Method and device for correcting electromechanical transient simulation model of wind power plant

Abstract

The invention discloses a correction method and device for an electromechanical transient simulation model of a wind power plant. The method comprises the steps that an electromechanical transient simulation model needing to be checked is acquired; performing electromechanical transient simulation on the stand-alone system by using the electromechanical transient simulation model to obtain a first simulation result; performing electromechanical transient simulation on the actual power grid simulation system by using the electromechanical transient simulation model to obtain a second simulation result; under the condition that at least one electrical quantity deviation in the first simulation result and the second simulation result exceeds a corresponding deviation threshold value, checking the electromechanical transient simulation model to obtain a checking result; and correcting the electromechanical transient simulation model according to a checking result to obtain a corrected electromechanical transient simulation model. According to the invention, the technical problem of large deviation between the simulation result and the actual operation condition of the power system due to the inaccurate electromechanical transient simulation calculation model of the wind power plant in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power systems, and in particular to a correction method and device for a wind farm electromechanical transient simulation model. Background Art

[0002] The simulation calculation of power system safety and stability is an important means to arrange the operation mode of power system. The accuracy of the electromechanical transient simulation calculation model of the wind farm has an important impact on the results of the simulation calculation of power system safety and stability. If the electromechanical transient simulation calculation model of the wind farm is inaccurate, it is easy to cause a large deviation between the simulation results of power system safety and stability and the actual operation of the power system, which will lead to the arrangement of power system operation mode not meeting the actual needs of the power system, and in serious cases, it will threaten the safe and stable operation of the power system.

[0003] With regard to the problem in the above-mentioned related technologies that the electromechanical transient simulation calculation model of the wind farm is inaccurate, resulting in a large deviation between the simulation results and the actual operation of the power system, no effective solution has been proposed so far. Summary of the invention

[0004] The embodiments of the present invention provide a method and device for calibrating a wind farm electromechanical transient simulation model, so as to at least solve the technical problem in the related art that the electromechanical transient simulation calculation model of the wind farm is inaccurate, resulting in a large deviation between the simulation result and the actual operation of the power system.

[0005] According to one aspect of an embodiment of the present invention, there is provided a method for calibrating an electromechanical transient simulation model of a wind farm, comprising: obtaining an electromechanical transient simulation model to be calibrated, 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; constructing a single-machine system of the wind farm, so as to perform electromechanical transient simulation on the single-machine system using the electromechanical transient simulation model, and obtain a first simulation result, wherein the single-machine system refers to treating the wind farm as an independent power system unit in the simulation; connecting the wind farm to an actual power grid simulation system, so as to perform electromechanical transient simulation on the actual power grid simulation system using the electromechanical transient simulation model, and obtain a second simulation result, wherein the actual power grid simulation system refers to connecting the wind farm as a component to a a real power grid model; in the case that 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 calibrated to obtain a calibration result, wherein 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 of the electrical quantity corresponds to an electrical quantity threshold, and each of the electrical quantity deviation corresponds to a deviation threshold; the electromechanical transient simulation model is calibrated according to the calibration result to obtain the calibrated electromechanical transient simulation model, so that the deviation between the third simulation result of the stability simulation of the wind farm by the calibrated electromechanical transient simulation model and the actual operation result of the wind farm is less than the deviation threshold.

[0006] Optionally, a single-machine system of the wind farm is constructed to perform electromechanical transient simulation on the single-machine system using the electromechanical transient simulation model to obtain a first simulation result, including: 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 the single-machine system; performing a fault-free simulation on the single-machine infinite 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 an instantaneous short-circuit fault simulation on the single-machine infinite system 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; performing an instantaneous short-circuit fault simulation on the single-machine load system using the electromechanical transient simulation model to obtain a third simulation sub-result; performing a load shedding small disturbance fault simulation on the single-machine load 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.

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

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

[0009] Optionally, a calibration strategy for calibrating the electromechanical transient simulation model is generated based on the comparison result, including: when the comparison result indicates that the number of abnormalities is not greater than the predetermined number, determining the calibration strategy as: calibrating the model parameters of the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model; when the comparison result indicates that the number of abnormalities is greater than the predetermined number, determining the calibration strategy as: calibrating the model parameters of each sub-model in the electromechanical transient simulation model in a predetermined order, wherein the predetermined order is the calibration order of each sub-model.

[0010] Optionally, the model parameters of the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model are checked, including: determining that the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model is a target sub-model; and checking the model parameters in the target sub-model in turn.

[0011] Optionally, 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, determining the wind turbine 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; when the abnormal electrical quantity is voltage, determining the active control model under normal conditions, the active control model during and after voltage crossing, the reactive control model under normal conditions, and the reactive control model during and after voltage crossing in the electromechanical transient simulation model as the target sub-model. ; When the abnormal electrical quantity is voltage, the active power control model in the normal state, the active power control model during and after the voltage crossing, and the voltage crossing state judgment model in the electromechanical transient simulation model are determined as the target sub-model; when the abnormal electrical quantity is voltage, the reactive power control model in the normal state, the reactive power control model during and after the voltage crossing, and the voltage crossing 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.

[0012] Optionally, the correction method of the wind farm electromechanical transient simulation model also includes: preferentially checking the sub-model containing priority model parameters, wherein the priority model parameters at least include: dead zone parameters, limit parameters, proportional-integral-differential controller PID parameters.

[0013] According to another aspect of an embodiment of the present invention, a correction device for an electromechanical transient simulation model of a wind farm is also provided, comprising: a first acquisition unit, used to acquire an electromechanical transient simulation model that needs to be calibrated, 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 second acquisition unit, used to construct a single-machine system of the wind farm, so as to perform electromechanical transient simulation on the single-machine system using the electromechanical transient simulation model, and obtain a first simulation result, wherein the single-machine system refers to treating the wind farm as an independent power system unit in the simulation; a third acquisition unit, used 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 using the electromechanical transient simulation model, and obtain a second simulation result, wherein the actual power grid simulation system refers to treating the wind farm as a component in the simulation. The first and second simulation results are respectively connected to a real power grid model; a fourth acquisition unit is used to calibrate the electromechanical transient simulation model to obtain a calibration result when there is at least one electrical quantity deviation exceeding the corresponding deviation threshold in the first simulation result and the second simulation result, wherein 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 of the electrical quantity corresponds to an electrical quantity threshold, and each of the electrical quantity deviation corresponds to a deviation threshold; a fifth acquisition unit is used to calibrate the electromechanical transient simulation model according to the calibration result to obtain the calibrated electromechanical transient simulation model, so that the deviation between the third simulation result of the stability simulation of the wind farm by the calibrated electromechanical transient simulation model and the actual operation result of the wind farm is less than the deviation threshold.

[0014] Optionally, the second acquisition unit includes: a construction module, which is used 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 acquisition module, which is used to use the electromechanical transient simulation model to perform a fault-free simulation on the single-machine infinite system to obtain a first simulation sub-result, wherein the fault-free simulation belongs to the electromechanical transient simulation; a second acquisition module, which is used to use the electromechanical transient simulation model to perform an instantaneous short-circuit fault simulation on the single-machine infinite system to obtain a second simulation sub-result, wherein the instantaneous short-circuit fault simulation belongs to the electromechanical transient simulation; a third acquisition module, which is used to use the electromechanical transient simulation model to perform an instantaneous short-circuit fault simulation on the single-machine load system to obtain a third simulation sub-result; a fourth acquisition module, which is used to use the electromechanical transient simulation model to perform a load shedding small disturbance fault simulation on the single-machine load system 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 acquisition unit includes: an access module for connecting the wind farm to the actual power grid simulation system; a fifth acquisition module for using the electromechanical transient simulation model to perform a single-circuit line three-phase short-circuit fault tripping simulation on the actual power grid simulation system 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 acquisition module for using the electromechanical transient simulation model to perform a DC system single-machine lockout fault simulation on the actual power grid simulation system to obtain a sixth simulation sub-result, wherein the DC system single-machine lockout fault simulation belongs to the electromechanical transient simulation; a seventh acquisition module for using the electromechanical transient simulation model to perform a wind farm repeatedly entering and exiting low voltage ride-through fault simulation on the actual power grid simulation system to obtain a seventh simulation sub-result, wherein the wind farm repeatedly entering and exiting low voltage ride-through fault simulation belongs to the electromechanical transient simulation.

[0016] Optionally, the fourth acquisition unit includes: an eighth acquisition module, used to determine, based on the first simulation result and the second simulation result, that the electrical quantity whose electrical quantity deviation exceeds the corresponding deviation threshold is an abnormal electrical quantity, and obtain the abnormal number of all the abnormal electrical quantities; a ninth acquisition module, used to compare the abnormal number with a predetermined number to obtain a comparison result; a generation module, used to generate a calibration strategy for calibrating the electromechanical transient simulation model based on the comparison result; and a tenth acquisition module, used to calibrate the electromechanical transient simulation model according to the calibration strategy to obtain the calibration result.

[0017] Optionally, the generation module includes: a first determination submodule, used to determine the verification strategy as: verifying the model parameters of the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model when the comparison result indicates that the number of abnormalities is not greater than the predetermined number; and a second determination submodule, used to determine the verification strategy as: verifying the model parameters of each sub-model in the electromechanical transient simulation model in a predetermined order when the comparison result indicates that the number of abnormalities is greater than the predetermined number, wherein the predetermined order is the verification order of each sub-model.

[0018] Optionally, the first determination submodule includes: a third determination submodule, used to determine that the submodel corresponding to the abnormal electrical quantity in the electromechanical transient simulation model is the target submodel; and a first verification submodule, used to verify the model parameters in the target submodel in turn.

[0019] Optionally, the third determination submodule includes: a fourth determination submodule, which is used to determine, when the abnormal electrical quantity is voltage, 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 as the target submodel; a fifth determination submodule, which is used to determine, when the abnormal electrical quantity is voltage, the active control model in the normal state, the active control model during and after the voltage crossing, the reactive control model in the normal state, and the reactive control model during and after the voltage crossing in the electromechanical transient simulation model as the target submodel; a sixth determination submodule, which is used to determine, when the abnormal electrical quantity is voltage, the active control model in the normal state, the active control model during and after the voltage crossing in the electromechanical transient simulation model as the target submodel. When the abnormal electrical quantity is voltage, the active power control model in the normal state, the active power control model during and after the voltage crossing, and the voltage crossing state judgment model in the electromechanical transient simulation model are determined as the target sub-model; the seventh determination sub-module is used to determine, when the abnormal electrical quantity is voltage, the reactive power control model in the normal state, the reactive power control model during and after the voltage crossing, and the voltage crossing state judgment model in the electromechanical transient simulation model as the target sub-model; the eighth determination sub-module is used to determine, when the abnormal electrical quantity is voltage, the frequency control model in the electromechanical transient simulation model as the target sub-model.

[0020] Optionally, the correction device of the wind farm electromechanical transient simulation model also includes: a second verification submodule, used to preferentially calibrate the submodel containing priority model parameters, wherein the priority model parameters include at least: dead zone parameters, limit parameters, proportional-integral-differential controller PID parameters.

[0021] According to another aspect of an embodiment of the present invention, a correction system for a wind farm electromechanical transient simulation model is provided. The correction system for a wind farm electromechanical transient simulation model uses any of the above-mentioned correction methods for a wind farm electromechanical transient simulation model.

[0022] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is further provided, the computer-readable storage medium comprising a stored program, wherein the program executes any one of the above-mentioned methods for calibrating a wind farm electromechanical transient simulation model.

[0023] According to another aspect of an embodiment of the present invention, a processor is further provided, the processor being used to run a program, wherein the program, when running, executes any one of the above-mentioned methods for calibrating a wind farm electromechanical transient simulation model.

[0024] According to another aspect of an embodiment of the present invention, a computer program product is provided, comprising computer instructions, which, when executed by a processor, perform any one of the above-mentioned methods for calibrating a wind farm electromechanical transient simulation model.

[0025] In an embodiment of the present invention, an electromechanical transient simulation model that needs to be verified is obtained, 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, and the electromechanical transient simulation model is used to perform electromechanical transient simulation on the single-machine system to obtain a first simulation result, wherein the single-machine system refers to treating 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, wherein the actual power grid simulation system refers to connecting the wind farm as a component to a real power grid model in the simulation; When there is at least one electrical quantity deviation in the first simulation result and the second simulation result that exceeds the corresponding deviation threshold, the electromechanical transient simulation model is calibrated to obtain a calibration 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 calibrated according to the calibration result to obtain a calibrated electromechanical transient simulation model, so that the deviation between the third simulation result of the stability simulation of the wind farm by the calibrated electromechanical transient simulation model and the actual operation result of the wind farm is less than the deviation threshold. Through the above technical scheme, it is achieved that the wind farm is simulated using the electromechanical transient simulation model in a variety of simulation scenarios, and the problematic parts of the electromechanical transient simulation model are determined based on the simulation results for the purpose of verifying and correcting them. The technical effect of reducing the deviation between the simulation results and the actual operation of the power system by correcting the electromechanical transient simulation model is achieved, and the accuracy of the electromechanical transient simulation model is improved, thereby solving the technical problem in the related technology that the simulation results have a large deviation from the actual operation of the power system due to the inaccurate electromechanical transient simulation calculation model of the wind farm. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 It is a hardware structure block diagram of a mobile terminal of a method for calibrating a wind farm electromechanical transient simulation model according to an embodiment of the present invention;

[0028] Figure 2 is a flow chart of a method for calibrating a wind farm electromechanical transient simulation model according to an embodiment of the present invention;

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

[0030] Figure 4 Schematic diagram of a correction device for a wind farm electromechanical transient simulation model according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

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

[0033] As introduced in the background technology, in the related art, due to the inaccurate electromechanical transient simulation calculation model of the wind farm, the simulation results deviate greatly from the actual operation of the power system. In view of the above defects, a method and device for calibrating the electromechanical transient simulation model of a wind farm is provided in an embodiment of the present invention.

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] The method embodiments provided in the embodiments of the present invention can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 1 is a hardware structure block diagram of a mobile terminal of a method for calibrating a wind farm electromechanical transient simulation model according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0036] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the correction method of the electromechanical transient simulation model of the wind farm in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above method is implemented. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal through a network. Examples of the above 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 example of the above network may 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, referred to as 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 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0037] According to an embodiment of the present invention, a method embodiment of a method for correcting a 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 set of computer executable instructions, and although a 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 flow chart of a method for calibrating a wind farm electromechanical transient simulation model according to an embodiment of the present invention. Figure 2 As shown, the method comprises the following steps:

[0039] Step S202: obtaining an electromechanical transient simulation model that needs to be calibrated, wherein the electromechanical transient simulation model is used to simulate and analyze the dynamic response and transient behavior of the generator sets of the wind farm during operation.

[0040] In this embodiment, the electromechanical transient simulation model that needs to be calibrated can be first obtained, and the model mainly includes: a primary system model of a wind turbine motor and converter, a wind power model, a wind turbine shaft system model, an active power control model under normal conditions, a reactive power control model under normal conditions, an active and reactive current limiting model, a voltage crossing state judgment model, an active power control model during and after voltage crossing, a reactive power control model during and after voltage crossing, a low voltage crossing protection model, a 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, constructing a single-machine system of the wind farm, and performing electromechanical transient simulation on the single-machine system using an 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 the simulation.

[0042] Combine the following Figure 3 The above embodiments of the present invention are described in detail. Figure 3 is a flow chart of an optional method for correcting a wind farm electromechanical transient simulation model according to an embodiment of the present invention, such as Figure 3 As shown, the electromechanical transient simulation model can be used to perform simulation based on a single-machine system, so as to verify the electromechanical transient simulation model according to the simulation results.

[0043] According to the above embodiment of the present invention, in the above step S204, a single-machine system of a wind farm is constructed, and an electromechanical transient simulation model is used to perform electromechanical transient simulation on the single-machine system to obtain a first simulation result, including: 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 the single-machine system; using the electromechanical transient simulation model to perform a fault-free simulation on the single-machine infinite system to obtain a first simulation sub-result, wherein the fault-free simulation belongs to the electromechanical transient simulation; using the electromechanical transient simulation model to perform an instantaneous short-circuit fault simulation on the single-machine infinite system to obtain a second simulation sub-result, wherein the instantaneous short-circuit fault simulation belongs to the electromechanical transient simulation; using the electromechanical transient simulation model to perform an instantaneous short-circuit fault simulation on the single-machine load system to obtain a third simulation sub-result; using the electromechanical transient simulation model to perform a load shedding small interference fault simulation on the single-machine load system to obtain a fourth simulation sub-result, wherein the load shedding small interference 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 a wind farm can be constructed, and then the electromechanical transient simulation model can be used to perform fault-free simulation and instantaneous circuit breaker fault simulation on the single-machine infinite system, and to perform instantaneous short-circuit fault simulation and load shedding small interference fault simulation on the single-machine load system, so as to calibrate the electromechanical transient simulation model according to the simulation results.

[0045] Specifically, to construct a single-machine infinite system of a wind farm, the initial operating conditions of the wind farm can be set to voltage equal to its rated voltage, active power equal to its rated active power, reactive power equal to 0, and frequency equal to 50Hz; then, when performing a fault-free simulation on the single-machine infinite system, the simulation time can be set to 20 seconds, and the simulation result output curves of electrical quantities such as voltage, current, active power, reactive power, and frequency of the wind farm can be obtained through simulation; when performing an instantaneous short-circuit fault simulation on the single-machine infinite system, the short-circuit fault point can be selected at the wind farm outlet bus, the short-circuit time can be set to 0.02 seconds, and the simulation time can be set to 20 seconds, and the simulation result output curves of electrical quantities such as voltage, current, active power, reactive power, and frequency of the wind farm can be obtained through simulation. To construct a single-machine load system of a wind farm, the initial operating conditions of the wind farm can be set to voltage equal to its rated voltage, active power equal to its rated active power, reactive power equal to 0, and frequency equal to 50Hz; then, when simulating an instantaneous short-circuit fault on the single-machine load system, the short-circuit fault point can be selected at the wind farm outlet bus, the short-circuit time can be set to 0.02 seconds, and the simulation duration can be set to 20 seconds. Through simulation, the simulation result output curves of electrical quantities such as voltage, current, active power, reactive power, and frequency of the wind farm can be obtained; when simulating a small interference fault with load shedding on the single-machine load system, the load shedding amount can be set not to exceed 5% of the total load, and the simulation duration can be set to 40 seconds. Through simulation, the simulation result output curves of electrical quantities such as voltage, current, active power, reactive power, and frequency of the wind farm can be obtained.

[0046] Step S206, connecting the wind farm to the actual power grid simulation system, and using the electromechanical transient simulation model 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 connecting the wind farm as a component to a real power grid model in the simulation.

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

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

[0049] As above Figure 3 As shown, the wind farm can be connected to the actual power grid simulation system, and then the electromechanical transient simulation model can be used to simulate the tripping of a single-loop three-phase short-circuit fault, the DC system single-machine locking fault, and the wind farm repeatedly entering and exiting low voltage ride-through faults on the actual power grid simulation system, so as to calibrate the electromechanical transient simulation model according to the simulation results.

[0050] Specifically, when the wind farm is connected to the actual power grid simulation system, the location of the access to the power grid is set according to the actual access location of the wind farm. The initial operating conditions of the wind farm can be set as voltage equal to its rated voltage, active power equal to its rated active power, reactive power equal to 0, and frequency equal to 50Hz; then, when the electromechanical transient simulation model is used to simulate the tripping of a single-loop three-phase short-circuit fault in the actual power grid simulation system, the line can select a certain line near the location of the wind farm, and the three-phase short-circuit fault point can select a certain end of the line. The short-circuit time can be set to 0.1 seconds, and the simulation duration can be set to 20 seconds. The simulation results of electrical quantities such as voltage, current, active power, reactive power, and frequency of the wind farm are output through simulation. line; when simulating a single-machine locking fault of a DC system for an actual power grid simulation system, a DC can be selected in the vicinity of a wind farm, and the simulation time can be set to 40 seconds. Through the simulation, the simulation result output curves of the voltage, current, active power, reactive power, frequency and other electrical quantities of the wind farm can be obtained; when simulating a low voltage ride-through fault of a wind farm repeatedly entering and exiting the actual power grid simulation system, the bus voltage at the wind farm outlet can be adjusted to about 92% of the rated voltage, and a load can be repeatedly added and withdrawn in the vicinity of the wind farm to enable the wind farm to enter the low voltage ride-through state. The simulation time can be set to 60 seconds, and the simulation result output curves of the voltage, current, active power, reactive power, frequency and other electrical quantities of the wind farm can be obtained through simulation.

[0051] Here, after using the electromechanical transient simulation model to perform electromechanical transient simulation on a single-machine system, the electromechanical transient simulation is performed on the actual power grid simulation system. This can further identify errors in parameter settings that are too large or too small, which were not identified when the electromechanical transient simulation model was used to perform electromechanical transient simulation on the single-machine system. In particular, errors in parameter settings that are too large or too small in the dead zone, limiting and PID links can be identified, thereby enabling a more comprehensive verification of the electromechanical transient simulation model.

[0052] 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 calibrated to obtain a calibration 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.

[0053] In this embodiment, the electromechanical transient simulation model is used to simulate different systems in various scenarios through the above steps S204 and S206, so that the electromechanical transient simulation model can be calibrated more comprehensively.

[0054] Specifically, each simulation involved in the above steps S204 and S206 will obtain corresponding simulation results, and the simulation results include simulation result output curves of electrical quantities such as voltage, current, active power, reactive power, and frequency of the wind farm. It can be determined whether the electrical quantity is abnormal by analyzing whether the deviation between the simulation output values ​​of these electrical quantities and the corresponding electrical quantity threshold exceeds the deviation threshold. Taking the calculation of the deviation of the voltage simulation result output curve as an example, the calculation formula is: Among them U i is the ith simulation data, U e is the rated voltage (that is, the electrical quantity threshold of the electrical quantity voltage, and the electrical quantity thresholds of other electrical quantities are also its rated values), n is the total number of simulation data, ΔU refers to the voltage deviation, and the calculation methods of the electrical quantity deviations of other electrical quantities are the same as the voltage deviation of voltage, which will not be expanded one by one here. The deviation threshold corresponding to each electrical quantity is 1% of the rated value of the electrical quantity, as follows: the deviation threshold corresponding to the voltage is 1% of the rated voltage, the deviation threshold corresponding to the current is 1% of the rated current, the deviation threshold corresponding to the active power is 1% of the rated active power, the deviation threshold corresponding to the reactive power is 1% of the rated reactive power, and the deviation threshold corresponding to the frequency is 1% of the rated frequency.

[0055] According to the above embodiment of the present invention, in the above 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 calibrated to obtain a calibration result, including: determining, based on the first simulation result and the second simulation result, that the electrical quantity whose electrical quantity deviation exceeds the corresponding deviation threshold is an abnormal electrical quantity, and obtaining the abnormal number of all abnormal electrical quantities; comparing the abnormal number with a predetermined number to obtain a comparison result; generating a calibration strategy for calibrating the electromechanical transient simulation model based on the comparison result; and calibrating the electromechanical transient simulation model according to the calibration strategy to obtain a calibration result.

[0056] In this embodiment, if the electrical quantity deviation of a certain 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; among 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 there is a problem with the electromechanical transient simulation model and calibration is required; next, a corresponding calibration strategy can be generated according to the number of abnormal electrical quantities, and then the electromechanical transient simulation model is calibrated according to the calibration strategy to obtain a calibration result.

[0057] In a specific embodiment of the present invention, a calibration strategy for calibrating an electromechanical transient simulation model is generated based on a comparison result, including: when the comparison result indicates that the number of abnormalities is not greater than a predetermined number, determining the calibration strategy as: calibrating the model parameters of the sub-models corresponding to the abnormal electrical quantities in the electromechanical transient simulation model; when the comparison result indicates that the number of abnormalities is greater than a predetermined number, determining the calibration strategy as: calibrating the model parameters of each sub-model in the electromechanical transient simulation model in a predetermined order, wherein the predetermined order is the calibration order of each sub-model.

[0058] In this embodiment, if there are only 1-2 electrical quantities whose deviation calculation exceeds the threshold (here 2 is taken as an example for the predetermined number for explanation; of course, other numbers can also be selected as the predetermined number based on actual conditions, and there is no specific restriction here), the model parameters of the sub-model corresponding to the abnormal electrical quantities in the electromechanical transient simulation model can be checked in focus; if the electrical quantities whose deviation calculation exceeds the threshold are more than 2, the model parameters of each sub-model in the electromechanical transient simulation model can be checked in sequence.

[0059] When the number of abnormal electrical quantities exceeds 2, the parameters in each sub-model can be checked one by one in the following order (predetermined order): active control model during and after voltage crossing, reactive control model during and after voltage crossing, voltage crossing state judgment model, frequency control model, low voltage crossing protection model, active control model under normal state, reactive control model under normal state, active and reactive current limiting module value, wind turbine motor and converter primary system model, wind power model, wind turbine shaft system model. It should be noted that the predetermined order here can be determined according to actual conditions and is not specifically limited here.

[0060] In the above embodiment of the present invention, 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 the target sub-model; and checking the model parameters in the target sub-model in turn.

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

[0062] Specifically, according to the above embodiment of the present invention, the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model is determined as the target sub-model, including: when the abnormal electrical quantity is voltage, the wind turbine motor 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 in the normal state, the active power control model during and after the voltage crossing, the reactive power control model in the normal state, and the reactive power control model during and after the voltage crossing 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 in the normal state, the active power control model during and after the voltage crossing, and the voltage crossing state judgment model in the electromechanical transient simulation model are determined as the target sub-model; when the abnormal electrical quantity is voltage, the reactive power control model in the normal state, the reactive power control model during and after the voltage crossing, and the voltage crossing state judgment model in the electromechanical transient simulation model are determined as the target sub-model; when the abnormal electrical quantity is voltage, the reactive power control model in the normal state, the reactive power control model during and after the voltage crossing, and the voltage crossing 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.

[0063] Specifically, when the voltage deviation exceeds the corresponding deviation threshold, the wind turbine motor and converter primary system model, wind power model and wind turbine shaft system model in the electromechanical transient simulation model can be determined as target sub-models; when the current deviation exceeds the corresponding deviation threshold, the active control model in the normal state, the active control model during and after the voltage crossing, the reactive control model in the normal state, and the reactive control model during and after the voltage crossing in the electromechanical transient simulation model can be determined as target sub-models; when the active power deviation exceeds the corresponding deviation threshold, the active control model in the normal state, the active control model during and after the voltage crossing, and the voltage crossing state judgment model in the electromechanical transient simulation model can be determined as target sub-models; when the reactive power deviation exceeds the corresponding deviation threshold, the reactive control model in the normal state, the reactive control model during and after the voltage crossing, and the voltage crossing state judgment model in the electromechanical transient simulation model can be determined as target sub-models; 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 invention, the correction method of the wind farm electromechanical transient simulation model also includes: preferentially calibrating the sub-model containing priority model parameters, wherein the priority model parameters at least include: dead zone parameters, limit parameters, proportional-integral-differential controller PID parameters.

[0065] In this embodiment, when calibrating the sub-models that need to be calibrated in the electromechanical transient simulation model, the sub-models including the dead zone parameters, the limiting parameters and the proportional-integral-differential controller PID parameters can be calibrated first; specifically, the dead zone parameters can be increased or decreased, the limiting parameters can be increased or decreased, the proportional link magnification in the PID parameters can be increased or decreased, the differential link magnification in the PID parameters can be increased or decreased, and the integral link magnification in the PID parameters can be increased or decreased one by one to observe the impact of the changes in each parameter on the simulation results. If the modification of one or several of the above parameters will significantly change the simulation results, these problematic parameters can be located.

[0066] Step S210, calibrating the electromechanical transient simulation model according to the verification result to obtain a calibrated electromechanical transient simulation model, so that the deviation between the third simulation result of the stability simulation of the wind farm by the calibrated electromechanical transient simulation model and the actual operation result of the wind farm is less than the deviation threshold.

[0067] As above Figure 3As shown, in this embodiment, the problematic sub-model in the electromechanical transient simulation model can be corrected according to the verification results to improve the accuracy of the electromechanical transient simulation model, thereby reducing the deviation between the simulation results of the stability simulation of the wind farm using the electromechanical transient simulation model and the actual operation of the power grid, thereby improving the stability of the power system operation.

[0068] From the above, it can be seen that through the technical solution provided by the above embodiment of the present invention, an electromechanical transient simulation model that needs to be calibrated can be obtained, 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 use the electromechanical transient simulation model to perform electromechanical transient simulation on 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 the simulation; the wind farm is connected to the actual power grid simulation system to use the electromechanical transient simulation model 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 the wind farm as a component connected to a real power grid model in the simulation; when there is at least one electrical quantity deviation in the first simulation result and the second simulation result that exceeds the corresponding deviation threshold, the electromechanical transient simulation model is calibrated to obtain a calibration result, Among them, 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 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. The electromechanical transient simulation model is calibrated according to the verification 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 the corrected electromechanical transient simulation model and the actual operation result of the wind farm is less than the deviation threshold value, so as to achieve the purpose of simulating the wind farm using the electromechanical transient simulation model in various simulation scenarios, and determining the problematic parts of the electromechanical transient simulation model based on the simulation result analysis, so as to verify and correct them, and realize the technical effect of reducing the deviation between the simulation result and the actual operation of the power system by calibrating the electromechanical transient simulation model, thereby improving the accuracy of the electromechanical transient simulation model.

[0069] Therefore, the technical solution provided by the above-mentioned embodiment of the present invention solves the technical problem in the related art that the electromechanical transient simulation calculation model of the wind farm is inaccurate, resulting in a large deviation between the simulation result and the actual operation of the power system.

[0070] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

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

[0072] According to an embodiment of the present invention, there is also provided a correction device for a wind farm electromechanical transient simulation model for implementing the correction method for the wind farm electromechanical transient simulation model. Figure 4 is a schematic diagram of a correction device for a wind farm electromechanical transient simulation model according to an embodiment of the present invention, such as Figure 4 As shown, the device comprises: 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 correction device for the electromechanical transient simulation model of a wind farm is described in detail below.

[0073] The first acquisition unit 41 is used to acquire an electromechanical transient simulation model that needs to be calibrated, 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 used to construct a single-machine system of the wind farm, and to perform electromechanical transient simulation on the single-machine system 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 the simulation.

[0075] The third acquisition unit 45 is used to connect the wind farm to the actual power grid simulation system, so as to perform electromechanical transient simulation on the actual power grid simulation system 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 the simulation.

[0076] The fourth acquisition unit 47 is used to calibrate the electromechanical transient simulation model to obtain a calibration result when there is at least one electrical quantity deviation exceeding the corresponding deviation threshold in the first simulation result and the second simulation 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.

[0077] The fifth acquisition unit 49 is used to calibrate the electromechanical transient simulation model according to the verification result to obtain a calibrated electromechanical transient simulation model, so that the deviation between the third simulation result of the stability simulation of the wind farm by the calibrated electromechanical transient simulation model and the actual operation result of the wind farm is less than the deviation threshold.

[0078] It should be noted here that the above-mentioned first acquisition unit 41, second acquisition unit 43, third acquisition unit 45, fourth acquisition unit 47 and fifth acquisition unit 49 correspond to steps S202 to S210 in the above-mentioned embodiments, and the five units have the same instances and application scenarios implemented by the corresponding steps, but are not limited to the contents disclosed in the above-mentioned embodiments.

[0079] As can be seen from the above, in the scheme recorded in the above-mentioned embodiment of the present invention, the first acquisition unit can be used to acquire the electromechanical transient simulation model that needs to be calibrated, 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 perform electromechanical transient simulation on 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 the simulation; then 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 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 the simulation; and then the fourth acquisition unit is used to calibrate the electromechanical transient simulation model when there is at least one electrical quantity deviation in the first simulation result and the second simulation result that exceeds the corresponding deviation threshold. A calibration is performed to obtain a calibration result, wherein 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 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; finally, the electromechanical transient simulation model is calibrated according to the calibration result by using the fifth acquisition unit to obtain a calibrated electromechanical transient simulation model, so that the deviation between the third simulation result of the stability simulation of the wind farm by the calibrated electromechanical transient simulation model and the actual operation result of the wind farm is less than the deviation threshold value, thereby achieving the purpose of simulating the wind farm using the electromechanical transient simulation model in a variety of simulation scenarios, and determining the problematic parts of the electromechanical transient simulation model based on the simulation result analysis, so as to calibrate and correct them, thereby achieving the technical effect of reducing the deviation between the simulation result and the actual operation of the power system by calibrating the electromechanical transient simulation model, and improving the accuracy of the electromechanical transient simulation model.

[0080] Therefore, the technical solution provided by the above-mentioned embodiment of the present invention solves the technical problem in the related art that the electromechanical transient simulation calculation model of the wind farm is inaccurate, resulting in a large deviation between the simulation result and the actual operation of the power system.

[0081] Optionally, the second acquisition unit includes: a construction module, which is used to construct a single-machine infinite system and a single-machine load system of a wind farm, wherein the single-machine infinite system and the single-machine load system both belong to the single-machine system; a first acquisition module, which is used to use the electromechanical transient simulation model to perform a fault-free simulation on the single-machine infinite system to obtain a first simulation sub-result, wherein the fault-free simulation belongs to the electromechanical transient simulation; a second acquisition module, which is used to use the electromechanical transient simulation model to perform an instantaneous short-circuit fault simulation on the single-machine infinite system to obtain a second simulation sub-result, wherein the instantaneous short-circuit fault simulation belongs to the electromechanical transient simulation; a third acquisition module, which is used to use the electromechanical transient simulation model to perform an instantaneous short-circuit fault simulation on the single-machine load system to obtain a third simulation sub-result; a fourth acquisition module, which is used to use the electromechanical transient simulation model to perform a load shedding small disturbance fault simulation on the single-machine load system to obtain a fourth simulation sub-result, wherein the load shedding small disturbance fault simulation belongs to the electromechanical transient simulation.

[0082] Optionally, the third acquisition unit includes: an access module for connecting the wind farm to the actual power grid simulation system; a fifth acquisition module for using the electromechanical transient simulation model to perform a single-loop line three-phase short-circuit fault tripping simulation on the actual power grid simulation system to obtain a fifth simulation sub-result, wherein the single-loop line three-phase short-circuit fault tripping simulation belongs to the electromechanical transient simulation; a sixth acquisition module for using the electromechanical transient simulation model to perform a DC system single-machine lockout fault simulation on the actual power grid simulation system to obtain a sixth simulation sub-result, wherein the DC system single-machine lockout fault simulation belongs to the electromechanical transient simulation; a seventh acquisition module for using the electromechanical transient simulation model to perform a wind farm repeatedly entering and exiting a low voltage ride-through fault simulation on the actual power grid simulation system to obtain a seventh simulation sub-result, wherein the wind farm repeatedly entering and exiting a low voltage ride-through fault simulation belongs to the electromechanical transient simulation.

[0083] Optionally, the fourth acquisition unit includes: an eighth acquisition module, which is used to determine, based on the first simulation result and the second simulation result, that an electrical quantity whose electrical quantity deviation exceeds a corresponding deviation threshold is an abnormal electrical quantity, and obtain the abnormal number of all abnormal electrical quantities; a ninth acquisition module, which is used to compare the abnormal number with a predetermined number to obtain a comparison result; a generation module, which is used to generate a calibration strategy for calibrating the electromechanical transient simulation model based on the comparison result; and a tenth acquisition module, which is used to calibrate the electromechanical transient simulation model according to the calibration strategy to obtain a calibration result.

[0084] Optionally, the generation module includes: a first determination submodule, which is used to determine the verification strategy as follows: when the comparison result indicates that the number of abnormalities is not greater than a predetermined number, the model parameters of the submodel corresponding to the abnormal electrical quantity in the electromechanical transient simulation model are verified; and a second determination submodule, which is used to determine the verification strategy as follows: when the comparison result indicates that the number of abnormalities is greater than a predetermined number, the model parameters of each submodel in the electromechanical transient simulation model are verified in a predetermined order, wherein the predetermined order is the verification order of each submodel.

[0085] Optionally, the first determination submodule includes: a third determination submodule, used to determine the submodel corresponding to the abnormal electrical quantity in the electromechanical transient simulation model as the target submodel; and a first verification submodule, used to verify the model parameters in the target submodel in turn.

[0086] Optionally, the third determination submodule includes: a fourth determination submodule, which is used to determine, when the abnormal electrical quantity is voltage, 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 as the target submodel; a fifth determination submodule, which is used to determine, when the abnormal electrical quantity is voltage, the active control model in the normal state, the active control model during and after the voltage crossing, the reactive control model in the normal state, and the reactive control model during and after the voltage crossing in the electromechanical transient simulation model as the target submodel; a sixth determination submodule, which is used to determine, when the abnormal electrical quantity is voltage, the active control model in the normal state, the active control model during and after the voltage crossing in the electromechanical transient simulation model as the target submodel. When the normal electrical quantity is voltage, the active power control model in the normal state, the active power control model during and after the voltage crossing, and the voltage crossing state judgment model in the electromechanical transient simulation model are determined as the target sub-model; the seventh determination sub-module is used to determine the reactive power control model in the normal state, the reactive power control model during and after the voltage crossing, and the voltage crossing state judgment model in the electromechanical transient simulation model as the target sub-model when the abnormal electrical quantity is voltage; the eighth determination sub-module is used to determine the frequency control model in the electromechanical transient simulation model as the target sub-model when the abnormal electrical quantity is voltage.

[0087] Optionally, the correction device of the wind farm electromechanical transient simulation model also includes: a second verification submodule, used to preferentially calibrate the submodel containing priority model parameters, wherein the priority model parameters include at least: dead zone parameters, limit parameters, proportional-integral-differential controller PID parameters.

[0088] According to another aspect of an embodiment of the present invention, a correction system for a wind farm electromechanical transient simulation model is provided. The correction system for a wind farm electromechanical transient simulation model uses any of the above correction methods for a wind farm electromechanical transient simulation model.

[0089] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is further provided. The computer-readable storage medium includes a stored program, wherein the program executes any one of the above-mentioned methods for calibrating a wind farm electromechanical transient simulation model.

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

[0091] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for executing the following steps: obtaining an electromechanical transient simulation model that needs to be calibrated, 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; constructing a single-machine system of the wind farm, and using the electromechanical transient simulation model to perform electromechanical transient simulation on the single-machine system to obtain a first simulation result, wherein the single-machine system refers to treating the wind farm as an independent power system unit in the simulation; connecting the wind farm to the actual power grid simulation system, and using the electromechanical transient simulation model 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 treating the wind farm as a component in the simulation. Partially connected to a real power grid model; 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 calibrated to obtain a calibration 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 calibrated according to the calibration result to obtain a calibrated electromechanical transient simulation model, so that the deviation between the third simulation result of the stability simulation of the wind farm by the calibrated electromechanical transient simulation model and the actual operation result of the wind farm is less than the deviation threshold.

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

[0093] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: connecting the wind farm to the actual power grid simulation system; using the electromechanical transient simulation model to perform a single-loop line three-phase short-circuit fault tripping simulation on the actual power grid simulation system to obtain a fifth simulation sub-result, wherein the single-loop line three-phase short-circuit fault tripping simulation belongs to the electromechanical transient simulation; using the electromechanical transient simulation model to perform a DC system single-machine lockout fault simulation on the actual power grid simulation system to obtain a sixth simulation sub-result, wherein the DC system single-machine lockout fault simulation belongs to the electromechanical transient simulation; using the electromechanical transient simulation model to perform a wind farm repeatedly entering and exiting a low voltage ride-through fault simulation on the actual power grid simulation system to obtain a seventh simulation sub-result, wherein the wind farm repeatedly entering and exiting a low voltage ride-through fault simulation belongs to the electromechanical transient simulation.

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

[0095] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for executing the following steps: when the comparison result indicates that the number of abnormalities is not greater than a predetermined number, determining the verification strategy as: verifying the model parameters of the sub-model corresponding to the abnormal electrical quantities in the electromechanical transient simulation model; when the comparison result indicates that the number of abnormalities is greater than a predetermined number, determining the verification strategy as: verifying 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.

[0096] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for executing the following steps: determining the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model as the target sub-model; and checking the model parameters in the target sub-model in turn.

[0097] Optionally, a submodel corresponding to the abnormal electrical quantity in the electromechanical transient simulation model is determined as a target submodel, including: when the abnormal electrical quantity is voltage, determining the primary system model of the wind turbine motor and converter, the wind power model and the wind turbine shaft system model in the electromechanical transient simulation model as the target submodel; when the abnormal electrical quantity is voltage, determining the active control model in the normal state, the active control model during and after voltage crossing, the reactive control model in the normal state, and the reactive control model during and after voltage crossing in the electromechanical transient simulation model as the target submodel; when the abnormal electrical quantity is voltage, determining the active control model in the normal state, the active control model during and after voltage crossing, and the voltage crossing state judgment model in the electromechanical transient simulation model as the target submodel; when the abnormal electrical quantity is voltage, determining the reactive control model in the normal state, the reactive control model during and after voltage crossing, and the voltage crossing state judgment model in the electromechanical transient simulation model as the target submodel; when the abnormal electrical quantity is voltage, determining the frequency control model in the electromechanical transient simulation model as the target submodel.

[0098] Optionally, the correction method of the wind farm electromechanical transient simulation model also includes: preferentially calibrating the sub-model containing priority model parameters, wherein the priority model parameters at least include: dead zone parameters, limit parameters, proportional-integral-differential controller PID parameters.

[0099] According to another aspect of an embodiment of the present invention, a processor is further provided, and the processor is used to run a program, wherein when the program is run, any one of the above-mentioned methods for calibrating a wind farm electromechanical transient simulation model is executed.

[0100] According to another aspect of an embodiment of the present invention, a computer program product is provided, comprising computer instructions, which, when executed by a processor, execute any one of the above-mentioned methods for calibrating a wind farm electromechanical transient simulation model.

[0101] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0102] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0103] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

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

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

[0106] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0107] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for calibrating a wind farm electromechanical transient simulation model, characterized in that: include: Acquire an electromechanical transient simulation model that needs to be calibrated, 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; Constructing a single-machine system of the wind farm, and performing electromechanical transient simulation on the single-machine system 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 the simulation; Connecting the wind farm to an actual power grid simulation system, and performing electromechanical transient simulation on the actual power grid simulation system 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 the simulation; In the case that 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 calibrated to obtain a calibration 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 of the electrical quantities corresponds to one electrical quantity threshold, and each of the electrical quantity deviations corresponds to one deviation threshold; The electromechanical transient simulation model is corrected according to the verification result to obtain the corrected electromechanical transient simulation model, so that the deviation between the third simulation result of the stability simulation of the wind farm by the corrected electromechanical transient simulation model and the actual operation result of the wind farm is less than a deviation threshold.

2. The method for calibrating a wind farm electromechanical transient simulation model according to claim 1, characterized in that: Constructing a single-machine system of the wind farm to perform electromechanical transient simulation on the single-machine system using the electromechanical transient simulation model to obtain a first simulation result, including: 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 the single-machine system; Performing a fault-free simulation on the single-machine infinite 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; Using the electromechanical transient simulation model to perform an instantaneous short circuit fault simulation on the single-machine infinite system to obtain a second simulation sub-result, wherein the instantaneous short circuit fault simulation belongs to the electromechanical transient simulation; Using the electromechanical transient simulation model to perform instantaneous short-circuit fault simulation on the single-machine load system to obtain a third simulation sub-result; The electromechanical transient simulation model is used to perform a load shedding small disturbance fault simulation on the single-machine load system to obtain a fourth simulation sub-result, wherein the load shedding small disturbance fault simulation belongs to the electromechanical transient simulation.

3. The method for calibrating a wind farm electromechanical transient simulation model according to claim 1, characterized in that: 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, including: Connecting the wind farm to the actual power grid simulation system; Using the electromechanical transient simulation model to perform a single-circuit line three-phase short-circuit fault tripping simulation on the actual power grid simulation system, 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; Using the electromechanical transient simulation model to perform a DC system single machine locking fault simulation on the actual power grid simulation system to obtain a sixth simulation sub-result, wherein the DC system single machine locking fault simulation belongs to the electromechanical transient simulation; The electromechanical transient simulation model is used to perform a wind farm repeatedly entering and exiting low voltage ride-through fault simulation on the actual power grid simulation system to obtain a seventh simulation sub-result, wherein the wind farm repeatedly entering and exiting low voltage ride-through fault simulation belongs to the electromechanical transient simulation.

4. The method for calibrating a wind farm electromechanical transient simulation model according to claim 1, characterized in that: When at least one electrical quantity deviation in the first simulation result and the second simulation result exceeds a corresponding deviation threshold, the electromechanical transient simulation model is calibrated to obtain a calibration result, including: Determine, according to the first simulation result and the second simulation result, that the electrical quantity whose electrical quantity deviation exceeds the corresponding deviation threshold is an abnormal electrical quantity, and obtain the abnormal number of all the abnormal electrical quantities; Comparing the abnormal quantity with a predetermined quantity to obtain a comparison result; generating a calibration strategy for calibrating the electromechanical transient simulation model according to the comparison result; The electromechanical transient simulation model is calibrated according to the calibration strategy to obtain the calibration result.

5. The method for calibrating a wind farm electromechanical transient simulation model according to claim 4, characterized in that: Generating a calibration strategy for calibrating the electromechanical transient simulation model according to the comparison result includes: In the case where the comparison result indicates that the number of abnormalities is not greater than the predetermined number, determining the verification strategy is: verifying the model parameters of the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model; When the comparison result indicates that the number of anomalies is greater than the predetermined number, the verification strategy is determined as: verifying 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.

6. The method for calibrating a wind farm electromechanical transient simulation model according to claim 5, characterized in that: Verifying the model parameters of the 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; The model parameters in the target sub-model are checked in turn.

7. The method for calibrating a wind farm electromechanical transient simulation model according to claim 6, characterized in that: Determining the sub-model corresponding to the abnormal electrical quantity in the electromechanical transient simulation model as a target sub-model includes: In the case where the abnormal electrical quantity is voltage, determining the wind turbine 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 where the abnormal electrical quantity is voltage, determining the active control model in the normal state, the active control model during and after the voltage ride-through, the reactive control model in the normal state, and the reactive control model during and after the voltage ride-through in the electromechanical transient simulation model as the target sub-model; In the case where the abnormal electrical quantity is voltage, determining the active power control model in the normal state, the active power control model during and after the 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 where the abnormal electrical quantity is voltage, determining 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; When the abnormal electrical quantity is voltage, the frequency control model in the electromechanical transient simulation model is determined as the target sub-model.

8. The method for calibrating a wind farm electromechanical transient simulation model according to claim 5, characterized in that: Also includes: The sub-model containing priority model parameters is checked preferentially, wherein the priority model parameters at least include: dead zone parameters, limit parameters, proportional-integral-differential controller PID parameters.

9. A calibration device for a wind farm electromechanical transient simulation model, characterized in that: include: A first acquisition unit is used to acquire an electromechanical transient simulation model that needs to be calibrated, 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 second acquisition unit is used to construct a single-machine system of the wind farm, so as to perform electromechanical transient simulation on the single-machine system 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 the simulation; a third acquisition unit, configured to connect the wind farm to an actual power grid simulation system, so as to perform an electromechanical transient simulation on the actual power grid simulation system using the electromechanical transient simulation model, and 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 the simulation; a fourth acquisition unit, configured to calibrate the electromechanical transient simulation model to obtain a calibration result when at least one electrical quantity deviation in the first simulation result and the second simulation result exceeds 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 the accuracy of the electromechanical transient simulation model, each of the electrical quantities corresponds to one of the electrical quantity thresholds, and each of the electrical quantity deviations corresponds to one of the deviation thresholds; The fifth acquisition unit is used to calibrate the electromechanical transient simulation model according to the verification result to obtain the calibrated electromechanical transient simulation model, so that the deviation between the third simulation result of the stability simulation of the wind farm performed by the calibrated electromechanical transient simulation model and the actual operation result of the wind farm is less than a deviation threshold.

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

Images