CN104483541A - GPRS (General Packet Radio Service) electric power acquisition system - Google Patents
GPRS (General Packet Radio Service) electric power acquisition system Download PDFInfo
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Abstract
The invention relates to a GPRS (General Packet Radio Service) electric power acquisition system, which relates to an electric power acquisition system. The system data are transmitted through adopting two modes of a GPRS module wireless transmission mode or an RS-485 module bus manner; a CPU (Central Processing Unit) module is connected with an 8 digital input 2 digital output (8DI/2DO) module and an electric power acquisition unit in both directions; the CPU module is connected with a 485 communication interface module by one serial port, and is connected with a GPRS module by the other serial port; voltage and current in the electric energy acquisition unit are accessed in a star load way, the current of 5A is input, and the currents of a phase A, a phase B, a phase C and a zero line are acquired and are converted through a current transformer. The system adopts the advanced wireless GPRS communication technology, the existing mobile communication network can be fully utilized to carry out wireless communication, the requirement on site conditions is low, and only equipment needs to be installed on an acquisition point, so that not only is the project construction period shortened, but also the project investment cost is reduced.
Description
Technical field
the present invention relates to a kind of coulomb collection system, particularly relate to a kind of GPRS coulomb collection system.
Background technology
Traditional electric quantity acquisition equipment is installed needs a large amount of human and material resources to carry out site operation, uses a large amount of cables to be connected with main frame by individual communication apparatus, and indivedual place can't realize and host communication because field condition does not possess.No matter in severe field environment or in city, electric substation's distribution is wide, quantity is many, and not only working strength is large to adopt the mode of manual metering, and labor intensive resource is many, too increases a lot of hazards and the inaccurate factor of artificial data.
Also there are some to check meter preferably now, such as, use RS-232, the data retransmission technology that RS-485 stipulations are carried out; The modes such as hand-held meter reading instrument.The artificial mode of many uses can also be adopted to carry out for metropolitan environments, but certain difficulty is existed for rural area and the field environment such as factory or colliery.
Study a system that can improve for above problem, increase easness, the accuracy of data acquisition, reduce waste of human resource and be extremely necessary.
Summary of the invention
The object of the present invention is to provide a kind of GPRS coulomb collection system, this system adopts advanced wireless GPRS mechanics of communication, existing mobile communication network can be made full use of, carry out wireless telecommunications, require low to field condition, only equipment need be installed to collection point, namely this shorten the project construction cycle, again reduces project investment cost.
The object of the invention is to be achieved through the following technical solutions:
A kind of GPRS coulomb collection system, the main modular comprising system comprises CPU element, electric quantity acquisition unit, data storage cell, 8 digital quantities input 2 digital outputs, power module, a RS-485 communication interface and a GPRS wave point.The transmission of data can adopt GPRS module wireless transmission or RS-485 module bus mode two kinds of patterns.
CPU adopts AT91SAM7S256, and its inside is integrated with abundant peripheral interface, can meet the interface requirement between each unit, extends out data storage cell (Data Flash) module and is used for storing long term data, extend out FRAM and store power failure data.CPU module is two-way inputs 2 digital output (8DI/2DO) modules with 8 digital quantities, and electric quantity acquisition unit is connected; Be connected with 485 communication interface modules by a serial port, be connected with GPRS module by another serial port.It is system power supply that power module adopts alternating current 220V to turn 5V, then is the power supplies such as CPU module through the 3.3V that DC/DC conversion produces; The 4V produced is that GPRS module is powered; The 12V produced is DI/DO module for power supply; Electric quantity acquisition chip is powered by 5V.Power supply monitoring module be used for 5V power supply power-fail time, still keep 3.3V power supply certain hour, make CPU preserve data in FRAM, power down holding time >=10ms.DI/DO module provides the 8 passive passive node On-off signal in tunnel, No. 2 relay isolation and amplifier.
In electric quantity acquisition unit, electric current and voltage accesses in the mode of star load, and voltage input 100V, adopts voltage transformer (VT) to carry out transformation.Electric current input 5A, gathers the electric current of A, B, C three-phase and zero line, carries out current transformation through current transformer.Electric current and voltage changes into Differential Input to special electric energy chip ATT7022B after conversion.ATT7022B inside is integrated with 7 road ADC, can measure every and and the active power of phase and reactive power, applied power, meritorious energy and quadergy; Each phase voltage, current effective value can also be measured, power factor and phase angle, frequency etc.ATT7022B provides SPI interface to be connected with CPU.Because ATT7022B is+5V logic, CPU is+3.3V logic, so need to carry out level conversion.ATT7022B provides 4 tunnel pulse CF1-CF4 to export, and can be used for calibration.
GPRS module adopts SIM300C, the embedded ICP/IP protocol stack of this module.Simplify the design of system software.SIM300C, with standard asynchronous serial port, can adopt AT Command Set to control.In actual applications, when needs carry out communication by serial ports and module, can only with three pins, i.e. RXD, TXD, GND, other pins are unsettled; But when needs are surfed the Net by module, whole rs 232 serial interface signal pins should be used as far as possible.Because the inner serial ports 1 of AT91SAM7S256 supports modem feature in the design, there are the whole rs 232 serial interface signals multiplexing with I/O, therefore, the two one_to_one corresponding is connected.Because GPRS module is 2.8V logic level, need when being connected with CPU to carry out level conversion.Meanwhile, SIM300C is adopted to carry RTC as system's real-time clock.
Acquisition system software is calculated by timer module, communication management module, system cloud gray model administration module, GPRS communication module, the communication based on RS-485 interface MODBUS agreement, data acquisition, data analysis statistical, Data Storage.
Original Single Chip Microcomputer (SCM) program is transplanted to NUCLEUS operating system, under the original each merit can completely prerequisite of maintenance, running software is obtained more smooth; In system, need the initialization of the system that realizes, the timing acquiring of data, timing calculates, and timing stores; Communication part system need to realize timing data are sent to server by GPRS or MODBUS agreement and accept server initiatively call information; System administrative section then requires the setting that can accept systematic parameter, to the storage administration that Flash carries out, and the recovery of system disaster, the function of power down process.
In GPRS communication module, module initialization is namely to setting GPRS communication module being carried out to communications parameter, when there being data to send, first connects, and Successful login.When communication data receives in each network communication task, receive the data of specifying and connecting, and data are unpacked and resolves.The data of having packed are sent to remote server by GPRS module when sending by communication data.The package to communication data or deblocking can be realized.When the process prediction scheme in Network Abnormal situation in the process in communication.Check numbers when remote server dials the number of collection terminal and judge, if number is correct, collection terminal disconnects to be connected, and prepares to connect with server.Otherwise what does not do.To short message be received if there is the number arranging licensing function, then resolution data go forward side by side line parameter arrange and deleting short message.Otherwise do nothing.
Complete the initial work that MODBUS is relevant in RS-485 MODBUS module, accept the request of data requirement of primary server.Remote server is sent the data to by MODBUS agreement.The data that will send unpack according to MODBUS agreement according to MODBUS protocol format carry out the packing data that will receive.
Communication management module can identify that namely communication modes may be connected to RS-485modbus equipment to system and also be connected to GPRS equipment simultaneously in the process used.Communication management module is used for identifying and adopts which kind of mode to carry out communication.When amendment appears in systematic parameter, parameter is passed to system management module, makes it systematic parameter be upgraded.
System cloud gray model administration module startup in from flash the environmental parameter of reading system arrange.Receive from the parameter setting information of communication module, and current environment be configured to the parameter of coming in when front transfer and call the configuration parameter of the interface storage system of storage administration.
Data Storage stores 24 hour datas and namely all will call this administration module to store the data per hour of hour of just having pass by data acquisition equipment per hour.Supported data partition holding.The statistics of every day can be stored.If day, statistics was more than 95 days, delete the data of that day the earliest.Namely digital independent function receives the time of data, returns relevant total data.
Timer module can periodically be sampled to data.Within 1 minute, call statistical computation module to calculate real time data.When constantly little to 1, gather a secondary data, and call memory management module hour data is stored.After completing to the data acquisition of 1 day, call statistical module counts whole day data, and call memory management module storage.
Data analysis statistical computing module tries to achieve the statistical value of real time data and data on the one.Analyze the data collected whether to transfinite, or maximal value changes, or stop electrical data.If need the event of record then to call memory management module carry out data preservation.
The data collected, by SPI interface, are carried out preprocessing, the versatility used after guarantee by the electric quantity data at data collecting module collected scene.
Principle of work of the present invention is: power module switches on power, and is other each module for power supply.Three-phase four-wire system/tri-signal that three-wire system measure voltage & current arrives is adopted in electric quantity acquisition unit, after voltage transformation and current transformation, change into Differential Input carry out primary Calculation to special electric energy chip ATT7022B to data, ATT7022B provides SPI interface to be stored in data storage Data Flash memory module by inputing to CPU after level conversion.System may be connected to RS-485modbus equipment and also be connected to GPRS equipment simultaneously in the process used.CPU communication management module identifies and adopts which kind of mode to carry out communication.CPU timing or according to request, the data of preservation are sent by RS-485, or open SIM300C, data are sent by SIM card through SIM300C after level conversion.ATT7022B provides 4 tunnel pulse CF1-CF4 to export, and can be used for calibration.
Accompanying drawing explanation
Fig. 1 is hardware system module structural representation of the present invention;
Fig. 2 is the basic logic relation of each intermodule in software systems of the present invention and the interface diagram with other softwares outside.
Embodiment
Embodiment:
Below in conjunction with embodiment Fig. 1, Fig. 2, the present invention is described in further detail.
A kind of GPRS coulomb collection system, the main modular comprising system comprises CPU element 10, electric quantity acquisition unit 60, data storage cell 30,8 digital quantities input 2 digital outputs 40, power module 201, RS-485 communication interface 50 and a GPRS module 70.The transmission of data can adopt GPRS module 70 wireless transmission or RS-485 module 50 bus mode two kinds of patterns.
CPU10 adopts AT91SAM7S256, and its inside is integrated with abundant peripheral interface, can meet the interface requirement between each unit, extends out data storage cell (Data Flash301) module and is used for storing long term data, extend out FRAM302 and store power failure data.CPU module 10 is two-way inputs 2 digital output (8DI/2DO) 40 modules with 8 digital quantities, and electric quantity acquisition unit 60 is connected; Be connected with 485 communication interface modules 50 by a serial port, be connected with GPRS module 70 by another serial port.It is system power supply that power module 201 adopts alternating current 220V to turn 5V, then is the power supplies such as CPU module 10 through the 3.3V that DC/DC conversion produces; The 4V produced is that GPRS module 70 is powered; The 12V produced is that DI/DO module 40 is powered; Electric quantity acquisition chip 603 is powered by 5V.When power supply monitoring module 202 is for 5V power supply power-fail, still keep 3.3V power supply certain hour, make CPU preserve data in FRAM302, power down holding time >=10ms.DI/DO module 40 provides the 8 passive passive node On-off signal in tunnel, No. 2 relay isolation and amplifier.
In electric quantity acquisition unit 60, electric current and voltage accesses in the mode of star load, and voltage input 100V, adopts voltage transformer (VT) 601 to carry out transformation.Electric current input 5A, gathers the electric current of A, B, C three-phase and zero line, carries out current transformation through current transformer 602.Electric current and voltage changes into Differential Input to special electric energy chip ATT7022B 603 after conversion.ATT7022B 603 inside is integrated with 7 road ADC, can measure every and and the active power of phase and reactive power, applied power, meritorious energy and quadergy; Each phase voltage, current effective value can also be measured, power factor and phase angle, frequency etc.ATT7022B 603 provides SPI interface 605 to be connected with CPU10.Because ATT7022B 603 is+5V logic, CPU10 is+3.3V logic, so need to carry out level conversion 606.ATT7022B 603 provides 4 tunnel pulse CF1-CF4 604 to export, and can be used for calibration.
GPRS module 70 adopts SIM300C 701, the embedded ICP/IP protocol stack of this module.Simplify the design of system software.SIM300C 701, with standard asynchronous serial port, can adopt AT Command Set to control.In actual applications, when needs carry out communication by serial ports and module, can only with three pins, i.e. RXD, TXD, GND, other pins are unsettled; But when needs are surfed the Net by module, whole rs 232 serial interface signal pins should be used as far as possible.Because the inner serial ports 1 of AT91SAM7S256CPU 10 supports modem feature in the design, there are the whole rs 232 serial interface signals multiplexing with I/O, therefore, the two one_to_one corresponding is connected.Because GPRS module 70 is 2.8V logic level, need when being connected with CPU10 to carry out level conversion 702.Meanwhile, SIM300C 701 is adopted to carry RTC as system's real-time clock.
Fig. 2 acquisition system software is calculated by timer module, communication management module, system cloud gray model administration module, GPRS communication module, the communication based on RS-485 interface MODBUS agreement, data acquisition, data analysis statistical, Data Storage.
Original Single Chip Microcomputer (SCM) program is transplanted to NUCLEUS operating system, under the original each merit can completely prerequisite of maintenance, running software is obtained more smooth; In system, need the initialization of the system that realizes, the timing acquiring of data, timing calculates, and timing stores; Communication part system need to realize timing data are sent to server by GPRS or MODBUS agreement and accept server initiatively call information; System administrative section then requires the setting that can accept systematic parameter, to the storage administration that Flash carries out, and the recovery of system disaster, the function of power down process.
In GPRS communication module, module initialization is namely to setting GPRS communication module being carried out to communications parameter, when there being data to send, first connects, and Successful login.When communication data receives in each network communication task, receive the data of specifying and connecting, and data are unpacked and resolves.The data of having packed are sent to remote server by GPRS module when sending by communication data.The package to communication data or deblocking can be realized.When the process prediction scheme in Network Abnormal situation in the process in communication.Check numbers when remote server dials the number of collection terminal and judge, if number is correct, collection terminal disconnects to be connected, and prepares to connect with server.Otherwise what does not do.To short message be received if there is the number arranging licensing function, then resolution data go forward side by side line parameter arrange and deleting short message.Otherwise do nothing.
Complete the initial work that MODBUS is relevant in RS-485 MODBUS module, accept the request of data requirement of primary server.Remote server is sent the data to by MODBUS agreement.The data that will send unpack according to MODBUS agreement according to MODBUS protocol format carry out the packing data that will receive.
Communication management module can identify that namely communication modes may be connected to RS-485modbus equipment to system and also be connected to GPRS equipment simultaneously in the process used.Communication management module is used for identifying and adopts which kind of mode to carry out communication.When amendment appears in systematic parameter, parameter is passed to system management module, makes it systematic parameter be upgraded.
System cloud gray model administration module startup in from flash the environmental parameter of reading system arrange.Receive from the parameter setting information of communication module, and current environment be configured to the parameter of coming in when front transfer and call the configuration parameter of the interface storage system of storage administration.
Data Storage stores 24 hour datas and namely all will call this administration module to store the data per hour of hour of just having pass by data acquisition equipment per hour.Supported data partition holding.The statistics of every day can be stored.If day, statistics was more than 95 days, delete the data of that day the earliest.Namely digital independent function receives the time of data, returns relevant total data.
Timer module can periodically be sampled to data.Within 1 minute, call statistical computation module to calculate real time data.When constantly little to 1, gather a secondary data, and call memory management module hour data is stored.After completing to the data acquisition of 1 day, call statistical module counts whole day data, and call memory management module storage.
Data analysis statistical computing module tries to achieve the statistical value of real time data and data on the one.Analyze the data collected whether to transfinite, or maximal value changes, or stop electrical data.If need the event of record then to call memory management module carry out data preservation.
The data collected, by SPI interface, are carried out preprocessing, the versatility used after guarantee by the electric quantity data at data collecting module collected scene.
Claims (3)
1. a GPRS coulomb collection system, is characterized in that, described system comprises CPU element, electric quantity acquisition unit, data storage cell, digital quantity input, digital output, power module, RS-485 communication interface and GPRS wave point; Data transmit and adopt GPRS module wireless transmission or RS-485 module bus mode two kinds of patterns; CPU module is two-way to be inputted 2 digital output (8DI/2DO) modules, electric quantity acquisition unit with 8 digital quantities and is connected; Be connected with 485 communication interface modules by a serial port, be connected with GPRS module by another serial port; In electric quantity acquisition unit, electric current and voltage accesses in the mode of star load, and electric current input 5A, gathers the electric current of A, B, C three-phase and zero line, carry out current transformation through current transformer; Electric current and voltage changes into Differential Input to special electric energy chip ATT7022B after conversion; ATT7022B inside is integrated with 7 road ADC, and ATT7022B provides SPI interface to be connected with CPU; GPRS module adopts SIM300C, the embedded ICP/IP protocol stack of this module; Acquisition system software is calculated by timer module, communication management module, system cloud gray model administration module, GPRS communication module, the communication based on RS-485 interface MODBUS agreement, data acquisition, data analysis statistical, Data Storage; Complete the initial work that MODBUS is relevant in RS-485 MODBUS module, accept the request of data requirement of primary server; Communication management Module recognition communication modes, is namely connected to RS-485modbus equipment and is also connected to GPRS equipment; System cloud gray model administration module startup in from flash the environmental parameter of reading system arrange; The data collected, by SPI interface, are carried out preprocessing, the versatility used after guarantee by the electric quantity data at data collecting module collected scene.
2. a kind of GPRS coulomb collection system according to claim 1, is characterized in that, it is system power supply that described power module adopts alternating current 220V to turn 5V, then is that CPU module is powered through the 3.3V that DC/DC conversion produces; The 4V produced is that GPRS module is powered; The 12V produced is DI/DO module for power supply; Electric quantity acquisition chip is powered by 5V.
3. a kind of GPRS coulomb collection system according to claim 1, is characterized in that, in described GPRS communication module, module initialization is namely to setting GPRS communication module being carried out to communications parameter.
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| CN108333961A (en) * | 2017-12-29 | 2018-07-27 | 国网浙江省电力公司丽水供电公司 | A kind of new distribution network data acquisition terminal |
| CN109738696A (en) * | 2019-02-28 | 2019-05-10 | 江苏海恩德电气有限公司 | Remote bill control ammeter and working method based on independent duplex |
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Application publication date: 20150401 |