A control system and communication board for a UHV flexible DC transmission converter valve

Abstract

The present invention discloses a control system and a communication board for a UHV flexible DC transmission converter valve. The communication board includes an ARM chip and an FPGA chip which are communicatively connected. The FPGA chip is connected to a backplane interface through an LVDS interface. A 100-Mbps Ethernet interface, a first Gigabit Ethernet interface, and a second Gigabit Ethernet interface are connected to the ARM chip. The 100-Mbps Ethernet interface communicates with a local monitoring system through the IEC104 communication protocol, and the first Gigabit Ethernet interface and the second Gigabit Ethernet interface are connected to a remote monitoring system by using the IEC61850 communication protocol. It can implement the IEC104 communication protocol and the IEC61850 communication protocol, and can not only communicate with the local monitoring system through IEC104 for local monitoring, but also communicate with the remote monitoring system through IEC61850.

Description

Technical Field

[0001] The present invention belongs to the technical field of converter valve control systems, and particularly relates to a control system and a communication board for a UHV flexible DC transmission converter valve. Background Art

[0002] The UHV flexible DC transmission system is used for long-distance or ultra-long-distance power transmission. Compared with the traditional conventional DC transmission, the flexible DC transmission has the characteristics of independent decoupled control of active and reactive power, being able to supply power to passive networks, not requiring communication between converter stations, and being easy to form a multi-terminal DC system. Therefore, it has strong technical advantages in aspects such as island power supply, capacity expansion and transformation of urban distribution networks, interconnection of AC systems, and grid connection of large-scale wind farms.

[0003] The flexible DC transmission converter valve control system is one of the most important core devices in UHV flexible DC transmission equipment, which is used to control the reliable and stable operation of the flexible DC converter valve and ensure the safety of the converter valve. The control and status display of the converter valve control system are very important, so it is necessary to realize the communication function with the monitoring system.

[0004] When the communication board of the current converter valve control system communicates with the monitoring system, the main problems are as follows: First, when the communication board communicates with the monitoring system, it can only use the IEC104 communication protocol for communication and cannot realize IEC61850 communication; second, the communication board can only select to communicate with one of the local monitoring system or the remote monitoring system; third, it can only communicate with one set of remote monitoring systems and cannot perform redundant communication with two sets of remote monitoring systems.

[0005] For the above reasons, it is necessary to solve the problem of realizing simultaneous communication of IEC104 and IEC61850 with the monitoring system, not only communicating with one set of local monitoring systems, but also performing redundant communication with two sets of remote monitoring systems. Summary of the Invention

[0006] The present invention provides a control system and a communication board for a UHV flexible DC transmission converter valve, enabling the converter valve control system to communicate with the local monitoring system and the remote monitoring system simultaneously.

[0007] To achieve the above object, a communication board for a control system of a UHV flexible DC transmission converter valve according to the present invention includes an ARM chip and an FPGA chip connected by communication. The FPGA chip is connected to the backplane interface through an LVDS interface; a 100M Ethernet interface, a first Gigabit Ethernet interface, and a second Gigabit Ethernet interface are connected to the ARM chip; the 100M Ethernet interface communicates with the local monitoring system through the IEC104 communication protocol, and the first Gigabit Ethernet interface and the second Gigabit Ethernet interface are connected to the remote monitoring system using the IEC61850 communication protocol.

[0008] Further, an RTC real-time clock circuit is connected to the ARM chip.

[0009] Further, a Flash circuit is connected to the ARM chip.

[0010] Further, an SD card is connected to the ARM chip.

[0011] Further, an RS232 interface and a USB interface are connected to the ARM chip.

[0012] Further, both the ARM chip and the FPGA chip are connected to a power conversion circuit, and the power conversion circuit is used to supply power to the ARM chip and the FPGA chip.

[0013] Further, the FPGA chip is connected to a time-sharing optical fiber interface.

[0014] Further, an indicator light for indicating the communication status of EC104 and IEC61850 is connected to the FPGA chip.

[0015] A control system for a UHV flexible DC transmission converter valve includes two sets of valve control systems. Each set of converter valve control systems includes 1 converter valve control device and 1 set of local monitoring systems. The above-mentioned communication board is used in each converter valve control device. One of the gigabit Ethernet ports in the communication board communicates with the local monitoring system using IEC104, and the two gigabit Ethernet ports in the communication board communicate with the first remote monitoring system A and the remote monitoring system B using IEC61850 respectively.

[0016] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0017] 1) Adding multiple communication functions: It can implement the IEC104 communication protocol and the IEC61850 communication protocol. It can not only communicate with the local monitoring system using IEC104, but also communicate with the remote monitoring system through IEC61850.

[0018] 2) Increasing versatility: The communication board of the UHV flexible DC converter valve control system has multiple Ethernet ports. The gigabit Ethernet port can implement the IEC104 communication protocol and communicate with the local monitoring system, and the gigabit Ethernet port can implement the IEC61850 communication protocol and communicate redundantly with the remote monitoring system. It can choose to communicate with one of the monitoring systems or communicate with both monitoring systems at the same time.

[0019] 3) Reducing the number of communication boards: The communication board has two gigabit Ethernet ports, and one communication board can be used to communicate with both the local monitoring system and the remote monitoring system at the same time to achieve multiple functions.

[0020] 4) This communication board has good application prospects. In UHV flexible DC transmission, both IEC104 and IEC61850 are the most important communication protocols and means in the communication system. It can be used in some occasions that only require IEC104 communication or only mainly require IEC61850 communication. And when multiple monitoring systems are adopted, communication can also be achieved by connecting them simultaneously. This communication board uses the backplane communication method, and multiple communication boards can be inserted into the control chassis to realize the communication function with more monitoring devices. Compared with the existing communication boards, it has great improvements in versatility, redundancy ability, and flexibility. Brief Description of the Drawings

[0021] Figure 1 It is the principle block diagram of the communication board.

[0022] Figure 2 It is the schematic diagram of the communication interface between the converter valve control system and the monitoring system. Detailed Embodiment

[0023] In order to make the purpose and technical solutions of the present invention clearer and easier to understand. The following further details the present invention in conjunction with the drawings and embodiments. The specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] See Figure 1, the communication board of the control system of the UHV flexible DC converter valve of the present invention mainly includes: the present invention includes an ARM minimum system, an FPGA minimum system, a 100M Ethernet interface capable of implementing IEC104, two 1000M Ethernet interfaces capable of implementing IEC61850, a 12V power conversion circuit, a backplane interface, an RS232 interface, a USB interface, an LED light, a B-code time-synchronization optical fiber interface, an SD circuit, an RTC real-time clock circuit, a Flash circuit, etc.

[0026] The ARM chip and the FPGA chip are connected through the GPMC bus. The FPGA chip is connected to the LED light and the time-synchronization optical fiber interface. The FPGA chip is connected to the backplane interface through the LVDS interface; a 100M Ethernet interface, a first 1000M Ethernet interface, a second 1000M Ethernet interface, an RTC real-time clock circuit, a Flash circuit, an SD card, an RS232 interface, and a USB interface are connected to the ARM chip; the input end of the 12V power conversion circuit is connected to the backplane interface, and the output end is connected to the ARM chip and the FPGA chip.

[0027] The AM4379 series ARM chip and the EP4CE6E series FPGA chip are used to implement the peripheral function drive, logic processing, and communication control of the communication board. The RS232 interface and the USB interface implement the ARM debugging function of the communication board. The 100M network port uses the IEC104 communication protocol for communication with the local monitoring system. The two 1000M network ports implement the IEC61850 communication function for communication with two remote monitoring systems. The RTC circuit is used to display the real-time time. The SD card and the flash are used for the startup of the ARM operating system. The time-synchronization optical fiber interface is used for the B-code time-synchronization of the communication board. The FPGA controls 2 LED lights to respectively display the working state and communication state of the communication board. The 12V power supply provided by the backplane is converted and used to supply power to the communication board. The communication board address and data bus are connected to the backplane and communicate with the main control board card using LVDS.

[0028] See Figure 2 , the communication board of the control system of the flexible DC converter valve of the converter valve is mainly applied in the control system of the converter valve. The entire converter valve has two completely identical control systems that are redundant with each other. Each set of converter valve control systems includes 1 converter valve control device and 1 set of local monitoring systems. One communication board is used in each converter valve control device. One 100M network port in the communication board uses IEC104 communication with the local monitoring system. The two 1000M network ports in the communication board respectively use IEC61850 communication with remote monitoring system A and remote monitoring system B.

[0029] The communication board uploads the telecontrol and telemetry parameters transmitted by the converter valve control device to the local monitoring system through the IEC104 communication protocol, and the local monitoring system displays the telecontrol and telemetry parameters in real time. The communication board receives the remote control and remote adjustment commands issued by the local monitoring system. The converter valve control device will execute the remote control and remote adjustment commands and upload the execution results to the local monitoring system again through the communication board, and the local monitoring system will display the execution results of the remote control and remote adjustment.

[0030] The communication board uploads the telecontrol and telemetry parameters transmitted by the converter valve control device to two sets of remote monitoring systems simultaneously through the IEC61850 communication protocol, and the remote monitoring systems display the telecontrol and telemetry data in real time. The communication board receives the remote control and remote adjustment commands issued by the remote monitoring systems respectively. The converter valve control device will execute the remote control and remote adjustment commands issued by the two sets of remote monitoring systems, that is, the two sets of remote monitoring systems can control simultaneously. The converter valve control device uploads the execution results to the local monitoring system again through the communication board, and the two sets of remote monitoring systems will display the execution results of the remote control and remote adjustment.

[0031] The specific functions of the communication board of the UHV flexible DC converter valve control system are described in detail as follows:

[0032] 1) IEC104 communication function

[0033] The communication board of the UHV flexible DC converter valve control system has multiple Ethernet interfaces. One of the 100M Ethernet interfaces uses the IEC104 communication protocol to achieve communication with the local monitoring system using IEC104. The communication board uploads the telemetry and telecontrol data in the converter valve control system to the local monitoring system, and receives the remote control and remote adjustment instructions issued by the local monitoring system, and transmits them to the main control board of the converter valve control system through the backplane for execution, and uploads the execution results to the local monitoring system. When the IEC104 communication fails, the corresponding LED light shows red, and when the communication is normal, it shows green.

[0034] 2) IEC61850 communication function

[0035] Two of the Gigabit Ethernet interfaces in the communication board of the UHV flexible DC converter valve control system use the IEC61850 communication protocol to achieve communication with the remote monitoring system using IEC61850. The communication board uploads the telemetry and telecontrol data in the converter valve control system to two sets of remote monitoring systems simultaneously, and receives the remote control and remote adjustment instructions issued by the two sets of remote monitoring systems respectively, and transmits them to the main control board of the converter valve control system through the backplane for execution, and uploads the execution results to the two sets of remote monitoring systems simultaneously. When the IEC61850 communication fails, the corresponding LED light shows red, and when the communication is normal, it shows green.

[0036] 3) Other functions

[0037] The communication board of the UHV flexible DC converter valve control system also has the functions of B-code time synchronization, RTC real-time clock, RS232 debugging function and USB debugging function, and adopts the backplane communication function with the main control board of the converter valve control system.

[0038] This communication board has good application prospects. In UHV flexible DC power transmission, both IEC104 and IEC61850 are the most important communication protocols and means in the communication system. It can be used in some occasions that only require IEC104 communication or only mainly require IEC61850 communication. And when multiple monitoring systems are adopted, communication can also be realized by connecting simultaneously. This communication board adopts the backplane communication method, and multiple communication boards can be inserted in the control chassis to realize the communication function with more monitoring devices. Compared with the existing communication boards, it has great improvements in versatility, redundancy ability and flexibility.

[0039] The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A communication board for a control system of a UHV flexible DC transmission converter valve, characterized in that, It includes an ARM chip and an FPGA chip connected by communication. The FPGA chip is connected to the backplane interface through an LVDS interface; a 100M Ethernet interface, a first Gigabit Ethernet interface, and a second Gigabit Ethernet interface are connected to the ARM chip; the 100M Ethernet interface communicates with the local monitoring system through the IEC104 communication protocol, and the first Gigabit Ethernet interface and the second Gigabit Ethernet interface are connected to the remote monitoring system using the IEC61850 communication protocol; An RTC real-time clock circuit is connected to the ARM chip; The FPGA chip is connected to the optical fiber interface for time alignment.

2. The communication board of the control system of a UHV flexible DC transmission converter valve according to claim 1, wherein A Flash circuit is connected to the ARM chip.

3. The communication board of the control system of a UHV flexible DC transmission converter valve according to claim 1, characterized in that, An SD card is connected to the ARM chip.

4. The communication board of the control system for a UHV flexible DC transmission converter valve according to claim 1, wherein An RS232 interface and a USB interface are connected to the ARM chip.

5. The communication board of a control system for a UHV flexible DC transmission converter valve according to claim 1, characterized in that, Both the ARM chip and the FPGA chip are connected to a power conversion circuit, and the power conversion circuit is used to supply power to the ARM chip and the FPGA chip.

6. The communication board of a control system for a UHV flexible DC transmission converter valve according to claim 1, characterized in that, An indicator light for indicating the EC104 communication and IEC61850 communication status is connected to the FPGA chip.

7. A control system for a UHV flexible DC transmission converter valve, characterized in that, It includes two sets of valve control systems. Each converter valve control system contains 1 converter valve control device and 1 set of local monitoring systems. One communication board as described in any one of claims 1-6 is used in each converter valve control device. One 100M network port in the communication board communicates with the local monitoring system using the IEC104 communication protocol, and the two Gigabit network ports in the communication board communicate with the first remote monitoring system A and the remote monitoring system B respectively using the IEC61850 communication protocol.

Images