A flexible DC valve control full-link simulation test system

Abstract

A flexible DC valve control full-link simulation test system includes a simulator, a simulated high-potential screen and a pulse distribution screen for one arm of the flexible DC converter valve, a simplified pulse distribution screen for the remaining arms of the flexible DC converter valve, a valve control main screen, a pole control screen, and a monitoring background. The simulator is respectively connected to the simulated high-potential screen of one arm of the flexible DC converter valve and the simplified pulse distribution screen of the remaining arms of the flexible DC converter valve through optical fibers. The simulated high-potential screen and the pulse distribution screen of one arm of the flexible DC converter valve are connected through an optical fiber. The pulse distribution screen of one arm of the flexible DC converter valve and the simplified pulse distribution screen of the remaining arms of the flexible DC converter valve are respectively connected to the valve control main screen through optical fibers. The valve control main screen is connected to the pole control screen through an optical fiber. The monitoring background is connected to the valve control main screen and the pole control screen through network cables. The simulator is also respectively connected to the valve control main screen and the pole control screen through optical fibers. The present invention can reduce the required test hardware and wiring workload and shorten the test duration of the flexible DC project.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible DC valve control testing, and particularly relates to a flexible DC valve control full-link simulation test system. Background Art

[0002] The power system is the main carrier for energy utilization, transmission, and distribution, and plays an important role in the social economy. At the same time, in the power system, the grid connection and power generation of renewable energy, the power conversion of energy storage devices, the flexible interconnection of AC and DC power grids, the bidirectional flow of distribution and utilization electric energy, and the dynamic compensation of reactive power and harmonics all need to rely on power electronic devices to achieve. With the development of high-voltage and high-power power electronic devices, the improvement of the modularization, unitization, and intelligent level of converters, and the improvement of the performance of control strategies and modulation strategies, flexible DC transmission will play a greater role in the power system.

[0003] The flexible DC valve control is the "brain" of the flexible DC converter valve, and its normal operation is directly related to the safe and stable operation of the flexible DC converter valve. Therefore, during the development of the flexible DC converter valve, simulation tests are usually carried out on its control and protection system to verify the control and protection functions. Currently, the industry mainly conducts online simulation verification through simulators such as RTDS. This method can perform real-time simulation verification at the device level for the valve control, and is a relatively common verification method at present. In order to comprehensively verify the valve control system, a full-link structure is generally adopted, that is, the test system includes a valve control system consistent with the actual project. Due to the high voltage level and large number of sub-modules of the flexible DC converter valve, the number of boards and optical devices configured in the valve control system participating in the simulation test is very large, and the test wiring workload is huge, which not only causes a great waste of resources but also increases the construction period of test preparation. Summary of the Invention

[0004] The purpose of the present invention is to provide a flexible DC valve control full-link simulation test system for the problems in the above-mentioned existing technologies, which can reduce the required test hardware and wiring workload and shorten the test construction period of the flexible DC project without changing the verification function.

[0005] In order to achieve the above purpose, the present invention has the following technical solutions:

[0006] A flexible DC valve control full-link simulation test system includes a simulator, an analog high-potential screen and a pulse distribution screen for one arm of the flexible DC converter valve, a simplified pulse distribution screen for the remaining arms of the flexible DC converter valve, a valve control mainframe screen, a pole control screen, and a monitoring background. Among them, the simulator is respectively connected to the analog high-potential screen of one arm of the flexible DC converter valve and the simplified pulse distribution screen of the remaining arms of the flexible DC converter valve through optical fibers; the analog high-potential screen and the pulse distribution screen of one arm of the flexible DC converter valve are connected through an optical fiber; the pulse distribution screen of one arm of the flexible DC converter valve and the simplified pulse distribution screens of the remaining arms of the flexible DC converter valve are respectively connected to the valve control mainframe screen through optical fibers; the valve control mainframe screen is connected to the pole control screen through an optical fiber; the monitoring background is respectively connected to the valve control mainframe screen and the pole control screen through network cables; the simulator is also respectively connected to the valve control mainframe screen and the pole control screen through optical fibers.

[0007] As a preferred solution of the flexible DC valve control full-link simulation test system of the present invention, the simplified pulse distribution screen includes a power supply board, a pulse switching board, and a simulation interface board arranged inside the simplified pulse chassis.

[0008] The power supply board is used to supply power to other boards inside the chassis; the pulse switching board communicates with the valve control mainframe screen through an optical fiber and communicates with the simulation interface board through the backplane of the simplified pulse chassis; the simulation interface board communicates with the simulator through an optical fiber.

[0009] As a preferred solution of the flexible DC valve control full-link simulation test system of the present invention, two power supply boards are redundantly provided, and the two power supply boards are connected in parallel to supply power to other boards inside the chassis respectively.

[0010] As a preferred solution of the flexible DC valve control full-link simulation test system of the present invention, a plurality of pulse switching boards are provided, and the number is the same as the number of pulse switching boards used for one arm of the flexible DC converter valve in the actual project.

[0011] As a preferred solution of the flexible DC valve control full-link simulation test system of the present invention, the simulation interface board of the simplified pulse distribution screen is further configured with a delay module, and the link delay between the pulse distribution screen of one arm of the flexible DC converter valve and the simplified pulse distribution screens of the remaining arms of the flexible DC converter valve is made consistent through the delay module.

[0012] As a preferred solution of the flexible DC valve control full-link simulation test system of the present invention, the simplified pulse distribution screen equivalently replaces the corresponding functions of three chassis of the on-site flexible DC valve control through a chassis and its internal boards.

[0013] As a preferred solution of the flexible DC valve control full-link simulation test system of the present invention, the simulator is an FPGA simulator, and various faults of the sub-modules of the flexible DC converter valve are set online in the analog high-potential screen by the simulator.

[0014] As a preferred solution of the flexible DC valve control full-link simulation test system of the present invention, the analog high-potential screen receives the trigger pulses sent by the flexible DC valve control through the simulator, sends up the module voltage and fault status in the simulator, and online configures the voltage and specific fault status words of the specified flexible DC converter valve sub-module.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] The simulator is respectively connected to the analog high-potential screen of one arm of the flexible DC converter valve and the simplified pulse distribution screen of the remaining arms of the flexible DC converter valve through optical fibers. By dividing the arms of the flexible DC converter valve, an analog high-potential screen of one arm of the flexible DC converter valve and a simplified pulse distribution screen of the remaining arms of the flexible DC converter valve are set, and a pulse distribution screen is set after the analog high-potential screen of one arm. The test system adopts the on-site valve control configuration for this one arm, and all software and hardware are the same as those on-site. The simplified pulse distribution screens of the remaining arms adopt simplified configurations, and the functions realized by one chassis represent the functions of multiple chassis of the on-site valve control. Such a configuration method of the present invention ensures that at least one arm of the valve control has the same function configuration as on-site, and can test whether the functions of the VCMI chassis are correct. The test system of the present invention can realize the flexible DC valve control full-link simulation test function, and can significantly reduce the required test hardware and wiring workload and shorten the experimental period of the flexible DC project without changing the verification function.

[0017] Furthermore, the simplified pulse distribution screen of the present invention includes a power supply board, a pulse switching board and a simulation interface board arranged inside the simplified pulse chassis; wherein, the power supply board is used to supply power to other boards in the chassis, the pulse switching board communicates with the valve control main screen through optical fibers, the pulse switching board communicates with the simulation interface board through the backplane of the simplified pulse chassis, and the simulation interface board communicates with the simulator through optical fibers. The overall structure is simple, which can simplify and sort out the on-site pulse distribution screen, and can significantly reduce the required test hardware and wiring workload without changing the functions of the on-site pulse distribution screen. In addition, two power supply boards are redundantly set, and the two power supply boards are connected in parallel to supply power to other boards in the chassis respectively, which also improves the power supply reliability.

[0018] Furthermore, the simulation interface board of the simplified pulse distribution screen of the present invention is also configured with a delay module, which can make the link delay between the pulse distribution screen of one arm of the flexible DC converter valve and the simplified pulse distribution screens of the remaining arms of the flexible DC converter valve consistent, so as to verify the functions of the pulse distribution screen of the valve control, and further verify the module-level response of the valve control. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the structure of the flexible DC valve control full-link simulation test system in the embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the structure of the simplified pulse distribution chassis in the embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the valve control structure at the engineering site in the embodiment of the present invention;

[0023] Figure 4 Schematic diagram of the configuration of the simplified pulse distribution chassis designed for the valve control structure at the engineering site in the embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the configuration of the simulated high-potential chassis designed for the valve control structure at the engineering site in the embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the structure of the full-link simulation test system designed for the valve control structure at the engineering site in the embodiment of the present invention. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, rather than all, of the embodiments of the present invention.

[0027] Based on the embodiments of the present invention, those of ordinary skill in the art can also make several simple modifications and refinements without creative efforts. All other embodiments obtained shall fall within the scope of protection of the present invention.

[0028] Referring to "embodiments" in the present invention means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present invention. The phrase shown at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in the present invention can be combined with other embodiments.

[0029] For example, for the patent "A Full-link Simulation Device for a Flexible DC Converter Valve Control System" with the publication number CN202121121760, the existing full-link simulation device for a flexible DC converter valve control system can perform a complete simulation test on the full-link link of the flexible DC converter valve control through the setting of a pulse interface panel, obtaining more accurate simulation results.

[0030] However, the existing technologies represented by the technical solutions described in this patent still have many unsolvable technical problems in practical applications. Since flexible DC converter valves generally have a high voltage level and a large number of modules, the number of boards and optical devices configured in the control and protection systems participating in the simulation tests is very large, and the workload of test wiring is huge. This not only causes a great waste of resources but also increases the construction period of experiment preparation. Therefore, it is difficult to operate in actual projects. Taking the Luxi asynchronous networking flexible DC back-to-back project as an example, the number of sub-modules in a single bridge arm of the converter valve on the Guangxi side reaches 468, and the total number of modules is 2,808. The optical fiber distribution panel of the flexible DC valve control on the Guangxi side reaches 6, each panel cabinet contains 3 chassis, and each chassis contains 2 pulse switching boards and 13 trigger boards. If the simulation test system is completely configured according to the engineering site, the required resources will reach 36 chassis, 54 pulse switching boards, 468 trigger boards (including the corresponding analog high-potential panel cabinets), and 2,808 optical fibers and the corresponding wiring work.

[0031] By analyzing the actual requirements of the full-link simulation test, the present invention proposes an optimized full-link simulation test system for flexible DC valve control, as Figure 1 shown, including a simulator, an analog high-potential panel and a pulse distribution panel for one bridge arm of the flexible DC converter valve, a simplified pulse distribution panel for the remaining bridge arms of the flexible DC converter valve, a valve control mainframe panel, a pole control panel, and a monitoring background.

[0032] Among them, the simulator is respectively connected to the analog high-potential panel of one bridge arm of the flexible DC converter valve and the simplified pulse distribution panel of the remaining bridge arms of the flexible DC converter valve through optical fibers; the analog high-potential panel and the pulse distribution panel of one bridge arm of the flexible DC converter valve are connected through optical fibers; the pulse distribution panel of one bridge arm of the flexible DC converter valve and the simplified pulse distribution panel of the remaining bridge arms of the flexible DC converter valve are respectively connected to the valve control mainframe panel through optical fibers; the valve control mainframe panel is connected to the pole control panel through an optical fiber; the monitoring background is respectively connected to the valve control mainframe panel and the pole control panel through network cables; the simulator is also respectively connected to the valve control mainframe panel and the pole control panel through optical fibers.

[0033] See Figure 2 , in a possible implementation manner, the simplified pulse distribution panel includes a power supply board, a pulse switching board, and a simulation interface board arranged inside the simplified pulse chassis;

[0034] The power supply board is used to supply power to other boards inside the chassis; the pulse switching board communicates with the valve control mainframe screen via optical fiber and communicates with the simulation interface board via the simplified pulse chassis backplane; the simulation interface board communicates with the emulator via optical fiber.

[0035] Furthermore, two power supply boards are redundantly set up and are connected in parallel to supply power to other boards inside the chassis respectively. Multiple pulse switching boards are set up, and the quantity is the same as that of the pulse switching boards used in one flexible DC converter valve bridge arm in the actual project. The simplified pulse distribution screen replaces the corresponding functions of three chassis of the on-site flexible DC valve control through one chassis and its internal boards.

[0036] Furthermore, the simulation interface board of the simplified pulse distribution screen is also configured with a delay module to make the link delay between the pulse distribution screen of one bridge arm of the flexible DC converter valve and the simplified pulse distribution screens of the other bridge arms of the flexible DC converter valve consistent.

[0037] In a possible implementation manner, the emulator is an FPGA emulator, and the emulator online sets various faults of the sub-modules of the flexible DC converter valve in the simulated high-potential screen. The simulated high-potential screen receives the trigger pulses sent by the flexible DC valve control, sends up the module voltage and fault status in the emulator, and online configures the voltage and specific fault status word of the specified sub-module of the flexible DC converter valve.

[0038] See Figure 3 , taking the Luxi project as an example, the on-site valve control in Luxi adopts the dual-system hot standby redundancy method. The two sets of valve control systems and the two sets of converter control and protection systems correspond one by one and do not cross-redundancy. The valve control system of the engineering site in the embodiment of the present invention includes 2 valve control screens and 6 pulse distribution screens. The valve control screen A (VCMI-A screen) contains devices such as the valve control mainframe VCMI-A, the monitoring mainframe A, and the switch; the valve control screen B (VCMI-B screen) contains devices such as the valve control mainframe VCMI-B, the monitoring mainframe B, and the switch. The two sets of VCMI programs and hardware configurations are the same. The VCMI chassis contains a CPU board, an ACB board, an AFB board, an IO board, and a recording CPU board; each pulse distribution screen contains 3 pulse boxes (VGC). The programs and hardware configurations of all VGC chassis in the 6 pulse distribution screens are the same. The VGC chassis contains a pulse switching board and a trigger board.

[0039] The simplified pulse distribution chassis configuration and the simulated high-potential chassis configuration designed for the above-mentioned on-site valve control structure in the embodiment of the present invention are respectively as Figure 4 and Figure 5 shown. The simulated high-potential chassis is used to simulate the various functions of the corresponding sub-modules, such as triggering, module faults, etc. See Figure 6, in the full-link simulation test system structure designed for the valve control structure at the engineering site in the embodiments of the present invention, five of the valve control VGC chassis in the simulation laboratory adopt a simplified configuration (one chassis in this embodiment represents three chassis of the on-site valve control), and are directly connected to the RTDS (Real-Time Digital Simulator); the sixth valve control VGC chassis adopts the on-site valve control configuration, and all software and hardware are the same as those on-site, and is connected to the RTDS through the simulated high-potential chassis. The simulated high-potential chassis can receive the trigger pulses sent by the valve control, can send up the module voltage and fault status in the RTDS, and can simultaneously configure the voltage and specific fault status word of the specified module online. Such a configuration method ensures that at least one arm of the valve control has the same function configuration as that on-site, and can test whether the function of the VCMI chassis is correct. There are certain differences between the simulation test valve control and the on-site valve control, which are mainly reflected in that the simulation interface chassis is connected in the full-link arm of the valve control in the simulation test. The main function of the simulation interface chassis is to receive the trigger pulses by the analog module control board (PMC board), send up the module voltage and status, and communicate with the RTDS interface at the same time. The simulation interface chassis increases the link delay of this arm, but can verify the function of the pulse distribution screen of the valve control, and further verify the module-level response of the valve control. The programs and hardware configurations of the five VGC chassis with simplified configurations in the valve control of the simulation laboratory are the same; the programs and hardware configurations of the sixth VGC chassis with the on-site valve control configuration are the same as those on-site.

[0040] It can be seen that the optimized flexible DC valve control full-link simulation test system of the present invention can significantly reduce the required test hardware and wiring workload and shorten the experimental duration of the flexible DC project without changing the verification function.

[0041] The present invention has been described above in combination with specific features and their embodiments. Obviously, various modifications and combinations can be made to it without departing from the spirit and scope of the present invention. Correspondingly, this specification and the drawings are only exemplary descriptions of the present invention defined by the appended claims, and are considered to have covered any and all modifications, variations, combinations or equivalents within the scope of the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention, and these modifications and variations that do not depart from the spirit and scope of the present invention also fall within the scope of the claims of the present invention and their equivalent technologies.

Claims

1. A flexible DC valve-controlled full-link simulation test system, characterized in that, It includes an emulator, an analog high-potential screen and a pulse distribution screen for one arm of the flexible DC converter valve, a simplified pulse distribution screen for the remaining arms of the flexible DC converter valve, a valve control mainframe screen, a pole control screen, and a monitoring background; among them, the emulator is respectively connected to the analog high-potential screen of one arm of the flexible DC converter valve and the simplified pulse distribution screen of the remaining arms of the flexible DC converter valve through optical fibers; the analog high-potential screen and the pulse distribution screen of one arm of the flexible DC converter valve are connected through optical fibers; the pulse distribution screen of one arm of the flexible DC converter valve and the simplified pulse distribution screens of the remaining arms of the flexible DC converter valve are respectively connected to the valve control mainframe screen through optical fibers; the valve control mainframe screen is connected to the pole control screen through optical fibers; the monitoring background is respectively connected to the valve control mainframe screen and the pole control screen through network cables; the emulator is also respectively connected to the valve control mainframe screen and the pole control screen through optical fibers; It is divided by the arm of the flexible DC converter valve, an analog high-potential screen of one arm of the flexible DC converter valve is set, and a simplified pulse distribution screen of the remaining arms of the flexible DC converter valve is set, and a pulse distribution screen is set after the analog high-potential screen of one arm. The one arm adopts on-site valve control configuration, and all software and hardware are the same as those on-site. The simplified pulse distribution screens of the remaining arms adopt simplified configuration, and the functions realized by one chassis represent the functions of multiple chassis of on-site valve control; The valve control VGC chassis with simplified configuration in the simulation laboratory is directly connected to the real-time digital simulator RTDS, and the valve control VGC chassis with on-site valve control configuration is connected to the real-time digital simulator RTDS through an analog high-potential chassis; the analog high-potential chassis is used to simulate the functions of the corresponding sub-modules; In the valve control of the simulation laboratory, the program and hardware configuration of the valve control VGC chassis with simplified configuration are the same, and the program and hardware configuration of the valve control VGC chassis with on-site valve control configuration are the same as those on-site.

2. The flexible DC valve control full-link simulation test system according to claim 1, characterized in that, The simplified pulse distribution screen includes a power supply board, a pulse switching board, and a simulation interface board arranged inside the simplified pulse chassis; The power supply board is used to supply power to other boards in the chassis; The pulse switching board communicates with the valve control mainframe screen through optical fibers and communicates with the simulation interface board through the backplane of the simplified pulse chassis; The simulation interface board communicates with the emulator through optical fibers.

3. The flexible DC valve control full-link simulation test system according to claim 2, characterized in that Two power supply boards are redundantly set, and the two power supply boards are connected in parallel to supply power to other boards in the chassis respectively.

4. The flexible DC valve control full-link simulation test system according to claim 2, wherein A plurality of pulse switching boards are set, and the quantity is the same as the quantity of the pulse switching boards used by one arm of the flexible DC converter valve in the actual project.

5. The flexible DC valve control full-link simulation test system according to claim 2, characterized in that The simulation interface board of the simplified pulse distribution screen is also configured with a delay module, and the link delay between the pulse distribution screen of one arm of the flexible DC converter valve and the simplified pulse distribution screens of the remaining arms of the flexible DC converter valve is kept consistent through the delay module.

6. The flexible DC valve control full-link simulation test system according to claim 2, characterized in that The simplified pulse distribution screen equivalently replaces the corresponding functions of three chassis of the on-site flexible valve control through one chassis and its internal boards.

7. The flexible DC valve control full-link simulation test system according to claim 1, characterized in that The emulator is an FPGA emulator, and the emulator online sets various faults of the flexible DC converter valve sub-module in the analog high-potential screen.

8. The flexible DC valve control full-link simulation test system according to claim 7, wherein The analog high-potential screen receives the trigger pulses sent by the flexible valve control through the emulator, sends up the module voltage and fault status in the emulator, and online configures the voltage and specific fault status words of the specified flexible DC converter valve sub-module.

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