CN204794371U - Distribution network intelligence feeder terminal based on embedded many ARM - Google Patents

Abstract

The utility model relates to an intelligent feeder terminal of distribution network based on embedded multi-ARM, comprising: an AC input module coupled with a transmission line for collecting AC analog quantities; a measurement and control module connected with the AC input module for obtaining AC analog and convert to digital, calculate and save telemetry information according to the digital; switch input and output module, connected with the measurement and control module, used to obtain remote signal displacement information, and receive remote control information output from the measurement and control module; communication module , used to realize information exchange; human-computer interaction module, used to display parameter setting information; wireless module, used to receive or send wireless signals; wherein, the measurement and control module, communication module, and human-computer interaction module are each composed of an ARM processor as the control core. Compared with the prior art, the utility model has the advantages of increasing the safety and reliability of the distribution network automation feeder terminal.

Description

An intelligent feeder terminal for distribution network based on embedded multi-ARM

technical field

The utility model relates to the technical field of distribution network, in particular to an intelligent feeder terminal of distribution network based on embedded multi-ARM.

Background technique

The distribution network automation feeder terminal device is an important control unit of the entire distribution automation system. It has the functions of collecting distribution network operating parameters, storing fault information and remote signal displacement information, cutting off power supply in fault areas of the distribution network, and ensuring non-fault Regional power supply, connection to the control center system and other functions. The monitoring of the operation of the distribution network is realized, and the protection function can be realized by remote control or local operation for the operation and fault conditions of the distribution network.

In the last century, the distribution network automation feeder terminal device mainly relied on the 51 series single-chip microcomputer. In recent years, distribution automation feeder terminal devices using ARM+DSP multi-CPU structure have also appeared, but the hardware design of this kind of system is complicated, and there is a problem of incompatibility between the two CPUs. Although distribution automation feeder terminal devices are constantly developing, the development in communication cannot meet the requirements of modern power systems. The power system is a huge, transient multi-input and multi-output system. In order to ensure its safe operation, it is necessary not only to detect the operating status of each node in real time, but also to detect abnormal states and fault states of the power system in a timely manner, and to perform fast local Real-time control and processing, or notify the operating personnel to accept remote control instructions from the monitoring master station to deal with real-time fault conditions. This requires that the feeder automation terminal device installed at the node of the distribution network can not only quickly measure the operating parameters of the power grid, but also need to be able to exchange stable and safe data with the monitoring master station in the shortest possible time. However, the existing distribution network automation feeder terminal devices cannot meet the above requirements, and there are also problems of poor reliability and stability in the communication module circuit design and software design.

Utility model content

The purpose of this utility model is to provide an intelligent feeder terminal for distribution network based on embedded multi-ARM with high data compatibility and accurate data collection in order to overcome the above-mentioned defects in the prior art.

The purpose of this utility model can be achieved through the following technical solutions:

A distribution network intelligent feeder terminal based on embedded multi-ARM, including:

The AC input module is coupled and connected with the transmission line for collecting AC analog quantities;

The measurement and control module is connected with the AC input module, and is used to obtain the AC analog quantity and convert it into a digital quantity, and calculate and save the telemetry information according to the digital quantity;

The switch input and output module is connected with the measurement and control module, and is used to obtain the remote signal displacement information and receive the remote control information output of the measurement and control module;

The communication module is connected with the measurement and control module for information exchange;

The human-computer interaction module is connected with the communication module and used to display parameter setting information;

The wireless module is respectively connected to the measurement and control module and the communication module for receiving or sending wireless signals;

The power management module is connected to the measurement and control module, switch input and output module, communication module, human-computer interaction module and wireless module to provide power;

Wherein, the measurement and control module includes a first ARM processor, the communication module includes a second ARM processor, the human-computer interaction module includes a third ARM processor, and the first ARM processor communicates with the second ARM processor through a CAN bus. The ARM processors are connected, and the first ARM processor, the second ARM processor and the third ARM processor form a multi-ARM processor architecture.

The AC input module includes an RC filter circuit and multiple voltage transformers and multiple current transformers respectively connected to the RC filter circuit.

The measurement and control module includes an operational amplifier circuit, an AD chip and a storage unit, the operational amplifier circuit is respectively connected to the AD chip and the AC input module, the storage unit and the AD chip are respectively connected to the first ARM processor, and the storage unit Including SRAM chips and Flash chips.

The switch input and output module includes a photocoupler and 8 switch input units, 8 switch output units and 4 relay output units respectively connected to the photocoupler, and the photocoupler communicates with the measurement and control module through the bus transceiver connect.

The second ARM processor is connected with a level conversion chip and a PHY chip.

The second ARM processor is an interconnected ARM chip.

The man-machine interaction module also includes a keyboard for modifying parameter setting information and a display screen for displaying, and the third ARM processor is respectively connected to the communication module, the keyboard and the display screen.

The wireless module includes a bluetooth chip and a GPRS chip.

Compared with the prior art, the utility model has the following beneficial effects:

1. The measurement and control module, communication module and human-computer interaction module of the utility model each use an ARM chip as the main control chip, which is a multi-ARM architecture. The three ARM chips each perform their duties, work together, and have good data compatibility , to ensure the accuracy of information collection, the accuracy of accident handling operations and the compatibility and stability of communication;

2. Adopt the hardware design method based on the embedded multi-ARM processor structure, all CPUs are compatible with each other, the internal data transmission is stable, and there is no need to configure special interface circuits;

3. The ARM chip of the communication module is interconnected, and its Ethernet port is simple in design. It only needs to be connected with an external PHY chip to configure the Ethernet interface. It has good stability and can be compatible with different communication network media, and can forward smart devices on the communication network. message information.

4. It solves the problems of complex hardware design of the current distribution automation feeder terminal device, the incompatibility of the two CPUs in the hardware design method based on ARM+DSP, the poor reliability and stability of the communication module circuit design and software design, and the feeder automation The accuracy of information collection of the device, the accuracy of accident judgment and handling, and the stability of the operation of the feeder automation device have all been significantly improved (belonging to the summary of the above three improvements).

5. The utility model uses a modular design concept, which can significantly improve the accuracy and real-time performance of information collection and processing of distribution network automation feeder terminals, increase the safety and reliability of distribution network automation feeder terminals, and make maintenance and upgrading easier convenient.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a communication link topology diagram of the distribution network distributed system of the utility model.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the utility model, and the detailed implementation and specific operation process are given, but the protection scope of the utility model is not limited to the following examples.

As shown in Figure 1, a distribution network intelligent feeder terminal based on embedded multi-ARM, including AC input module 1, measurement and control module 2, switch input and output module 3, communication module 4, human-computer interaction module 5, wireless module 7 and power management module6. Among them, the measurement and control module 2, the communication module 4, and the human-computer interaction module 5 each have an ARM processor as the control core.

The AC input module 1 includes an RC filter circuit 13 and 5-way voltage transformers 11 and 4-way current transformers 12 respectively connected to the RC filter circuit. By "coupling" with the transmission line in a certain way, 5-way AC voltage, 3-way 1 way AC current and 1 way zero sequence current.

The measurement and control module 2 includes an operational amplifier circuit 23, an AD chip 22, a first ARM processor 21 and a storage unit connected in sequence. The operational amplifier circuit 23 is connected to the AC input module 1, and the first ARM processor 21 communicates with the communication module through the CAN bus 26. 4, the storage unit includes a SRAM chip 24 and a Flash chip 25, and the first ARM processor 21 is also connected with a JTAG interface 27 and an RTC clock 28. The measurement and control module obtains the AC analog quantity from the AC input module, converts it into a digital quantity by the 16-bit high-speed high-precision AD chip AD6706, and sends the data to the first ARM processor through the SPI port, and the first ARM processor uses the internal FFT algorithm to convert the data Perform processing to obtain remote measurement, and scan the switch input and output modules according to a certain period of time (1-5ms) to obtain the displacement information of the remote signal. The measurement and control module transmits telemetry and remote signaling information to the communication module through the CAN bus interface, and at the same time the communication module sends remote control commands to the measurement and control module through the CAN bus. After the measurement and control module receives the remote control command, it controls the action of the corresponding power relay through the switch value input and output module to open and close the field equipment. The operational amplifier circuit cooperates with the AD chip, so that the first ARM processor can obtain remote signaling data. The operational amplifier circuit used in this embodiment is simple in design and accurate in sampling.

The switch input and output module 3 is connected with the measurement and control module 2, including a photocoupler 31 and 8 switch input units 32, 8 switch output units 33 and 4 relay output units 34 respectively connected to the photocoupler 31. The device 31 is connected with the measurement and control module 2 through a bus transceiver. The switch input and output module 3 can be configured with 16 channels of switch variable remote signaling and 4 passive empty node remote control outputs. The measurement and control module scans the remote signal displacement information according to a certain time interval (1-5ms), or according to the remote control information, the measurement and control module outputs the remote control information through the switch input and output module.

The communication module 4 is connected with the measurement and control module 2 and configured with various communication protocols for realizing information exchange. Communication module 4 comprises the second ARM processor 41, and this second ARM processor 41 configures 4 RS232 serial communication network interfaces 42 and 2 RS485 serial communication network interfaces 43 through level conversion chips MAX3232 and MAX3485, and the second ARM The MAC controller peripheral of the Ethernet module of the processor 41 is connected with an external PHY chip DM9161A, and is configured with two 10/100M Ethernet communication network interfaces 44, which can be compatible with the physical interfaces of various current distribution network terminal equipment and monitoring master stations. Build a software platform based on the embedded operating system μCOS-II and communication protocol group on the ARM chip, design functional tasks under the software platform, and realize ModbusRTU, Modbus/TCP, IEC60870-5-101 and IEC60870-5-104 A variety of communication protocols, compatible with different communication network media, and can forward message information of smart devices on the communication network.

The human-computer interaction module 5 is connected with the communication module 4, and is used for receiving and displaying the telemetry information of the measurement and control module through the communication module, and receiving parameter setting information at the same time. The human-computer interaction module 5 includes a third ARM processor 51 , a keyboard 52 for parameter setting and a display screen 53 for displaying. The third ARM processor 51 is connected to the communication module 4 , the keyboard 52 and the display screen 53 respectively. The ARM processor of the human-computer interaction module 5 uses the USART interface, uses the level conversion chip AMAX3232 to configure the RS232 serial port, and then connects with the communication module. The human-computer interaction module can set relevant parameters, and the set parameters are sent to the communication through the RS232 interface. Module, the ARM chip of the communication module sends the parameter information to the measurement and control module through the CAN bus, and the ARM chip of the measurement and control module modifies the relevant parameter information after receiving the parameter information.

The power management module 6 is respectively connected to the measurement and control module 2, the switch input and output module 3, the communication module 4, the human-computer interaction module 5 and the wireless module 7 to provide power.

The wireless module 7 includes bluetooth 71 and GPRS 72, which are respectively connected to the measurement and control module 2, the communication module 4 and the power management module 6 to realize wireless communication.

Fig. 2 shows the communication link topology structure diagram of the distributed system where the device of the present invention is located. This device, as the distributed remote terminal FTU in the system, completes the communication with the regional substation through the serial link or network, and further communicates with the regional substation. The monitoring master station realizes information exchange, and the communication protocols include Modbus series communication protocols and IEC60870-5 series protocols, etc. The Modbus series communication protocol includes serial link protocol Modbus/RTU and network protocol Modbus/TCP; the IEC60870-5 series communication protocol includes serial link protocol IEC60870-5-101 and network protocol IEC60870-5-104, In the utility model, a variety of communication protocol protocols are integrated inside the feeder automation intelligent terminal device to form a communication protocol group. The feeder automation terminal device linked in the communication network can set the communication protocol through the human-computer interaction interface to match the corresponding network . The feeder automation terminal device can also be linked to the network or other intelligent devices without any protocol conversion equipment to complete functions such as data exchange and message forwarding.

To sum up, the utility model can realize the functions of remote measurement, remote signaling and remote control of 10kV power distribution lines. For example: real-time collection of current, voltage, power, harmonics and other data of the line, the collected data can be uploaded in seconds as a time unit, providing data support for distribution automation; accurate detection of line faults, including phase-to-phase short circuit, overcurrent , Single-phase grounding, overvoltage, undervoltage, phase loss, power failure and other faults or abnormal states, and realize accurate fault location, with remote remote control and local operation modes, when the fault is accurately determined, the switch on the control column can be used locally , isolate the faulty section, and restore the power supply of other non-faulty sections; the load carried by the overhead line changes greatly, the line is rebuilt frequently, and the transmission power and power supply direction of the line often change, so the value for judging the fault needs to be changed accordingly. All changes can be remotely changed by the background management center through the utility model, which is flexible to use. In a word, the utility model can not only improve the automation level of power distribution, but also increase the safety, stability and reliability of power distribution.

Finally, it should be noted that the above embodiments are only used for the technical solutions of the present utility model rather than limiting the protection scope of the present utility model. Although the utility model has been described in detail with reference to the best embodiment, those skilled in the art should understand , the technical solution of the invention can be modified or replaced equivalently without departing from the essence and scope of the technical solution of the present utility model.

Claims (7)

1., based on a power distribution network Intelligent FTU of embedded many ARM, it is characterized in that, comprising:

Exchanging input module, being of coupled connections with transmission line, for gathering ac analog;

Control module, is connected with interchange input module, for obtaining ac analog and being converted to digital quantity, calculates and preserve telemetry intelligence (TELINT) according to described digital quantity;

Switch input/output module, is connected with control module, and for obtaining remote signalling displacement information, and the remote information receiving control module exports;

Communication module, is connected with control module, for realizing information exchange;

Human-computer interaction module, is connected with communication module, for display parameters configuration information;

Wireless module, connects control module and communication module respectively, for receiving or sending wireless signal;

Power management module, connects control module, switch input/output module, communication module, human-computer interaction module and wireless module respectively, provides power supply;

Wherein, described control module comprises the first arm processor, described communication module comprises the second arm processor, described human-computer interaction module comprises the 3rd arm processor, described first arm processor is connected with the second arm processor by CAN, and the first arm processor, the second arm processor and the 3rd arm processor form many arm processors framework.

2. the power distribution network Intelligent FTU based on embedded many ARM according to claim 1, is characterized in that, described interchange input module comprises RC filter circuit and the plurality of voltages instrument transformer be connected with RC filter circuit respectively and Multi-path electricity current transformer.

3. the power distribution network Intelligent FTU based on embedded many ARM according to claim 1, it is characterized in that, described control module also comprises discharge circuit, A/D chip and memory cell, described discharge circuit connects A/D chip respectively and exchanges input module, described memory cell, A/D chip connect the first arm processor respectively, and described memory cell comprises sram chip and Flash chip.

4. the power distribution network Intelligent FTU based on embedded many ARM according to claim 1, it is characterized in that, described switch input/output module comprises photoelectrical coupler and the 8 way switch amount input units be connected with photoelectrical coupler respectively, 8 way switch amount output units and No. 4 relay output units, and described photoelectrical coupler is connected with control module by bus transceiver.

5. the power distribution network Intelligent FTU based on embedded many ARM according to claim 1, is characterized in that, described second arm processor is connected with level transferring chip and PHY chip.

6. the power distribution network Intelligent FTU based on embedded many ARM according to claim 5, is characterized in that, described second arm processor is interconnection type ARM chip.

7. the power distribution network Intelligent FTU based on embedded many ARM according to claim 1, it is characterized in that, described human-computer interaction module also comprises the keyboard for revising parameter setting information and the display screen for showing, and described 3rd arm processor connects communication module, keyboard and display screen respectively.