An implementation method, system and storage medium for electromagnetic and electromechanical transient hybrid simulation

Abstract

The present invention discloses a method, system and storage medium for realizing electromagnetic-mechanical transient hybrid simulation. In the method, according to the power grid security and stability problems, power grid operation states and disturbance forms concerned by the analysis and calculation scenarios, characteristic quantities of the analysis and calculation scenarios are extracted, the difference states of the simulation results in the cases where the simulation objects adopt electromagnetic transient models and electromechanical transient models are analyzed, a simulation object model classifier is generated based on offline training, a non-linear mapping relationship is established between the power grid and the characteristic quantities of the disturbance scenarios and the difference states of the simulation results under the two types of models, the simulation objects that should adopt electromagnetic transient models and the simulation objects that can adopt electromechanical transient models in the hybrid simulation are judged, and the electromagnetic-mechanical transient hybrid simulation of the adaptive analysis and calculation scenarios is realized, which is beneficial to giving full play to the respective advantages of electromagnetic transient simulation and electromechanical transient simulation and effectively coordinating and resolving the conflict between the simulation accuracy and efficiency of the power grid system level.

Description

Technical Field

[0001] The present invention relates to a method and system for realizing electromagnetic-mechanical transient hybrid simulation in an adaptive power grid security and stability analysis and calculation scenario, and belongs to the technical field of power systems. Background Art

[0002] Simulation is an important technical means for analyzing the dynamic characteristics of a power system under disturbances and is widely used in theoretical research and engineering practice. There are three types of power grid system-level simulations: electromagnetic transient simulation, electromechanical transient simulation, and electromagnetic-mechanical transient hybrid simulation. The key difference is the transient models used for the simulation objects. In electromagnetic transient simulation, the electromagnetic transient model is used for the simulation objects; in electromechanical transient simulation, the electromagnetic transient model is used for the simulation objects; and in electromagnetic-mechanical transient hybrid simulation, a small number of simulation objects use the electromagnetic transient model, and other large-scale simulations use the electromechanical transient model. Comparing electromagnetic transient simulation with electromechanical transient simulation, electromagnetic transient simulation can accurately obtain the dynamic characteristics of various components with high simulation accuracy, but it consumes more simulation resources and time. Electromechanical transient simulation is efficient but difficult to account for the rapidly changing electromagnetic transient process. The electromagnetic-mechanical transient hybrid simulation technology provides a good opportunity to coordinate the simulation accuracy and efficiency of the power grid system-level simulation, hoping to integrate the advantages of electromagnetic transient simulation and electromechanical transient simulation while discarding their disadvantages.

[0003] An important problem faced in the application of electromagnetic-mechanical transient hybrid simulation is to properly determine which simulation objects should use the electromagnetic model and which simulation objects can use the electromechanical transient model, which can not only meet the simulation accuracy required by the analysis and calculation purpose, but also efficiently utilize simulation resources and ensure timeliness. So far, it usually relies on the experience of power grid analysis engineers to manually determine the simulation objects using the electromagnetic transient model, which is relatively fixed and lacks strict theoretical and practical basis. There is a hidden danger that the accuracy of the simulation results may be impaired due to the lack of electromagnetic transient simulation objects, and it is also difficult to avoid application difficulties due to too many electromagnetic transient simulation objects.

[0004] With the large-scale grid connection of new energy and the progress of power grid transmission and transformation technologies, on the one hand, the scale of the power system is getting larger and larger, and on the other hand, the number of power electronic devices with significant electromagnetic characteristics in the system has increased significantly. Therefore, the scenario of applying electromagnetic-mechanical transient hybrid simulation in modern power system analysis is more common. Combining the analysis and calculation purpose, it is of increasing importance and urgency to reasonably determine the simulation objects using the electromagnetic transient model in the hybrid simulation based on the power grid operation state and disturbance form. It can be seen that automatically coordinating the analysis and calculation purpose, power grid operation state, and disturbance form to realize an adaptive electromagnetic-mechanical transient hybrid simulation method is of great significance. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in the problem of properly selecting electromagnetic transient simulation objects and electromechanical transient simulation objects according to the security and stability problems, grid operation states, and disturbance forms concerned in the analysis and calculation scenarios in hybrid simulation, how to give full play to the respective advantages of electromagnetic transient simulation and electromechanical transient simulation, and effectively coordinate and resolve the conflict between the simulation accuracy and efficiency of the power grid system level.

[0006] To solve the above technical problem, the technical solution adopted by the present invention is:

[0007] A method for realizing electromagnetic and electromechanical transient hybrid simulation, comprising the following steps:

[0008] Based on the grid operation state and disturbance form, extract the characteristic quantities of the grid operation state and the characteristic quantities of the disturbance scenario;

[0009] Input the grid security and stability problems, the characteristic quantities of the grid operation state, and the characteristic quantities of the disturbance scenario concerned in the analysis and calculation scenario into a pre-generated simulation object model classifier to determine the simulation objects in the hybrid simulation, where the simulation objects include the simulation objects that should adopt the electromagnetic transient model or the simulation objects that adopt the electromechanical transient model;

[0010] According to the output result of the simulation object model classifier, the simulation objects in the hybrid simulation adopt the corresponding electromagnetic transient model or electromechanical transient model to perform transient time-domain simulation.

[0011] The input of the simulation object model classifier is the grid security and stability problems, the grid and disturbance scenario characteristic quantities concerned in the analysis and calculation scenario, and the output of the classifier is that the simulation objects in the hybrid simulation should adopt the electromagnetic transient model or the electromechanical transient model.

[0012] Grid security and stability problems n concerned in the analysis and calculation scenario TGl Include the following types:

[0013] Power angle stability problem and power oscillation problem n TGl = 1;

[0014] Frequency security and stability problem n TGl = 2;

[0015] Voltage security and stability problem n TGl = 3;

[0016] Multiple types of security and stability problems n TGl = 4.

[0017] The grid and disturbance scenario characteristic quantities include two parts, the characteristic quantity GS representing the grid operation state and the characteristic quantity DS representing the disturbance form.

[0018] The extraction method of the grid operation state characteristic quantity GS is:

[0019] For the simulation object i, the grid-connected bus is j. Based on the power flow calculation results under the pre-disturbance condition, calculate the power supply voltage of the single-port Thevenin equivalent circuit of bus j facing the power grid and impedance Z ij0 , and obtain the grid operation state characteristic quantities of the simulation object i as and impedance Z ij0 .

[0020] The extraction method of the disturbance form characteristic quantity DS is as follows:

[0021] Disturb the simulation object i by k. Considering the influence of the disturbance, calculate the power supply voltage of the single-port Thevenin equivalent circuit of bus j facing the power grid and impedance Z ijk , and obtain the disturbance form characteristic quantity as: and ΔZ ik =Z ijk -Z ij0 , is the change in the power supply voltage of the single-port Thevenin equivalent circuit parameters of bus j facing the power grid caused by the disturbance k, and ΔZ ik is the change in the power supply impedance of the single-port Thevenin equivalent circuit parameters of bus j facing the power grid caused by the disturbance k.

[0022] Based on machine learning, through offline training, the goal of generating the simulation object model classifier is to establish a non-linear mapping relationship between the analysis and calculation scenario characteristic quantities and the difference states of the simulation results under two types of models, namely the electromagnetic transient model and the electromechanical transient model, of the simulation object.

[0023] The difference states of the simulation results are divided into two categories: significant difference in simulation results and small difference in simulation results. When the simulation object model classifier determines that the difference in simulation results is significant, the output information is: the electromagnetic transient model should be used for the simulation object. When the classifier determines that the difference in simulation results is small, the output information is: the electromechanical transient model is used for the simulation object.

[0024] The specific method for evaluating and distinguishing the difference states of the simulation results under the two types of models is as follows:

[0025] (1) The simulation object i uses the electromagnetic transient model. Considering the influence of the disturbance k, perform transient time-domain simulation to obtain the key physical quantity trajectory EMTU ik (l) output by the simulation object i to the power grid through the grid-connected port, where l corresponds to the output count of the electromechanical transient simulation;

[0026] (2) The simulation object i uses the electromechanical transient model. Considering the influence of the disturbance k and keeping other simulation conditions unchanged, perform transient time-domain simulation to obtain the physical quantity trajectory RMSU ik (l) output by the simulation object i to the power grid through the grid-connected port;

[0027] (3) Calculate the simulation difference index between the electromagnetic transient model and the electromechanical transient model, ΔUmax ik = max 1≤l≤lm |EMTU ik (l) - RMSU ik (l)|, ΔUmax ik is the maximum difference in the trajectories of the key physical quantities output from the grid connection port to the power grid under two cases of the electromagnetic transient model and the electromechanical transient model for the simulation object i considering the influence of disturbance k. lm is the maximum number of outputs of the electromechanical transient simulation;

[0028] (4) Classification criterion. If ΔUmax ik > ΔUth, the simulation results have significant differences, and the electromagnetic transient model should be used for the simulation object i; otherwise, if ΔUmax ik ≤ ΔUth, the simulation results have small differences, and the electromechanical transient model can be used for the simulation object i. ΔUth is the difference threshold value.

[0029] Based on the type n of the security and stability problems concerned in the simulation analysis calculation scenario TGl , generate the corresponding type of classifier n through offline training TCl , and the corresponding relationship is as follows:

[0030] For the power angle stability problem and the power oscillation problem n TGl = 1, then the power type classifier n TCl = 1;

[0031] For the frequency security and stability problem n TGl = 2, then the frequency type classifier n TCl = 2;

[0032] For the voltage security and stability problem n TGl = 3, then the voltage type classifier n TCl = 3;

[0033] For the multi-class security and stability problem n TGl = 4, then the comprehensive type classifier n TCl = 4.

[0034] Extract the specific situation of the key physical quantity trajectory - EMTU ik (l) and the key physical quantity trajectory - RMSU ik (l) is determined by the type of classifier n TCl , specifically:

[0035] When the power type classifier n TCl = 1, the active power P ik (l) output from the simulation object to the power grid can be selected, and the electromagnetic transient model simulation is marked as EMTP ik(l), corresponding to the electromechanical transient model simulation marked as RMSP ik (l);

[0036] Frequency classifier n TCl When = 2, the active power P output by the simulation object to the power grid can be selected ik (l), corresponding to the electromagnetic transient model simulation marked as EMTP ik (l), corresponding to the electromechanical transient model simulation marked as RMSP ik (l);

[0037] Voltage classifier n TCl When = 3, the reactive power Q output by the simulation object to the power grid can be selected ik (l), corresponding to the electromagnetic transient model simulation marked as EMTQ ik (l), corresponding to the electromechanical transient model simulation marked as RMSQ ik (l);

[0038] Comprehensive classifier n TCl When = 4, the active power P and reactive power Q output by the simulation object to the power grid can be selected ik (l) and reactive power Q ik (l), corresponding to the active power EMTP of the electromagnetic model in the electromagnetic transient model simulation ik (l) and the reactive power EMTQ of the electromagnetic model ik (l), corresponding to the active power RMSP of the electromechanical transient model in the electromechanical transient model simulation ik (l) and the reactive power RMSQ of the electromechanical transient model ik (l).

[0039] Based on the input of the same power grid and disturbance scenario sample set, through offline training, multiple types of classifiers n are generated TCl , and the implementation process is as shown in the attached instructions Figure 2 as follows:

[0040] Input the power grid operation state and disturbance form samples;

[0041] Extract the power grid operation state characteristic quantities and disturbance scenario characteristic quantities;

[0042] Taking into account the influence of disturbance k, the simulation object i uses the electromagnetic transient model for transient time-domain simulation;

[0043] Taking into account the influence of disturbance k, the simulation object i uses the electromechanical transient model for transient time-domain simulation;

[0044] According to the security and stability issues n concerned by the simulation analysis calculation scenario TGl , respectively extract the corresponding key physical quantity trajectories;

[0045] Evaluate the security and stability issues n separately TGl Corresponding simulation result difference status, and determine the model type adopted by the simulation object.

[0046] For a specific simulation analysis task, the method for determining whether the simulation object i in the hybrid simulation should adopt the electromagnetic transient model or the electromechanical transient model is as follows:

[0047] Input the power grid operation status information and disturbance scenario information corresponding to the simulation task, and analyze the type of power grid security and stability issues concerned in the calculation scenario n TGl and the simulation object i;

[0048] For the simulation object i, extract the characteristic quantity information GS of the power grid operation status i and the disturbance scenario characteristic quantity information DS ik ;

[0049] According to the type of security and stability issues concerned in the simulation analysis calculation scenario n TGl , determine the type of classifier n TCl ;

[0050] The characteristic quantity information GS of the power grid operation status i and the disturbance scenario characteristic quantity information DS ik Input into the classifier TCl ;

[0051] The classifier TCl Output the judgment information on whether the simulation object i in the hybrid simulation should adopt the electromagnetic transient model or the electromechanical transient model.

[0052] Implement two stages of the electromagnetic and electromechanical transient hybrid simulation for the adaptive power grid security and stability analysis calculation scenario:

[0053] Construct a simulation object model classifier: Based on machine learning, generate a sample set of power grid operation status and disturbance scenarios, and generate a classifier through offline training;

[0054] Apply the simulation object model classifier: For a specific simulation analysis task, input the characteristic quantities of its power grid security and stability analysis calculation scenario into the simulation object model classifier, and combine the information on the model type adopted by the simulation object automatically judged and output by the simulation object model classifier to perform transient time-domain simulation.

[0055] An electromagnetic and electromechanical transient hybrid simulation system, including:

[0056] Characteristic quantity information extraction module: Based on the power grid operation status and disturbance pattern, extract the characteristic quantities of the power grid operation status and the disturbance scenario characteristic quantities;

[0057] Simulation object determination module: Input the power grid security and stability issues, characteristic quantities of the power grid operation state, and disturbance scenario characteristic quantities concerned in the analysis and calculation scenario into the pre-generated simulation object model classifier to determine the simulation objects in the hybrid simulation, where the simulation objects include those that should adopt the electromagnetic transient model or the electromechanical transient model;

[0058] Time-domain simulation module: According to the output result of the simulation object model classifier, the simulation objects in the hybrid simulation adopt the corresponding electromagnetic transient model or electromechanical transient model to perform transient time-domain simulation.

[0059] A computer-readable storage medium storing one or more programs, where the one or more programs include instructions that, when executed by a computing device, cause the computing device to execute the electromagnetic and electromechanical transient hybrid simulation method.

[0060] A computing device includes one or more processors, one or more memories, and one or more programs, where the one or more programs are stored in the one or more memories and are configured to be executed by the one or more processors, and the one or more programs include instructions for executing the electromagnetic and electromechanical transient hybrid simulation method.

[0061] The beneficial effects achieved by the present invention: According to the security and stability issues, power grid operation state, and disturbance patterns concerned in the analysis and calculation scenario, the present invention automatically analyzes the difference state of the simulation results in two cases where the simulation objects adopt the electromagnetic transient model and the electromechanical transient model, determines the simulation objects that should adopt the electromagnetic transient model and the simulation objects that can adopt the electromechanical transient model in the hybrid simulation, and realizes the electromagnetic and electromechanical transient hybrid simulation method that adapts to the analysis and calculation scenario, which is beneficial to giving full play to the respective advantages of the electromagnetic transient simulation and the electromechanical transient simulation, effectively coordinating and resolving the conflict between the simulation accuracy and efficiency of the power grid system level, and providing a technical basis for further improving the ability to control the high-quality and efficient operation of the modern power system by applying simulation technology. Description of the Drawings

[0062] Figure 1 is the flowchart of the method of the present invention;

[0063] Figure 2 is the flowchart for generating the multi-type classifier. Detailed Embodiments

[0064] The present invention will be further described below with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly and cannot be used to limit the protection scope of the present invention.

[0065] Embodiment 1

[0066] As Figure 1As shown in the figure, the electromagnetic and electromechanical transient hybrid simulation method of the present invention includes the following steps:

[0067] Step 1: Based on the grid operation state and disturbance pattern, extract the characteristic quantities of the grid operation state and the characteristic quantities of the disturbance scenario.

[0068] Step 2: Input the grid security and stability issues concerned in the analysis and calculation scenario, the characteristic quantities of the grid operation state, and the characteristic quantities of the disturbance scenario into the pre-generated simulation object model classifier to determine the simulation objects in the hybrid simulation, where the simulation objects include the simulation objects that should adopt the electromagnetic transient model or the simulation objects that adopt the electromechanical transient model.

[0069] Step 3: According to the output result of the simulation object model classifier, the simulation objects in the hybrid simulation adopt the corresponding electromagnetic transient model or electromechanical transient model to perform transient time-domain simulation. The simulation object refers to the power electronic system / equipment with significant electromagnetic characteristics included in the transient time-domain simulation.

[0070] In Step 1, to construct the simulation object model classifier, basic information needs to be obtained first. The basic information includes power system parameters and models, grid operation information and disturbance pattern information, and the grid security and stability issues concerned in the analysis and calculation scenario.

[0071] Among them, the power system parameters and models include the parameters and models for power system power flow calculation and transient time-domain simulation calculation. For power electronic equipment / systems with significant electromagnetic characteristics, they include electromagnetic transient models and parameters and electromechanical transient models and parameters.

[0072] The grid operation information includes network topology, generator startup and output, and load conditions, as well as the operation status of the source-network-load-storage related control systems.

[0073] The disturbance pattern information includes disturbance type, disturbance location, and time sequence.

[0074] The grid and disturbance scenario characteristic quantities include two parts, the characteristic quantity GS representing the grid operation state and the characteristic quantity DS representing the disturbance pattern.

[0075] The extraction method of the grid operation state characteristic quantity GS is as follows:

[0076] For the grid-connected bus of simulation object i being j, based on the power flow calculation result under the pre-disturbance condition, calculate the power supply voltage and impedance Z ij0 , and obtain the grid operation state characteristic quantity of simulation object i as and impedance Z ij0 .

[0077] The extraction method of the disturbance morphological feature quantity DS is as follows:

[0078] For the disturbance k of the simulation object i, considering the disturbance influence, calculate the power supply voltage of the single-port Thevenin equivalent circuit parameters of the busbar j facing the power grid and the impedance Z ijk , and the obtained disturbance morphological feature quantity is: and ΔZ ik = Z ijk - Z ij0 , is the change in the power supply voltage of the single-port Thevenin equivalent circuit parameters of the busbar j facing the power grid caused by the disturbance k, and ΔZ ik is the change in the power supply impedance of the single-port Thevenin equivalent circuit parameters of the busbar j facing the power grid caused by the disturbance k.

[0079] Embodiment 2

[0080] An electromagnetic and electromechanical transient hybrid simulation method includes the following steps:

[0081] Step 1: Based on the power grid operation state and disturbance morphology, extract the feature quantity of the power grid operation state and the disturbance scenario feature quantity;

[0082] Step 2: Input the power grid security and stability issues, the feature quantity of the power grid operation state, and the disturbance scenario feature quantity concerned by the analysis and calculation scenario into the pre-generated simulation object model classifier to determine the simulation objects in the hybrid simulation, where the simulation objects include the simulation objects that should adopt the electromagnetic transient model or the simulation objects that adopt the electromechanical transient model;

[0083] Step 3: According to the output result of the simulation object model classifier, the simulation objects in the hybrid simulation adopt the corresponding electromagnetic transient model or electromechanical transient model to perform transient time-domain simulation.

[0084] In step 2,

[0085] Based on machine learning, through offline training, the goal of generating the simulation object model classifier is to establish a non-linear mapping relationship between the feature quantity of the analysis and calculation scenario and the difference state of the simulation results under the two types of models of the simulation object adopting the electromagnetic model or the electromechanical transient model.

[0086] The difference state of the simulation results is divided into two categories: significant difference in simulation results and small difference in simulation results. When the simulation object model classifier determines that the difference in simulation results is significant, the output information is: the simulation object should adopt the electromagnetic transient model, and when the classifier determines that the difference in simulation results is small, the output information is: the simulation object adopts the electromechanical transient model.

[0087] The specific method for evaluating and distinguishing the difference state of the simulation results under the two types of models is as follows:

[0088] (1) The simulation object i uses an electromagnetic transient model, taking into account the influence of disturbance k, and conducts transient time-domain simulation to obtain the trajectory of the key physical quantities output by the simulation object i to the power grid through the grid connection port - EMTU ik (l), where l corresponds to the output count of the electromechanical transient simulation;

[0089] (2) The simulation object i uses an electromechanical transient model, taking into account the influence of disturbance k, with other simulation conditions unchanged, and conducts transient time-domain simulation to obtain the trajectory of the physical quantities output by the simulation object i to the power grid through the grid connection port - RMSU ik (l);

[0090] (3) Calculate the simulation difference index between the electromagnetic transient model and the electromechanical transient model, ΔUmax ik = max 1≤l≤lm |EMTU ik (l) - RMSU ik (l)|, where ΔUmax ik is the maximum difference in the trajectory of the key physical quantities output from the grid connection port to the power grid under two cases where the simulation object i uses the electromagnetic transient model and the electromechanical transient model, taking into account the influence of disturbance k, and lm is the maximum number of electromechanical transient simulation outputs;

[0091] (4) Classification criterion: If ΔUmax ik > ΔUth, the simulation results have a significant difference, and the simulation object i should use the electromagnetic transient model; otherwise, if ΔUmax ik ≤ ΔUth, the simulation results have a small difference, and the simulation object i can use the electromechanical transient model, where ΔUth is the difference threshold value.

[0092] According to the category n of the security and stability issues concerned in the simulation analysis calculation scenario TGl , based on offline training, generate the corresponding type of classifier n TCl , and the corresponding relationship is as follows:

[0093] For the power angle stability problem and the power oscillation problem n TGl = 1, then the power type classifier n TCl = 1;

[0094] For the frequency security and stability problem n TGl = 2, then the frequency type classifier n TCl = 2;

[0095] For the voltage security and stability problem n TGl = 3, then the voltage type classifier n TCl = 3;

[0096] For the multi-category security and stability problem n TGl = 4, then the comprehensive type classifier n TCl = 4.

[0097] Extract the trajectory of key physical quantities - EMTU ik (l) and the trajectory of key physical quantities - RMSU ik (l) The specific situation is determined by classifier n TCl The type is as follows:

[0098] Power type classifier n TCl When = 1, the active power P output by the simulation object to the power grid can be selected ik (l), corresponding to the electromagnetic transient model simulation marked as EMTP ik (l), corresponding to the electromechanical transient model simulation marked as RMSP ik (l);

[0099] Frequency type classifier n TCl When = 2, the active power P output by the simulation object to the power grid can be selected ik (l), corresponding to the electromagnetic transient model simulation marked as EMTP ik (l), corresponding to the electromechanical transient model simulation marked as RMSP ik (l);

[0100] Voltage type classifier n TCl When = 3, the reactive power Q output by the simulation object to the power grid can be selected ik (l), corresponding to the electromagnetic transient model simulation marked as EMTQ ik (l), corresponding to the electromechanical transient model simulation marked as RMSQ ik (l);

[0101] Comprehensive type classifier n TCl When = 4, the active power P output by the simulation object to the power grid can be selected ik (l) and the reactive power Q ik (l), corresponding to the active power EMTP of the electromagnetic model in the electromagnetic transient model simulation ik (l) and the reactive power EMTQ of the electromagnetic model ik (l), corresponding to the active power RMSP of the electromechanical transient model in the electromechanical transient model simulation ik (l) and the reactive power RMSQ of the electromechanical transient model ik (l).

[0102] Based on the input of the same power grid and disturbance scenario sample set, through offline training, multiple types of classifiers n are generated TCl , and the implementation process is as shown in the attached instructions Figure 2 as follows:

[0103] Input the power grid operation state and disturbance form samples;

[0104] Extract the characteristic quantities of the power grid operation state and the disturbance scenario characteristic quantities;

[0105] Considering the influence of disturbance k, the transient time-domain simulation of simulation object i is carried out using the electromagnetic transient model;

[0106] Considering the influence of disturbance k, the transient time-domain simulation of simulation object i is carried out using the electromechanical transient model;

[0107] According to the security and stability issues n concerned in the simulation analysis calculation scenario TGl , extract the corresponding key physical quantity trajectories respectively;

[0108] Evaluate the difference states of the simulation results corresponding to the security and stability issues n TGl respectively, and determine the model type adopted by the simulation object.

[0109] Embodiment 3

[0110] An electromagnetic and electromechanical transient hybrid simulation method includes the following steps:

[0111] Step 1: Based on the power grid operation state and disturbance form, extract the characteristic quantities of the power grid operation state and the disturbance scenario characteristic quantities;

[0112] Step 2: Input the power grid security and stability issues, the characteristic quantities of the power grid operation state, and the disturbance scenario characteristic quantities concerned in the analysis and calculation scenario into the pre-generated simulation object model classifier to determine the simulation objects in the hybrid simulation, where the simulation objects include the simulation objects that should adopt the electromagnetic transient model or the simulation objects that adopt the electromechanical transient model;

[0113] Step 3: According to the output result of the simulation object model classifier, the simulation objects in the hybrid simulation adopt the corresponding electromagnetic transient model or electromechanical transient model to carry out the transient time-domain simulation.

[0114] In step 2,

[0115] The power grid security and stability issues concerned in the analysis and calculation scenario usually include:

[0116] Power angle stability problem and power oscillation problem n TGl = 1;

[0117] Frequency security and stability problem n TGl = 2;

[0118] Voltage security and stability problem n TGl = 3;

[0119] Multiple types of security and stability problems n TGl = 4.

[0120] For a specific simulation analysis task, the method for determining whether the simulation object i in the hybrid simulation should adopt the electromagnetic transient model or the electromechanical transient model is as follows:

[0121] Input the grid operation status information and disturbance scenario information corresponding to the simulation task, and analyze and calculate the type n of grid security and stability problems concerned in the scenario TGl and the simulation object i;

[0122] For the simulation object i, extract the characteristic quantity information GS of the grid operation status i and the characteristic quantity information DS of the disturbance scenario ik ;

[0123] According to the type n of security and stability problems concerned in the simulation analysis and calculation scenario TGl , determine the type n of the classifier TCl ;

[0124] The characteristic quantity information GS of the grid operation status i and the characteristic quantity information DS of the disturbance scenario ik are input into the classifier n TCl ;

[0125] The classifier n TCl outputs the judgment information on whether the simulation object i in the hybrid simulation should adopt the electromagnetic transient model or the electromechanical transient model.

[0126] An electromagnetic and electromechanical transient hybrid simulation system includes:

[0127] Characteristic quantity information extraction module: Based on the grid operation status and disturbance pattern, extract the characteristic quantities of the grid operation status and the characteristic quantities of the disturbance scenario;

[0128] Simulation object determination module: Input the grid security and stability problems concerned in the analysis and calculation scenario, the characteristic quantities of the grid operation status, and the characteristic quantities of the disturbance scenario into the pre-generated simulation object model classifier to determine the simulation objects in the hybrid simulation, where the simulation objects include the simulation objects that should adopt the electromagnetic transient model or the electromechanical transient model;

[0129] Time-domain simulation module: According to the output result of the simulation object model classifier, the simulation objects in the hybrid simulation adopt the corresponding electromagnetic transient model or electromechanical transient model for transient time-domain simulation.

[0130] In the electromagnetic and electromechanical transient hybrid simulation system, the specific technical solutions and working steps are the same as those in the electromagnetic and electromechanical transient hybrid simulation method.

[0131] A computer-readable storage medium storing one or more programs, the one or more programs including instructions that, when executed by a computing device, cause the computing device to perform an electromagnetic-mechanical transient hybrid simulation method.

[0132] A computing device includes one or more processors, one or more memories, and one or more programs, where the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include instructions for performing an electromagnetic-mechanical transient hybrid simulation method.

[0133] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0134] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processors of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processors of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one or more flows and / or Figure 1 blocks or multiple blocks.

[0135] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one or more flows and / or Figure 1 blocks or multiple blocks.

[0136] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are performed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide means for implementing the functions specified in Figure 1 one or more flows and / orFigure 1 Steps of functions specified in one or more boxes.

[0137] The above are only embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval of the application.

Claims

1. An electromagnetic and electromechanical transient hybrid simulation method, characterized in that It includes the following steps: Based on the grid operation state and disturbance pattern, extract the characteristic quantities of the grid operation state and the characteristic quantities of the disturbance scenario; Input the power grid security and stability issues, the characteristic quantities of the grid operation state, and the characteristic quantities of the disturbance scenario concerned in the analysis and calculation scenario into the pre-generated simulation object model classifier to determine the simulation objects in the hybrid simulation, where the simulation objects include the simulation objects that should adopt the electromagnetic transient model or the electromechanical transient model; The pre-generated simulation object model classifier establishes a non-linear mapping relationship between the characteristic quantities of the analysis and calculation scenario and the difference states of the simulation results under the two types of models of the electromagnetic transient model or the electromechanical transient model adopted by the simulation object; the difference states of the simulation results are divided into two categories: significant difference in simulation results and small difference in simulation results. When the simulation object model classifier determines that the difference in simulation results is significant, the output information is: the simulation object should adopt the electromagnetic transient model. When the classifier determines that the difference in simulation results is small, the output information is: the simulation object adopts the electromechanical transient model; The specific method for evaluating and distinguishing the difference states of the simulation results under the two types of models is as follows: (1) The simulation object i uses an electromagnetic transient model. Considering the influence of disturbance k, transient time-domain simulation is carried out to obtain the trajectory of the key physical quantities output by the simulation object i to the power grid through the grid connection port - EMTU ik (l), where l corresponds to the output count of the electromechanical transient simulation; (2) The simulation object i adopts an electromechanical transient model, taking into account the influence of disturbance k, with other simulation conditions remaining unchanged, and conducts a transient time-domain simulation to obtain the physical quantity trajectory II RMSU output by the simulation object i to the power grid through the grid connection port. ik (l); (3) Calculate the simulation difference index between the electromagnetic transient model and the electromechanical transient model. ΔUmax ik It is the maximum difference in the trajectories of the key physical quantities output from the grid connection port to the power grid when the simulation object i adopts the electromagnetic transient model and the electromechanical transient model respectively, considering the influence of disturbance k. lm is the maximum number of outputs of the electromechanical transient simulation. (4) If ΔUmax ik > ΔUth, the simulation results have significant differences, and the electromagnetic transient model should be adopted for the simulation object i; otherwise, if ΔUmax ik ≤ ΔUth, the simulation results have small differences, and the electromechanical transient model is adopted for the simulation object i, where ΔUth is the difference threshold value; According to the output result of the simulation object model classifier, the simulation objects in the hybrid simulation adopt the corresponding electromagnetic transient model or electromechanical transient model for transient time-domain simulation.

2. The electromagnetic and electromechanical transient hybrid simulation method according to claim 1, wherein: The extraction method of the characteristic quantity GS of the grid operation state is: The grid-connected bus of simulation object i is j. Based on the power flow calculation results under the pre-disturbance condition, calculate the power supply voltage of the single-port Thevenin equivalent circuit parameters of bus j facing the power grid and impedance Z ij0 , and the grid operation state characteristic quantities of simulation object i are and impedance Z ij0 .

3. The electromagnetic and electromechanical transient hybrid simulation method according to claim 1, wherein: The extraction method of the characteristic quantity DS of the disturbance pattern is: For the disturbance \(k\) of the simulation object \(i\), considering the influence of the disturbance, calculate the parameters of the single-port Thevenin equivalent circuit of bus \(j\) facing the power grid, i.e., the power supply voltage and the impedance \(Z\) ijk , and obtain the disturbance morphological characteristic quantities as follows: and \(\Delta Z\) ik \(=\ Z\) ijk \(- Z\) ij0 , is the change in the power supply voltage of the single-port Thevenin equivalent circuit parameters of bus \(j\) facing the power grid caused by the disturbance \(k\), and \(\Delta Z\) ik is the change in the power supply impedance of the single-port Thevenin equivalent circuit parameters of bus \(j\) facing the power grid caused by the disturbance \(k\).

4. The electromagnetic and electromechanical transient hybrid simulation method according to claim 1, wherein: According to the categories n of security and stability issues concerned in the simulation analysis and calculation scenarios TGl , generate classifiers n of corresponding types based on offline training TCl , and the corresponding relationships are as follows: Power angle stability problem and power oscillation problem TGl = 1, then the power type classifier TCl = 1; Frequency safety and stability issues n TGl = 2, then the frequency-based classifier n TCl = 2; Voltage security and stability issues n TGl = 3, then the voltage type classifier n TCl = 3; Multiple types of security and stability issues n TGl = 4, then the comprehensive classifier n TCl = 4.

5. The electromagnetic and electromechanical transient hybrid simulation method according to claim 1, wherein: Extract the trajectory of key physical quantity - EMTU ik (l) and the trajectory of key physical quantity - RMSU il (l) The specific situation is determined by classifier n TCl The type is determined as follows: Power classifier n TCl When = 1, select the active power P output by the simulation object to the power grid ik (l), the corresponding electromagnetic transient model simulation is marked as EMTP ik (l), the corresponding electromechanical transient model simulation is marked as RMSP ik (l); Frequency classifier n TCl When = 2, select the active power P output by the simulation object to the power grid ik (l), the electromagnetic transient model simulation is marked as EMTP ik (l), the electromechanical transient model simulation is marked as RMSP ik (l); Voltage-type classifier n TCl When = 3, select the reactive power Q output by the simulation object to the power grid ik (l), and the simulation of the electromagnetic transient model is marked as EMTQ ik (l), and the simulation of the electromechanical transient model is marked as RMSQ ik (l); Comprehensive classifier n TCl When = 4, select the active power P output by the simulation object to the power grid ik (l) and the reactive power Q ik (l), and the active power EMTP of the electromagnetic model corresponding to the electromagnetic transient model simulation is marked ik (l) and the reactive power EMTQ of the electromagnetic model ik (l), and the active power RMSP of the electromechanical transient model corresponding to the electromechanical transient model simulation is marked ik (l) and the reactive power RMSQ of the electromechanical transient model ik (l).

6. The electromagnetic and electromechanical transient hybrid simulation method according to claim 1, wherein: Based on the input of the same power grid and disturbance scenario sample set, a multi-class classifier n is generated through offline training TGl , and the method is as follows: Input the grid operation state and disturbance pattern samples; Extract the characteristic quantities of the grid operation state and the characteristic quantities of the disturbance scenario; Taking into account the influence of disturbance k, the simulation object i adopts the electromagnetic transient model for transient time-domain simulation; Taking into account the influence of disturbance k, the simulation object i adopts the electromechanical transient model for transient time-domain simulation; According to the security and stability issues concerned in the simulation analysis and calculation scenarios, TGl the corresponding key physical quantity trajectories are extracted respectively; Evaluate the safety and stability issues n separately TGl The corresponding simulation result difference status, and determine the model type adopted by the simulation object.

7. The electromagnetic and electromechanical transient hybrid simulation method according to claim 1, wherein: The power grid security and stability issues concerned in the analysis and calculation scenario include: Power angle stability problem and power oscillation problem TGl = 1; Frequency safety and stability issues n TGl = 2; Voltage security and stability issues n TGl = 3; Multiple types of security and stability issues n TGl = 4.

8. The electromagnetic and electromechanical transient hybrid simulation method according to claim 1, wherein: For a specific simulation analysis task, the method for determining whether the simulation object i in the hybrid simulation should adopt the electromagnetic transient model or the electromechanical transient model is as follows: Input the power grid operation status information and disturbance scenario information corresponding to the simulation task, the types n of power grid security and stability problems concerned by the analysis and calculation scenario TGl and the simulation object i; Extract the characteristic quantity information GS of the power grid operation state for the simulation object i i and the characteristic quantity information DS of the disturbance scenario ik ; Based on the types of security and stability issues concerned in the simulation analysis calculation scenario n TGl , determine the type of classifier n TCl ; Characteristic quantity information GS of the power grid operating state i and disturbance scenario characteristic quantity information DS ik are input into classifier n TCl ; Classifier n TCl Output the judgment information on whether the simulation object i in the hybrid simulation should adopt the electromagnetic transient model or the electromechanical transient model.

9. An electromagnetic and electromechanical transient hybrid simulation system, characterized in that, It includes: Characteristic quantity information extraction module: Based on the grid operation state and disturbance pattern, extract the characteristic quantities of the grid operation state and the characteristic quantities of the disturbance scenario; Simulation object determination module: Input the power grid security and stability issues, the characteristic quantities of the grid operation state, and the characteristic quantities of the disturbance scenario concerned in the analysis and calculation scenario into the pre-generated simulation object model classifier to determine the simulation objects in the hybrid simulation, where the simulation objects include the simulation objects that should adopt the electromagnetic transient model or the electromechanical transient model; The pre-generated simulation object model classifier establishes a non-linear mapping relationship between the characteristic quantities of the analysis and calculation scenario and the difference states of the simulation results under two types of models, namely, the electromagnetic transient model and the electromechanical transient model, adopted by the simulation object. The difference states of the simulation results are divided into two categories: significant difference in simulation results and small difference in simulation results. When the simulation object model classifier determines that the difference in simulation results is significant, the output information is: the electromagnetic transient model should be adopted for the simulation object; when the classifier determines that the difference in simulation results is small, the output information is: the electromechanical transient model is adopted for the simulation object. The specific method for evaluating and distinguishing the difference states of the simulation results under the two types of models is as follows: (1) The simulation object i uses an electromagnetic transient model, takes into account the influence of disturbance k, conducts a transient time-domain simulation, and obtains the trajectory of the key physical quantities output by the simulation object i to the power grid through the grid connection port - EMTU ik (l), where l corresponds to the output count of the electromechanical transient simulation; (2) The simulation object i adopts an electromechanical transient model, taking into account the influence of disturbance k, with other simulation conditions remaining unchanged, and conducts a transient time-domain simulation to obtain the physical quantity trajectory II RMSU output by the simulation object i to the power grid through the grid connection port. ik (l); (3) Calculate the simulation difference index between the electromagnetic transient model and the electromechanical transient model. ΔUmax ik It is the maximum difference in the trajectories of the key physical quantities output from the grid connection port to the power grid when the simulation object i uses the electromagnetic transient model and the electromechanical transient model respectively, taking into account the influence of disturbance k. lm is the maximum number of outputs of the electromechanical transient simulation. (4) If ΔUmax ik > ΔUth, the simulation results are significantly different, and the electromagnetic transient model should be adopted for the simulation object i; otherwise, if ΔUmax ik ≤ ΔUth, the simulation results have little difference, and the electromechanical transient model is adopted for the simulation object i, where ΔUth is the difference threshold value; Time-domain simulation module: According to the output result of the simulation object model classifier, the simulation object in the hybrid simulation adopts the corresponding electromagnetic transient model or electromechanical transient model for transient time-domain simulation.

10. The electromagnetic and electromechanical transient hybrid simulation system according to claim 9, wherein: The extraction method of the grid operation state characteristic quantity GS is as follows: The grid-connected bus of simulation object i is j. Based on the power flow calculation results under the pre-disturbance condition, calculate the power supply voltage of the single-port Thevenin equivalent circuit parameters of bus j facing the power grid and impedance Z ij0 , and the grid operation state characteristic quantities of simulation object i are and impedance Z ij0 .

11. The electromagnetic and electromechanical transient hybrid simulation system according to claim 9, wherein: The extraction method of the disturbance form characteristic quantity DS is as follows: For the disturbance k of the simulation object i, considering the influence of the disturbance, calculate the power supply voltage of the single-port Thevenin equivalent circuit parameters of bus j facing the power grid and impedance Z ijk , and the disturbance morphological characteristic quantities are obtained as follows: and ΔZ ik = Z ijk - Z ij0 , is the change in the power supply voltage of the single-port Thevenin equivalent circuit parameters of bus j facing the power grid caused by the disturbance k, and ΔZ ik is the change in the power supply impedance of the single-port Thevenin equivalent circuit parameters of bus j facing the power grid caused by the disturbance k.

12. The electromagnetic and electromechanical transient hybrid simulation system according to claim 9, wherein: The pre-generated simulation object model classifier establishes a non-linear mapping relationship between the characteristic quantities of the analysis and calculation scenario and the difference states of the simulation results under two types of models, namely, the electromagnetic transient model and the electromechanical transient model, adopted by the simulation object.

13. A computer-readable storage medium storing one or more programs, the one or more programs including instructions that, when executed by a computing device, cause the computing device to execute the electromagnetic and electromechanical transient hybrid simulation method according to any one of claims 1-9.

14. A computing device, comprising one or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include instructions for executing the electromagnetic and electromechanical transient hybrid simulation method according to any one of claims 1-9.

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