Intelligent line selection device

Abstract

The utility model discloses an intelligent line selection device which is characterized in that the intelligent line selection device comprises a controller, a line selection terminal device and a semi-physical simulation platform, the controller is connected with one end of the line selection terminal device, and the other end of the line selection terminal device is connected with the semi-physical simulation platform; the line selection terminal device comprises a main control module, a driving module, a switch array, a communication module and a display module; a communication module is connected between one end of the main control module and the display module, the other end of the main control module is connected with the input end of the driving module, and the output end of the driving module is connected with the switch array; a reed pipe relay is arranged at an array node of the switch array, and gating of a corresponding line is achieved through on-off of the reed pipe relay. Input end short circuit caused by misoperation can be avoided, and high-frequency signal interference can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of line selection of a new power system, in particular to an intelligent line selection device. Background Art

[0002] In the context of building a new power system, promoting the grid connection and consumption of a high proportion of renewable energy will become a top priority for building a new power system. With the continuous development of new energy and the continuous increase in the proportion of installed capacity, the safe and stable operation of large power grids faces huge challenges. Research on new energy grid connection control technology has become a current hot topic. Due to the needs of new energy actual measurement modeling, grid connection detection and other work, it is necessary to calibrate the point table of the device to be tested and connect the device port when conducting hardware-in-the-loop simulation experiments. Due to the excessive number of device communication pins, the process requires wiring and debugging of each pin one by one. At present, the line selection is only done manually, with poor accuracy and timeliness, and it is easy to cause problems such as misselection and omission, and it is not easy to troubleshoot and modify. At the same time, the level signals required by some pins of different controllers or test equipment are not uniform, and it is necessary to provide a DC level signal separately or connect a resistor in series on the line. The port communication protocols of different experimental platforms are incompatible. Replacing the test platform requires rewiring, which brings great inconvenience to the test. Utility Model Content

[0003] In view of the shortcomings of the prior art, the utility model provides an intelligent line selection device, which can be programmed online in real time to change the port definition and the wiring between the selection pins, meet the needs of quick selection of pin signals between different controllers or test equipment and different semi-physical simulation systems, and can dynamically modify the port signal definition online in real time, and at the same time provide a stepless adjustable voltage source to provide the required specific level signals for different devices, thereby reducing manual debugging time and error rate and improving work efficiency.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An intelligent line selection device, characterized in that it comprises: a controller, a line selection terminal device and a semi-physical simulation platform, wherein the controller is connected to one end of the line selection terminal device, and the other end of the line selection terminal device is connected to the semi-physical simulation platform;

[0006] The line selection terminal device includes a main control module, a drive module, a switch array, a communication module and a display module;

[0007] A communication module is connected between one end of the main control module and the display module, the other end of the main control module is connected to the input end of the driving module, and the output end of the driving module is connected to the switch array;

[0008] Reed switch relays are arranged at the array nodes of the switch array, and the corresponding lines are switched on and off by turning the reed switch relays on and off.

[0009] As a further technical solution, the driving module includes a first encoder, which is simultaneously connected to a plurality of second encoders, each of which is connected to a relay driving unit; and each of the relay driving units is connected to a reed switch relay.

[0010] As a further technical solution, the line selection terminal device also includes a power supply module, which includes a first step-down unit and a second step-down unit. The first step-down unit and the second step-down unit operate independently. The first step-down unit supplies power to the drive module, and the second step-down unit supplies power to the main control module.

[0011] As a further technical solution, the communication module includes a first communication unit and a second communication unit, and the communication module is used for communication between the display module and the main control unit.

[0012] As a further technical solution, one end of the first communication unit is connected to the main control module, and the other end is connected to the display module; one end of the second communication unit is connected to the main control module.

[0013] As a further technical solution, the second communication unit is further configured with an isolation circuit, one end of the isolation circuit is connected to the second communication unit, and the other end of the isolation circuit is connected to the main control module.

[0014] As a further technical solution, the input end of the switch array is a 40-way terminal block, including 2 redundant terminals and 1 voltage regulating terminal; the output end of the switch array is a 37-way terminal block.

[0015] As a further technical solution, the input port of the switch array is used as the input end of the line selection terminal device and is connected to the controller, and the output port of the switch array is used as the output end of the line selection terminal device and is connected to the semi-physical simulation platform.

[0016] As a further technical solution, the connection terminals are mutually exclusive.

[0017] As a further technical solution, the main control module, the drive module, the switch array, the communication module, the display module and the power module are all integrated on the same circuit main board.

[0018] One or more technical solutions of the utility model have the following beneficial effects:

[0019] 1. The utility model adopts a switch array with low impedance and high reliability to ensure instantaneous lossless transmission of signals in the line; effectively realizes input isolation and mutual exclusion through hardware circuit design to avoid input short circuit caused by misoperation; isolates analog circuits and digital circuits to avoid high-frequency signal interference; configures a voltage stepless adjustment module to meet the requirements of any port level; configures one or two sets of redundant ports as backup;

[0020] 2. The utility model can freely configure the definition of each port pin and the connectivity relationship of any port on both sides in the software interface, and realize the mutual exclusion isolation of the output port through software design; the above information is synchronously displayed on the LCD screen, which is convenient for the experimenter to control the port status in real time; the switch array can respond quickly and accurately to the host computer instructions;

[0021] 3. The utility model can assist technicians to quickly carry out hardware-in-the-loop test and debugging work, significantly improve the safety and intelligence level of the laboratory, save debugging time, shorten the test period, and the device is easy to operate, highly reliable, and has strong scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] Figure 1 This is a schematic diagram of the principle of the intelligent line selection device of the utility model;

[0024] Figure 2 This is a principle framework diagram of the line selection terminal device of the utility model;

[0025] Figure 3 This is the principle diagram of the main control module of the utility model;

[0026] Figure 4 This is a schematic diagram of the switch array of the utility model;

[0027] Figure 5 This is a schematic diagram of the drive module of the utility model;

[0028] Figure 6 This is a schematic diagram of the hardware design of the drive module of the utility model;

[0029] FIG7( a ) is a schematic diagram of the first step-down unit of the present invention;

[0030] FIG7( b ) is a schematic diagram of the second voltage-reducing unit of the present invention;

[0031] FIG8( a ) is a schematic diagram of the first communication unit of the present invention;

[0032] FIG8( b ) is a schematic diagram of the second communication unit of the present invention;

[0033] FIG8( c ) is a schematic diagram of an isolation circuit configured for the second communication unit of the present invention; DETAILED DESCRIPTION

[0034] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] Embodiment 1

[0036] like Figure 1 As shown, the utility model provides an intelligent line selection device. The main idea is to develop a programmable intelligent line selection device with a universal interface such as DB37. Through hardware development and control strategy design, the pin definition of each port can be freely set online, the connectivity relationship of any port on both sides of the input and output can be changed, and any level value can be assigned to the port to realize the intelligent gating of data signals between devices such as simulation test platforms and controller devices. The intelligent line selection device includes: a controller, a line selection terminal device and a semi-physical simulation platform, wherein the semi-physical simulation platform is a simulation system that comprehensively utilizes virtual simulation and actual hardware devices. It combines the virtual environment with the real hardware device to provide a more realistic and accurate simulation experience. The controller is connected to one end of the line selection terminal device, and the other end of the line selection terminal device is connected to the semi-physical simulation platform. The line selection terminal device acts like a switch or a repeater. The wiring of the controller and the semi-physical simulation platform are connected to the line selection terminal device. By setting the device, the signal connectivity relationship between the controller and the semi-physical simulation platform can be realized.

[0037] In this embodiment, if Figure 2 As shown, the line selection terminal device includes device hardware design and device software design. The device hardware design includes a main control module, a drive module, and a switch array; the device software design includes a communication module and a display module. A communication module is connected between one end of the main control module and the display module, and the other end of the main control module is connected to the input end of the drive module. The output end of the drive module is connected to the switch array, wherein a reed switch relay is placed at the array node of the switch array, and the corresponding line is selected by turning on and off the reed switch relay.

[0038] like Figure 3The main control module schematic diagram shown in the figure shows that the main control module adopts the STM32L151C8T6 type single-chip microcomputer. The STM32L151C8T6 series single-chip microcomputer is an ultra-low power 32-bit MCU microcontroller produced by STMicroelectronics. It integrates the Cortex-M3 core, with a maximum main frequency of 32MHz, strong performance, moderate data storage space, integrated 64KB flash memory and 16KB RAM, and supports multiple communication interfaces, including UART, SPI, I2C, CAN, etc., to meet the communication needs of line selection equipment.

[0039] like Figure 4 The switch array schematic diagram shown in the figure shows that a 40×37 switch array is established in this embodiment, wherein the input port is a 40-way wiring terminal, including 2 redundant wiring terminals and 1 voltage regulating wiring terminal, and the output port is a 37-way wiring terminal, wherein the input port is used as the input end of the line selection terminal device and is connected to the controller, and the output port of the switch array is used as the output end of the line selection terminal device and is connected to the semi-physical simulation platform. A reed switch relay is placed at the array node, and by analyzing the gating instruction on the display module, the reed switch relay at the corresponding node position is driven to turn on and off to achieve the gating of the corresponding line. Secondly, the analysis of the gating instruction is parsed by the control unit, and the hardware signal is sent to each unit module through SPI. At the same time, in order to ensure that the short circuit of the internal travel closed-loop path of the device is caused by misoperation during the gating process, the input end realizes hardware mutual exclusion between the wiring terminals through hardware design, and the output end realizes mutual exclusion from the software aspect, thereby ensuring the safety of the device during use.

[0040] like Figure 5 The schematic diagram of the driving module shown in the figure shows that the driving module includes a first encoder 74HC595. The first encoder 74HC595 is connected to several second encoders 74HC238 at the same time. Each second encoder 74HC238 is connected to a relay driving unit ULN2803; each relay driving unit ULN2803 is connected to a reed switch relay. The main control module sends serial instructions to the first encoder 74HC595 through SPI. SPI refers to a four-wire communication protocol between chips. In this embodiment, it refers to a form of instructions sent by the main control module. The first encoder 74HC595 transmits to the second encoder 74HC238, and then transmits to the relay driving unit ULN2803, thereby realizing the chip selection and bit selection of the relay module. The second encoder 74HC238 ensures the mutual exclusion between the input pins from the hardware aspect, and the relay driving unit ULN2803 completes the drive of the corresponding reed switch. As shown in FIG. Figure 6As shown, since the number of drive unit boards in the main control module is large and the drive signal is weak, the signal needs to be amplified by the signal amplifier 74HC244 before access. The first encoder 74HC595 receives the 8-bit SPI data signal passing through, converts it into chip select E3, E2, E1 and bit select signals A, B, C, completes the chip select of 5 second encoders 74HC238 and the selected second encoder 74HC238 bit number, and enhances the drive signal through the relay drive unit ULN2803 to drive the corresponding reed switch relay.

[0041] In this embodiment, as shown in Figure 7 (a)-(b), the line selection terminal device also includes a power module, the power module includes a first buck unit and a second buck unit, the first buck unit and the second buck unit operate independently, the first buck unit is designed based on the voltage regulator chip TPS54360DDA, which has a large power supply capacity and can realize 12V to 5V to power the drive module, and the second buck unit uses the AMS1117-3.3_C6186 chip to convert 5V to 3.3V to power the main control module.

[0042] As shown in Figure 8(a)-(c), the communication module includes a first communication unit RS232 and a second communication unit RS485. One end of the first communication unit RS232 is connected to the main control module, and the other end is connected to the display module; one end of the second communication unit RS485 is connected to the main control module, and the other end is connected to the computer, in preparation for subsequent functional expansion. Specifically, the second communication unit is also equipped with an isolation circuit, one end of the isolation circuit is connected to the second communication unit, and the other end is connected to the main control module, that is, the second communication unit is connected to the main control module through the isolation circuit.

[0043] In this embodiment, the software design of this device adopts the master-slave mode, the display module acts as the server, the main control module acts as the client, and the client follows the modbus protocol to poll and send requests to the server, query the server information update status, and timely update the driver board switch array status.

[0044] If the server has a line selection update, the client request is successful, that is, the client receives a message packet containing 37 bytes, which are the input and output selection states. The client performs a message rule check on the message packet, and if the check passes, the message packet is encoded and converted into chip selection and bit selection signals to realize the on and off of the corresponding reed switch relay.

[0045] In this embodiment, the overall device shell design is also included. The main control module, drive module, switch array, communication module, display module and power module are all integrated on the same circuit mainboard. The circuit mainboard is set in the stainless steel sheet metal shell. The shell design is divided into: parts cutting, sheet metal processing and surface treatment; among them, the stainless steel sheet metal shell has the advantages of beautiful appearance, easy disassembly, good mechanical rigidity, corrosion resistance, etc. In addition, stainless steel material is conducive to the heat dissipation of the equipment, so the device shell in this embodiment uses stainless steel as the main material. To manufacture the shell, firstly cut the high-quality SUS304 cold-rolled sheet by laser cutting. The shape and size of the cutting shall be based on the expansion drawing of the design part drawing. This device needs to cut 6 pieces of raw materials of different sizes and shapes according to the drawing. Using laser cutting to cut materials has the advantages of good processing quality, smooth and clean appearance, and high cutting accuracy.

[0046] In order to ensure the heat dissipation performance of the equipment and increase the ventilation volume inside the shell, several vents are designed on both sides of the shell to improve the internal ventilation performance of the equipment and improve the heat dissipation efficiency; the vents are all rectangular long cuts and can be processed by laser cutting.

[0047] Then, the raw materials of the parts processed by laser cutting are the unfolded styles of the parts, which need to be formed into the required parts through sheet metal bending. According to the design drawings, the corresponding parts are bent by a bending machine. After the bending is completed, the bending effect, angle, deformation and cracks are checked.

[0048] The box connection needs to be fixed by screws. To facilitate the later installation and disassembly, the fixing method of screws and nuts is adopted. To simplify the operation, the nuts are welded at the corresponding fixing holes during design, avoiding the need to operate the screws and nuts at the same time during installation and disassembly. Therefore, after the parts are bent, the corresponding nuts are spot welded at the fixing holes by argon arc welding. Since the heat caused by welding may cause the nuts to deform, spot welding, interval welding and other processes are required during the welding process.

[0049] Finally, after the sheet metal process, there will be scratches, ablation and other traces on the surface of the parts. In order to make the appearance of the box meet the requirements, sandblasting and painting are required after the sheet metal processing of the parts is completed. Sandblasting of parts can effectively remove surface oil, scratches, defects, and completely remove the old layer on the surface of the parts, providing conditions for painting.

[0050] After sandblasting, the parts are painted. The paint is cured by high-temperature baking. Compared with spray painting, high-temperature paint has the advantages of smooth surface, uniform color, and not easy to fall off.

[0051] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An intelligent line selection device, characterized in that: include: A controller, a line selection terminal device and a semi-physical simulation platform, wherein the controller is connected to one end of the line selection terminal device, and the other end of the line selection terminal device is connected to the semi-physical simulation platform; The line selection terminal device includes a main control module, a drive module, a switch array, a communication module and a display module; A communication module is connected between one end of the main control module and the display module, the other end of the main control module is connected to the input end of the driving module, and the output end of the driving module is connected to the switch array; Reed switch relays are arranged at the array nodes of the switch array, and the corresponding lines are switched on and off by turning the reed switch relays on and off.

2. The intelligent line selection device according to claim 1, characterized in that: The driving module includes a first encoder, which is simultaneously connected to a plurality of second encoders, each of which is connected to a relay driving unit; and each of the relay driving units is connected to a reed switch relay.

3. The intelligent line selection device according to claim 1, characterized in that: The line selection terminal device also includes a power supply module, which includes a first step-down unit and a second step-down unit. The first step-down unit and the second step-down unit operate independently. The first step-down unit supplies power to the driving module, and the second step-down unit supplies power to the main control module.

4. The intelligent line selection device according to claim 1, characterized in that: The communication module includes a first communication unit and a second communication unit, and the communication module is used for communication between the display module and the main control unit.

5. The intelligent line selection device according to claim 4, characterized in that: One end of the first communication unit is connected to the main control module, and the other end is connected to the display module; one end of the second communication unit is connected to the main control module.

6. The intelligent line selection device according to claim 5, characterized in that: The second communication unit is further configured with an isolation circuit, one end of the isolation circuit is connected to the second communication unit, and the other end of the isolation circuit is connected to the main control module.

7. The intelligent line selection device according to claim 1, characterized in that: The input end of the switch array is a 40-way wiring terminal, including 2 redundant wiring terminals and 1 voltage regulating wiring terminal; the output end of the switch array is a 37-way wiring terminal.

8. An intelligent line selection device as claimed in claim 7, characterized in that: The input port of the switch array is used as the input end of the line selection terminal device and is connected to the controller. The output port of the switch array is used as the output end of the line selection terminal device and is connected to the semi-physical simulation platform.

9. The intelligent line selection device according to claim 7, characterized in that: The wiring terminals are mutually exclusive.

10. The intelligent line selection device according to claim 1, characterized in that: The main control module, drive module, switch array, communication module, display module and power module are all integrated on the same circuit main board.

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