provided by the present invention includes a distribution transformer terminal device 1 for power consumption monitoring and metering, and the distribution transformer terminal device 1 transmits data through wireless The module 2 is connected with the GPRS/CDMA communication module 5, and the GPRS/CDMA communication module 5 is used for network communication with the information control center 6 of the power supply bureau.

The wireless data transmission module 2 includes a TM module 3 connected to the distribution transformer terminal equipment 1 and a GM module 4 connected to the GPRS/CDMA communication module 5 .

Referring to Fig. 3, TM module 3 is made up of terminal interface circuit 31, serial port communication circuit I32, microprocessor I33, watchdog and reset circuit I34, wireless radio frequency circuit I35 and power supply circuit I36, and the terminal interface circuit 31, serial port The communication circuit I32, the watchdog and reset circuit I34 and the wireless radio frequency circuit I35 are respectively connected with the microprocessor I33. Among them, the terminal interface circuit 31 is used to directly connect with the distribution transformer terminal equipment 1, so as to receive the level signals and data packets sent by the distribution transformer terminal equipment 1 in real time, and transmit these signals and data packets to the microprocessor I33. The terminal interface circuit 31 will also transmit the level signal and data packet sent by the microprocessor I33 to the distribution transformer terminal equipment 1 . The microprocessor I33 encodes the level signal and data packet sent by the terminal interface circuit 31 to the wireless radio frequency unit I35, and can also decode the data signal sent by the wireless radio frequency unit I35 to the terminal interface circuit 31. The wireless radio frequency unit I35 transmits the coded signal sent by the microprocessor I33 through the antenna, and can also receive the wireless signal sent by the GM module 4 and send it to the microprocessor I33. The serial port communication circuit I32 is used to connect with the RS232 serial port circuit of the PC, so as to load the program to the microprocessor I33. The watchdog and reset circuit I34 is used to reset the microprocessor I33 when it is powered on, and reset when the TM module 3 cannot work normally, so that the TM module 3 can return to the normal working state. The terminal interface circuit 31 is provided with a power line and a data line connected to the distribution transformer terminal equipment 1. After the TM module 3 is connected to the distribution transformer terminal equipment 1 through the terminal interface circuit 31, the power supply circuit I36 transmits the 5V voltage from the terminal interface circuit 31. The power supply is converted into a 3.3V power supply for the components on the TM module 3 to work.

Referring to Fig. 4, GM module 4 is made up of communication module interface circuit 41, serial port communication circuit II 42, microprocessor II 43, watchdog and reset circuit II 44, wireless radio frequency circuit II 45, power supply circuit II 46 and solar cell 47, said communication module Interface circuit 41 , serial port communication circuit II42 , watchdog and reset circuit II44 and wireless radio frequency circuit II45 are respectively connected to microprocessor II43 , and the solar battery 47 is connected to power supply circuit II46 . Wherein, the communication module interface circuit 41 is used to be directly connected with the GPRS/CDMA communication module 5, and after obtaining the level signal and the data packet from the GPRS/CDMA communication module 5, transmits it to the microprocessor II 43, and is also responsible for passing the microprocessor II 43 over The level signal and data packet are sent to GPRS/CDMA communication module 5. The power circuit II 46 obtains power from the solar cell 47, and converts it into a 3.3V voltage for the components on the GM module 4 to work. Preferably, the storage battery specification in the solar cell 47 is 12V 50AH, and the solar cell panel is 40W 12V. Can guarantee to work normally when there is no sunlight for 15 consecutive days; further, the power circuit II 46 is also connected to the GPRS/CDMA communication module 5, and the power circuit II 46 provides working power for the GPRS/CDMA communication module 5, and the serial port communication circuit II 42 on the GM module 4, The functions of microprocessor II 43 , watchdog and reset circuit II 44 and wireless radio frequency circuit II 45 are the same as those of the corresponding circuits on TM module 3 .

Preferably, the working frequency of the wireless radio frequency circuits 35 and 45 in the TM module 3 and the GM module 4 is 2.4GHz. The data transmission power of the wireless radio frequency circuits 35 and 45 is adjustable, and the maximum transmission rate is 250Kbps.

Preferably, the microprocessors 33 and 43 adopted in the TM module 3 and the GM module 4 have characteristics such as low power, low cost, and full compatibility with IEEE802.15.4, and integrate 32-bit RISC MCU cores, high-performance 2.4GHz IEEE802.15.4 RF transceiver, 192kB ROM and 96kB RAM, and provides a general low-cost solution for wireless sensor network applications. High integration helps to reduce the cost of the entire system, especially the 192K ROM memory can realize the point-to-point and mesh network protocol stack, and the integrated RAM can support routing algorithms and application control functions without adding additional external storage. Using hardware MAC and AES encoding accelerator with high security greatly reduces power consumption and processor cost.

Preferably, the distribution transformer terminal equipment 1 adopts Huali HL3302 distribution transformer management terminal, and the GPRS/CDMA communication module 5 is B010 based on Youfang Neo_M590 communication module.

The work process of the present invention is: the information control center 6 of the power supply department sends an order to be placed on the GPRS/CDMA communication module 5 in the mobile communication signal area through the network, and the GPRS/CDMA communication module 5 obtains the instruction by means of the connected GM module 4 , transmit the command to the TM module 3 in the blind area of the mobile communication signal, and the TM module 3 transmits the command to the connected distribution transformer terminal device 1, and the distribution transformer terminal device 1 parses out the relevant command according to the agreement, and then responds to the command, for example For parameter setting or for electricity monitoring and metering. The process of data collection is: the distribution transformer terminal equipment 1 placed in the mobile communication signal blind area collects relevant equipment data according to the preset settings, and transmits the data to the mobile communication signal area with the help of the TM module 3 connected to it. GM module 4, after GM module 4 obtains data, data is sent to the GPRS/CDMA communication module 5 that is connected with it, after GPRS/CDMA communication module 5 obtains data, data is sent back in the information control center 6 of power supply department through network. 5 to 7 are flowcharts of the working process of the TM module 3 and the GM module 4 .

The present invention realizes the separation of the GPRS/CDMA communication module 5 and the distribution transformer terminal equipment 1 in spatial position through the wireless transmission of level signals and data packets between the distribution transformer terminal equipment 1 and the GPRS/CDMA communication module 5, while ensuring The accuracy of the mutual transmission of data and level signals, so the GPRS/CDMA communication module 5 and the GM module 4 can be placed together in the position where there are GPRS signals or CDMA signals, thereby solving the problem of no mobile communication at the terminal equipment 1 of the distribution transformer. In the case of signals, the system can still realize remote data transmission by means of the present invention.

The wireless data transmission system of the present invention adopts the mode that wireless data transmission combines with GPRS/CDMA wireless communication network, adopts wireless data transmission module 2 to carry out short-distance data transmission at the communication signal blind spot of GPRS/CDMA wireless communication network, and then passes The GPRS/CDMA wireless communication network carries out long-distance data transmission, which overcomes the shortcomings that the GPRS/CDMA wireless communication network cannot adapt to the blind area of communication signals. The wireless data transmission system of the present invention has the characteristics of high transmission rate, high frequency utilization rate, reliable data transmission, low cost, and low maintenance cost. It is applicable to the monitoring and measurement of various operating parameters of distribution transformers by the power supply bureau.

The above is only the preferred implementation of the present invention, and the present invention is not limited to the above-described embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (4)

1. The wireless data transmission system of the distribution transformer terminal used in the communication signal blind area, including:  Distribution transformer terminal equipment (1) for electricity monitoring and metering; GPRS/CDMA communication module (5) for network communication; It is characterized in that it also includes a wireless data transmission module (2) for wireless communication between the distribution transformer terminal equipment (1) and the GPRS/CDMA communication module (5), and the wireless data transmission module (2) includes a The TM module (3) connected to the terminal equipment (1) and the GM module (4) connected to the GPRS/CDMA communication module (5); The TM module (3) consists of a terminal interface circuit (31), a serial communication circuit I (32), a microprocessor I (33), a watchdog and a reset circuit I for connecting with the distribution transformer terminal equipment (1) (34), wireless radio frequency circuit I (35) and power supply circuit I (36) for converting voltage, the terminal interface circuit (31), serial port communication circuit I (32) and wireless radio frequency circuit I (35) respectively It is connected with the microprocessor I (33), and the watchdog and reset circuit I (34) is connected with the microprocessor I (33) for reset of the microprocessor I (33); The GM module (4) is composed of a communication module interface circuit (41) for connecting with the GPRS/CDMA communication module (5), a serial port communication circuit II (42), a microprocessor II (43), a watchdog and a reset Circuit II (44), wireless radio frequency circuit II (45) and power supply circuit II (46) for converting voltage, the communication module interface circuit (41), serial port communication circuit II (42) and wireless radio frequency circuit II ( 45) are respectively connected to the microprocessor II (43), and the watchdog and reset circuit II (44) is connected to the microprocessor II (43) for resetting the microprocessor II (43). 2. The distribution transformer terminal wireless data transmission system for communication signal blind area according to claim 1, characterized in that: the terminal interface circuit (31) is provided with a power line connected to the distribution transformer terminal equipment (1) and As for the data line, the power circuit I (36) is connected to the terminal interface circuit (31). 3. The distribution transformer terminal wireless data transmission system for communication signal blind area according to claim 1, characterized in that: the power circuit II (46) is connected to the GPRS/CDMA communication module (5) and is used for GPRS/CDMA communication Module (5) provides working power. 4. The distribution transformer terminal wireless data transmission system for communication signal blind area according to claim 1, characterized in that: the GM module (4) also includes a solar cell (47), and the solar cell (47) is connected to Power Circuit II (46).