Primary frequency modulation control device based on Ethernet bus

Abstract

The utility model relates to the technical field of power primary frequency modulation, in particular to a primary frequency modulation control device based on an Ethernet bus, which comprises a switch module, a CPU (central processing unit) module, a digital output (DO) module, a digital input (DI) module, a 4-20mA output (AO) module, a 4-20mA acquisition AI module, an analog acquisition AC module, a GOOSE signal communication module, a power module and a touch LCD (liquid crystal display) module. All the modules are powered by 24V and 5V power buses, data communication is carried out by using an Ethernet bus, and time synchronization adopts a PPS time synchronization bus; according to the utility model, the internal backplane bus is adopted, the independent switch module is added for data interaction of the Ethernet, all MCU Ethernet adopts a W5500 extended Ethernet, and an FPGA is not used, so that the universality and expansibility are improved, the cost is reduced, the reliability of data transmission is improved, and very important significance is provided for engineering field use.

Description

Technical Field

[0001] The utility model belongs to the technical field of primary frequency regulation in electric power, and particularly relates to a primary frequency regulation control device based on an Ethernet bus. Background Art

[0002] In existing primary frequency regulation equipment, industrial personal computers are mostly used in terms of hardware. There are external monitors, mice and keyboards, and PCIE channels are used to expand network ports, RS485 interfaces, DI and DO interfaces.

[0003] There are several disadvantages in implementing with an industrial personal computer: First, it cannot access analog quantities such as voltage and current to measure frequency, and frequency and other data provided by another measurement and control device are required; second, the number of PCIE channels of the industrial personal computer is limited. When expanding other interfaces such as 4-20mA acquisition interfaces, 4-20mA output interfaces, and GOOSE communication interfaces, it is very difficult to expand. If the Ethernet is used to expand the interfaces through an external module via a network cable, the entire system will be messy and the probability of failure will increase; third, most of the sub-interfaces expanded through the PCIE interface need to use FPGA to implement the decoding of PCIE data, resulting in high costs; fourth, a monitor, mouse and keyboard must be available for human-computer interaction. Summary of the Utility Model

[0004] The utility model provides a primary frequency regulation control device based on an Ethernet bus to solve problems in the prior art such as the inability to independently measure frequency using an industrial personal computer, the limitation of the number of PCIE expansion interfaces, the high cost of adding FPGA chips to sub-modules, and the requirement of connecting a monitor, mouse and keyboard for human-computer interaction.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A primary frequency regulation control device based on an Ethernet bus. The structure of the device adopts a 4U 19-inch chassis in the CPCI form, and includes a switch module, a CPU module, a digital quantity output DO module, a digital quantity input DI module, a 4-20mA output AO module, a 4-20mA acquisition AI module, an analog quantity acquisition AC module, a GOOSE signal communication module, a power supply module and a touch LCD module. Each module is connected to the backplane of the chassis in a rear pluggable form;

[0007] The digital quantity output DO module, the digital quantity input DI module, the 4-20mA output AO module, the 4-20mA acquisition AI module, and the GOOSE signal communication module all adopt 32-bit MCU chips and are connected to the switch module through an Ethernet extended by the SPI bus;

[0008] Each functional module performs data interaction with the CPU module through an Ethernet cable, and the switch module uniformly receives, sends and schedules data.

[0009] Further, the power supply for other functional modules except the power supply module comes from the 24V and 5V power buses on the backplane; the power supply module provides voltage and current for the power buses.

[0010] Further, the CPU module uses an Allwinner A40i processor, and the processor is connected to the switch module through a 100M Ethernet; the CPU module integrates a 32-bit high-speed MCU, which is connected to the analog quantity acquisition AC module through the backplane to realize the acquisition of analog quantities of voltage and current, calculate data such as frequency, and send it to the A40i processor through the bus.

[0011] Further, the switch module is composed of two BCM5338M chips connected in series, providing 18 Ethernet interfaces.

[0012] Further, the analog quantity acquisition AC module is connected to the CPU module through the backplane.

[0013] Further, the touch LCD module is located on the front panel of the chassis, uses a 7-inch capacitive touch screen, and is connected to the backplane of the chassis through Ethernet.

[0014] The utility model includes but is not limited to the following beneficial effects:

[0015] The primary frequency modulation control device provided by the utility model adopts an internal backplane bus, and adds an independent communication control switch module for data interaction of Ethernet. All MCU Ethernets use W5500 to expand Ethernet, and FPGA is not used, so the versatility and expandability are improved. It not only reduces the cost, but also improves the reliability of data transmission, which is of great significance for use in the engineering field. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the composition structure of the utility model;

[0017] Figure 2 is a front view schematic diagram of the device of the utility model;

[0018] Figure 3 is a schematic diagram of the structural composition of the digital quantity output DO module in the utility model;

[0019] In the figure: 1. Switch module; 2. CPU module; 3. Digital quantity output DO module; 4. Digital quantity input DI module; 5. 4 - 20 mA output AO module; 6. 4 - 20 mA acquisition AI module; 7. Analog quantity acquisition AC module; 8. GOOSE signal communication module; 9. Power supply module; 10. Touch LCD module; 11. Ethernet bus; 12. PPS time synchronization bus; 31. External wiring terminal; 32. MCU chip; 33. LDO power supply chip; 34. SPI to Ethernet chip; 35. Internal connection backplane connection terminal. Specific implementation mode

[0020] In order to enable those skilled in the art to better understand the present utility model, the technical solution of the present utility model will be further described below in conjunction with the drawings and embodiments.

[0021] Embodiment 1: A primary frequency modulation control device based on an Ethernet bus, referring to Figure 1 As shown, the structure adopts a CPCI - type 4U 19 - inch chassis, including a switch module 1, a CPU module 2, a digital quantity output DO module 3, a digital quantity input DI module 4, a 4 - 20 mA output AO module 5, a 4 - 20 mA acquisition AI module 6, an analog quantity acquisition AC module 7, a GOOSE signal communication module 8, and a 7 - inch touch LCD module 10. Each module is connected to the backplane of the chassis in a rear - plug - in form;

[0022] The CPU module 2 and each functional module perform data interaction using the Ethernet bus 11, and the switch module 1 is used for unified data receiving, transmitting, and scheduling.

[0023] The power supply for all modules except the power supply module 9 comes from the 24V and 5V power buses on the backplane. The power supply module 9 is also plugged on the backplane to provide voltage and current for the power buses. All module data communications use the Ethernet bus 11, and the time synchronization uses the PPS time synchronization bus 12, ensuring consistent time.

[0024] In this device, 1 - 2 power supply modules 9 can be configured. The digital quantity output DO module 3, the digital quantity input DI module 4, the 4 - 20 mA output AO module 5, the 4 - 20 mA acquisition AI module 6, and the GOOSE signal communication module 8 can be configured with up to 7 pieces according to needs. 1 switch module 1, 1 backplane, 1 - 3 analog quantity acquisition AC modules, and 1 touch LCD module are configured.

[0025] Specifically, in this embodiment, the power supply module 9 supports the input of AC voltage 220V and DC voltage 220V, and the adaptive output voltage / current is 24V / 1.5A and 5V / 6A, which is used for power supply to each module of the device.

[0026] In this embodiment, the CPU module 2 uses the Allwinner A40i processor, with a Cortex-A7 architecture, a main frequency of 1.2 GHz, 1 GB of memory, the DDR3L uses the Unigroup Guoxin SCB15H1G160AF, and the storage EMMC uses the device MTFC8GAKAJCN; the processors are connected to the switch module 1 on the backplane through a 100-Mbps Ethernet. The CPU module 2 integrates a 32-bit high-speed MCU, which is connected to the analog quantity acquisition AC module 7 through the backplane to realize the acquisition of analog quantities such as voltage and current, and calculate data such as frequency, and send it to the A40i processor through the power bus.

[0027] The switch module 1 is formed by connecting two BCM5338M chips in series, providing a total of 18 Ethernet interfaces for connection to the backplane.

[0028] In this embodiment, the digital output DO module 3, the digital input DI module 4, the 4-20 mA output AO module 5, the 4-20 mA acquisition AI module 6, and the GOOSE signal communication module 8 all use 32-bit MCU chips as processors, and expand Ethernet through the SPI bus to connect to the switch module 1.

[0029] Among them, the GOOSE signal communication module 8 has one external Ethernet communication interface, the digital input DI module 4 has 16 inputs, the digital output DO module 3 has 16 outputs, the 4-20 mA acquisition AI module has 8 isolated 4-20 mA acquisition circuits, and the 4-20 mA output AO module has 4 isolated 4-20 mA outputs.

[0030] Taking the digital output DO module 3 as an example for structural description, it includes external wiring terminals 31, an MCU chip 32, an LDO power supply chip 33, an SPI-to-Ethernet chip 34, and internal backplane connection terminals 35, specifically referring to Figure 3 as shown. Among them, the SPI-to-Ethernet chip 34 uses a W5500 chip to complete the Ethernet expansion function of the MCU. The digital input DI module 4, the digital output DO module 3, the 4-20 mA acquisition AI module 6, the 4-20 mA output AO module 5, and the GOOSE signal communication module 8 all use the above scheme to expand Ethernet.

[0031] Specifically, the analog quantity acquisition AC module 7 is composed of 12 voltage transformers and 12 current transformers, which realizes the voltage and current transformation of the grid AC signal for analog quantity sampling; it can access 20 - 400V AC voltage signals, can access 1A or 5A current signals, and converts them into -5V - 5V voltage signals, and is connected to the CPU module 2 through the backplane.

[0032] The touch LCD module 10 is located on the front panel of the 4U chassis. It uses a 7-inch capacitive touch screen and is connected to the backplane via Ethernet to complete the human-machine interaction function.

[0033] The backplane also provides a PPS time synchronization bus 12. The CPU module 2 resolves the B-code time synchronization signal into PPS second pulses and distributes them to the PPS time synchronization bus 12 to provide time synchronization signals for other functional modules.

[0034] A primary frequency regulation control device based on the Ethernet bus provided by an embodiment of the present invention uses an internal backplane bus and adds an independent communication control switch module for data interaction of Ethernet. All MCUs use W5500 to expand Ethernet without using FPGA, improving the versatility and expandability, not only reducing costs but also improving the reliability of data transmission, which is of great significance for use in engineering sites.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A primary frequency regulation control device based on an Ethernet bus. The structure of this device adopts a 4U 19-inch chassis in the CPCI form. It is characterized in that, It includes a switch module, a CPU module, a digital output DO module, a digital input DI module, a 4-20 mA output AO module, a 4-20 mA acquisition AI module, an analog acquisition AC module, a GOOSE signal communication module, a power supply module and a touch LCD module. Each module is connected to the backplane of the chassis in a rear pluggable form; The digital output DO module, the digital input DI module, the 4-20 mA output AO module, the 4-20 mA acquisition AI module and the GOOSE signal communication module all use 32-bit MCU chips and expand Ethernet through the SPI bus to connect to the switch module; Each functional module uses an Ethernet cable to perform data interaction with the CPU module, and the switch module is used for unified data transceiver and scheduling.

2. The primary frequency modulation control device according to claim 1, characterized in that The power supply of other functional modules except the power supply module comes from the 24V and 5V power buses on the backplane; the power supply module provides voltage and current for the power buses.

3. The primary frequency modulation control device according to claim 1, characterized in that The CPU module uses an Allwinner A40i processor, and the processor is connected to the switch module through a 100M Ethernet; the CPU module integrates a 32-bit high-speed MCU, is connected to the analog acquisition AC module through the backplane, realizes the analog acquisition of voltage and current, calculates the frequency data, and sends it to the A40i processor through the bus.

4. The primary frequency modulation control device according to claim 1, wherein The switch module is composed of two BCM5338M chips connected in series, providing 18 Ethernet interfaces.

5. The primary frequency regulation control device according to claim 1, characterized in that, The analog acquisition AC module is connected to the CPU module through the backplane.

6. The primary frequency regulation control device according to claim 1, wherein The touch LCD module is located on the front panel of the chassis, uses a 7-inch capacitive touch screen, and is connected to the backplane of the chassis through Ethernet.

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