A Simulation Method and System for UHVDC Transmission Based on Dual Simulation Module Switching

Abstract

A simulation system and method for UHVDC transmission based on dual simulation module switching. The simulation system includes dual simulation modules, employing both electromechanical model simulation and PSCAD simulation modules to simulate the characteristics of AC / DC primary equipment and DC control and protection logic. A simulation monitoring backend provides a monitoring and operation interface for the DC system, displaying real-time equipment status and simulation results data, performing control functions on the DC system, and facilitating data interaction between the dual simulation modules via shared memory. The simulation method of this invention achieves a balance between simulation speed and fault simulation accuracy in UHVDC transmission simulation, meeting the needs of maintenance personnel for DC operation and fault simulation.

Description

Technical Field

[0001] This invention belongs to the field of power technology, specifically relating to a simulation method and system for ultra-high voltage direct current transmission based on dual simulation module switching. Background Technology

[0002] Currently, DC transmission lines primarily undertake the important task of transmitting electricity from west to east, playing a crucial role in grid interconnection. However, DC transmission also presents challenges such as complex control logic and the difficulty of mastering the technology. Careless operation, unfamiliarity with the system, or other reasons leading to a fault can trigger a chain reaction in the AC / DC system, posing a significant challenge to dispatching and severely impacting system stability.

[0003] Currently, DC simulation and fault simulation largely rely on RTDS (Real-time Digital Simulation System) or PSCAD. While RTDS simulation is fast and accurate, it is expensive and requires connection to actual control and protection devices, making it suitable for device testing. PSCAD (Power Systems Computer-Aided Design) runs on a PC and offers high simulation accuracy, but it is slow and takes a long time to complete, making it suitable for research. Neither of these methods is suitable for daily training simulations for DC converter station operators.

[0004] Prior art document 1 (CN110176779A) discloses a system and method for implementing UHVDC converter station simulation based on PSCAD. The system includes a substation simulation module for substation simulation; a calculation engine module connected to the substation simulation module, interacting with it via a shared memory interface; and a memory database connected to the substation simulation module for managing all real-time substation data. The shortcomings of prior art document 1 are: PSCAD uses electromagnetic transient simulation, resulting in detailed and complex simulation models that require long computation times, making it suitable only for DC fault simulation research. Using PSCAD for simulating routine DC control operations, power scaling, and other routine operations results in a poor user experience, requiring users to wait a long time for the simulation process before seeing the results for each step. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an ultra-high voltage direct current (UHVDC) transmission simulation method and system based on dual simulation module switching. This system aims to solve the problem of daily training simulation for DC converter station operators, providing rapid operational response and fault simulation capabilities to meet the needs of training and drills for maintenance personnel and to simulate faults.

[0006] The present invention adopts the following technical solution.

[0007] The UHVDC transmission simulation system based on dual simulation module switching includes: dual simulation modules and a simulation monitoring backend module. The dual simulation modules include: an electromechanical model simulation module, a PSCAD simulation module, a working condition identification and synchronization module, and a pre-stored typical working condition module.

[0008] The dual simulation module is connected to the runtime simulation monitoring backend module.

[0009] The dual simulation module is used to simulate the characteristics of DC primary equipment and DC control and protection logic. It is jointly implemented by the electromechanical model simulation module and the PSCAD simulation module, and the simulation data is output to the simulation monitoring backend module.

[0010] The working condition identification and synchronization module is connected to the electromechanical model simulation module at one end and to the PSCAD simulation module at the other end. The working condition identification and synchronization module is used to determine the current operating mode based on the number of dual-station dual-pole unlocking valve groups and wiring method obtained from the electromechanical model simulation module.

[0011] One end of the pre-stored typical operating condition module is connected to the operating condition identification and synchronization module, and the other end is connected to the PSCAD simulation module. When performing fault simulation, the pre-stored typical operating condition module loads the PSCAD SNAPSHOT file from the operating conditions pre-stored in the PSCAD simulation module according to the operating mode identified by the operating condition identification and synchronization module. The operating condition identification and synchronization module synchronizes the switch position, power control mode, voltage control mode and power / current command in the electromechanical simulation module to the PSCAD simulation module.

[0012] When the simulation system is in non-fault simulation mode, the electromechanical simulation module is activated, and the electromechanical model simulation module uses a DC electromechanical model for simulation.

[0013] When the simulation system is performing fault simulation, the PSCAD simulation module uses PSCAD electromagnetic transient simulation.

[0014] The simulation monitoring backend module provides a monitoring and operation interface for the UHVDC transmission simulation system, displays simulation results data in real time, and outputs backend commands to the dual simulation module. The backend commands include remote control commands for operating switches and remote adjustment commands for adjusting power, voltage, and current.

[0015] Preferably, it also includes a fault simulation button.

[0016] The fault simulation button is installed on the simulation monitoring backend and is used to switch between the electromechanical model simulation module and the PSCAD simulation module.

[0017] Preferably, the operating condition refers to the operating state of the DC system at a certain time segment, and the SNAPSHOT file is a file provided by PSCAD that holds all simulation data at a certain time segment;

[0018] Preferably, the PSCAD simulation module pre-stores SNAPSHOT files for N typical UHVDC wiring modes, where N is less than or equal to 45.

[0019] 50% of SNAPSHOT files are saved with a 0.1 pu unlock condition, and the remaining SNAPSHOT files are saved with a 1.0 pu unlock condition.

[0020] The PSCAD simulation module starts simulation calculations based on the power / current commands synchronized by the operating condition identification synchronization module. When the DC voltage and current obtained by its simulation calculations are consistent with the calculation results of the electromechanical simulation model, the simulation data synchronization is completed. At this time, the working simulation module has switched to the PSCAD simulation module to conduct fault simulation tests.

[0021] Preferably, the simulation monitoring backend module is consistent with the actual converter station monitoring backend module.

[0022] The UHVDC transmission simulation method based on dual simulation module switching includes the following steps:

[0023] Step 1: Run the simulation monitoring backend to operate the DC system;

[0024] Step 2: Select fault simulation through the simulation monitoring backend;

[0025] Step 3: The operating condition identification synchronization module reads the DC switch position and valve group unlocking status of the electromechanical simulation module to determine the operating mode of the UHVDC at this time.

[0026] Step 4: The operating condition identification and synchronization module selects the matching SNAPSHOT file based on the determined operating mode and loads it into the PSCAD simulation module.

[0027] Step 5: The operating condition identification and synchronization module reads the switch position, power control mode, voltage control mode, and power / current from the electromechanical simulation module and synchronizes them to the PSCAD simulation module.

[0028] Step 6: The PSCAD simulation module begins simulation calculations based on the SNAPSHOT file and the information synchronized from Step 5.

[0029] Step 7: The operating condition identification and synchronization module reads the calculation results of DC voltage and current from the PSCAD simulation module and compares them with the voltage and current calculated by the electromechanical simulation module. When the two values ​​are consistent, it is considered that the PSCAD simulation module has completed simulation synchronization and its operating condition is consistent with the electromechanical simulation operating condition.

[0030] Step 8: Once both simulation modules complete synchronously, the PSCAD simulation module can be used to conduct fault simulation tests.

[0031] A terminal includes a processor and a storage medium; wherein:

[0032] The storage medium is used to store instructions;

[0033] The processor is used to operate according to the instructions to execute the steps of the UHVDC transmission simulation method based on dual simulation module switching.

[0034] A computer-readable storage medium having a computer program thereon that, when executed by a processor, implements the steps of a simulation method for ultra-high voltage direct current transmission based on switching between dual simulation modules.

[0035] The beneficial effects of this invention are that, compared with the prior art,

[0036] This invention uses electromechanical simulation models to replace precise simulation calculations for scenarios such as routine DC operations. Electromechanical simulation is characterized by its relatively simple simulation model and fast simulation speed, making it suitable for simulations of routine operations. For DC fault simulations requiring precise simulation, the PSCAD simulation module is switched to achieve a balance between simulation speed and accuracy. This allows UHVDC transmission simulation to balance simulation speed and fault simulation accuracy, achieving a highly effective training outcome. Attached Figure Description

[0037] Figure 1 This is a structural diagram of the UHVDC transmission simulation system based on dual simulation module switching according to the present invention. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this invention.

[0039] Example 1.

[0040] like Figure 1 As shown, the UHVDC transmission simulation system based on dual simulation module switching includes: dual simulation modules, a running simulation monitoring backend module, and the dual simulation modules include: an electromechanical model simulation module and a PSCAD simulation module, a working condition identification and synchronization module, and a pre-stored typical working condition module.

[0041] The dual simulation module is connected to the runtime simulation monitoring backend module.

[0042] The dual simulation module is used to simulate the characteristics of DC primary equipment and DC control and protection logic. It is jointly implemented by the electromechanical model simulation module and the PSCAD simulation module, and the simulation data is output to the simulation monitoring backend module.

[0043] The working condition identification and synchronization module is connected to the electromechanical model simulation module at one end and to the PSCAD simulation module at the other end. The working condition identification and synchronization module is used to determine the current operating mode based on the number of dual-station dual-pole unlocking valve groups and wiring method obtained from the electromechanical model simulation module.

[0044] One end of the pre-stored typical operating condition module is connected to the operating condition identification and synchronization module, and the other end is connected to the PSCAD simulation module. When performing fault simulation, the pre-stored typical operating condition module loads the PSCAD SNAPSHOT file from the operating conditions pre-stored in the PSCAD simulation module according to the operating mode identified by the operating condition identification and synchronization module. The operating condition identification and synchronization module synchronizes the switch position, power control mode, voltage control mode and power / current command in the electromechanical simulation module to the PSCAD simulation module.

[0045] When the simulation system is in non-fault simulation mode, the electromechanical simulation module is activated, and the electromechanical model simulation module uses a DC electromechanical model for simulation.

[0046] When the simulation system is performing fault simulation, the PSCAD simulation module uses PSCAD electromagnetic transient simulation.

[0047] The simulation monitoring backend module provides a monitoring and operation interface for the UHVDC transmission simulation system, displays simulation results data in real time, and outputs backend commands to the dual simulation module; it also performs control functions for the DC system. The backend commands include remote control commands for operating switches and remote adjustment commands for adjusting power, voltage, and current.

[0048] In a preferred embodiment, the electromechanical model simulation module is used to perform simulation using a simplified DC electromechanical model, and the PSCAD simulation module uses PSCAD electromagnetic transient simulation.

[0049] In a preferred embodiment, the electromechanical simulation module operates during non-fault simulation, and a fault simulation button is provided. This fault simulation button is installed on the operation simulation monitoring backend and used to switch between the electromechanical model simulation module and the PSCAD simulation module. In a preferred embodiment, the PSCAD simulation module pre-stores SNAPSHOT files for 45 typical UHVDC wiring patterns, based on the UHVDC wiring configuration. To facilitate control mode and power synchronization, according to daily DC operation habits, 50% of the SNAPSHOT files are saved with a 0.1 pu unlock condition, and the remaining SNAPSHOT files are saved with a 1.0 pu unlock condition.

[0050] Among them, the operating condition refers to the operating state of the DC system at a certain time section, and the SNAPSHOT file is a file provided by PSCAD that keeps all simulation data at a certain time section.

[0051] 0.1pu refers to operating at 10% of rated power.

[0052] The operating condition identification and synchronization module is used to determine the current operating mode based on the number of unlocking valve groups in the dual-station dual-pole system and the wiring method.

[0053] In a preferred embodiment, after clicking the fault simulation button, the pre-stored typical operating condition module retrieves the corresponding SNAPSHOT file from the pre-stored operating conditions in the PSCAD simulation module according to the operating mode identified by the operating condition identification and synchronization module. After the operating conditions are loaded, the operating condition identification and synchronization module synchronizes the switch positions, power control modes, voltage control modes, and power / current commands from the electromechanical model simulation module to the PSCAD simulation module. The PSCAD simulation module starts simulation calculations based on the power / current commands synchronized from the operating condition identification and synchronization module. When the DC voltage and current obtained from its simulation calculations are consistent with the calculation results of the electromechanical simulation model, the simulation data synchronization is considered complete. At this point, the working simulation module has switched to the PSCAD simulation module, and fault simulation experiments can be performed.

[0054] In a preferred embodiment, the simulation monitoring backend is identical to the actual converter station monitoring backend module.

[0055] Example 2.

[0056] A simulation method for UHVDC transmission based on dual simulation module switching. It includes the following steps:

[0057] Step 1: Run the simulation monitoring backend to operate the DC system;

[0058] Step 2: Select fault simulation through the simulation monitoring backend;

[0059] Step 3: The operating condition identification synchronization module reads the DC switch position and valve group unlocking status of the electromechanical simulation module to determine the operating mode of the UHVDC at this time.

[0060] Step 4: The operating condition identification and synchronization module selects the matching SNAPSHOT file based on the determined operating mode and loads it into the PSCAD simulation module.

[0061] Step 5: The operating condition identification and synchronization module reads the switch position, power control mode, voltage control mode, and power / current from the electromechanical simulation module and synchronizes them to the PSCAD simulation module.

[0062] Step 6: The PSCAD simulation module begins simulation calculations based on the SNAPSHOT file and the information synchronized from Step 5.

[0063] Step 7: The operating condition identification and synchronization module reads the calculation results of DC voltage and current from the PSCAD simulation module and compares them with the voltage and current calculated by the electromechanical simulation module. When the two values ​​are consistent, it is considered that the PSCAD simulation module has completed simulation synchronization and its operating condition is consistent with the electromechanical simulation operating condition.

[0064] Step 8: Once both simulation modules complete synchronously, the PSCAD simulation module can be used to conduct fault simulation tests.

[0065] Example 3.

[0066] Embodiment 3 of the present invention provides a computer-readable storage medium.

[0067] A computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements the steps in the UHVDC transmission simulation method based on dual simulation module switching as described in Embodiment 2 of the present invention.

[0068] The detailed steps are the same as those of the UHVDC transmission simulation method based on dual simulation module switching provided in Example 2, and will not be repeated here.

[0069] Example 4.

[0070] Embodiment 4 of the present invention provides an electronic device.

[0071] An electronic device includes a memory, a processor, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps in the UHVDC transmission simulation method based on dual simulation module switching as described in Embodiment 1 of the present invention.

[0072] The detailed steps are the same as those of the UHVDC transmission simulation method based on dual simulation module switching provided in Example 2, and will not be repeated here.

[0073] The beneficial effects of this invention are that, compared with the prior art,

[0074] This invention uses electromechanical simulation models to replace precise simulation calculations for scenarios such as routine DC operations. Electromechanical simulation is characterized by its relatively simple simulation model and fast simulation speed, making it suitable for simulations of routine operations. For DC fault simulations requiring precise simulation, the PSCAD simulation module is switched to achieve a balance between simulation speed and accuracy. This allows UHVDC transmission simulation to balance simulation speed and fault simulation accuracy, achieving a highly effective training outcome. This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium loaded with computer-readable program instructions for causing a processor to implement various aspects of this disclosure.

[0075] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0076] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0077] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A UHVDC transmission simulation system based on dual simulation module switching, comprising: The dual simulation module, which runs a simulation monitoring backend module, is characterized by comprising: an electromechanical model simulation module, a PSCAD simulation module, a working condition identification and synchronization module, and a pre-stored typical working condition module. The dual simulation module is connected to the runtime simulation monitoring backend module. The dual simulation module is used to simulate the characteristics of DC primary equipment and DC control and protection logic. It is jointly implemented by the electromechanical model simulation module and the PSCAD simulation module, and the simulation data is output to the simulation monitoring backend module. The working condition identification and synchronization module is connected to the electromechanical model simulation module at one end and to the PSCAD simulation module at the other end. The working condition identification and synchronization module is used to determine the current operating mode based on the number of dual-station dual-pole unlocking valve groups and wiring method obtained from the electromechanical model simulation module. One end of the pre-stored typical operating condition module is connected to the operating condition identification and synchronization module, and the other end is connected to the PSCAD simulation module. When performing fault simulation, the pre-stored typical operating condition module loads the PSCAD SNAPSHOT file from the operating conditions pre-stored in the PSCAD simulation module according to the operating mode identified by the operating condition identification and synchronization module. The operating condition identification and synchronization module synchronizes the switch position, power control mode, voltage control mode, and power and current commands in the electromechanical simulation module to the PSCAD simulation module. When the simulation system is in non-fault simulation mode, the electromechanical simulation module is activated, and the electromechanical model simulation module uses a DC electromechanical model for simulation. When the simulation system is performing fault simulation, the PSCAD simulation module uses PSCAD electromagnetic transient simulation.

2. The UHVDC transmission simulation system based on dual simulation module switching according to claim 1, characterized in that, The simulation monitoring backend module provides a monitoring and operation interface for the UHVDC transmission simulation system, displays simulation results data in real time, and outputs backend commands to the dual simulation module. The backend commands include remote control commands for operating switches and remote adjustment commands for adjusting power, voltage, and current.

3. The UHVDC transmission simulation system based on dual simulation module switching according to claim 1, characterized in that, It also includes a fault simulation button. The fault simulation button is installed on the simulation monitoring backend and is used to switch between the electromechanical model simulation module and the PSCAD simulation module.

4. The UHVDC transmission simulation system based on dual simulation module switching according to claim 1, characterized in that, Operating conditions refer to the operating state of a DC system at a certain time segment. SNAPSHOT files are a type of file provided by PSCAD that stores all simulation data at a certain time segment. The PSCAD simulation module pre-stores SNAPSHOT files for N typical UHVDC wiring patterns, where N is less than or equal to 45.

5. The UHVDC transmission simulation system based on dual simulation module switching according to claim 4, characterized in that, 50% of SNAPSHOT files are saved with a 0.1 pu unlock condition, and the remaining SNAPSHOT files are saved with a 1.0 pu unlock condition.

6. The UHVDC transmission simulation system based on dual simulation module switching according to claim 1, characterized in that, The PSCAD simulation module starts simulation calculations based on the power / current commands synchronized by the operating condition identification synchronization module. When the DC voltage and current obtained by its simulation calculations are consistent with the calculation results of the electromechanical simulation model, the simulation data synchronization is completed. At this time, the working simulation module has switched to the PSCAD simulation module to conduct fault simulation tests.

7. The UHVDC transmission simulation system based on dual simulation module switching according to claim 1, characterized in that, The simulation monitoring backend module is consistent with the actual converter station monitoring backend module.

8. A UHVDC transmission simulation method based on dual simulation module switching, implemented using the system described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Run the simulation monitoring backend to operate the DC system; Step 2: Select fault simulation through the simulation monitoring backend; Step 3: The operating condition identification synchronization module reads the DC switch position and valve group unlocking status of the electromechanical simulation module to determine the operating mode of the UHVDC at this time. Step 4: The operating condition identification and synchronization module selects the matching SNAPSHOT file based on the determined operating mode and loads it into the PSCAD simulation module. Step 5: The operating condition identification and synchronization module reads the switch position, power control mode, voltage control mode, and power and current commands from the electromechanical simulation module and synchronizes them to the PSCAD simulation module. Step 6: The PSCAD simulation module begins simulation calculations based on the SNAPSHOT file and the information synchronized from Step 5. Step 7: The operating condition identification and synchronization module reads the calculation results of DC voltage and current from the PSCAD simulation module and compares them with the voltage and current calculated by the electromechanical simulation module. When the two values ​​are consistent, it is considered that the PSCAD simulation module has completed simulation synchronization and its operating condition is consistent with the electromechanical simulation operating condition. Step 8: Once both simulation modules complete synchronously, the PSCAD simulation module can be used to conduct fault simulation tests.

9. A terminal, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the UHVDC transmission simulation method based on dual simulation module switching as described in claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the UHVDC transmission simulation method based on dual simulation module switching as described in claim 8.

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