Implementation Method and System for Real-Time Electromagnetic Transient Simulation of AC / DC Power Grids across Platforms

Abstract

The present invention discloses a method and system for realizing real-time electromagnetic transient simulation of AC-DC power grids across platforms. Among them, the method includes: configuring a decoupled interface model for cross-platform simulation; generating a networked HVDC transmission system model for cross-region networked simulation based on the configured decoupled interface model; using the networked HVDC transmission system model to verify whether the performance of the decoupled interface model meets the requirements; after the performance of the decoupled interface model meets the requirements, using the decoupled interface model to divide the rectifier side and the inverter side of the networked HVDC transmission system to obtain two regional power grid models for cross-region asynchronous networking; starting the two regional power grid models for cross-region asynchronous networking according to the pre-set start rules; and establishing the steady state of the two regional power grid models for cross-region asynchronous networking according to the pre-set steady state establishment rules.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic transient real-time simulation of large-scale power grids, and more specifically, to a method and system for realizing cross-platform electromagnetic transient real-time simulation of AC-DC power grids, as well as a storage medium and an electronic device. Background Art

[0002] With the development of UHV DC transmission technology, cross-regional asynchronous networking has become a typical feature of domestic power grids. The increase in large-capacity DC projects and the emergence of multi-DC landing areas have caused profound changes in the stability characteristics of large power grids. On the basis of the operating characteristics of traditional AC systems, new characteristics such as the mutual coupling between AC and DC, between multiple DCs, and the mutual influence between DC sending and receiving ends have gradually emerged, and have become increasingly complex with the increase in DC transmission scale, and have become the key factors affecting the safety and stability of large power grids.

[0003] The changes in grid characteristics have put forward higher requirements for simulation technology. The traditional electromechanical transient simulation used for large power grid stability analysis can no longer meet the needs. The demand for electromagnetic transient simulation has changed from local grid equipment-level simulation research to system-level simulation research on the operating characteristics of large-scale AC-DC hybrid power grids, and it is necessary to finely simulate the influence characteristics between AC and DC, multiple DCs, and regional power grids. The new generation of digital-analog hybrid simulation platform of the State Grid Simulation Center has realized the digital-analog hybrid real-time simulation technology of regional power grids. The simulation scale can meet the simulation needs of any regional power grid, and can reach 6,000 three-phase nodes at a simulation step of 50 microseconds, and simultaneously access 10 DC control and protection devices. However, restricted by the maximum parallel computing power of super parallel computers, on the premise of ensuring simulation accuracy, the digital-analog hybrid simulation scale based on a single super parallel computer cannot be further expanded, and multi-region simulation cannot be carried out, so the interaction characteristics of cross-regional power grids under asynchronous networking cannot be finely simulated. There is an urgent need to study new technical means to realize the digital-analog hybrid real-time simulation of cross-regional power grids.

[0004] Aiming at the technical problem in the above-mentioned existing technology that cross-regional electromagnetic transient real-time simulation of AC-DC power grids cannot be carried out, no effective solution has been proposed yet. Summary of the Invention

[0005] Aiming at the technical problem in the existing technology that cross-regional electromagnetic transient real-time simulation of AC-DC power grids cannot be carried out, the present invention provides a method and system for realizing cross-platform electromagnetic transient real-time simulation of AC-DC power grids, including:

[0006] Configure the decoupling interface model for cross-platform simulation;

[0007] Based on the configured decoupling interface model, generate a networked DC transmission system model for cross-region networking simulation;

[0008] Verify whether the performance of the decoupling interface model meets the requirements by using the model of the interconnected HVDC system;

[0009] After the performance of the decoupling interface model meets the requirements, use the decoupling interface model to divide the rectifier side and the inverter side of the interconnected HVDC system to obtain two regional power grid models for asynchronous interconnection across regions;

[0010] Start the two regional power grid models for asynchronous interconnection across regions according to the pre-set start rules;

[0011] Establish the steady state of the two regional power grid models for asynchronous interconnection across regions according to the pre-set steady state establishment rules.

[0012] Optionally, configure the decoupling interface model for cross-platform simulation, including:

[0013] Design the interface circuit configuration parameters based on the line parameters of the interconnected HVDC project;

[0014] Set the minimum error of the steady state and the fault simulation results at both ends of the DC line as the goal;

[0015] Optimize the position and length of the decoupling interface model embedded in the DC transmission line.

[0016] Optionally, based on the configured decoupling interface model, generate the model of the interconnected HVDC system for cross-region interconnection simulation, including:

[0017] Build the DC transmission system for cross-region interconnection according to the actual project to generate the DC line model;

[0018] Connect the actual control and protection devices to the DC line model;

[0019] Connect the decoupling interface model to a certain length in the middle position of the DC line model, and connect lines related to frequency to both ends of the DC line model, so as to generate the model of the interconnected HVDC system for cross-region interconnection simulation.

[0020] Optionally, start the two regional power grid models for asynchronous interconnection across regions according to the pre-set start rules, including:

[0021] Run the two regional power grid models for asynchronous interconnection across regions on two supercomputer platforms respectively;

[0022] Design the communication channels of the interface measuring points and set the main and auxiliary system levels;

[0023] First start the regional power grid model on the supercomputer platform running in the main system, and then start the regional power grid model on the supercomputer platform running in the auxiliary system until the two regional power grid models for asynchronous interconnection across regions are successfully started.

[0024] Optionally, before starting the regional power grid model running on the supercomputer platform of the main system and then starting the regional power grid model running on the supercomputer platform of the auxiliary system, it includes:

[0025] Perform off-line power flow calculations on the two regional power grid models for cross-regional asynchronous interconnection respectively. After verifying that the power flow calculation results are correct, use the generator steady-state calculation values as the startup initial values for the corresponding regional power grid models;

[0026] Map and allocate the CPU tasks of the two supercomputer platforms to balance the CPU loads of each supercomputer platform.

[0027] Optionally, start the regional power grid model running on the supercomputer platform of the main system first, and then start the regional power grid model running on the supercomputer platform of the auxiliary system until the two regional power grid models for cross-regional asynchronous interconnection are successfully started, including:

[0028] Start the regional power grid model running on the supercomputer platform of the main system first, and check for persistent timeout overflows. If there is an overflow, continue to adjust until the real-time requirements are met;

[0029] When the previously started regional power grid model meets the real-time requirements, start the regional power grid model running on the supercomputer platform of the auxiliary system, and check for persistent timeout overflows. If there is an overflow, continue to adjust until the real-time requirements are met;

[0030] When the subsequently started regional power grid models all meet the real-time requirements, detect whether the waveform power flows of the two regional power grid models are correct;

[0031] When the waveform power flows of the two regional power grid models are both correct, determine that the startup of the two regional power grid models for cross-regional asynchronous interconnection is successful.

[0032] Optionally, according to the pre-set steady-state establishment rules, establish the steady state of the two regional power grid models for cross-regional asynchronous interconnection, including:

[0033] Switch the generators of the two regional power grid models for cross-regional asynchronous interconnection to an external control system;

[0034] First, unlock the non-interconnected direct currents in the two regional power grid models respectively, and then unlock the DC transmission systems used for interconnection in the two regional power grid models;

[0035] After the AC-DC systems in the two regional power grid models for cross-regional asynchronous interconnection operate stably, restore the limit values of the damping coefficients and frequency control upper and lower limits of the generators to actual values, thus completing the steady-state establishment of the two regional power grid models for cross-regional asynchronous interconnection.

[0036] According to another aspect of the present invention, there is provided a system for realizing real-time electromagnetic transient simulation of AC-DC power grids across platforms, including:

[0037] A configuration module for configuring the decoupling interface model for cross-platform simulation;

[0038] A networked HVDC system model generation module for generating a networked HVDC system model for cross-region networked simulation based on the configured decoupling interface model;

[0039] A performance verification module for verifying whether the performance of the decoupling interface model meets the requirements by using the networked HVDC system model;

[0040] A regional power grid model generation module for splitting the rectifier side and the inverter side of the networked HVDC system by using the decoupling interface model after the performance of the decoupling interface model meets the requirements to obtain two regional power grid models for cross-region asynchronous networking;

[0041] A regional power grid model startup module for starting two regional power grid models for cross-region asynchronous networking according to pre-set startup rules;

[0042] A steady-state establishment module for establishing the steady state of two regional power grid models for cross-region asynchronous networking according to pre-set steady-state establishment rules.

[0043] Optionally, the configuration module is specifically used for:

[0044] Designing interface circuit configuration parameters based on the line parameters of the networked HVDC project;

[0045] Setting the minimum error of the steady-state and fault simulation results at both ends of the DC line as the target;

[0046] Optimizing the position and length of the decoupling interface model embedded in the DC transmission line.

[0047] Optionally, the networked HVDC system model generation module is specifically used for:

[0048] Building a cross-region networked HVDC system according to the actual project to generate a DC line model;

[0049] Connecting actual control and protection devices to the DC line model;

[0050] Connecting the decoupling interface model to a certain length in the middle position of the DC line model, and connecting lines related to frequency to both ends of the DC line model, thereby generating a networked HVDC system model for cross-region networked simulation.

[0051] Optionally, the regional power grid model startup module is specifically used for:

[0052] Run the two regional power grid models for cross - regional asynchronous networking on two supercomputer platforms respectively;

[0053] Design the communication channels for the interface measurement points and set the primary and secondary system levels;

[0054] First start the regional power grid model on the supercomputer platform running in the primary system, and then start the regional power grid model on the supercomputer platform running in the secondary system until the two regional power grid models for cross - regional asynchronous networking are successfully started.

[0055] Optionally, the regional power grid model startup module is also specifically used for:

[0056] Conduct off - line power flow calculations for the two regional power grid models for cross - regional asynchronous networking respectively. After verifying that the power flow calculation results are correct, use the generator steady - state calculation values as the startup initial values for the corresponding regional power grid models;

[0057] Map and allocate the CPU tasks of the two supercomputer platforms to make the CPU load of each supercomputer platform balanced.

[0058] Optionally, the regional power grid model startup module is also specifically used for:

[0059] First start the regional power grid model on the supercomputer platform running in the primary system and check for persistent timeout overflows. If there are overflows, continue to adjust until the real - time requirements are met;

[0060] When the first - started regional power grid model meets the real - time requirements, start the regional power grid model on the supercomputer platform running in the secondary system and check for persistent timeout overflows. If there are overflows, continue to adjust until the real - time requirements are met;

[0061] When the later - started regional power grid models all meet the real - time requirements, detect whether the waveform power flow of the two regional power grid models is correct;

[0062] When the waveform power flow of the two regional power grid models is correct, determine that the two regional power grid models for cross - regional asynchronous networking are successfully started.

[0063] Optionally, the steady - state establishment module is specifically used for:

[0064] Switch the generators of the two regional power grid models for cross - regional asynchronous networking to an external control system;

[0065] First unlock the non - networking direct currents within the two regional power grid models respectively, and then unlock the DC transmission systems for networking within the two regional power grid models;

[0066] After the AC-DC system in the two regional power grid models of cross-regional asynchronous interconnection operates stably, the damping coefficient of the generator and the upper and lower limits of the frequency control are restored to the actual values, thus completing the establishment of the steady state of the two regional power grid models of cross-regional asynchronous interconnection.

[0067] According to another aspect of the present invention, there is provided a computer-readable storage medium storing a computer program for executing the method described in any of the above aspects of the present invention.

[0068] According to another aspect of the present invention, there is provided an electronic device including: a processor; a memory for storing executable instructions of the processor; and the processor for reading the executable instructions from the memory and executing the instructions to implement the method described in any of the above aspects of the present invention.

[0069] Thus, based on the principle of decoupling of power grid transmission lines, the present invention uses the DC transmission line of cross-regional interconnection as an interface decoupling model, designs and develops a special data transmission and synchronization scheme, and realizes the electromagnetic transient real-time simulation of two asynchronous interconnected regional power grids based on two supercomputers and corresponding interfaces, with the simulation scale reaching more than 10,000 three-phase nodes. Thus, based on the existing large-scale power grid electromagnetic transient real-time simulation ability, the present invention doubles the simulation scale to realize the electromagnetic transient real-time simulation of cross-platform AC-DC power grids. And, the joint simulation of cross-regional power grids is realized according to the steps provided by the present invention, the system can quickly enter the stable state and has the test conditions, and the simulation research on the AC-DC interaction between regional power grids can be further carried out. Description of the Drawings

[0070] By referring to the following drawings, the exemplary embodiments of the present invention can be more completely understood:

[0071] Figure 1 is a schematic flowchart of a method for realizing electromagnetic transient real-time simulation of cross-platform AC-DC power grids provided by an exemplary embodiment of the present invention;

[0072] Figure 2 is a schematic overall flowchart of the implementation process of electromagnetic transient real-time simulation of cross-platform AC-DC power grids provided by an exemplary embodiment of the present invention;

[0073] Figure 3 is a schematic structural diagram of a system for realizing electromagnetic transient real-time simulation of cross-platform AC-DC power grids provided by an exemplary embodiment of the present invention; and

[0074] Figure 4 is the structure of an electronic device provided by an exemplary embodiment of the present invention. Detailed Embodiments

[0075] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments of the present invention. It should be understood that the present invention is not limited by the exemplary embodiments described herein.

[0076] It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention.

[0077] Those skilled in the art can understand that terms such as "first", "second", etc. in the embodiments of the present invention are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate an inevitable logical order between them.

[0078] It should also be understood that in the embodiments of the present invention, "a plurality of" may mean two or more, and "at least one" may mean one, two or more.

[0079] It should also be understood that for any component, data or structure mentioned in the embodiments of the present invention, unless otherwise clearly defined or given a contrary indication in the context, it is generally understood to be one or more.

[0080] In addition, the term "and / or" in the present invention is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the associated objects before and after.

[0081] It should also be understood that the present invention emphasizes the differences between the various embodiments. The same or similar parts can be referred to each other. For the sake of brevity, they will not be described one by one.

[0082] At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0083] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present invention or its application or use.

[0084] Known technologies, methods and devices of those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technologies, methods and devices should be regarded as part of the specification.

[0085] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0086] Embodiments of the present invention can be applied to electronic devices such as terminal devices, computer systems, servers, etc., which can operate together with many other general or special computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, servers, etc. include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, minicomputer systems, mainframe computer systems, and distributed cloud computing technology environments including any of the above systems, and so on.

[0087] Terminal devices, computer systems, servers and other electronic devices can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Generally, program modules can include routines, programs, target programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. The computer system / server can be implemented in a distributed cloud computing environment where tasks are executed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media including storage devices.

[0088] Exemplary method

[0089] Figure 1 It is a schematic flowchart of an implementation method for cross-platform AC-DC power grid electromagnetic transient real-time simulation provided by an exemplary embodiment of the present invention. This embodiment can be applied to an electronic device, such as Figure 1 As shown, the implementation method 100 for cross-platform AC-DC power grid electromagnetic transient real-time simulation includes the following steps:

[0090] Step 101, configure the decoupling interface model for cross-platform simulation.

[0091] Optionally, configuring the decoupling interface model for cross-platform simulation includes: designing interface circuit configuration parameters based on the line parameters of the interconnected DC project; setting the minimum error of the steady-state and fault simulation results at both ends of the DC line as the target; optimizing the position and length of the decoupling interface model embedded in the DC transmission line.

[0092] Step 102, generate an interconnected DC power transmission system model for cross-region interconnected simulation based on the configured decoupling interface model.

[0093] Optionally, based on the configured decoupling interface model, a networked HVDC transmission system model for cross-region network simulation is generated, including: building an HVDC transmission system for cross-region networking according to the actual project to generate an HVDC line model; connecting actual control and protection devices to the HVDC line model; connecting the decoupling interface model to a certain length in the middle position of the HVDC line model, and connecting lines related to frequency to both ends of the remaining part of the HVDC line model, so as to generate a networked HVDC transmission system model for cross-region network simulation.

[0094] Among them, except for 200 km in the middle position of the HVDC line model for the decoupling interface model, frequency-related line types are used at both ends of the remaining part.

[0095] In the embodiment of the present invention, as shown in Figure 2 After the joint simulation decoupling interface model is configured, based on the configured decoupling interface model, interface hardware connection is performed to realize the networked HVDC transmission system for simulation modeling across regions. In the case where the networked HVDC transmission system across regions fails to be simulated successfully, it is also necessary to reconfigure the joint simulation decoupling interface model and re-perform the interface hardware connection until the networked HVDC transmission system across regions is simulated successfully. Moreover, the present invention effectively improves its simulation accuracy by connecting the control and protection devices of the in-service HVDC (for example, the control and protection devices of 17 HVDCs) to the HVDC line model.

[0096] Step 103: Use the networked HVDC transmission system model to verify whether the performance of the decoupling interface model meets the requirements;

[0097] Step 104: After the performance of the decoupling interface model meets the requirements, use the decoupling interface model to divide the rectifier side and the inverter side of the networked HVDC transmission system to obtain two regional power grid models for cross-region asynchronous networking.

[0098] Step 105: Start the two regional power grid models for cross-region asynchronous networking according to the preset start rules.

[0099] Optionally, starting the two regional power grid models for cross-region asynchronous networking according to the preset start rules includes: running the two regional power grid models for cross-region asynchronous networking on two supercomputer platforms respectively; designing the communication channels of the interface measurement points and setting the main and auxiliary system levels; first starting the regional power grid model running on the supercomputer platform of the main system, and then starting the regional power grid model running on the supercomputer platform of the auxiliary system until the two regional power grid models for cross-region asynchronous networking are successfully started.

[0100] Optionally, before starting the regional power grid model running on the supercomputer platform of the primary system and then starting the regional power grid model running on the supercomputer platform of the secondary system, it includes: performing off-line power flow calculations on the two regional power grid models of the inter-regional asynchronous interconnection respectively, and after verifying that the power flow calculation results are correct, taking the generator steady-state calculation value as the start initial value of the corresponding regional power grid model; mapping and allocating the CPU tasks of the two supercomputer platforms to make the CPU load of each supercomputer platform balanced.

[0101] Optionally, start the regional power grid model running on the supercomputer platform of the primary system first, and then start the regional power grid model running on the supercomputer platform of the secondary system until the two regional power grid models of the inter-regional asynchronous interconnection are successfully started, including: first start the regional power grid model running on the supercomputer platform of the primary system, and check whether there is a continuous timeout overflow. If there is an overflow, continue to adjust until the real-time requirements are met; when the first-started regional power grid model meets the real-time requirements, then start the regional power grid model running on the supercomputer platform of the secondary system, and check whether there is a continuous timeout overflow. If there is an overflow, continue to adjust until the real-time requirements are met; when the later-started regional power grid models all meet the real-time requirements, detect whether the waveform power flow of the two regional power grid models is correct; when the waveform power flow of the two regional power grid models is correct, determine that the two regional power grid models of the inter-regional asynchronous interconnection are successfully started.

[0102] In the embodiment of the present invention, as shown in Figure 2 After the simulation modeling of the interconnected HVDC transmission system for inter-regional networking is successful, use the interconnected HVDC transmission system model to verify whether the performance of the decoupling interface model meets the requirements, and after the performance of the decoupling interface model meets the requirements, use the decoupling interface model to split the rectifier side and the inverter side of the inter-regional power grid model to obtain two regional power grid models of the inter-regional asynchronous interconnection. After that, it is necessary to start the two obtained regional power grid models. The specific model start steps are as follows:

[0103] 1) Run the rectifier side and the inverter side of the inter-regional power grid model split by the decoupling interface model on two supercomputer platforms respectively, design the communication channels of the interface measurement points, and set the primary and secondary system levels.

[0104] 2) AC power grid initialization

[0105] To ensure the rapid establishment of the steady state of the large-scale inter-regional interconnected power grid joint simulation, the two regional power grid models need to perform off-line power flow calculations respectively. The HVDC transmission system does not participate in the power flow calculation process. After verifying that the power flow calculation results are correct, take the generator steady-state calculation value as its start initial value.

[0106] 3) CPU task mapping and allocation

[0107] To achieve co-simulation, both platforms must meet the real-time requirements. Before startup, the mapping of CPU tasks on the two supercomputer platforms should consider reasonable communication time reserved for CPU-to-CPU communication and interface communication, and appropriately adjust the load rate so that the burden on each CPU is not too heavy.

[0108] 4) Co-simulation startup

[0109] To ensure the successful startup of co-simulation for the two platforms, first, it is necessary to start the regional power grid model connected to the main system interface device, that is, start the regional power grid model on the supercomputer platform of the main system, and check for persistent timeout overflows. If there are overflows, continue to adjust until the real-time requirements are met. Then, start the regional power grid model connected to the auxiliary system interface device, that is, start the regional power grid model on the supercomputer platform of the auxiliary system, and check for persistent timeout overflows. If there are overflows, continue to adjust until the real-time requirements are met.

[0110] 5) After detecting that the analog quantities of the decoupling interface transmission system and the DC control and protection system are correct, it is proved that the waveform power flow is correct, unlock the DC, and the DC transmission system operates normally, indicating that the co-simulation startup is successful.

[0111] Step 106: According to the pre-set steady-state establishment rules, establish the steady state of the two regional power grid models with cross-regional asynchronous interconnection.

[0112] Optionally, according to the pre-set steady-state establishment rules, establishing the steady state of the two regional power grid models with cross-regional asynchronous interconnection includes: switching the generators of the two regional power grid models with cross-regional asynchronous interconnection to an external control system; first unlocking the non-networked DCs within the two regional power grid models respectively, and then unlocking the DC transmission systems used for networking within the two regional power grid models; after the AC-DC systems within the two regional power grid models with cross-regional asynchronous interconnection operate stably, restoring the limit values of the damping coefficient and the upper and lower limits of frequency control of the generators to actual values, thus completing the steady-state establishment of the two regional power grid models with cross-regional asynchronous interconnection.

[0113] In the embodiment of the present invention, as shown in Figure 2 After the co-simulation startup is successful, it is also necessary to establish the steady state of the two regional power grid models with cross-regional asynchronous interconnection. The specific steady-state establishment steps are as follows:

[0114] 1) Switching of the actual generator control system

[0115] After the co-simulation startup, the two regional power grid models running on the two supercomputer platforms can respectively perform the switching of the actual generator control system.

[0116] 2) Unlocking of the DC system of the interconnected power grid

[0117] First, unlock the non-networked direct currents in the two regional grid models separately, and then unlock the DC transmission system for networking to reduce the impact on the two systems during the unlocking process and confirm the stable operation of the AC-DC system.

[0118] 3) Steady-state establishment

[0119] The acquisition system operates normally and the waveform results are correct. Restore the upper and lower limit values of the generator damping coefficient and frequency control to the actual values, and establish the steady state of the large-scale grid cross-platform electromagnetic transient real-time simulation system.

[0120] In a preferred embodiment of a specific application, using the method proposed by the present invention, a full electromagnetic transient digital-analog hybrid simulation of the East China Grid and the Northwest Grid in 2021 was realized. The East China regional grid model covers the grid framework of the East China Grid at voltage levels of 220 kV and above, as well as 11 DC projects sending power to the East China region; the Northwest regional grid model covers the grid framework of the Northwest Grid at voltage levels of 110 kV and above, as well as 8 DC projects sent out from the Northwest region. Among them, 2 DC projects are the interconnected DC projects between the Northwest and the East China. All DC transmission system models are strictly modeled according to the actual project parameters and are connected with 16 sets of DC transmission control and protection devices consistent with the actual project. The Northwest and East China regional grids operate on 2 supercomputer platforms respectively, and use 2 interconnected DC transmission lines to realize joint simulation. This method realizes the full electromagnetic transient digital-analog hybrid real-time simulation of the largest-scale interconnected power grid currently, with the simulation scale ranking first in the world, and it is the only means at home and abroad that can conduct digital-analog hybrid real-time simulation research on a cross-regional power grid with tens of thousands of three-phase nodes. Based on the above simulation system, a stability characteristic test study on the Changji-Guquan DC external transmission system was carried out, providing technical support for the dispatching operation mode arrangement.

[0121] In the embodiment of the present invention, based on a super parallel computer, using the implementation method of cross-platform large-scale grid electromagnetic transient real-time simulation proposed by the present invention, a full electromagnetic transient real-time simulation model of two large regional grids and a cross-regional interconnected DC transmission project was established. The total simulation scale is 10,600 three-phase nodes, 880 generators, nearly 8,400 lines, nearly 4,400 transformers, and nearly 13,000 loads. The AC power grid covers various typical AC bus voltage levels such as 110 kV, 220 kV, 330 kV, 500 kV, 750 kV, and 1000 kV. In addition, a digital-analog hybrid model of multiple DC transmission projects is connected to the simulation model, and its controller uses a physical control and protection device consistent with the on-site control characteristics. The joint simulation of the cross-regional power grid was realized according to the steps proposed by the present invention. The system can quickly enter a stable state and has test conditions, and can further carry out simulation research on the AC-DC interaction between regional power grids.

[0122] Thus, the present invention is implemented based on the new generation digital-analog hybrid real-time simulation platform of the State Grid Simulation Center. The digital system of the new generation digital-analog hybrid real-time simulation platform is based on a super parallel computer platform, and has the largest full electromagnetic transient simulation scale in the world. It can highly restore the actual power grid and its characteristics, and has access to the actual control and protection devices of the in-service HVDC. Its simulation accuracy is high and it has become a calibration tool for other simulation systems. In addition, the method for realizing cross-platform large-scale power grid electromagnetic transient real-time simulation proposed by the present invention has verified the effectiveness of the realization method through transient and steady-state simulation tests. This realization method can multiply the full electromagnetic transient real-time simulation ability, and has a certain generality. It can be extended to different electromagnetic transient real-time simulation platforms for implementation, and can be further tried in the electromagnetic transient real-time simulation of multi-region power grids and even national interconnected power grids.

[0123] Exemplary system

[0124] Figure 3 FIG. is a schematic structural diagram of an implementation system for cross-platform AC-DC power grid electromagnetic transient real-time simulation provided by an exemplary embodiment of the present invention. As Figure 3 shown, the system 300 includes:

[0125] A configuration module 310, configured to configure a decoupling interface model for cross-platform simulation;

[0126] A networked HVDC transmission system model generation module 320, configured to generate a networked HVDC transmission system model for cross-region networked simulation based on the configured decoupling interface model;

[0127] A performance verification module 330, configured to verify whether the performance of the decoupling interface model meets the requirements by using the networked HVDC transmission system model

[0128] A regional power grid model generation module 340, configured to divide the rectifier side and the inverter side of the networked HVDC transmission system by using the decoupling interface model after the performance of the decoupling interface model meets the requirements, to obtain two regional power grid models for cross-region asynchronous networking;

[0129] A regional power grid model startup module 350, configured to start two regional power grid models for cross-region asynchronous networking according to a preset startup rule;

[0130] A steady-state establishment module 360, configured to establish the steady state of two regional power grid models for cross-region asynchronous networking according to a preset steady-state establishment rule.

[0131] Optionally, the configuration module 310 is specifically configured to:

[0132] Design interface circuit configuration parameters based on the line parameters of the networked HVDC project;

[0133] Set the minimum error of the fault simulation results at both ends of the steady-state and DC lines as the goal;

[0134] Optimize the position and length of the decoupling interface model embedded in the DC transmission line.

[0135] Optionally, the networked DC transmission system model generation module 320 is specifically used for:

[0136] Build a cross-regional networked DC transmission system according to the actual project to generate a DC line model;

[0137] Connect the actual control and protection devices to the DC line model;

[0138] Connect the decoupling interface model to a certain length in the middle position of the DC line model, and connect lines related to frequency to both ends of the remaining part of the DC line model, so as to generate a networked DC transmission system model for cross-regional networked simulation.

[0139] Optionally, the regional power grid model startup module 350 is specifically used for:

[0140] Run the two regional power grid models of cross-regional asynchronous networking on two supercomputer platforms respectively;

[0141] Design the communication channels of the interface measuring points and set the primary and secondary system levels;

[0142] First start the regional power grid model on the supercomputer platform of the primary system, and then start the regional power grid model on the supercomputer platform of the secondary system until the two regional power grid models of cross-regional asynchronous networking are successfully started.

[0143] Optionally, the regional power grid model startup module 350 is also specifically used for:

[0144] Conduct off-line power flow calculations on the two regional power grid models of cross-regional asynchronous networking respectively, and after verifying that the power flow calculation results are correct, use the generator steady-state calculation values as the startup initial values of the corresponding regional power grid models;

[0145] Map and allocate the CPU tasks of the two supercomputer platforms to make the CPU load of each supercomputer platform balanced.

[0146] Optionally, the regional power grid model startup module 350 is also specifically used for:

[0147] First start the regional power grid model on the supercomputer platform of the primary system, and check whether there is continuous timeout overflow. If there is overflow, continue to adjust until the real-time requirements are met;

[0148] When the regional power grid model started earlier meets the real-time requirements, start the regional power grid model of the supercomputer platform running in the auxiliary system later, and check for continuous timeout overflows. If there are overflows, continue to adjust until the real-time requirements are met;

[0149] When the regional power grid models started later all meet the real-time requirements, detect whether the waveform power flows of the two regional power grid models are correct;

[0150] When the waveform power flows of the two regional power grid models are both correct, determine that the start-up of the two regional power grid models for cross-regional asynchronous networking is successful.

[0151] Optionally, the steady-state establishment module 360 is specifically configured to:

[0152] Switch the generators of the two regional power grid models for cross-regional asynchronous networking to an external control system;

[0153] First, unlock the non-networked direct currents within the two regional power grid models respectively, and then unlock the direct current transmission systems used for networking within the two regional power grid models;

[0154] After the AC-DC systems within the two regional power grid models for cross-regional asynchronous networking operate stably, restore the limit values of the damping coefficient and the upper and lower limits of the frequency control of the generators to the actual values, thus completing the steady-state establishment of the two regional power grid models for cross-regional asynchronous networking.

[0155] The implementation system 300 for cross-platform AC-DC power grid electromagnetic transient real-time simulation in the embodiments of the present invention corresponds to the implementation method 100 for cross-platform AC-DC power grid electromagnetic transient real-time simulation in another embodiment of the present invention, and will not be elaborated here.

[0156] Exemplary electronic device

[0157] Figure 4 It is the structure of an electronic device provided by an exemplary embodiment of the present invention. The electronic device can be any one or both of the first device and the second device, or a stand-alone device independent of them. The stand-alone device can communicate with the first device and the second device to receive the input signals collected from them. Figure 4 The block diagram of the electronic device according to an embodiment of the present invention is illustrated. As Figure 4 shown, the electronic device 40 includes one or more processors 41 and a memory 42.

[0158] The processor 41 can be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and can control other components in the electronic device to perform desired functions.

[0159] The memory 42 may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage media, and the processor 41 may run the program instructions to implement the method of information mining on historical change records of the software programs of the various embodiments of the present invention described above and / or other desired functions. In one example, the electronic device may further include: an input system 43 and an output system 44, and these components are interconnected through a bus system and / or other forms of connection mechanisms (not shown).

[0160] In addition, the input system 43 may further include, for example, a keyboard, a mouse, and so on.

[0161] The output system 44 may output various information to the outside. The output device 44 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, and so on.

[0162] Of course, for simplicity, Figure 4 only some of the components related to the present invention in the electronic device are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, according to specific application scenarios, the electronic device may further include any other appropriate components.

[0163] Exemplary computer program product and computer-readable storage medium

[0164] In addition to the above methods and devices, embodiments of the present invention may also be computer program products, which include computer program instructions that, when run by a processor, cause the processor to execute the steps in the method of information mining on historical change records according to various embodiments of the present invention described in the above "Exemplary Method" section of this specification.

[0165] The computer program products may be written in any combination of one or more programming languages for programming code to perform the operations of the embodiments of the present invention. The programming languages include object-oriented programming languages, such as Java, C++, etc., and also include conventional procedural programming languages, such as the "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, executed as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0166] In addition, an embodiment of the present invention may also be a computer-readable storage medium storing computer program instructions, which, when run by a processor, cause the processor to execute the steps in the method of information mining on historical change records according to various embodiments of the present invention described in the above "Exemplary Method" section of this specification.

[0167] The computer-readable storage medium may adopt any combination of one or more readable media. The readable media may be a readable signal medium or a readable storage medium. The readable storage medium may, for example, include but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the readable storage medium include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0168] The basic principles of the present invention have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present invention. In addition, the above-disclosed specific details are only for the purpose of illustration and facilitating understanding, rather than limitations. The above details do not limit the present invention to necessarily adopt the above specific details for implementation.

[0169] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference may be made to each other. For system embodiments, since they basically correspond to method embodiments, they are described relatively simply, and reference may be made to the partial description of the method embodiments for relevant parts.

[0170] The block diagrams of the devices, systems, apparatuses, and systems involved in the present invention are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, apparatuses, and systems can be connected, arranged, and configured in any way. Words such as "including", "comprising", "having", etc. are open-ended terms, meaning "including but not limited to", and can be used interchangeably with each other. The words "or" and "and" used herein refer to the word "and / or" and can be used interchangeably with each other, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to" and can be used interchangeably with each other.

[0171] The methods and systems of the present invention can be implemented in many ways. For example, the methods and systems of the present invention can be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the methods is for illustrative purposes only, and the steps of the methods of the present invention are not limited to the specific order described above, unless otherwise specifically stated. In addition, in some embodiments, the present invention can also be implemented as a program recorded in a recording medium, and these programs include machine-readable instructions for implementing the methods according to the present invention. Therefore, the present invention also covers a recording medium storing a program for executing the methods according to the present invention.

[0172] It should also be noted that in the systems, devices, and methods of the present invention, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0173] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions, and sub-combinations thereof.

Claims

1. A method for implementing real-time electromagnetic transient simulation of AC-DC power grids across platforms, characterized in that, Including: Configure the decoupled interface model for cross-platform simulation; Based on the configured decoupled interface model, generate a networked HVDC transmission system model for cross-region networking simulation; Use the networked HVDC transmission system model to verify whether the performance of the decoupled interface model meets the requirements; After the performance of the decoupled interface model meets the requirements, use the decoupled interface model to divide the rectifier side and the inverter side of the networked HVDC transmission system to obtain two regional power grid models for cross-region asynchronous networking; According to the pre-set startup rules, start the two regional power grid models for cross-region asynchronous networking; According to the pre-set steady-state establishment rules, establish the steady state of the two regional power grid models for cross-region asynchronous networking; Configure the decoupled interface model for cross-platform simulation, including: Based on the line parameters of the networked HVDC project, design the interface circuit configuration parameters; Set the minimum error of the steady-state and fault simulation results at both ends of the DC line as the goal; Optimize the position and length of the decoupled interface model embedded in the HVDC transmission line; Based on the configured decoupled interface model, generate a networked HVDC transmission system model for cross-region networking simulation, including: Build a cross-region networked HVDC transmission system according to the actual project to generate a DC line model; Connect the actual control and protection devices to the DC line model; Connect the decoupled interface model to a certain length in the middle position of the DC line model, and connect lines related to frequency to both ends of the DC line model, so as to generate a networked HVDC transmission system model for cross-region networking simulation.

2. The method according to claim 1, wherein According to the pre-set startup rules, start the two regional power grid models for cross-region asynchronous networking, including: Run the two regional power grid models for cross-region asynchronous networking on two supercomputer platforms respectively; Design the communication channels of the interface measurement points and set the main and auxiliary system levels; First start the regional power grid model on the supercomputer platform of the main system, and then start the regional power grid model on the supercomputer platform of the auxiliary system until the two regional power grid models for cross-region asynchronous networking are successfully started.

3. The method according to claim 2, characterized in that, Before first starting the regional power grid model on the supercomputer platform of the main system and then starting the regional power grid model on the supercomputer platform of the auxiliary system, including: Conduct off-line power flow calculations on the two regional power grid models for cross-region asynchronous networking respectively, and after verifying that the power flow calculation results are correct, use the generator steady-state calculation values as the startup initial values of the corresponding regional power grid models; Map and allocate the CPU tasks of the two supercomputer platforms to make the CPU load of each supercomputer platform balanced.

4. The method according to claim 2, wherein First start the regional power grid model on the supercomputer platform of the main system, and then start the regional power grid model on the supercomputer platform of the auxiliary system until the two regional power grid models for cross-region asynchronous networking are successfully started, including: First start the regional power grid model on the supercomputer platform of the main system and check whether there is continuous timeout overflow. If there is overflow, continue to adjust until the real-time requirements are met; When the first-started regional power grid model meets the real-time requirements, then start the regional power grid model on the supercomputer platform of the auxiliary system and check whether there is continuous timeout overflow. If there is overflow, continue to adjust until the real-time requirements are met; When the region grid models started later all meet the real-time requirements, detect whether the waveform power flows of the two region grid models are correct; When the waveform power flows of the two region grid models are both correct, determine that the start-up of the two region grid models for cross-region asynchronous networking is successful.

5. The method according to claim 1, wherein According to the pre-set steady-state establishment rules, establish the steady state of the two region grid models for cross-region asynchronous networking, including: Switch the generators of the two region grid models for cross-region asynchronous networking to an external control system; First, unlock the non-networked direct currents within the two region grid models respectively, and then unlock the DC transmission systems for networking within the two region grid models; After the AC-DC systems within the two region grid models for cross-region asynchronous networking operate stably, restore the limit values of the damping coefficient and the upper and lower limits of the frequency control of the generators to actual values, thus completing the steady-state establishment of the two region grid models for cross-region asynchronous networking.

6. An implementation system for real-time electromagnetic transient simulation of AC-DC power grids across platforms, characterized in that, Including: A configuration module, used to configure the decoupling interface model for cross-platform simulation; A networked DC transmission system model generation module, used to generate a networked DC transmission system model for cross-region networking simulation based on the configured decoupling interface model; A performance verification module, used to verify whether the performance of the decoupling interface model meets the requirements by using the networked DC transmission system model; A region grid model generation module, used to split the rectifier side and the inverter side of the networked DC transmission system by using the decoupling interface model after the performance of the decoupling interface model meets the requirements, to obtain the two region grid models for cross-region asynchronous networking; A region grid model start-up module, used to start the two region grid models for cross-region asynchronous networking according to the pre-set start-up rules; A steady-state establishment module, used to establish the steady state of the two region grid models for cross-region asynchronous networking according to the pre-set steady-state establishment rules; The configuration module is specifically used for: Design the interface circuit configuration parameters based on the line parameters of the networked DC project; Set the minimum error of the steady-state and the fault simulation results at both ends of the DC line as the target; Optimize the position and length of the decoupling interface model embedded in the DC transmission line; The networked DC transmission system model generation module is specifically used for: Build a DC transmission system for cross-region networking according to the actual project to generate a DC line model; Connect the actual control and protection devices to the DC line model; Connect the decoupling interface model to a certain length in the middle position of the DC line model, and connect lines related to frequency to both ends of the DC line model, thus generating a networked DC transmission system model for cross-region networking simulation.

7. The system according to claim 6, characterized in that, The region grid model start-up module is specifically used for: Run the two region grid models for cross-region asynchronous networking on two supercomputer platforms respectively; Design the communication channels of the interface measuring points and set the main and auxiliary system levels; First start the region grid model running on the supercomputer platform of the main system, and then start the region grid model running on the supercomputer platform of the auxiliary system until the two region grid models for cross-region asynchronous networking are successfully started.

8. The system according to claim 7, wherein The region grid model start-up module is also specifically used for: Perform off-line power flow calculations on the two regional power grid models for cross-regional asynchronous networking respectively. After verifying that the power flow calculation results are correct, use the steady-state calculation values of the generators as the starting initial values for the corresponding regional power grid models. Map and allocate the CPU tasks of the two supercomputer platforms to balance the CPU loads of each supercomputer platform.

9. The system according to claim 7, wherein The regional power grid model startup module is also specifically used for: First, start the regional power grid model of the supercomputer platform running on the main system and check for persistent timeout overflows. If there are overflows, continue to adjust until the real-time requirements are met. When the first-started regional power grid model meets the real-time requirements, start the regional power grid model of the supercomputer platform running on the auxiliary system and check for persistent timeout overflows. If there are overflows, continue to adjust until the real-time requirements are met. When the later-started regional power grid models all meet the real-time requirements, detect whether the waveform power flows of the two regional power grid models are correct. When the waveform power flows of the two regional power grid models are both correct, determine that the startup of the two regional power grid models for cross-regional asynchronous networking is successful.

10. The system according to claim 6, characterized in that, The steady-state establishment module is specifically used for: Switch the generators of the two regional power grid models for cross-regional asynchronous networking to an external control system. First, unlock the non-networked direct currents within the two regional power grid models respectively, and then unlock the direct current transmission systems used for networking within the two regional power grid models. After the AC-DC systems within the two regional power grid models for cross-regional asynchronous networking operate stably, restore the limit values of the damping coefficients and frequency control upper and lower limits of the generators to actual values, thus completing the steady-state establishment of the two regional power grid models for cross-regional asynchronous networking.

11. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1-5 above.

12. An electronic device, characterized in that, The electronic device includes: A processor; A memory for storing executable instructions that can be executed by the processor; The processor is used to read the executable instructions from the memory and execute the instructions to implement the method according to any one of claims 1-5 above.

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