CN108333961A - A kind of new distribution network data acquisition terminal - Google Patents

Abstract

The invention discloses a novel distribution network data acquisition terminal. It includes a main control board, a data acquisition board and a substrate. The main control board is equipped with a main control module, a GPRS module, a serial port module, a storage module, an alarm module, a human-computer interaction module, and a switch state acquisition circuit for detecting the state of a power distribution switch. There is an electric energy meter module on the data acquisition board, a power supply module and an AC signal conversion circuit on the base board, and the main control module is electrically connected to the GPRS module, serial port module, storage module, alarm module, human-computer interaction module and switch state acquisition circuit. , the main control module is electrically connected to the electric energy meter module through the serial port module, and the electric energy meter module is electrically connected to the AC signal conversion circuit. The invention realizes real-time monitoring of power parameters such as voltage, current, power, power factor, etc., collects switch status, has wireless communication technology, and feeds data and status back to the main station, providing distribution network planning, design, operation and maintenance and marketing Provide data basis and scientific decision-making basis.

Description

A new type of distribution network data acquisition terminal

technical field

The invention relates to the technical field of distribution network data monitoring, in particular to a novel distribution network data acquisition terminal.

Background technique

The distribution network is the network that directly connects the secondary side of the power system with the low-voltage power supply users. The distribution network is also the last link of power generation, transmission, transformation and distribution, and occupies an important position in the automation of the power system. There are two types of distribution network, urban distribution network and rural distribution network. Both networks are powered by multiple channels and have flexible operation modes. Therefore, the distribution network is also complex and changeable. Most of the distribution network is a tree structure, overhead Lines account for the vast majority, with poor reliability and high accident rates, such as equipment damage caused by severe overloading of distribution transformers, damage of distribution transformers caused by severe three-phase loads, and waste caused by long-term light-load operation of distribution networks Therefore, it is necessary to strengthen the management and application of smart distribution network.

Contents of the invention

In order to solve the above problems, the present invention provides a new type of distribution network data acquisition terminal, which realizes real-time monitoring of power parameters such as voltage, current, power, and power factor, and collects switch states. It has wireless communication technology and integrates data and The status is fed back to the main station to provide data basis and scientific decision-making basis for distribution network planning, design, operation and maintenance and marketing.

In order to solve the above problems, the present invention adopts the following technical solutions to achieve:

A novel distribution network data acquisition terminal of the present invention includes a main control board, a data acquisition board and a substrate, and the main control board is provided with a main control module, a GPRS module, a serial port module, a storage module, an alarm module, a man-machine An interactive module and a switch state acquisition circuit for detecting the state of the power distribution switch. The data acquisition board is provided with an electric energy meter module, and the base board is provided with a power supply module and an AC signal conversion circuit. The AC voltage input by the network is converted into a DC voltage to supply power to the main control board, data acquisition board and base board. The AC signal conversion circuit is used to convert the strong electric signal on the distribution network into a weak electric signal to provide sampling signals for the electric energy meter module. The main control module is electrically connected with the GPRS module, the serial port module, the storage module, the alarm module, the human-computer interaction module and the switch state acquisition circuit respectively, and the main control module is electrically connected with the electric energy meter module through the serial port module, and the electric energy meter module It is electrically connected with the AC signal conversion circuit.

In this technical solution, the input end of the power module on the substrate is connected to the distribution network, and the power module converts the AC voltage input from the distribution network into a DC voltage to supply power to the main control board, the data acquisition board and the substrate.

The AC signal conversion circuit is used to convert the strong electric signal on the distribution network into a weak electric signal, and provide the sampling signal (current and voltage) for the electric energy meter module, and the electric energy meter module detects the sampling signal to calculate the voltage, current, power, power factor and other power parameters, and send the detected data to the main control module to realize the function of detecting the voltage and current of the distribution network.

The main control module receives the collected data sent by the electric energy meter module, performs analysis and calculation, and obtains relevant statistical results. When abnormal information occurs, the alarm module sends an alarm, and at the same time stores relevant information and data in the storage module. The main control module sends the collected data of the electric energy meter module, the results of its own analysis and calculation and the abnormal conditions monitored to the main station through the GPRS module. The master control module can receive information from the master station. The switch state acquisition circuit is used to detect whether the power distribution switch is in the closed state or the open state.

The invention adopts a three-layer circuit board to realize the isolation between strong electricity and weak electricity, and the strong electricity only appears on the base plate and the data acquisition board, and will not contact the main control board, thus protecting the safety of electronic devices on the main control board.

Preferably, the human-computer interaction module includes a display screen, LED indicator lights and buttons, and the main control module is electrically connected to the display screen, LED indicator lights and buttons respectively.

Preferably, the main control module communicates wirelessly with the main station through a GPRS module.

Preferably, a switch control circuit for controlling closing/opening of the power distribution switch is further provided on the substrate, and the switch control circuit is electrically connected to the main control module.

Preferably, the electric energy meter module includes an ATT7022B electric energy metering chip and an STC12C5412 single-chip microcomputer, the ATT7022B electric energy metering chip is electrically connected to an AC signal conversion circuit, the ATT7022B electric energy metering chip is electrically connected to the STC12C5412 single-chip microcomputer through an SPI interface, and the main control The module is electrically connected with the STC12C5412 microcontroller through the serial port module.

Preferably, the power supply module includes an AC-DC conversion module, a DC-DC conversion module and an LDO module, the input end of the AC-DC conversion module is connected to the three-phase alternating current, and the output end of the AC-DC conversion module is connected to the The input end of the DC-DC conversion module and the input end of the LDO module are electrically connected, the voltage output by the AC-DC conversion module supplies power to the substrate, the voltage output by the DC-DC conversion module supplies power to the data acquisition board, and the voltage output by the LDO module Supply power to the main control board.

Preferably, a storage battery is further provided on the main control board, and the storage battery is electrically connected to the output terminals of the main control module and the LDO module. When the power module fails, the storage battery supplies power to the main control module, and the main control module sends power failure information to the main station through the GPRS module, and notifies the main station for timely maintenance.

The beneficial effects of the present invention are: real-time monitoring of power parameters such as voltage, current, power, power factor, etc., acquisition and control of switch status, wireless communication technology, feedback of data and status to the master station, and planning for the distribution network , design, operation and maintenance and marketing provide data basis and scientific decision-making basis.

Description of drawings

Fig. 1 is a kind of structural representation of the present invention;

Fig. 2 is a schematic connection block diagram of a circuit of the present invention.

In the figure: 1. Main control board, 2. Data acquisition board, 3. Substrate, 4. Main control module, 5. GPRS module, 6. Serial port module, 7. Storage module, 8. Alarm module, 9. Human-computer interaction Module, 10. Switch state acquisition circuit, 11. Energy meter module, 12. Power supply module, 13. AC signal conversion circuit, 14. Display screen, 15. LED indicator light, 16. Button, 17. Master station, 18. Switch Control circuit.

Detailed ways

The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Embodiment: A new distribution network data acquisition terminal of this embodiment, as shown in Figure 1 and Figure 2, includes a main control board 1, a data acquisition board 2 and a substrate 3, and the main control board 1 is provided with a main control module 4. GPRS module 5, serial port module 6, storage module 7, alarm module 8, man-machine interaction module 9 and switch state acquisition circuit 10 for detecting the state of power distribution switch, data acquisition board 2 is provided with electric energy meter module 11, substrate 3 There is a power module 12 and an AC signal conversion circuit 13 on it. The power module 12 is used to convert the AC voltage input from the distribution network into a DC voltage to supply power to the main control board 1, the data acquisition board 2 and the substrate 3. The AC signal conversion circuit 13 is used to convert the strong electric signal on the distribution network into a weak electric signal to provide sampling signals for the energy meter module 11, and the main control module 4 communicates with the GPRS module 5, the serial port module 6, the storage module 7, the alarm module 8, and the human-computer interaction module respectively. 9 is electrically connected with the switch state acquisition circuit 10, the main control module 4 is electrically connected with the electric energy meter module 11 through the serial port module 6, the electric energy meter module 11 is electrically connected with the AC signal conversion circuit 13, and the main control module 4 is connected with the main station through the GPRS module 5 17 for wireless communication.

The input end of the power module on the base board is connected to the distribution network, and the power module converts the AC voltage input from the distribution network into a DC voltage to supply power to the main control board, the data acquisition board and the base board.

The AC signal conversion circuit is used to convert the strong electric signal on the distribution network into a weak electric signal, and provide the sampling signal (current and voltage) for the electric energy meter module, and the electric energy meter module detects the sampling signal to calculate the voltage, current, power, power factor and other power parameters, and send the detected data to the main control module to realize the function of detecting the voltage and current of the distribution network.

The main control module receives the collected data sent by the electric energy meter module, performs analysis and calculation, and obtains relevant statistical results. When abnormal information occurs, the alarm module sends an alarm, and at the same time stores relevant information and data in the storage module. The main control module sends the collected data of the electric energy meter module, the results of its own analysis and calculation and the abnormal conditions monitored to the main station through the GPRS module. The master control module can receive information from the master station. The switch state acquisition circuit is used to detect whether the power distribution switch is in the closed state or the open state.

The invention adopts a three-layer circuit board to realize the isolation between strong electricity and weak electricity, and the strong electricity only appears on the base plate and the data acquisition board, and will not contact the main control board, thus protecting the safety of electronic devices on the main control board.

The main control module adopts AT91SAM7S256 chip. The memory module adopts the memory of FM3116 model of RAMTRON Company.

The human-computer interaction module 9 includes a display screen 14 , LED indicator lights 15 and buttons 16 , and the main control module 4 is electrically connected to the display screen 14 , LED indicator lights 15 and buttons 16 respectively.

A switch control circuit 18 for controlling closing/opening of the power distribution switch is also provided on the substrate 3 , and the switch control circuit 18 is electrically connected to the main control module 4 .

The energy meter module 11 includes an ATT7022B electric energy metering chip and an STC12C5412 single-chip microcomputer. The ATT7022B electric energy metering chip is electrically connected to the AC signal conversion circuit 13. The ATT7022B electric energy metering chip is connected to the STC12C5412 single-chip electromechanical through the SPI interface. The main control module 4 is connected to the STC12C5412 single-chip electromechanical through the serial port module. connect.

The power supply module 12 includes an AC-DC conversion module, a DC-DC conversion module and an LDO module. The input end of the AC-DC conversion module is connected to the three-phase alternating current, and the output end of the AC-DC conversion module is connected to the input end of the DC-DC conversion module. 1. The input terminal of the LDO module is electrically connected, the voltage output by the AC-DC conversion module supplies power to the substrate, the voltage output by the DC-DC conversion module supplies power to the data acquisition board, and the output voltage of the LDO module supplies power to the main control board.

The main control board 1 is also provided with a storage battery, and the storage battery is electrically connected to the output terminals of the main control module and the LDO module. When the power module fails, the storage battery supplies power to the main control module, and the main control module sends power failure information to the main station through the GPRS module, and notifies the main station for timely maintenance.

The software design of the electric energy meter module, the software design of the electric energy meter module includes the custom serial communication protocol, the single-chip microcomputer control and communication software and the computer software meter calibration platform design. For the communication between the customized serial communication guarantee table module and the software platform, the single-chip control platform can send and receive data information, and accept commands, and the control message is transmitted to the host computer through the full-duplex serial port. According to the needs of the table module, the computer software proofreading platform uses the designed interface to realize the control, storage and display functions of the computer to the table module.

A table module serial communication protocol:

The serial communication protocol includes three layers: application layer, data link layer, asynchronous serial communication protocol;

(a) Application layer

The function of the application layer is to perform the services provided by the data link layer, monitor the running status of the communication line, exchange data with the data link layer, and process the data. There are two kinds of commands sent by the host computer to the meter module, one is the data transmission command, which can request the meter module to initialize and report an error code through EE3000001E, request the meter module to transmit basic data through EE45000033, and request the meter module to transmit extended data through EE46000034. Send calibration data through EE47000035. The other is the meter calibration control command, which transmits the error information to the meter module and controls the meter module to complete the corresponding parameter accuracy correction operation. According to different host computer commands, there are two types of data frames returned by the meter module, one is the measurement data frame of ATTT022B, and the other is the calibration parameter data frame of ATT7022B.

(b) Data Link Layer

The core of serial communication is the data link layer. The function of this layer is to provide reliable services, assemble and split frames for the application layer;

To realize reliable data service, firstly, the upper computer application layer needs to send table module data to the data link layer, then the upper computer data link layer informs the application layer to store the received table module data in the input buffer, and finally the data link layer The layer sends the information of whether the communication is completed to the application layer;

Assemble the frame, group the data into a sequence according to the existing protocol, add 0xEE at the front of each frame, and add the check value of the frame at the back to form a transmission frame;

Splitting the frame is to decompose the data frame, select the part of the data, refit it into the data structure of the application layer, and then transmit it to the application layer.

(c) Asynchronous serial communication protocol

The unit of sending and receiving data in this protocol is bit, a total of 7-12 bits (among which, at the beginning is one start bit, then eight data bits, and finally one stop bit, without parity bit). The communication rate is 4800bit/s.

B MCU programming:

The program design is mainly reflected in the following aspects: interrupt program and main program, table module initialization program, reset program, communication program, parameter acquisition program and data sending program, calibration program, read and write program.

(a) Main program and interrupt program

Initialize first, the main program judges whether the ATT7022B is powered off or abnormally reset according to the ATT7022B abnormal flag bit, if the abnormal flag bit is set, then reset the ATT7022B and rewrite the accuracy correction parameters. Then, the main program judges whether to update the collected data according to the flag bit CJ. If it is set, the collected data is updated. The collection interval is 1s. The timer uses the timer 0 of STC12C5412 to set the collection time. Set, and then read the collected data. Finally, set the valid flag bit ML of the command to judge whether the serial port has received a valid command. ML=5 means a data transmission command, and ML=6 means a meter calibration control command.

(b) Table module initializer

The initialization program mainly includes the setting of internal functions, parameters and terminals of STC12C5412. The internal function setting is mainly the initialization of serial port and SPI. There are two working modes in the serial port initialization program. Timer 0 works in working mode 1, and the function is data acquisition. Timing, timer 1 works in working mode 2, the function is to carry out serial communication, the baud rate is 4800bit/s.

(c) Reset procedure

Set SIG, when the RESET signal is low level and the hold time exceeds 30us, reset is performed, and SIG shows high level. When RESET becomes high level and keeps for 500us, SIG shows low level, and ATT7022B enters normal state.

(d) Communication program

STC12C5412 reads and writes to ATT7022B through the SPI interface. When the highest bit of the command is 1, it means a write command; when the highest bit of the command is 0, it means a read command; After (writing), 24-bit data needs to be input from the DIN terminal.

(e) Parameter acquisition program and data sending program

The program mainly reads the data of ATT7022B by STC12C5412, and processes the voltage, current and power parameters according to the specified format:

(f) Calibration procedure

Each type of parameter has its corresponding calibration subroutine, and only one parameter is calibrated at a time, and the calibration parameter table needs to be updated after each completion.

Void Ugain(unsigned char phase, unsigned int Ur);

Void Igain(unsigned char phase, unsigned int Ir);

Void Pgain(int err, unsigned char command, unsigned char phase);

Void Phsreg(float err, unsigned char command, unsigned char phase);

Void GainAdc 7(unsigned int Ir7);

Void Istartup(float I0);

Void Iregion(unsigned char N, float Is);

Void Irechg(float Ig);

Void HFConst(unsigned int PulsEC);

Void HFDouble(unsigned char N);

Void EAddmode(unsigned char N);

Void UADCPga(unsigned char N);

(g) Flash read and write program

The Flash program memory has 24 sectors in total, and each sector is 512KB, which can be read and written, and can store ATT7022B calibration parameters, but each sector is programmed by byte and erased by sector.

Claims (7)

1. a kind of new distribution network data acquisition terminal, which is characterized in that including master control borad (1), data acquisition board (2) and substrate (3), the master control borad (1) is equipped with main control module (4), GPRS module (5), serial port module (6), memory module (7), alarm mould Block (8), human-computer interaction module (9) and the on off state Acquisition Circuit (10) for detecting panel switches state, the data acquisition Plate (2) is equipped with electric energy meter module (11), and the substrate (3) is equipped with power module (12) and AC signal conversion circuit (13), the power module (12) is used to the alternating voltage inputted from power distribution network being converted to DC voltage to master control borad (1), number It powers according to collection plate (2) and substrate (3), the AC signal conversion circuit (13) is used to convert the forceful electric power signal on power distribution network For weak electric signal be electric energy meter module (11) provide sampled signal, the main control module (4) respectively with GPRS module (5), serial ports Module (6), memory module (7), alarm module (8), human-computer interaction module (9) and on off state Acquisition Circuit (10) electrical connection, The main control module (4) is electrically connected by serial port module (6) with electric energy meter module (11), the electric energy meter module (11) with exchange Signaling conversion circuit (13) is electrically connected.

2. a kind of new distribution network data acquisition terminal according to claim 1, which is characterized in that the human-computer interaction mould Block (9) includes display screen (14), LED light (15) and button (16), the main control module (4) respectively with display screen (14), LED light (15) and button (16) electrical connection.

3. a kind of new distribution network data acquisition terminal according to claim 1, which is characterized in that the main control module (4) it is carried out wireless communication by GPRS module (5) and main website (17).

4. a kind of new distribution network data acquisition terminal according to claim 1 or 2 or 3, which is characterized in that the substrate (3) be additionally provided with the ON-OFF control circuit (18) for closing a floodgate/opening a sluice gate for controlling panel switches on, the ON-OFF control circuit (18) with Main control module (4) is electrically connected.

5. a kind of new distribution network data acquisition terminal according to claim 1 or 2 or 3, which is characterized in that the electric energy Table module (11) includes ATT7022B electric energy computation chips and STC12C5412 microcontrollers, the ATT7022B electric energy computation chips It is electrically connected with AC signal conversion circuit (13), the ATT7022B electric energy computation chips pass through SPI interface and STC12C5412 Monolithic mechatronics, the main control module (4) pass through serial port module (6) and STC12C5412 monolithic mechatronics.

6. a kind of new distribution network data acquisition terminal according to claim 1 or 2 or 3, which is characterized in that the power supply Module (12) includes AC-DC conversion module, DC-DC conversion modules and LDO modules, the input terminal of the AC-DC conversion module with Three-phase alternating current is electrically connected, the input of the output end of the AC-DC conversion module and the input terminal, LDO modules of DC-DC conversion modules End electrical connection, the voltage that the AC-DC conversion module exports are powered to substrate, and the voltage that DC-DC conversion modules export is to data Collection plate is powered, and the voltage that LDO modules export is powered to master control borad.

7. a kind of new distribution network data acquisition terminal according to claim 1 or 2 or 3, which is characterized in that the master control Accumulator is additionally provided on plate (1), the accumulator is electrically connected with the output end of main control module (4), LDO modules.