Method and device for correcting electromechanical transient simulation model of wind farm

Abstract

The application discloses a kind of wind farm electromechanical transient simulation model correction method and device.Therein, the method includes: obtaining electromechanical transient simulation model needing to be checked;Electromechanical transient simulation is carried out on single-machine system using electromechanical transient simulation model, and first simulation result is obtained;Electromechanical transient simulation is carried out on actual power grid simulation system using electromechanical transient simulation model, and second simulation result is obtained;In the case where at least one electrical quantity deviation exceeds the corresponding deviation threshold in first simulation result and second simulation result, electromechanical transient simulation model is checked, and checking result is obtained;According to checking result, electromechanical transient simulation model is corrected, and the electromechanical transient simulation model after correction is obtained.The application solves the technical problem that simulation result and actual operation condition of power system are greatly deviated due to inaccurate electromechanical transient simulation calculation model of wind farm in related technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, in particular to a method and device for correcting a wind farm electromechanical transient simulation model. BACKGROUND

[0002] Power system safety and stability simulation calculation is an important means of power system operation mode arrangement. The accuracy of the electromechanical transient simulation calculation model of the wind farm has an important influence on the results of the power system safety and stability simulation calculation. If the electromechanical transient simulation calculation model of the wind farm is not accurate, it is easy to cause a large deviation between the simulation results and the actual operation of the power system, and further cause the power system operation mode arrangement to not meet the actual demand of the power system, and even threaten the safe and stable operation of the power system.

[0003] In view of the problem in the above related technologies that the inaccuracy of the electromechanical transient simulation calculation model of the wind farm leads to a large deviation between the simulation results and the actual operation of the power system, no effective solution has been proposed so far. SUMMARY

[0004] The embodiments of the present application provide a method and device for correcting a wind farm electromechanical transient simulation model, to at least solve the technical problem in the related technologies that the inaccuracy of the electromechanical transient simulation calculation model of the wind farm leads to a large deviation between the simulation results and the actual operation of the power system.

[0005] According to an aspect of the embodiments of the present application, a method for calibrating an electromechanical transient simulation model of a wind farm is provided. The method comprises: obtaining an electromechanical transient simulation model to be calibrated, wherein the electromechanical transient simulation model is used to simulate and analyze dynamic response and transient behavior of a generator set of the wind farm during operation; constructing a single-machine system of the wind farm to perform electromechanical transient simulation on the single-machine system by using the electromechanical transient simulation model to obtain a first simulation result, wherein the single-machine system refers to the wind farm as an independent power system unit in simulation; connecting the wind farm to an actual power grid simulation system to perform electromechanical transient simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a second simulation result, wherein the actual power grid simulation system refers to the wind farm as a component connected to a real power grid model in simulation; performing calibration on the electromechanical transient simulation model to obtain a calibration result when at least one of the first simulation result and the second simulation result has an electrical quantity deviation exceeding a corresponding deviation threshold, wherein the electrical quantity deviation refers to a deviation between a simulation output value of an electrical quantity of the wind farm and a corresponding electrical quantity threshold, the electrical quantity is used to evaluate accuracy of the electromechanical transient simulation model, each electrical quantity corresponds to an electrical quantity threshold, and each electrical quantity deviation corresponds to a deviation threshold; and calibrating the electromechanical transient simulation model according to the calibration result to obtain a calibrated electromechanical transient simulation model, so that a third simulation result of the calibrated electromechanical transient simulation model in stability simulation of the wind farm has a deviation less than a deviation threshold from an actual operation result of the wind farm.

[0006] Optionally, the method further comprises: constructing a single-machine infinite system and a single-machine load system of the wind farm, wherein the single-machine infinite system and the single-machine load system belong to the single-machine system; performing fault-free simulation on the single-machine infinite system by using the electromechanical transient simulation model to obtain a first simulation sub-result, wherein the fault-free simulation belongs to the electromechanical transient simulation; performing transient short-circuit fault simulation on the single-machine infinite system by using the electromechanical transient simulation model to obtain a second simulation sub-result, wherein the transient short-circuit fault simulation belongs to the electromechanical transient simulation; performing transient short-circuit fault simulation on the single-machine load system by using the electromechanical transient simulation model to obtain a third simulation sub-result; and performing load shedding small disturbance fault simulation on the single-machine load system by using the electromechanical transient simulation model to obtain a fourth simulation sub-result, wherein the load shedding small disturbance fault simulation belongs to the electromechanical transient simulation.

[0007] Optionally, the wind farm is connected to an actual power grid simulation system, and electromechanical transient simulation is performed on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a second simulation result, including: connecting the wind farm to the actual power grid simulation system; performing single-circuit line three-phase short-circuit fault trip simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a fifth simulation sub-result, wherein the single-circuit line three-phase short-circuit fault trip simulation belongs to the electromechanical transient simulation; performing DC system single-machine blocking fault simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a sixth simulation sub-result, wherein the DC system single-machine blocking fault simulation belongs to the electromechanical transient simulation; and performing wind farm repeated low-voltage ride-through fault simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a seventh simulation sub-result, wherein the wind farm repeated low-voltage ride-through fault simulation belongs to the electromechanical transient simulation.

[0008] Optionally, in the case that at least one of the electrical quantity deviations in the first simulation result and the second simulation result exceeds the corresponding deviation threshold, the electromechanical transient simulation model is checked to obtain a checking result, including: determining the electrical quantity whose deviation exceeds the corresponding deviation threshold as an abnormal electrical quantity according to the first simulation result and the second simulation result, and obtaining an abnormal number of all the abnormal electrical quantities; comparing the abnormal number with a predetermined number to obtain a comparison result; generating a checking strategy for checking the electromechanical transient simulation model according to the comparison result; and checking the electromechanical transient simulation model according to the checking strategy to obtain the checking result.

[0009] Optionally, generating a checking strategy for checking the electromechanical transient simulation model according to the comparison result includes: in the case that the comparison result indicates that the abnormal number is not greater than the predetermined number, determining the checking strategy as checking the model parameters of a sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model; and in the case that the comparison result indicates that the abnormal number is greater than the predetermined number, determining the checking strategy as checking the model parameters of each sub-model in the electromechanical transient simulation model in a predetermined order, wherein the predetermined order is a checking order of each sub-model.

[0010] Optionally, checking the model parameters of a sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model includes: determining the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model as a target sub-model; and checking the model parameters in the target sub-model in sequence.

[0011] Optionally, the method further comprises: in the case that the abnormal electrical quantity is voltage, determining that a wind turbine generator motor and converter primary system model, a wind power model and a wind turbine shaft system model in the electromechanical transient simulation model are the target sub-models; in the case that the abnormal electrical quantity is voltage, determining that an active power control model in a normal state, an active power control model during and after voltage ride through, a reactive power control model in a normal state, a reactive power control model during and after voltage ride through in the electromechanical transient simulation model are the target sub-models; in the case that the abnormal electrical quantity is voltage, determining that the active power control model in the normal state, the active power control model during and after voltage ride through, a voltage ride through state judgment model in the electromechanical transient simulation model are the target sub-models; in the case that the abnormal electrical quantity is voltage, determining that the reactive power control model in the normal state, the reactive power control model during and after voltage ride through, the voltage ride through state judgment model in the electromechanical transient simulation model are the target sub-models; in the case that the abnormal electrical quantity is voltage, determining that a frequency control model in the electromechanical transient simulation model is the target sub-model.

[0012] Optionally, the method further comprises: preferentially checking the sub-models containing priority model parameters, wherein the priority model parameters at least include dead zone parameters, limiting amplitude parameters and proportional-integral-derivative controller (PID) parameters.

[0013] According to another aspect of the embodiments of the present application, a device for calibrating an electromechanical transient simulation model of a wind farm is also provided, comprising: a first obtaining unit configured to obtain an electromechanical transient simulation model to be calibrated, wherein the electromechanical transient simulation model is used to simulate and analyze dynamic response and transient behavior of a generator set of the wind farm during operation; a second obtaining unit configured to construct a single-machine system of the wind farm, so as to perform electromechanical transient simulation on the single-machine system by using the electromechanical transient simulation model to obtain a first simulation result, wherein the single-machine system refers to the wind farm as an independent power system unit in simulation; a third obtaining unit configured to connect the wind farm to an actual power grid simulation system, so as to perform electromechanical transient simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a second simulation result, wherein the actual power grid simulation system refers to the wind farm as a component connected to a real power grid model in simulation; a fourth obtaining unit configured to calibrate the electromechanical transient simulation model when at least one of the first simulation result and the second simulation result has an electrical quantity deviation exceeding a corresponding deviation threshold, to obtain a calibration result, wherein the electrical quantity deviation refers to a deviation between a simulation output value of an electrical quantity of the wind farm and a corresponding electrical quantity threshold, the electrical quantity is used to evaluate accuracy of the electromechanical transient simulation model, each of the electrical quantities corresponds to an electrical quantity threshold, and each of the electrical quantity deviations corresponds to a deviation threshold; and a fifth obtaining unit configured to correct the electromechanical transient simulation model according to the calibration result to obtain a corrected electromechanical transient simulation model, so that a third simulation result of the corrected electromechanical transient simulation model for stability simulation of the wind farm has a deviation less than a deviation threshold from an actual operation result of the wind farm.

[0014] Optionally, the second obtaining unit comprises: a construction module configured to construct a single-machine infinite system and a single-machine load system of the wind farm, wherein the single-machine infinite system and the single-machine load system both belong to the single-machine system; a first obtaining module configured to perform fault-free simulation on the single-machine infinite system by using the electromechanical transient simulation model to obtain a first simulation sub-result, wherein the fault-free simulation belongs to the electromechanical transient simulation; a second obtaining module configured to perform transient short-circuit fault simulation on the single-machine infinite system by using the electromechanical transient simulation model to obtain a second simulation sub-result, wherein the transient short-circuit fault simulation belongs to the electromechanical transient simulation; a third obtaining module configured to perform transient short-circuit fault simulation on the single-machine load system by using the electromechanical transient simulation model to obtain a third simulation sub-result; and a fourth obtaining module configured to perform load shedding small disturbance fault simulation on the single-machine load system by using the electromechanical transient simulation model to obtain a fourth simulation sub-result, wherein the load shedding small disturbance fault simulation belongs to the electromechanical transient simulation.

[0015] Optionally, the third obtaining unit comprises: an access module, configured to access the actual power grid simulation system; a fifth obtaining module, configured to perform single-circuit line three-phase short-circuit fault tripping simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a fifth simulation sub-result, wherein the single-circuit line three-phase short-circuit fault tripping simulation belongs to the electromechanical transient simulation; a sixth obtaining module, configured to perform DC system single-machine blocking fault simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a sixth simulation sub-result, wherein the DC system single-machine blocking fault simulation belongs to the electromechanical transient simulation; and a seventh obtaining module, configured to perform wind farm repeated low-voltage ride-through fault simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a seventh simulation sub-result, wherein the wind farm repeated low-voltage ride-through fault simulation belongs to the electromechanical transient simulation.

[0016] Optionally, the fourth obtaining unit comprises: an eighth obtaining module, configured to determine, according to the first simulation result and the second simulation result, the electrical quantity whose deviation exceeds the corresponding deviation threshold as an abnormal electrical quantity, and obtain an abnormal quantity of all the abnormal electrical quantities; a ninth obtaining module, configured to compare the abnormal quantity with a predetermined quantity to obtain a comparison result; a generation module, configured to generate, according to the comparison result, a checking strategy for checking the electromechanical transient simulation model; and a tenth obtaining module, configured to check the electromechanical transient simulation model according to the checking strategy to obtain the checking result.

[0017] Optionally, the generation module comprises: a first determining sub-module, configured to, in a case where the comparison result indicates that the abnormal quantity is not greater than the predetermined quantity, determine the checking strategy as checking model parameters of a sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model; and a second determining sub-module, configured to, in a case where the comparison result indicates that the abnormal quantity is greater than the predetermined quantity, determine the checking strategy as checking the model parameters of each sub-model in the electromechanical transient simulation model in a predetermined order, wherein the predetermined order is a checking order of the sub-models.

[0018] Optionally, the first determining sub-module comprises: a third determining sub-module, configured to determine the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model as a target sub-model; and a first checking sub-module, configured to check the model parameters in the target sub-model in sequence.

[0019] Optionally, the third determining sub-module comprises: a fourth determining sub-module, configured to determine, in the case that the abnormal electrical quantity is voltage, a wind turbine motor and converter primary system model, a wind power model, and a wind turbine shaft system model in the electromechanical transient simulation model as the target sub-model; a fifth determining sub-module, configured to determine, in the case that the abnormal electrical quantity is voltage, an active power control model in a normal state, an active power control model during and after voltage ride-through, a reactive power control model in a normal state, and a reactive power control model during and after voltage ride-through in the electromechanical transient simulation model as the target sub-model; a sixth determining sub-module, configured to determine, in the case that the abnormal electrical quantity is voltage, the active power control model in the normal state, the active power control model during and after voltage ride-through, and a voltage ride-through state judgment model in the electromechanical transient simulation model as the target sub-model; a seventh determining sub-module, configured to determine, in the case that the abnormal electrical quantity is voltage, the reactive power control model in the normal state, the reactive power control model during and after voltage ride-through, and the voltage ride-through state judgment model in the electromechanical transient simulation model as the target sub-model; and an eighth determining sub-module, configured to determine, in the case that the abnormal electrical quantity is voltage, a frequency control model in the electromechanical transient simulation model as the target sub-model.

[0020] Optionally, the wind farm electromechanical transient simulation model correction device further comprises a second checking sub-module configured to preferentially check the sub-models containing priority model parameters, wherein the priority model parameters at least include a dead zone parameter, a limiting parameter, and a proportional-integral-derivative controller (PID) parameter.

[0021] According to another aspect of the embodiments of the present application, a wind farm electromechanical transient simulation model correction system is also provided, which uses any of the wind farm electromechanical transient simulation model correction methods described above.

[0022] According to another aspect of the embodiments of the present application, a computer readable storage medium is also provided, which comprises a stored program, wherein the program executes any of the wind farm electromechanical transient simulation model correction methods described above.

[0023] According to another aspect of the embodiments of the present application, a processor is also provided, which is used to run a program, wherein the program executes any of the wind farm electromechanical transient simulation model correction methods described above when running.

[0024] According to another aspect of the embodiments of the present application, a computer program product is also provided, which comprises computer instructions, wherein the computer instructions are executed by a processor to execute any of the wind farm electromechanical transient simulation model correction methods described above.

[0025] In the embodiment of the present application, an electromechanical transient simulation model that needs to be checked is obtained, wherein the electromechanical transient simulation model is used to simulate and analyze dynamic response and transient behavior of a generator set of a wind farm during operation; a single-machine system of the wind farm is constructed to perform electromechanical transient simulation on the single-machine system by using the electromechanical transient simulation model to obtain a first simulation result, wherein the single-machine system refers to the wind farm as an independent power system unit in simulation; the wind farm is connected to an actual power grid simulation system to perform electromechanical transient simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a second simulation result, wherein the actual power grid simulation system refers to the wind farm as a component connected to a real power grid model in simulation; in a case where at least one of the first simulation result and the second simulation result has an electrical quantity deviation exceeding a corresponding deviation threshold, the electromechanical transient simulation model is checked to obtain a checking result, wherein the electrical quantity deviation refers to a deviation between a simulation output value of an electrical quantity of the wind farm and a corresponding electrical quantity threshold, the electrical quantity is used to evaluate accuracy of the electromechanical transient simulation model, each electrical quantity corresponds to an electrical quantity threshold, and each electrical quantity deviation corresponds to a deviation threshold; the electromechanical transient simulation model is corrected according to the checking result to obtain a corrected electromechanical transient simulation model, so that a third simulation result of the corrected electromechanical transient simulation model in stability simulation of the wind farm has a deviation from an actual operation result of the wind farm less than the deviation threshold. Through the above technical solution, the purpose of simulating the wind farm by using the electromechanical transient simulation model in multiple simulation scenarios and analyzing and determining a problematic part in the electromechanical transient simulation model according to simulation results is achieved, a technical effect of correcting the electromechanical transient simulation model to reduce a deviation between a simulation result and an actual operation result of a power system is achieved, accuracy of the electromechanical transient simulation model is improved, and thus a technical problem that a simulation result deviates greatly from an actual operation result of a power system due to inaccuracy of an electromechanical transient simulation calculation model of a wind farm in related technologies is solved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0027] Figure 1 FIG. 1 is a hardware structure block diagram of a mobile terminal of a wind farm electromechanical transient simulation model correction method according to an embodiment of the present application;

[0028] Figure 2 FIG. 2 is a flowchart of a wind farm electromechanical transient simulation model correction method according to an embodiment of the present application;

[0029] Figure 3 is a flow chart of the optional correction method of the wind farm electromechanical transient simulation model according to the embodiment of the present application;

[0030] Figure 4 is a schematic diagram of the correction device of the wind farm electromechanical transient simulation model according to the embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiment of the present application will be described clearly and completely below in combination with the drawings in the embodiment of the present application. Obviously, the described embodiment is only a part of the embodiment of the present application, not all. Based on the embodiment in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0032] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0033] As introduced in the background, due to the inaccuracy of the electromechanical transient simulation calculation model of the wind farm in the related art, the simulation result deviates greatly from the actual operation of the power system. In view of the above defects, a correction method and device of the electromechanical transient simulation model of the wind farm are provided in the embodiment of the present application.

[0034] The technical scheme in the embodiment of the present application will be described clearly and completely below in combination with the drawings in the embodiment of the present application.

[0035] The method embodiment provided in the embodiment of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking the running on the mobile terminal as an example, Figure 1 is a hardware structure block diagram of a mobile terminal of the correction method of the wind farm electromechanical transient simulation model according to the embodiment of the present application. As Figure 1 shown, the mobile terminal can include one or more Figure 1The mobile terminal can further include a transmission device 106 for communication function and an input / output device 108. Those skilled in the art can understand that, Figure 1 The structure shown is only schematic, and does not limit the structure of the mobile terminal. For example, the mobile terminal can include more or less components than those shown, or have a different configuration of components. For example, Figure 1 The mobile terminal shown in the figure can include more or less components than those shown, or have a different configuration of components. Figure 1

[0036] The memory 104 can be used to store computer programs, such as software programs of application software and modules, such as the computer program corresponding to the correction method of the wind farm electromechanical transient simulation model in the embodiments of the present application. The processor 102 can execute various functional applications and data processing by running the computer programs stored in the memory 104, that is, implement the method described above. The memory 104 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include a memory remotely arranged with respect to the processor 102, and the remote memory can be connected to the mobile terminal through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific examples of the network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, NIC) which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (Radio Frequency, RF) module which is used to communicate with the Internet in a wireless manner.

[0037] According to the embodiments of the present application, a method embodiment of the correction method of the wind farm electromechanical transient simulation model is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a group of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0038] Figure 2 is a flowchart of the correction method of the wind farm electromechanical transient simulation model according to the embodiments of the present application, as Figure 2 shown, the method includes the following steps: ​

[0039] Step S202: Obtain the electromechanical transient simulation model that needs to be verified. The electromechanical transient simulation model is used to simulate and analyze the dynamic response and transient behavior of the generator set of the wind farm during operation.

[0040] In this embodiment, the electromechanical transient simulation model to be verified can be obtained first. This model mainly includes: the primary system model of the wind turbine generator and converter, the wind power model, the wind turbine shaft system model, the active power control model under normal conditions, the reactive power control model under normal conditions, the active and reactive current limiting model, the voltage ride-through state judgment model, the active power control model during and after the voltage ride-through, the reactive power control model during and after the voltage ride-through, the low voltage ride-through protection model, the frequency control model, etc. It can be understood that the electromechanical transient simulation model is a model obtained by combining or integrating these sub-models.

[0041] Step S204: Construct a single-unit system of the wind farm, and use an electromechanical transient simulation model to perform electromechanical transient simulation on the single-unit system to obtain the first simulation result. Here, the single-unit system refers to treating the wind farm as an independent power system unit in the simulation.

[0042] The following is combined Figure 3 The embodiments of the present invention will be described in detail below. Figure 3 This is a flowchart of an optional correction method for a wind farm electromechanical transient simulation model according to an embodiment of the present invention, such as... Figure 3 As shown, simulations can be performed first using an electromechanical transient simulation model based on a single-machine system, and the electromechanical transient simulation model can be verified based on the simulation results.

[0043] According to the above embodiments of the present invention, in step S204, a single-unit system of a wind farm is constructed to perform electromechanical transient simulation on the single-unit system using an electromechanical transient simulation model to obtain a first simulation result, including: constructing a single-unit infinite bus system and a single-unit loaded system of the wind farm, wherein both the single-unit infinite bus system and the single-unit loaded system belong to the single-unit system; performing a fault-free simulation on the single-unit infinite bus system using the electromechanical transient simulation model to obtain a first simulation sub-result, wherein the fault-free simulation belongs to the electromechanical transient simulation; performing a transient short-circuit fault simulation on the single-unit infinite bus system using the electromechanical transient simulation model to obtain a second simulation sub-result, wherein the transient short-circuit fault simulation belongs to the electromechanical transient simulation; performing a transient short-circuit fault simulation on the single-unit loaded system using the electromechanical transient simulation model to obtain a third simulation sub-result; and performing a load shedding small-disturbance fault simulation on the single-unit loaded system using the electromechanical transient simulation model to obtain a fourth simulation sub-result, wherein the load shedding small-disturbance fault simulation belongs to the electromechanical transient simulation.

[0044] As above Figure 3As shown, a single-machine infinite system and a single-machine load system of the wind farm can be constructed, then the electromechanical transient simulation model is used to perform fault-free simulation and transient short-circuit fault simulation on the single-machine infinite system, and to perform transient short-circuit fault simulation and load shedding small disturbance fault simulation on the single-machine load system, so as to check the electromechanical transient simulation model according to the simulation results.

[0045] Specifically, the single-machine infinite system of the wind farm is constructed, the initial operating conditions of the wind farm are set as voltage equal to rated voltage, active power equal to rated active power, reactive power equal to 0, and frequency equal to 50 Hz; then during the fault-free simulation of the single-machine infinite system, the simulation duration is set as 20 seconds, and the simulation result output curves of the electrical quantities such as voltage, current, active power, reactive power, and frequency of the wind farm are obtained through simulation; during the transient short-circuit fault simulation of the single-machine infinite system, the short-circuit fault point is selected at the outlet bus of the wind farm, the short-circuit time is set as 0.02 seconds, the simulation duration is set as 20 seconds, and the simulation result output curves of the electrical quantities such as voltage, current, active power, reactive power, and frequency of the wind farm are obtained through simulation; the single-machine load system of the wind farm is constructed, the initial operating conditions of the wind farm are set as voltage equal to rated voltage, active power equal to rated active power, reactive power equal to 0, and frequency equal to 50 Hz; then during the transient short-circuit fault simulation of the single-machine load system, the short-circuit fault point is selected at the outlet bus of the wind farm, the short-circuit time is set as 0.02 seconds, the simulation duration is set as 20 seconds, and the simulation result output curves of the electrical quantities such as voltage, current, active power, reactive power, and frequency of the wind farm are obtained through simulation; during the load shedding small disturbance fault simulation of the single-machine load system, the load shedding amount is set as not more than 5% of the total load, the simulation duration is set as 40 seconds, and the simulation result output curves of the electrical quantities such as voltage, current, active power, reactive power, and frequency of the wind farm are obtained through simulation.

[0046] In step S206, the wind farm is connected to an actual power grid simulation system, and the electromechanical transient simulation model is used to perform electromechanical transient simulation on the actual power grid simulation system to obtain a second simulation result, wherein the actual power grid simulation system refers to a real power grid model in which the wind farm is connected as a component.

[0047] As shown above Figure 3 The electromechanical transient simulation model can be used to perform simulation based on the simulation system of the actual power grid, so as to check the electromechanical transient simulation model according to the simulation results.

[0048] According to the above embodiment of the present application, in the step S206, the wind farm is connected to the actual power grid simulation system to perform electromechanical transient simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain the second simulation result, including: connecting the wind farm to the actual power grid simulation system; performing single-circuit line three-phase short-circuit fault trip simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a fifth simulation sub-result, wherein the single-circuit line three-phase short-circuit fault trip simulation belongs to electromechanical transient simulation; performing DC system single-machine blocking fault simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a sixth simulation sub-result, wherein the DC system single-machine blocking fault simulation belongs to electromechanical transient simulation; and performing wind farm repeated low-voltage ride-through fault simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a seventh simulation sub-result, wherein the wind farm repeated low-voltage ride-through fault simulation belongs to electromechanical transient simulation.

[0049] As shown above, the wind farm can be connected to the actual power grid simulation system, and then the electromechanical transient simulation model is used to perform single-circuit line three-phase short-circuit fault trip simulation, DC system single-machine blocking fault simulation and wind farm repeated low-voltage ride-through fault simulation on the actual power grid simulation system, so as to check the electromechanical transient simulation model according to the simulation result. Figure 3 Specifically, when the wind farm is connected to the actual power grid simulation system, the position of the connected power grid is set according to the actual connection position of the wind farm, and the initial operating conditions of the wind farm can be set as voltage equal to rated voltage, active power equal to rated active power, reactive power equal to 0, and frequency equal to 50 Hz; then when the electromechanical transient simulation model is used to perform single-circuit line three-phase short-circuit fault trip simulation on the actual power grid simulation system, a certain circuit near the location of the wind farm can be selected as the line, a certain end of the line can be selected as the three-phase short-circuit fault point, the short-circuit time can be set to 0.1 seconds, the simulation duration can be set to 20 seconds, and the simulation result output curves of the voltage, current, active power, reactive power and frequency of the wind farm are obtained through simulation; when the DC system single-machine blocking fault simulation is performed on the actual power grid simulation system, a certain DC near the wind farm can be selected, the simulation duration can be set to 40 seconds, and the simulation result output curves of the voltage, current, active power, reactive power and frequency of the wind farm are obtained through simulation; and when the wind farm repeated low-voltage ride-through fault simulation is performed on the actual power grid simulation system, the outlet bus voltage of the wind farm can be adjusted to about 92% of the rated voltage, a certain load near the wind farm is repeatedly put into and taken out to make the wind farm enter the low-voltage ride-through state, the simulation duration can be set to 60 seconds, and the simulation result output curves of the voltage, current, active power, reactive power and frequency of the wind farm are obtained through simulation.

[0050]

[0051] ​Here, after performing electromechanical transient simulation on a single-machine system using an electromechanical transient simulation model, an electromechanical transient simulation is then performed on an actual power grid simulation system. This can further identify errors in parameter settings that were not identified when performing electromechanical transient simulation on a single-machine system using the electromechanical transient simulation model, such as setting parameters that are too large or too small. In particular, errors in parameter settings that are too large or too small in the dead zone, limiting, and PID loops can be identified. This allows for a more comprehensive verification of the electromechanical transient simulation model.

[0052] Step S208: If at least one electrical quantity deviation in the first simulation result and the second simulation result exceeds the corresponding deviation threshold, the electromechanical transient simulation model is checked to obtain the check result. Here, the electrical quantity deviation refers to the deviation between the simulated output value of the electrical quantity of the wind farm and the corresponding electrical quantity threshold. The electrical quantity is used to evaluate the accuracy of the electromechanical transient simulation model. Each electrical quantity corresponds to an electrical quantity threshold, and each electrical quantity deviation corresponds to a deviation threshold.

[0053] In this embodiment, by using the electromechanical transient simulation model to simulate different systems under various scenarios through the above steps S204 and S206, the electromechanical transient simulation model can be more comprehensively verified.

[0054] Specifically, each simulation involved in steps S204 and S206 above will yield corresponding simulation results. These results include simulation output curves for electrical quantities such as voltage, current, active power, reactive power, and frequency of the wind farm. Whether an electrical anomaly exists can be determined by analyzing whether the deviation between the simulation output values ​​of these electrical quantities and their corresponding threshold values ​​exceeds the deviation threshold. Taking the calculation of the voltage simulation output curve deviation as an example, the formula is as follows: U i This is the i-th simulation data, U e This is the rated voltage (i.e., the threshold value of the electrical quantity voltage; the threshold values ​​of other electrical quantities are also their rated values), n is the total number of simulation data, ΔU refers to the voltage deviation, and the calculation method for the deviation of the other electrical quantities is the same as that for voltage, so it will not be elaborated here. The deviation threshold value corresponding to each electrical quantity is 1% of the rated value of that electrical quantity, as follows: the deviation threshold value corresponding to voltage is 1% of the rated voltage, the deviation threshold value corresponding to current is 1% of the rated current, the deviation threshold value corresponding to active power is 1% of the rated active power, the deviation threshold value corresponding to reactive power is 1% of the rated reactive power, and the deviation threshold value corresponding to frequency is 1% of the rated frequency.

[0055] According to the above embodiment of the present application, in the step S208, when there is at least one electrical quantity deviation exceeding the corresponding deviation threshold in the first simulation result and the second simulation result, the electromechanical transient simulation model is checked to obtain a checking result, including: determining the electrical quantity deviating from the corresponding deviation threshold as an abnormal electrical quantity according to the first simulation result and the second simulation result, and obtaining the abnormal number of all abnormal electrical quantities; comparing the abnormal number with the predetermined number to obtain a comparison result; generating a checking strategy for checking the electromechanical transient simulation model according to the comparison result; and checking the electromechanical transient simulation model according to the checking strategy to obtain the checking result.

[0056] In this embodiment, if the electrical quantity deviation of an electrical quantity exceeds the corresponding deviation threshold in at least one simulation scenario, it is considered that the electrical quantity deviation of the electrical quantity exceeds the corresponding deviation threshold, that is, the electrical quantity is abnormal; in these electrical quantities, when at least one electrical quantity is abnormal, that is, at least one electrical quantity is an abnormal electrical quantity, it is considered that the electromechanical transient simulation model has a problem and needs to be checked; then, a corresponding checking strategy can be generated according to the number of abnormal electrical quantities, and the electromechanical transient simulation model is checked according to the checking strategy to obtain a checking result.

[0057] In a specific embodiment of the present application, the checking strategy for checking the electromechanical transient simulation model is generated according to the comparison result, including: when the comparison result indicates that the abnormal number is not greater than the predetermined number, determining that the checking strategy is to check the model parameters of the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model; and when the comparison result indicates that the abnormal number is greater than the predetermined number, determining that the checking strategy is to check the model parameters of each sub-model in the electromechanical transient simulation model in a predetermined order, wherein the predetermined order is the checking order of each sub-model.

[0058] In this embodiment, if the electrical quantity deviating from the threshold is only 1-2 (here, 2 is taken as the predetermined number as an example, of course, other numbers can be selected as the predetermined number according to actual conditions, which is not limited here), the model parameters of the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model can be checked; if the electrical quantity deviating from the threshold is more than 2, the model parameters of each sub-model in the electromechanical transient simulation model can be checked in sequence.

[0059] In the case that the number of abnormal electrical quantities is more than 2, the parameters in each sub-model can be checked one by one in the following order (predetermined order): active power control model during and after voltage ride-through, reactive power control model during and after voltage ride-through, voltage ride-through state judgment model, frequency control model, low voltage ride-through protection model, active power control model in normal state, reactive power control model in normal state, active and reactive current limit model, wind turbine generator motor and converter primary system model, wind power model, and wind turbine shaft system model. It should be noted that the predetermined order can be determined according to actual conditions, and is not specifically limited herein.

[0060] In the above embodiment of the present application, the model parameters of the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model are checked, including: determining the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model as a target sub-model; and checking the model parameters in the target sub-model one by one.

[0061] In this embodiment, when the number of abnormal electrical quantities is not more than 2, the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model can be determined as a target sub-model first, and then the model parameters of the target sub-model are checked one by one.

[0062] Specifically, according to the above embodiment of the present application, the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model is determined as a target sub-model, including: in the case that the abnormal electrical quantity is voltage, determining the wind turbine generator motor and converter primary system model, wind power model, and wind turbine shaft system model in the electromechanical transient simulation model as the target sub-model; in the case that the abnormal electrical quantity is voltage, determining the active power control model in normal state, active power control model during and after voltage ride-through, reactive power control model in normal state, and reactive power control model during and after voltage ride-through in the electromechanical transient simulation model as the target sub-model; in the case that the abnormal electrical quantity is voltage, determining the active power control model in normal state, active power control model during and after voltage ride-through, and voltage ride-through state judgment model in the electromechanical transient simulation model as the target sub-model; in the case that the abnormal electrical quantity is voltage, determining the reactive power control model in normal state, reactive power control model during and after voltage ride-through, and voltage ride-through state judgment model in the electromechanical transient simulation model as the target sub-model; and in the case that the abnormal electrical quantity is voltage, determining the frequency control model in the electromechanical transient simulation model as the target sub-model.

[0063] Specifically, when the voltage deviation exceeds the corresponding deviation threshold, the wind turbine generator motor and converter primary system model, the wind power model, and the wind turbine shafting model in the electromechanical transient simulation model can be determined as the target sub-models; when the current deviation exceeds the corresponding deviation threshold, the active power control model in normal state, the active power control model during and after voltage ride-through, the reactive power control model in normal state, the reactive power control model during and after voltage ride-through in the electromechanical transient simulation model can be determined as the target sub-models; when the active power deviation exceeds the corresponding deviation threshold, the active power control model in normal state, the active power control model during and after voltage ride-through, and the voltage ride-through state judgment model in the electromechanical transient simulation model can be determined as the target sub-models; when the reactive power deviation exceeds the corresponding deviation threshold, the reactive power control model in normal state, the reactive power control model during and after voltage ride-through, and the voltage ride-through state judgment model in the electromechanical transient simulation model can be determined as the target sub-models; and when the frequency deviation exceeds the corresponding deviation threshold, the frequency control model in the electromechanical transient simulation model can be determined as the target sub-model.

[0064] In an optional embodiment of the present application, the correction method of the electromechanical transient simulation model of the wind farm further comprises: preferentially correcting the sub-models containing priority model parameters, wherein the priority model parameters at least include: dead zone parameters, limiting amplitude parameters, and proportional-integral-derivative controller (PID) parameters.

[0065] In this embodiment, when the sub-models in the electromechanical transient simulation model that need to be corrected are corrected, the sub-models containing the dead zone parameters, the limiting amplitude parameters, and the proportional-integral-derivative controller (PID) parameters can be preferentially corrected; specifically, the influence of the changes of each parameter on the simulation results can be observed by increasing or decreasing the dead zone parameters, increasing or decreasing the limiting amplitude parameters, increasing or decreasing the amplification multiple of the proportional link in the PID parameters, increasing or decreasing the amplification multiple of the differential link in the PID parameters, and increasing or decreasing the amplification multiple of the integral link in the PID parameters, and if the modification of one or several of the above parameters can obviously change the simulation results, these parameters can be located as problematic parameters.

[0066] In step S210, the electromechanical transient simulation model is corrected according to the correction result to obtain a corrected electromechanical transient simulation model, so that the deviation between the third simulation result of the corrected electromechanical transient simulation model for the stability simulation of the wind farm and the actual operation result of the wind farm is less than the deviation threshold.

[0067] As described above Figure 3As shown, in this embodiment, the sub-models with problems in the electromechanical transient simulation model can be corrected according to the checking result, so as to improve the accuracy of the electromechanical transient simulation model, thereby reducing the deviation between the simulation result of the stability simulation of the wind farm by using the electromechanical transient simulation model and the actual operation condition of the power grid, and improving the stability of the power system operation.

[0068] As can be seen from the above, the technical scheme provided by the above embodiment of the present application can obtain an electromechanical transient simulation model that needs to be checked, wherein the electromechanical transient simulation model is used to simulate and analyze the dynamic response and transient behavior of the generator set of the wind farm during operation; a single-machine system of the wind farm is constructed to perform electromechanical transient simulation on the single-machine system by using the electromechanical transient simulation model to obtain a first simulation result, wherein the single-machine system refers to the wind farm as an independent power system unit in simulation; the wind farm is connected to an actual power grid simulation system to perform electromechanical transient simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a second simulation result, wherein the actual power grid simulation system refers to the wind farm as a component connected to a real power grid model in simulation; when at least one of the electrical quantity deviations in the first simulation result and the second simulation result exceeds the corresponding deviation threshold, the electromechanical transient simulation model is checked to obtain a checking result, wherein the electrical quantity deviation refers to the deviation between the simulation output value of the electrical quantity of the wind farm and the corresponding electrical quantity threshold, the electrical quantity is used to evaluate the accuracy of the electromechanical transient simulation model, each electrical quantity corresponds to an electrical quantity threshold, and each electrical quantity deviation corresponds to a deviation threshold; the electromechanical transient simulation model is corrected according to the checking result to obtain a corrected electromechanical transient simulation model, so that the deviation between the third simulation result of the stability simulation of the wind farm by using the corrected electromechanical transient simulation model and the actual operation result of the wind farm is less than the deviation threshold, thereby achieving the purpose of simulating the wind farm by using the electromechanical transient simulation model in multiple simulation scenarios, and analyzing and determining the problematic part in the electromechanical transient simulation model according to the simulation result to correct and modify it, and realizing the technical effect of correcting the electromechanical transient simulation model to reduce the deviation between its simulation result and the actual operation condition of the power system, and improving the accuracy of the electromechanical transient simulation model.

[0069] Therefore, the technical scheme provided by the above embodiment of the present application solves the technical problem in the related art that the deviation between the simulation result and the actual operation condition of the power system is large due to the inaccuracy of the electromechanical transient simulation calculation model of the wind farm.

[0070] It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all described as a series of action combinations, but those skilled in the art should know that the present application is not limited to the action sequence described, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0071] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be realized by means of software and a necessary general hardware platform, and of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, an optical disk), and includes a plurality of instructions for causing a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the method described in each embodiment of the present application.

[0072] According to the embodiments of the present application, a wind farm electromechanical transient simulation model correction device for implementing the above-mentioned wind farm electromechanical transient simulation model correction method is also provided, Figure 4 is a schematic diagram of the wind farm electromechanical transient simulation model correction device according to the embodiments of the present application, as Figure 4 shown, the device includes a first acquisition unit 41, a second acquisition unit 43, a third acquisition unit 45, a fourth acquisition unit 47, and a fifth acquisition unit 49. The wind farm electromechanical transient simulation model correction device will be described in detail below.

[0073] The first acquisition unit 41 is configured to acquire an electromechanical transient simulation model that needs to be checked, wherein the electromechanical transient simulation model is used to simulate and analyze the dynamic response and transient behavior of the generator set of the wind farm during operation.

[0074] The second acquisition unit 43 is configured to construct a single-machine system of the wind farm, so as to perform electromechanical transient simulation on the single-machine system by using the electromechanical transient simulation model to obtain a first simulation result, wherein the single-machine system refers to treating the wind farm as an independent power system unit in simulation.

[0075] The third acquisition unit 45 is configured to connect the wind farm to an actual power grid simulation system, so as to perform electromechanical transient simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a second simulation result, wherein the actual power grid simulation system refers to connecting the wind farm as a component to a real power grid model in simulation.

[0076] The fourth obtaining unit 47 is configured to check the electromechanical transient simulation model when at least one of the electrical quantity deviations exceeds the corresponding deviation threshold value in the first simulation result and the second simulation result, to obtain a checking result, wherein the electrical quantity deviation refers to a deviation between a simulation output value of an electrical quantity of the wind farm and a corresponding electrical quantity threshold value, the electrical quantity is used to evaluate the accuracy of the electromechanical transient simulation model, each electrical quantity corresponds to an electrical quantity threshold value, and each electrical quantity deviation corresponds to a deviation threshold value.

[0077] The fifth obtaining unit 49 is configured to correct the electromechanical transient simulation model according to the checking result, to obtain a corrected electromechanical transient simulation model, so that a deviation between a third simulation result of the corrected electromechanical transient simulation model in the stability simulation of the wind farm and an actual operation result of the wind farm is less than a deviation threshold value.

[0078] It should be noted that the first obtaining unit 41, the second obtaining unit 43, the third obtaining unit 45, the fourth obtaining unit 47, and the fifth obtaining unit 49 correspond to steps S202 to S210 in the above embodiment, and the five units have the same instances and application scenarios as the corresponding steps, but are not limited to the content disclosed in the above embodiment.

[0079] From the above, in the scheme described in the above embodiments of the present application, the first acquisition unit can be used to acquire the electromechanical transient simulation model that needs to be checked, wherein the electromechanical transient simulation model is used to simulate and analyze the dynamic response and transient behavior of the generator set of the wind farm during operation; then the second acquisition unit is used to build a single-machine system of the wind farm, so as to use the electromechanical transient simulation model to electromechanically simulate the single-machine system to obtain a first simulation result, wherein the single-machine system refers to the wind farm as an independent power system unit in simulation; then the third acquisition unit is used to connect the wind farm to an actual power grid simulation system, so as to use the electromechanical transient simulation model to electromechanically simulate the actual power grid simulation system to obtain a second simulation result, wherein the actual power grid simulation system refers to the wind farm as a component connected to a real power grid model in simulation; then the fourth acquisition unit is used to check the electromechanical transient simulation model when at least one of the electrical quantity deviations between the first simulation result and the second simulation result exceeds the corresponding deviation threshold, to obtain a checking result, wherein the electrical quantity deviation refers to the deviation between the simulation output value of the electrical quantity of the wind farm and the corresponding electrical quantity threshold, the electrical quantity is used to evaluate the accuracy of the electromechanical transient simulation model, each electrical quantity corresponds to an electrical quantity threshold, and each electrical quantity deviation corresponds to a deviation threshold; finally, the fifth acquisition unit is used to correct the electromechanical transient simulation model according to the checking result to obtain a corrected electromechanical transient simulation model, so that the deviation between the third simulation result of the corrected electromechanical transient simulation model simulating the stability of the wind farm and the actual operation result of the wind farm is less than the deviation threshold, thereby achieving the purpose of simulating the wind farm by using the electromechanical transient simulation model in multiple simulation scenarios, analyzing and determining the problematic part in the electromechanical transient simulation model according to the simulation result, checking and correcting the electromechanical transient simulation model, realizing the technical effect of correcting the electromechanical transient simulation model to reduce the deviation between the simulation result and the actual operation of the power system, and improving the accuracy of the electromechanical transient simulation model.

[0080] Therefore, the technical scheme provided by the above embodiments of the present application solves the technical problem that the deviation between the simulation result and the actual operation of the power system is large due to the inaccuracy of the electromechanical transient simulation calculation model of the wind farm in the related art.

[0081] Optionally, the second obtaining unit comprises: a constructing module, configured to construct a single-machine infinite system and a single-machine load system of the wind farm, wherein the single-machine infinite system and the single-machine load system both belong to single-machine systems; a first obtaining module, configured to perform fault-free simulation on the single-machine infinite system by using the electromechanical transient simulation model, to obtain a first simulation sub-result, wherein the fault-free simulation belongs to electromechanical transient simulation; a second obtaining module, configured to perform instantaneous short-circuit fault simulation on the single-machine infinite system by using the electromechanical transient simulation model, to obtain a second simulation sub-result, wherein the instantaneous short-circuit fault simulation belongs to electromechanical transient simulation; a third obtaining module, configured to perform instantaneous short-circuit fault simulation on the single-machine load system by using the electromechanical transient simulation model, to obtain a third simulation sub-result; and a fourth obtaining module, configured to perform load-shedding small disturbance fault simulation on the single-machine load system by using the electromechanical transient simulation model, to obtain a fourth simulation sub-result, wherein the load-shedding small disturbance fault simulation belongs to electromechanical transient simulation.

[0082] Optionally, the third obtaining unit comprises: an accessing module, configured to access the wind farm into an actual power grid simulation system; a fifth obtaining module, configured to perform single-circuit line three-phase short-circuit fault tripping simulation on the actual power grid simulation system by using the electromechanical transient simulation model, to obtain a fifth simulation sub-result, wherein the single-circuit line three-phase short-circuit fault tripping simulation belongs to electromechanical transient simulation; a sixth obtaining module, configured to perform DC system single-machine blocking fault simulation on the actual power grid simulation system by using the electromechanical transient simulation model, to obtain a sixth simulation sub-result, wherein the DC system single-machine blocking fault simulation belongs to electromechanical transient simulation; and a seventh obtaining module, configured to perform wind farm repeated low-voltage ride-through fault simulation on the actual power grid simulation system by using the electromechanical transient simulation model, to obtain a seventh simulation sub-result, wherein the wind farm repeated low-voltage ride-through fault simulation belongs to electromechanical transient simulation.

[0083] Optionally, the fourth obtaining unit comprises: an eighth obtaining module, configured to determine, according to the first simulation result and the second simulation result, an electrical quantity whose deviation exceeds a corresponding deviation threshold as an abnormal electrical quantity, and obtain an abnormal quantity of all abnormal electrical quantities; a ninth obtaining module, configured to compare the abnormal quantity with a predetermined quantity, to obtain a comparison result; a generating module, configured to generate a checking strategy for checking the electromechanical transient simulation model according to the comparison result; and a tenth obtaining module, configured to check the electromechanical transient simulation model according to the checking strategy, to obtain a checking result.

[0084] Optionally, the generating module comprises: a first determining submodule, configured to determine, when the comparison result indicates that the number of exceptions is not greater than the predetermined number, that the checking strategy is to check the model parameters of the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model; and a second determining submodule, configured to determine, when the comparison result indicates that the number of exceptions is greater than the predetermined number, that the checking strategy is to check the model parameters of each sub-model in the electromechanical transient simulation model in a predetermined order, wherein the predetermined order is the checking order of each sub-model.

[0085] Optionally, the first determining submodule comprises: a third determining submodule, configured to determine that the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model is a target sub-model; and a first checking submodule, configured to check the model parameters in the target sub-model in sequence.

[0086] Optionally, the third determining submodule comprises: a fourth determining submodule, configured to determine, when the abnormal electrical quantity is voltage, that the wind turbine motor and converter primary system model, the wind power model and the wind turbine shaft system model in the electromechanical transient simulation model are target sub-models; a fifth determining submodule, configured to determine, when the abnormal electrical quantity is voltage, that the active power control model in a normal state, the active power control model during and after voltage ride-through, the reactive power control model in a normal state, and the reactive power control model during and after voltage ride-through in the electromechanical transient simulation model are target sub-models; a sixth determining submodule, configured to determine, when the abnormal electrical quantity is voltage, that the active power control model in a normal state, the active power control model during and after voltage ride-through, and the voltage ride-through state judgment model in the electromechanical transient simulation model are target sub-models; a seventh determining submodule, configured to determine, when the abnormal electrical quantity is voltage, that the reactive power control model in a normal state, the reactive power control model during and after voltage ride-through, and the voltage ride-through state judgment model in the electromechanical transient simulation model are target sub-models; and an eighth determining submodule, configured to determine, when the abnormal electrical quantity is voltage, that the frequency control model in the electromechanical transient simulation model is a target sub-model.

[0087] Optionally, the correction device of the electromechanical transient simulation model of the wind farm further comprises a second checking submodule, configured to preferentially check the sub-models containing priority model parameters, wherein the priority model parameters at least comprise dead zone parameters, clipping parameters and proportional-integral-derivative controller (PID) parameters.

[0088] According to another aspect of the embodiments of the present application, a correction system of an electromechanical transient simulation model of a wind farm is also provided, which uses any of the above-mentioned correction methods of the electromechanical transient simulation model of the wind farm.

[0089] According to another aspect of the embodiments of the present application, there is also provided a computer readable storage medium comprising a stored program, wherein the program performs any of the above-mentioned wind farm electromechanical transient simulation model correction methods.

[0090] Optionally, in the embodiment, the computer readable storage medium can be located in any one of the computer terminals in the computer terminal group in the computer network, or in any one of the communication devices in the communication device group.

[0091] Optionally, in the embodiment, the computer readable storage medium is configured to store program codes for performing the following steps: obtaining an electromechanical transient simulation model to be checked, wherein the electromechanical transient simulation model is used to simulate and analyze dynamic response and transient behavior of a generator set of a wind farm during operation; constructing a single-machine system of the wind farm to perform electromechanical transient simulation on the single-machine system by using the electromechanical transient simulation model to obtain a first simulation result, wherein the single-machine system refers to the wind farm as an independent power system unit in simulation; connecting the wind farm to an actual power grid simulation system to perform electromechanical transient simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a second simulation result, wherein the actual power grid simulation system refers to the wind farm as a component connected to a real power grid model in simulation; checking the electromechanical transient simulation model to obtain a checking result when there is at least one electrical quantity deviation exceeding a corresponding deviation threshold value between the first simulation result and the second simulation result, wherein the electrical quantity deviation refers to a deviation between a simulation output value of an electrical quantity of the wind farm and a corresponding electrical quantity threshold value, the electrical quantity is used to evaluate the accuracy of the electromechanical transient simulation model, each electrical quantity corresponds to an electrical quantity threshold value, and each electrical quantity deviation corresponds to a deviation threshold value; correcting the electromechanical transient simulation model according to the checking result to obtain a corrected electromechanical transient simulation model, so that a third simulation result of the corrected electromechanical transient simulation model in stability simulation of the wind farm is less than the deviation threshold value from an actual operation result of the wind farm.

[0092] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following steps: constructing a single-machine infinite system and a single-machine load system of the wind farm, wherein the single-machine infinite system and the single-machine load system both belong to single-machine systems; performing fault-free simulation on the single-machine infinite system by using the electromechanical transient simulation model to obtain a first simulation sub-result, wherein the fault-free simulation belongs to electromechanical transient simulation; performing instantaneous short-circuit fault simulation on the single-machine infinite system by using the electromechanical transient simulation model to obtain a second simulation sub-result, wherein the instantaneous short-circuit fault simulation belongs to electromechanical transient simulation; performing instantaneous short-circuit fault simulation on the single-machine load system by using the electromechanical transient simulation model to obtain a third simulation sub-result; performing load-shedding small disturbance fault simulation on the single-machine load system by using the electromechanical transient simulation model to obtain a fourth simulation sub-result, wherein the load-shedding small disturbance fault simulation belongs to electromechanical transient simulation.

[0093] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following steps: connecting the wind farm to an actual power grid simulation system; performing single-circuit line three-phase short-circuit fault tripping simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a fifth simulation sub-result, wherein the single-circuit line three-phase short-circuit fault tripping simulation belongs to electromechanical transient simulation; performing DC system single-machine blocking fault simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a sixth simulation sub-result, wherein the DC system single-machine blocking fault simulation belongs to electromechanical transient simulation; performing wind farm repeated low-voltage ride-through fault simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a seventh simulation sub-result, wherein the wind farm repeated low-voltage ride-through fault simulation belongs to electromechanical transient simulation.

[0094] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following steps: determining, according to the first simulation result and the second simulation result, an electrical quantity whose deviation exceeds a corresponding deviation threshold as an abnormal electrical quantity, and obtaining an abnormal number of all abnormal electrical quantities; comparing the abnormal number with a predetermined number to obtain a comparison result; generating a checking strategy for checking the electromechanical transient simulation model according to the comparison result; and checking the electromechanical transient simulation model according to the checking strategy to obtain a checking result.

[0095] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following steps: determining the checking strategy as checking the model parameters of the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model, in the case that the comparison result indicates that the number of abnormalities is not greater than the predetermined number; and determining the checking strategy as checking the model parameters of each sub-model in the electromechanical transient simulation model in a predetermined order, in the case that the comparison result indicates that the number of abnormalities is greater than the predetermined number, wherein the predetermined order is the checking order of each sub-model.

[0096] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following steps: determining the checking strategy as checking the model parameters of the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model, in the case that the comparison result indicates that the number of abnormalities is not greater than the predetermined number; and determining the checking strategy as checking the model parameters of each sub-model in the electromechanical transient simulation model in a predetermined order, in the case that the comparison result indicates that the number of abnormalities is greater than the predetermined number, wherein the predetermined order is the checking order of each sub-model.

[0097] Optionally, the determining the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model as the target sub-model comprises: determining the wind turbine generator motor and converter primary system model, the wind power model and the wind turbine shaft system model in the electromechanical transient simulation model as the target sub-model, in the case that the abnormal electrical quantity is voltage; determining the active power control model in normal state, the active power control model during and after voltage ride-through, the reactive power control model in normal state, the reactive power control model during and after voltage ride-through in the electromechanical transient simulation model as the target sub-model, in the case that the abnormal electrical quantity is voltage; determining the active power control model in normal state, the active power control model during and after voltage ride-through and the voltage ride-through state judgment model in the electromechanical transient simulation model as the target sub-model, in the case that the abnormal electrical quantity is voltage; determining the reactive power control model in normal state, the reactive power control model during and after voltage ride-through and the voltage ride-through state judgment model in the electromechanical transient simulation model as the target sub-model, in the case that the abnormal electrical quantity is voltage; and determining the frequency control model in the electromechanical transient simulation model as the target sub-model, in the case that the abnormal electrical quantity is voltage.

[0098] Optionally, the correction method of the electromechanical transient simulation model of the wind farm further comprises: preferentially checking the sub-models containing priority model parameters, wherein the priority model parameters at least include dead zone parameters, clipping parameters and proportional-integral-derivative controller (PID) parameters.

[0099] According to another aspect of the embodiments of the present application, a processor is also provided, which is configured to run a program, wherein the program, when running, performs any of the above-mentioned correction methods of the electromechanical transient simulation model of the wind farm.

[0100] According to another aspect of the embodiments of the present application, there is also provided a computer program product comprising computer instructions which, when executed by a processor, perform any of the above-mentioned methods for correcting a wind farm electromechanical transient simulation model.

[0101] The above-mentioned sequence numbers of the embodiments of the present application are only for description, and do not represent advantages or disadvantages of the embodiments.

[0102] In the above-mentioned embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0103] In several embodiments provided in the present application, it should be understood that the disclosed technical contents can be implemented by other manners. Among them, the above-mentioned device embodiments are only schematic, for example, the division of the units can be a logical function division, and in actual implementation, there can be another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or modules shown or discussed can be indirect coupling or communication connection through some interfaces, units or modules, which can be electrical or other forms.

[0104] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed to multiple units. According to actual needs, part or all of the units can be selected to achieve the purpose of the present embodiment scheme.

[0105] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0106] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, essentially or in other words, the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to make a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present application. The aforementioned storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0107] The above is only the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method for correcting a wind farm electromechanical transient simulation model, characterized in that, include: Obtain the electromechanical transient simulation model that needs to be verified, wherein the electromechanical transient simulation model is used to simulate and analyze the dynamic response and transient behavior of the generator set of the wind farm during operation; A single-unit system of the wind farm is constructed, and the electromechanical transient simulation model is used to perform electromechanical transient simulation on the single-unit system to obtain a first simulation result. The single-unit system refers to the wind farm as an independent power system unit in the simulation. The wind farm is connected to the actual power grid simulation system, and the electromechanical transient simulation model is used to perform electromechanical transient simulation on the actual power grid simulation system to obtain a second simulation result. The actual power grid simulation system refers to the system in which the wind farm is connected as a component to a real power grid model in the simulation. If at least one electrical quantity deviation exceeds the corresponding deviation threshold in the first simulation result and the second simulation result, the electromechanical transient simulation model is checked to obtain a check result, including: determining the electrical quantity whose electrical quantity deviation exceeds the corresponding deviation threshold as an abnormal electrical quantity based on the first simulation result and the second simulation result, and obtaining the abnormal number of all the abnormal electrical quantities; comparing the abnormal number with a predetermined number to obtain a comparison result; If the comparison result indicates that the number of anomalies is not greater than the predetermined number, the verification strategy is determined as follows: the model parameters of the sub-models corresponding to the abnormal electrical quantities in the electromechanical transient simulation model are verified. If the comparison result indicates that the number of anomalies is greater than the predetermined number, the verification strategy is determined to be: to verify the model parameters of each sub-model in the electromechanical transient simulation model in a predetermined order, wherein the predetermined order is the verification order of each sub-model; The electromechanical transient simulation model is verified according to the verification strategy to obtain the verification result; wherein, the electrical quantity deviation refers to the deviation between the simulation output value of the electrical quantity of the wind farm and the corresponding electrical quantity threshold. The electrical quantity is used to evaluate the accuracy of the electromechanical transient simulation model. Each electrical quantity corresponds to an electrical quantity threshold, and each electrical quantity deviation corresponds to a deviation threshold. The electromechanical transient simulation model is corrected based on the verification results to obtain the corrected electromechanical transient simulation model, so that the deviation between the third simulation result of the corrected electromechanical transient simulation model for the stability simulation of the wind farm and the actual operation result of the wind farm is less than the deviation threshold.

2. The correction method for the electromechanical transient simulation model of a wind farm according to claim 1, characterized in that, Construct a single-unit system for the wind farm, and perform electromechanical transient simulation on the single-unit system using the electromechanical transient simulation model to obtain a first simulation result, including: Construct a single-unit infinite bus system and a single-unit load system for the wind farm, wherein both the single-unit infinite bus system and the single-unit load system belong to the single-unit system; The single-machine infinite bus system is simulated without faults using the electromechanical transient simulation model to obtain the first simulation sub-result, wherein the fault-free simulation belongs to the electromechanical transient simulation. The instantaneous short-circuit fault simulation of the single-machine infinite bus system is performed using the electromechanical transient simulation model to obtain a second simulation sub-result, wherein the instantaneous short-circuit fault simulation belongs to the electromechanical transient simulation. The electromechanical transient simulation model was used to simulate the instantaneous short-circuit fault of the single-machine loaded system, and the third simulation sub-result was obtained; The electromechanical transient simulation model is used to simulate the single-machine loaded system under load shedding with small disturbance faults, and a fourth simulation sub-result is obtained. The load shedding with small disturbance fault simulation belongs to the electromechanical transient simulation.

3. The correction method for the electromechanical transient simulation model of a wind farm according to claim 1, characterized in that, The wind farm is connected to the actual power grid simulation system, and the electromechanical transient simulation model is used to perform electromechanical transient simulation on the actual power grid simulation system to obtain a second simulation result, including: Connect the wind farm to the actual power grid simulation system; The electromechanical transient simulation model is used to simulate the tripping of a three-phase short-circuit fault on a single circuit line in the actual power grid simulation system, and the fifth simulation sub-result is obtained. The tripping of a three-phase short-circuit fault on a single circuit line belongs to the electromechanical transient simulation. The electromechanical transient simulation model is used to simulate the DC system single-machine blocking fault of the actual power grid simulation system, and the sixth simulation sub-result is obtained. The DC system single-machine blocking fault simulation belongs to the electromechanical transient simulation. The electromechanical transient simulation model was used to simulate the repeated low-voltage ride-through faults of the wind farm in the actual power grid simulation system, and the seventh simulation sub-result was obtained. The simulation of the repeated low-voltage ride-through faults of the wind farm belongs to the electromechanical transient simulation.

4. The correction method for the electromechanical transient simulation model of a wind farm according to claim 1, characterized in that, The model parameters of the sub-models corresponding to the abnormal electrical quantities in the electromechanical transient simulation model are checked, including: The sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model is identified as the target sub-model. The model parameters in the target sub-model are checked sequentially.

5. The correction method for the electromechanical transient simulation model of a wind farm according to claim 4, characterized in that, Determining the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model as the target sub-model includes: When the abnormal electrical quantity is voltage, the wind turbine generator and converter primary system model, wind power model and wind turbine shaft system model in the electromechanical transient simulation model are determined as the target sub-model; When the abnormal electrical quantity is voltage, the active power control model under normal state, the active power control model during and after voltage ride-through, the reactive power control model under normal state, and the reactive power control model during and after voltage ride-through in the electromechanical transient simulation model are determined as the target sub-model. When the abnormal electrical quantity is voltage, the active power control model under normal state, the active power control model during and after voltage ride-through, and the voltage ride-through state judgment model in the electromechanical transient simulation model are determined as the target sub-models. When the abnormal electrical quantity is voltage, the reactive power control model under normal state, the reactive power control model during and after voltage ride-through, and the voltage ride-through state judgment model in the electromechanical transient simulation model are determined as the target sub-model. When the abnormal electrical quantity is voltage, the frequency control model in the electromechanical transient simulation model is determined as the target sub-model.

6. The correction method for the electromechanical transient simulation model of a wind farm according to claim 1, characterized in that, Also includes: The sub-model containing the priority model parameters is calibrated first, wherein the priority model parameters include at least: dead zone parameters, amplitude limiting parameters, and proportional-integral-derivative (PID) controller parameters.

7. A calibration device for a wind farm electromechanical transient simulation model, characterized in that, The apparatus for performing the correction method for the electromechanical transient simulation model of a wind farm according to any one of claims 1 to 6 includes: The first acquisition unit is used to acquire the electromechanical transient simulation model that needs to be verified, wherein the electromechanical transient simulation model is used to simulate and analyze the dynamic response and transient behavior of the generator set of the wind farm during operation; The second acquisition unit is used to construct the single-unit system of the wind farm, and to perform electromechanical transient simulation on the single-unit system using the electromechanical transient simulation model to obtain the first simulation result. The single-unit system refers to the wind farm as an independent power system unit in the simulation. The third acquisition unit is used to connect the wind farm to the actual power grid simulation system, so as to use the electromechanical transient simulation model to perform electromechanical transient simulation on the actual power grid simulation system and obtain the second simulation result. The actual power grid simulation system refers to connecting the wind farm as a component to a real power grid model in the simulation. The fourth acquisition unit is used to verify the electromechanical transient simulation model and obtain a verification result when at least one electrical quantity deviation in the first simulation result and the second simulation result exceeds the corresponding deviation threshold. The electrical quantity deviation refers to the deviation between the simulation output value of the electrical quantity of the wind farm and the corresponding electrical quantity threshold. The electrical quantity is used to evaluate the accuracy of the electromechanical transient simulation model. Each electrical quantity corresponds to an electrical quantity threshold, and each electrical quantity deviation corresponds to a deviation threshold. The fifth acquisition unit is used to correct the electromechanical transient simulation model according to the verification result to obtain the corrected electromechanical transient simulation model, so that the deviation between the third simulation result of the corrected electromechanical transient simulation model for the stability simulation of the wind farm and the actual operation result of the wind farm is less than the deviation threshold.

8. A computer program product comprising computer instructions, characterized in that, When the computer instructions are executed by the processor, the correction method for the electromechanical transient simulation model of the wind farm as described in any one of claims 1 to 6 is executed.

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