Voltage support control method, device, computer equipment and medium during power grid failure

Abstract

The present invention relates to the field of renewable energy power generation technology, and discloses a voltage support control method, device, computer equipment and medium when a power grid fails. According to the method of the present invention, after a power grid fails, a second reactive current margin of a generator set in a renewable energy power station is considered when generating a voltage control instruction. When subsequently performing voltage support control on the power grid, the reactive current output by the renewable energy generator set is utilized, which effectively reduces the demand for reactive current output by an energy storage system, thereby reducing the requirement for capacity configuration of the energy storage system. The voltage support control of the power grid is performed through the coordination among the generator set, reactive compensation device and energy storage system in the renewable energy power station, thereby improving the stability of the power system. The problem in the related art that when the maximum reactive current output by the reactive compensation device is insufficient to provide support for a grid connection point, reactive current is only provided by the energy storage system, which not only requires a high capacity configuration of the energy storage system, but also causes waste of electric energy is solved.

Description

Technical Field

[0001] The present invention relates to the field of renewable energy power generation technology, and in particular to a voltage support control method, device, computer equipment and medium during power grid failure. Background Art

[0002] As the penetration rate of renewable energy power generation continues to increase, in addition to ensuring that the power output of renewable energy itself remains stable, it is also necessary to respond to changes in grid connection point voltage during grid system fault ride-through, provide support for the grid connection point voltage, and ensure system stability.

[0003] At present, when the power grid system is in a fault crossing state, the new energy power station generally outputs reactive current through the coordination of the reactive compensation device (StaticVar Generator, SVG) and the energy storage system to provide voltage support for the grid connection point. During coordinated control, the reactive current output by the reactive compensation device is generally prioritized to provide voltage support for the grid connection point. When the maximum reactive current output by the reactive compensation device is insufficient to provide support for the grid connection point, the energy storage system and the reactive compensation device jointly output reactive current to provide voltage support for the grid connection point. However, the energy storage system is an active output device. When the maximum reactive current output by the reactive compensation device is insufficient to provide support for the grid connection point, the reactive current is provided only by the energy storage system. Not only does it require a high capacity configuration of the energy storage system, it also causes a waste of electric energy. Summary of the invention

[0004] In view of this, the present invention provides a voltage support control method, device, computer equipment and medium during power grid fault to solve the problem that when the maximum reactive current output by the reactive compensation device is insufficient to provide support for the grid connection point, only the reactive current is provided by the energy storage system, which not only has high capacity configuration requirements for the energy storage system, but also causes waste of electric energy.

[0005] In a first aspect, the present invention provides a method for controlling voltage support during a power grid fault, the method comprising: when a power grid fault is monitored, obtaining the grid connection point voltage of the new energy power station, the reactive power of a reactive compensation device, the active power of a new energy generator set and the active power of an energy storage system; determining the reactive current to be provided by the new energy power station according to the voltage of the grid connection point of the new energy power station; determining a first reactive current margin of the reactive compensation device according to the reactive power of the reactive compensation device; determining a second reactive current margin of the new energy generator set according to the active power of the new energy generator set; determining a third reactive current margin of the energy storage system according to the active power of the energy storage system; generating a voltage control instruction according to the first reactive current margin, the second reactive current margin, the third reactive current margin and the reactive current to be provided by the new energy power station, the voltage control instruction being used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

[0006] The voltage support control method during power grid failure provided by the present invention calculates the reactive current to be provided by the new energy power station based on the grid connection point voltage of the new energy power station during power grid failure, and generates a voltage control instruction based on the first reactive current margin of the reactive compensation device, the third reactive power margin of the energy storage system, the second reactive current margin of the new energy generator set, and the reactive current to be provided by the new energy power station. The voltage control instruction is used to control the reactive compensation device, the new energy generator set, and the energy storage system to provide reactive current to the power grid. The method provided by the present invention takes into account the second reactive current margin of the generator set in the new energy power station when generating a voltage control instruction after a power grid failure. When subsequently performing voltage support control on the power grid, the reactive current output by the new energy generator set is utilized, effectively reducing the demand for reactive current output by the energy storage system, thereby reducing the requirement for the capacity configuration of the energy storage system. The voltage support control of the power grid is performed through the coordination among the generator set, reactive compensation device and energy storage system in the new energy power station, thereby improving the stability of the power system and solving the problem in the related art that when the maximum reactive current output by the reactive compensation device is insufficient to provide support for the grid connection point, reactive current is only provided by the energy storage system, which not only requires a high capacity configuration of the energy storage system but also causes waste of electric energy.

[0007] In an optional embodiment, when a power grid fault is monitored, before the step of obtaining the grid connection point voltage of the new energy power station, the reactive power of the reactive compensation device, the active power of the new energy generator set and the active power of the energy storage system, the method also includes: obtaining the measured voltage of the grid connection point of the new energy power station and the rated voltage of the grid connection point; judging whether the power grid is faulty based on the measured voltage of the grid connection point of the new energy power station, the rated voltage of the grid connection point and a preset voltage fluctuation range, and obtaining a judgment result.

[0008] The method provided in this optional implementation manner determines whether the power grid is faulty by using the measured voltage at the grid connection point of the new energy power station, the rated voltage at the grid connection point, and a preset voltage fluctuation range, which can make the judgment result of the power grid fault more accurate.

[0009] In an optional embodiment, the step of determining the reactive current to be provided by the new energy power station according to the voltage of the grid connection point of the new energy power station includes: obtaining the rated current value of the grid connection point of the new energy power station; determining the per-unit value of the grid connection point voltage of the new energy power station based on the actual measured voltage of the grid connection point of the new energy power station and the rated voltage of the grid connection point; determining the reactive current to be provided by the new energy power station based on the per-unit value of the grid connection point voltage of the energy power station and the rated current value of the grid connection point of the new energy power station.

[0010] The method provided in this optional implementation manner can accurately obtain the reactive current to be provided by the new energy power station when a power grid failure occurs.

[0011] In an optional embodiment, the step of determining a first reactive current margin of the reactive compensation device based on the reactive power of the reactive compensation device includes: obtaining the rated capacity of the reactive compensation device; determining the reactive power margin of the reactive compensation device based on the rated capacity of the reactive compensation device, the reactive power of the reactive compensation device, and the reactive current to be provided by the new energy power station; determining the first reactive current margin based on the reactive power margin of the reactive compensation device and the grid connection point voltage of the new energy power station.

[0012] In an optional embodiment, the new energy power station includes multiple new energy generator sets, and the step of determining the second reactive current margin of the new energy generator sets according to the active power of the new energy generator sets includes: obtaining the maximum apparent power corresponding to different generator sets respectively; determining the reactive power margin of the corresponding new energy generator sets based on the active power and maximum apparent power of each new energy generator set; determining the total reactive power margin of different new energy generator sets; and determining the second reactive current margin based on the total reactive power margin of different new energy generator sets and the grid connection point voltage of the new energy power station.

[0013] In an optional embodiment, the energy storage system includes multiple energy storage inverters, and the step of determining the third reactive current margin of the energy storage system according to the active power of the energy storage system includes: obtaining the active power and the maximum apparent power output by each energy storage inverter in the energy storage system; determining the reactive power margin of the corresponding energy storage inverter based on the active power and the maximum apparent power output by each energy storage inverter; determining the total reactive power margin of different energy storage inverters; and determining the third reactive current margin based on the total reactive power margin of different energy storage inverters and the grid connection point voltage of the new energy power station.

[0014] In an optional implementation, the step of generating a voltage control instruction according to the first reactive current margin, the second reactive current margin, the third reactive current margin, and the reactive current to be provided by the new energy power station includes: comparing the reactive current to be provided by the new energy power station with the sum of the first reactive current margin and the third reactive current margin to obtain a comparison result; when the reactive current to be provided by the new energy power station is less than or equal to the sum of the first reactive current margin and the third reactive current margin, determining a first reactive current to be output by the reactive compensation device and a second reactive current to be output by the energy storage system; and determining a reactive current to be output according to the first reactive current to be output and the second reactive current to be output. Generate a first control instruction, the first control instruction is used to control the reactive compensation device and the energy storage system to provide reactive current to the power grid; when the reactive current to be provided by the new energy power station is greater than the sum of the first reactive current margin and the third reactive current margin, determine the third reactive current to be output of the reactive compensation device, the fourth reactive current to be output of the energy storage system, and the fifth reactive current to be output of the new energy generator set; generate a second control instruction based on the third reactive current to be output, the fourth reactive current to be output, and the fifth reactive current to be output, the second control instruction is used to control the reactive compensation device, the new energy generator set, and the energy storage system to provide reactive current to the power grid.

[0015] In an optional embodiment, the step of generating a voltage control instruction according to the first reactive current margin, the second reactive current margin, the third reactive current margin and the reactive current to be provided by the new energy power station also includes: when the sum of the first reactive current margin, the second reactive current margin and the third reactive current margin is less than the reactive current to be provided by the new energy power station, controlling the active power of the energy storage system to be reduced to meet the first preset condition, and obtaining a fourth reactive current margin of the energy storage system; when the sum of the first reactive current margin, the second reactive current margin and the fourth reactive current margin is greater than or equal to the reactive current to be provided by the new energy power station, generating a third control instruction, and the third control instruction Used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid; when the sum of the first reactive current margin, the second reactive current margin and the fourth reactive current margin is less than the reactive current to be provided by the new energy power station, control the active power of the new energy generator to meet the second preset condition, and obtain the fifth reactive current margin of the new energy generator set; when the sum of the first reactive current margin, the fourth reactive current margin and the fifth reactive current margin is greater than or equal to the reactive current to be provided by the new energy power station, generate a fourth control instruction, and the fourth control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

[0016] In a second aspect, the present invention provides a voltage support control device for a power grid fault, an acquisition module for acquiring the grid connection point voltage of the new energy power station, the reactive power of the reactive compensation device, the active power of the new energy generator set and the active power of the energy storage system when a power grid fault is detected; a first determination module for determining the reactive current to be provided by the new energy power station according to the voltage of the grid connection point of the new energy power station; a second determination module for determining the first reactive current margin of the reactive compensation device according to the reactive power of the reactive compensation device; a third determination module for determining the second reactive current margin of the new energy generator set according to the active power of the new energy generator set; a fourth determination module for determining the third reactive current margin of the energy storage system according to the active power of the energy storage system; an instruction generation module for generating a voltage control instruction according to the first reactive current margin, the second reactive current margin, the third reactive current margin and the reactive current to be provided by the new energy power station, and the voltage control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

[0017] In an optional embodiment, the acquisition module includes: a first acquisition submodule, used to obtain the actual measured voltage of the grid connection point of the new energy power station and the rated voltage of the grid connection point; a judgment submodule, used to judge whether the power grid is faulty based on the actual measured voltage of the grid connection point of the new energy power station, the rated voltage of the grid connection point and a preset voltage fluctuation range, and obtain a judgment result.

[0018] In an optional embodiment, the first determination module includes: a second acquisition submodule, used to obtain the rated current value of the grid connection point of the new energy power station; a first determination submodule, used to determine the voltage per unit value of the grid connection point of the new energy power station based on the actual measured voltage of the grid connection point of the new energy power station and the rated voltage of the grid connection point; a second determination submodule, used to determine the reactive current to be provided by the new energy power station based on the voltage per unit value of the grid connection point of the energy power station and the rated current value of the grid connection point of the new energy power station.

[0019] In an optional embodiment, the second determination module includes: a third acquisition submodule, used to acquire the rated capacity of the reactive compensation device; a third determination submodule, used to determine the reactive power margin of the reactive compensation device based on the rated capacity of the reactive compensation device, the reactive power of the reactive compensation device and the reactive current to be provided by the new energy power station; a fourth determination submodule, used to determine the first reactive current margin based on the reactive power margin of the reactive compensation device and the grid connection point voltage of the new energy power station.

[0020] In an optional embodiment, the third determination module includes: a fourth acquisition submodule, used to acquire the maximum apparent power corresponding to different generator sets; a fifth determination submodule, used to determine the reactive power margin of the corresponding new energy generator set based on the active power and maximum apparent power of each new energy generator set; a sixth determination submodule, used to determine the total reactive power margin of different new energy generator sets; and a seventh determination submodule, used to determine the second reactive current margin based on the total reactive power margin of different new energy generator sets and the grid connection point voltage of the new energy power station.

[0021] In a third aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the voltage support control method during a power grid fault according to the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0022] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the voltage support control method during a power grid fault according to the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 is a flow chart of a method for controlling voltage support during a power grid fault according to an embodiment of the present invention;

[0025] Figure 2 is a flow chart of another method for controlling voltage support during a power grid fault according to an embodiment of the present invention;

[0026] Figure 3 is a flow chart of another method for controlling voltage support during a power grid fault according to an embodiment of the present invention;

[0027] Figure 4 is a structural block diagram of a voltage support control device during a power grid fault according to an embodiment of the present invention;

[0028] Figure 5 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] In the related art, when the power grid system is in the process of fault crossing, the new energy power station generally cooperates with the reactive compensation device (Static Var Generator, SVG) and the energy storage system to output reactive current and provide voltage support for the grid connection point. During coordinated control, the reactive compensation device generally gives priority to outputting reactive current to provide voltage support for the grid connection point. When the maximum reactive current output by the reactive compensation device is insufficient to provide support for the grid connection point, the energy storage system and the reactive compensation device jointly output reactive current to provide voltage support for the grid connection point. However, the energy storage system is an active output device. When the maximum reactive current output by the reactive compensation device is insufficient to provide support for the grid connection point, the reactive current is only provided by the energy storage system. Not only does it require a high capacity configuration of the energy storage system, it also causes a waste of electric energy.

[0031] In view of this, the present invention provides a voltage support control method when a power grid fails, which can be applied to a server to realize voltage support control of the power grid when the power grid fails. The method provided by the present invention takes into account the second reactive current margin of the generator set in the new energy power station when generating the voltage control instruction after the power grid fails. When performing the voltage support control of the power grid later, the reactive current output by the new energy generator set is utilized, which effectively reduces the demand for reactive current output by the energy storage system, thereby reducing the requirements for the capacity configuration of the energy storage system. The voltage support control of the power grid is performed through the coordination between the generator set, reactive compensation device and energy storage system in the new energy power station, which improves the stability of the power system and solves the problem in the related technology that when the maximum reactive current output by the reactive compensation device is insufficient to provide support for the grid connection point, the reactive current is only provided by the energy storage system, which not only requires a high capacity configuration of the energy storage system, but also causes waste of electric energy.

[0032] According to an embodiment of the present invention, an embodiment of a voltage support control method during a power grid fault 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.

[0033] In this embodiment, a voltage support control method for power grid failure is provided, which can be used for the above-mentioned server. Figure 1 is a flow chart of a voltage support control method when a power grid fails according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0034] Step S101, when a power grid fault is detected, the grid connection point voltage of the new energy power station, the reactive power of the reactive power compensation device, the active power of the new energy generator set and the active power of the energy storage system are obtained.

[0035] Exemplarily, the power grid can be any power grid that requires voltage support control, and the power grid is connected to a new energy power station, which includes multiple generator sets. In the embodiment of the present application, the new energy power station may include but is not limited to a wind power station. The reactive power compensation device may include but is not limited to a static var compensator (SVG), which is an electronic reactive power compensation device that uses high-power semiconductor devices to control capacitors or inductors to generate or absorb reactive power. The reactive power of the reactive compensation device, the active power of the new energy generator set, and the active power of the energy storage system are monitored by a pre-set power monitoring device.

[0036] Step S102, determining the reactive current to be provided by the new energy power station according to the voltage of the grid connection point of the new energy power station.

[0037] Illustratively, in an embodiment of the present application, the reactive current to be provided by the new energy power station can be calculated based on the grid connection point of the new energy power station and the voltage of the grid connection point when it is operating normally.

[0038] Step S103: determining a first reactive current margin of the reactive compensation device according to the reactive power of the reactive compensation device.

[0039] Exemplarily, the first reactive current margin is used to characterize the output capacity of the residual reactive power of the reactive compensation device, and the reactive current margin of the reactive compensation device can be calculated based on the reactive power of the reactive compensation device.

[0040] Step S104: determining a second reactive current margin of the new energy generator set according to the active power of the new energy generator set.

[0041] Exemplarily, a new energy power station may include multiple generator sets. In an embodiment of the present application, the second reactive current margin is the sum of the reactive margins of all generator sets in the new energy power station. The corresponding reactive margin is calculated based on the active power of each generator set, and finally the sum of the reactive margins of all generator sets in the new energy power station is obtained.

[0042] Step S105: determining a third reactive current margin of the energy storage system according to the active power of the energy storage system.

[0043] Exemplarily, in an embodiment of the present application, the third reactive current margin is the total reactive current margin of the energy storage system in the new energy power station.

[0044] Step S106, generating a voltage control instruction according to the first reactive current margin, the second reactive current margin, the third reactive current margin and the reactive current to be provided by the new energy power station, the voltage control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

[0045] Exemplarily, in an embodiment of the present application, a voltage control instruction is generated based on the first reactive current margin, the second reactive current margin, the third reactive current margin and the reactive current to be provided by the new energy power station. The voltage control instruction is used to coordinate the reactive current output by the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current for the power grid, thereby realizing voltage support control of the power grid.

[0046] The voltage support control method during power grid failure provided in this embodiment takes into account the second reactive current margin of the generator set in the new energy power station when generating the voltage control instruction after the power grid failure. The reactive current output by the new energy generator set is used in the subsequent voltage support control of the power grid, which effectively reduces the demand for reactive current output by the energy storage system, thereby reducing the requirement for the capacity configuration of the energy storage system. The voltage support control of the power grid is performed through the coordination between the generator set, reactive compensation device and energy storage system in the new energy power station, which improves the stability of the power system and solves the problem in the related art that when the maximum reactive current output by the reactive compensation device is insufficient to provide support for the grid connection point, the reactive current is only provided by the energy storage system, which not only has high requirements for the capacity configuration of the energy storage system, but also causes waste of electric energy.

[0047] In this embodiment, a voltage support control method for power grid failure is provided, which can be used for the above-mentioned server. Figure 2 is a flow chart of a voltage support control method when a power grid fails according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0048] Step S201, when a grid fault is detected, the grid connection point voltage of the new energy power station, the reactive power of the reactive power compensation device, the active power of the new energy generator set and the active power of the energy storage system are obtained. Figure 1 Step S101 of the illustrated embodiment will not be described in detail here.

[0049] In some optional implementations, before the above step S201, the method further includes the following steps:

[0050] Step a1, obtaining the measured voltage of the grid connection point and the rated voltage of the grid connection point of the new energy power station.

[0051] Step a2, judging whether the power grid is faulty based on the measured voltage at the grid connection point of the new energy power station, the rated voltage at the grid connection point and a preset voltage fluctuation range, and obtaining a judgment result.

[0052] For example, in the embodiment of the present application, the grid connection point voltage of the new energy power station can be expressed as U g Indicates that the rated voltage of the grid point can be expressed as U N It means that when 0.2×U N ≤U g ≤0.9×U N or 1.1×U N ≤U g ≤1.3×U N When the system enters the fault ride-through process, it can be determined that a power grid fault has occurred.

[0053] Step S202: determining the reactive current to be provided by the new energy power station according to the voltage of the grid connection point of the new energy power station.

[0054] Specifically, the above step S202 includes:

[0055] Step S2021, obtaining the rated current value of the grid connection point of the new energy power station.

[0056] For example, in the embodiment of the present application, the rated current value of the grid-connected point of the new energy power station can be expressed as I N express.

[0057] Step S2022, determining the voltage per unit value of the grid connection point of the new energy power station based on the measured voltage of the grid connection point of the new energy power station and the rated voltage of the grid connection point.

[0058] Exemplarily, the voltage per unit value of the grid connection point of the new energy power station is the ratio of the measured voltage at the grid connection point to the rated voltage at the grid connection point. In the embodiment of the present application, the voltage per unit value of the grid connection point of the new energy power station is represented by U t It indicates that,

[0059] Step S2023, determining the reactive current to be provided by the new energy power station based on the voltage per unit value of the energy power station grid connection point and the rated current value of the new energy power station grid connection point.

[0060] Exemplarily, in the embodiment of the present application, the reactive current to be provided by the new energy power station is determined by the following formula (1):

[0061]

[0062] Among them, ΔI t It is the reactive current to be provided by the new energy power station, and can also be called the dynamic reactive current increment of the new energy power station; K1 and K2 are the dynamic reactive current proportional coefficients.

[0063] Step S203: determining a first reactive current margin of the reactive compensation device according to the reactive power of the reactive compensation device.

[0064] Specifically, the above step S203 includes:

[0065] Step S2031, obtaining the rated capacity of the reactive power compensation device.

[0066] Exemplarily, in an embodiment of the present application, the rated capacity of the reactive power compensation device can be obtained through the capacity description in the attribute information of the reactive power compensation device.

[0067] Step S2032: determining the reactive power margin of the reactive compensation device based on the rated capacity of the reactive compensation device, the reactive power of the reactive compensation device, and the reactive current to be provided by the new energy power station.

[0068] Exemplarily, in the embodiment of the present application, the reactive power margin of the reactive power compensation device can be determined by the following formula (2):

[0069]

[0070] Among them, S svg is the rated capacity of the reactive power compensation device SVG, Q svg,r is the reactive power of the reactive power compensation device SVG, Q svg,res It is the reactive power margin of the reactive power compensation device.

[0071] Step S2033: determining a first reactive current margin based on the reactive power margin of the reactive compensation device and the grid connection point voltage of the new energy power station.

[0072] Exemplarily, in the embodiment of the present application, the first reactive current margin can be calculated by the following formula (3):

[0073]

[0074] Among them, I svg,res is the first reactive current margin, and the meanings of other variables refer to the above and will not be repeated here.

[0075] Step S204: determining a second reactive current margin of the new energy generator set according to the active power of the new energy generator set.

[0076] Specifically, the above step S204 includes:

[0077] Step S2041, obtaining the maximum apparent power corresponding to different generator sets.

[0078] For example, in the embodiment of the present application, the maximum apparent power corresponding to different generator sets can be expressed as S w,g Indicates that S w,g Indicates the maximum apparent power of the g-th generator set.

[0079] Step S2042: determining the reactive power margin of the corresponding new energy generator set based on the active power and the maximum apparent power of each new energy generator set.

[0080] For example, in the embodiment of the present application, the reactive power margin of the new energy generator set can be calculated by the following formula (4):

[0081]

[0082] Among them, Q w,res,g represents the reactive power margin of the g-th generator set, P w,g Represents the active power of the g-th generator set.

[0083] Step S2043, determining the total reactive power margin of different new energy generating sets.

[0084] For example, in the embodiment of the present application, the total reactive power margin of different new energy generator sets can be determined by the following formula (5):

[0085]

[0086] Among them, Q w,res The total reactive power margin of different renewable energy generator sets, g is the identifier of the renewable energy generator set, and n is the number of renewable energy generator sets.

[0087] Step S2044: determining a second reactive current margin based on the total reactive power margins of different renewable energy power generation groups and the grid connection point voltage of the renewable energy power station.

[0088] Exemplarily, in the embodiment of the present application, the second reactive current margin may be determined by the following formula (6):

[0089]

[0090] Among them, I w,res is the second reactive current margin. The meanings of other variables are as mentioned above and will not be repeated here.

[0091] Step S205: determining a third reactive current margin of the energy storage system according to the active power of the energy storage system.

[0092] Step S206, generating a voltage control instruction according to the first reactive current margin, the second reactive current margin, the third reactive current margin and the reactive current to be provided by the new energy power station, the voltage control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

[0093] In this embodiment, a voltage support control method for power grid failure is provided, which can be used for the above-mentioned server. Figure 3 is a flow chart of a voltage support control method when a power grid fails according to an embodiment of the present invention. Figure 3 As shown, the process includes the following steps:

[0094] Step S301, when a grid fault is detected, the grid connection point voltage of the new energy power station, the reactive power of the reactive power compensation device, the active power of the new energy generator set and the active power of the energy storage system are obtained. Figure 1 Step S101 of the illustrated embodiment will not be described in detail here.

[0095] Step S302: determining the reactive current to be provided by the new energy power station according to the voltage of the grid connection point of the new energy power station.

[0096] Step S303: determining a first reactive current margin of the reactive compensation device according to the reactive power of the reactive compensation device.

[0097] Step S304: determining a second reactive current margin of the new energy generator set according to the active power of the new energy generator set.

[0098] Step S305: determining a third reactive current margin of the energy storage system according to the active power of the energy storage system.

[0099] Specifically, the energy storage system includes multiple energy storage inverters, and the above step S305 includes:

[0100] Step S3051, obtaining the active power and maximum apparent power output by each energy storage inverter in the energy storage system.

[0101] For example, in the embodiment of the present application, the maximum apparent power of the jth energy storage inverter can be expressed as S BS,j Indicates that the active power output by the jth energy storage inverter can be expressed as P BS,j express.

[0102] Step S3052: Determine the reactive power margin of the corresponding energy storage inverter based on the active power and the maximum apparent power output by each energy storage inverter.

[0103] Exemplarily, in the embodiment of the present application, the reactive power margin of the energy storage inverter can be determined by the following formula (7):

[0104]

[0105] Among them, Q BS,res,j is the reactive power margin of the j-th energy storage inverter. The meanings of other variables are as mentioned above and will not be repeated here.

[0106] Step S3053, determining the total reactive power margin of different energy storage inverters.

[0107] Exemplarily, in the embodiment of the present application, the total reactive power margin can be determined by the following formula (8):

[0108]

[0109] Among them, Q BS,res is the total reactive power margin, and m is the number of inverters in the energy storage system.

[0110] Step S3054: determining a third reactive current margin based on the total reactive power margins of different energy storage inverters and the grid connection point voltage of the new energy power station.

[0111] Exemplarily, in the embodiment of the present application, the third reactive current margin may be determined by the following formula (9):

[0112]

[0113] Among them, I BS,res is the third reactive current margin, and its variable meaning is described above and will not be repeated here.

[0114] Step S306, generating a voltage control instruction according to the first reactive current margin, the second reactive current margin, the third reactive current margin and the reactive current to be provided by the new energy power station, the voltage control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

[0115] Specifically, the above step S306 includes:

[0116] Step S3061, comparing the reactive current to be provided by the new energy power station with the sum of the first reactive current margin and the third reactive current margin to obtain a comparison result.

[0117] In the present application embodiment, when I svg,res ≥|ΔI t |, the first reactive current margin of SVG meets the dynamic reactive current requirement of the power grid. At this time, it is only necessary to use SVG to provide reactive current for the power grid based on formula (1).

[0118] Step S3062: When the reactive current to be provided by the new energy power station is less than or equal to the sum of the first reactive current margin and the third reactive current margin, determine the first reactive current to be output by the reactive compensation device and the second reactive current to be output by the energy storage system.

[0119] For example, in the present application embodiment, when I svg,res ≥|ΔI t |, the first reactive current margin of SVG meets the dynamic reactive current requirement of the power grid. At this time, it is only necessary to use SVG to provide reactive current for the power grid based on formula (1). svg,res <|ΔI t |, the SVG reactive power margin does not meet the dynamic reactive current requirements of the power grid, and the reactive current margin of the energy storage needs to be used. svg,res +I BS,res ≥|ΔI t |, the reactive power margin of SVG and energy storage meets the dynamic reactive current requirement of the power grid. At this time, SVG provides reactive current (the first reactive current to be output) according to the maximum margin, that is, The reactive current (second reactive current to be output) provided by the energy storage system is I BS =ΔI t -I svg .

[0120] Step S3063: Generate a first control instruction according to the first reactive current to be output and the second reactive current to be output, wherein the first control instruction is used to control the reactive compensation device and the energy storage system to provide reactive current to the power grid.

[0121] Step S3064, when the reactive current to be provided by the new energy power station is greater than the sum of the first reactive current margin and the third reactive current margin, determine the third reactive current to be output by the reactive compensation device, the fourth reactive current to be output by the energy storage system, and the fifth reactive current to be output by the new energy generator set.

[0122] For example, in the present application embodiment, when I svg,res +I BS,res <|ΔI t |, the total reactive current margin of SVG and energy storage system does not meet the dynamic reactive current requirement of the power grid. At this time, the reactive current margin of the new energy generator set needs to be used. The total reactive current margin of the new energy power station is I res =I svg,res +I w,res +I BS,res , when I res ≥|ΔI t |, the total reactive current margin of the new energy power station meets the dynamic reactive current requirements of the power grid. At this time, SVG still provides reactive current (the third reactive current to be output) according to the maximum margin, that is, The energy storage system provides reactive current (the fourth reactive current to be output) according to the maximum margin, that is, The reactive current (fifth reactive current to be output) provided by the generator set in the new energy power station is I w =ΔI t -I svg -I BS .

[0123] Step S3065, generating a second control instruction based on the third reactive current to be output, the fourth reactive current to be output and the fifth reactive current to be output, the second control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

[0124] In some optional implementations, the above step S306 further includes:

[0125] Step b1, when the sum of the first reactive current margin, the second reactive current margin and the third reactive current margin is less than the reactive current to be provided by the new energy power station, the active power of the energy storage system is controlled to be reduced to meet the first preset condition, and the fourth reactive current margin of the energy storage system is obtained.

[0126] For example, when I res <|ΔI t |, the total reactive current margin of the new energy power station does not meet the dynamic reactive current requirements of the power grid. According to the principle of reactive power priority during power grid failure, the active power of the new energy power station needs to be reduced. Considering the economic efficiency, the active power of the energy storage system is reduced first, and the total reactive power margin of the energy storage system increases. When the active power of the energy storage system is reduced to I res ≥|ΔI t |(first preset condition), the fourth reactive current margin of the energy storage system is determined according to the above step S3064. The calculation formula for reducing the active current of the energy storage is shown in the following formula (10):

[0127]

[0128] Among them, I BS,S is the rated current of the energy storage system.

[0129] Step b2, when the sum of the first reactive current margin, the second reactive current margin and the fourth reactive current margin is greater than or equal to the reactive current to be provided by the new energy power station, a third control instruction is generated, and the third control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

[0130] Step b3, when the sum of the first reactive current margin, the second reactive current margin and the fourth reactive current margin is less than the reactive current to be provided by the new energy power station, the active power of the new energy generator is controlled to meet the second preset condition to obtain the fifth reactive current margin of the new energy generator set.

[0131] Step b4, when the sum of the first reactive current margin, the fourth reactive current margin and the fifth reactive current margin is greater than or equal to the reactive current to be provided by the new energy power station, a fourth control instruction is generated, and the fourth control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

[0132] For example, in the embodiment of the present application, when the active power of the energy storage system drops to 0, it still cannot meet the requirements of I res ≥|ΔI t |(Second preset condition), at this time, it is necessary to reduce the active power of the wind farm and increase the total reactive power margin of the wind farm. res ≥|ΔI t |, provide a dynamic reactive current that meets the grid demand according to step S3064. The calculation formula for reducing the active current of the wind farm is shown in the following formula (11):

[0133]

[0134] Among them, I w,S is the rated current of the wind farm.

[0135] In this embodiment, a voltage support control device for power grid failure is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0136] This embodiment provides a voltage support control device when a power grid fails, such as Figure 4 As shown, including:

[0137] The acquisition module 401 is used to acquire the grid connection point voltage of the new energy power station, the reactive power of the reactive power compensation device, the active power of the new energy generator set and the active power of the energy storage system when a grid fault is detected;

[0138] A first determination module 402 is used to determine the reactive current to be provided by the new energy power station according to the voltage of the grid connection point of the new energy power station;

[0139] A second determining module 403, configured to determine a first reactive current margin of the reactive compensation device according to the reactive power of the reactive compensation device;

[0140] The third determination module 404 is used to determine a second reactive current margin of the new energy generator set according to the active power of the new energy generator set;

[0141] A fourth determination module 405, configured to determine a third reactive current margin of the energy storage system according to the active power of the energy storage system;

[0142] The instruction generation module 406 is used to generate a voltage control instruction based on the first reactive current margin, the second reactive current margin, the third reactive current margin and the reactive current to be provided by the new energy power station. The voltage control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

[0143] In some optional implementations, the acquisition module 401 includes:

[0144] The first acquisition submodule is used to obtain the measured voltage of the grid connection point and the rated voltage of the grid connection point of the new energy power station;

[0145] The judgment submodule is used to judge whether the power grid is faulty based on the measured voltage of the grid connection point of the new energy power station, the rated voltage of the grid connection point and the preset voltage fluctuation range, and obtain a judgment result.

[0146] In some optional implementations, the first determining module 402 includes:

[0147] The second acquisition submodule is used to obtain the rated current value of the grid connection point of the new energy power station;

[0148] The first determination submodule is used to determine the voltage per unit value of the grid connection point of the new energy power station based on the measured voltage of the grid connection point of the new energy power station and the rated voltage of the grid connection point;

[0149] The second determination submodule is used to determine the reactive current to be provided by the new energy power station based on the voltage per unit value of the energy power station grid connection point and the rated current value of the new energy power station grid connection point.

[0150] In some optional implementations, the second determining module includes:

[0151] A third acquisition submodule is used to obtain the rated capacity of the reactive power compensation device;

[0152] A third determination submodule is used to determine the reactive power margin of the reactive compensation device based on the rated capacity of the reactive compensation device, the reactive power of the reactive compensation device, and the reactive current to be provided by the new energy power station;

[0153] The fourth determination submodule is used to determine the first reactive current margin based on the reactive power margin of the reactive compensation device and the grid connection point voltage of the new energy power station.

[0154] In some optional implementations, the third determining module includes:

[0155] The fourth acquisition submodule is used to acquire the maximum apparent power corresponding to different generator sets respectively;

[0156] A fifth determination submodule, configured to determine a reactive power margin of a corresponding new energy generator set based on the active power and the maximum apparent power of each new energy generator set;

[0157] The sixth determination submodule is used to determine the total reactive power margin of different new energy generating sets;

[0158] The seventh determination submodule is used to determine the second reactive current margin based on the total reactive power margin of different renewable energy power generation groups and the grid connection point voltage of the renewable energy power station.

[0159] In some optional implementations, the energy storage system includes a plurality of energy storage inverters, and the fourth determination module includes:

[0160] The fifth acquisition submodule is used to obtain the active power and maximum apparent power output by each energy storage inverter in the energy storage system;

[0161] An eighth determination submodule, configured to determine a reactive power margin of a corresponding energy storage inverter based on the active power and the maximum apparent power output by each energy storage inverter;

[0162] A ninth determination submodule, used to determine the total reactive power margin of different energy storage inverters;

[0163] The tenth determination submodule is used to determine the third reactive current margin based on the total reactive power margin of different energy storage inverters and the grid connection point voltage of the new energy power station.

[0164] In some optional implementations, the instruction generation module includes:

[0165] A comparison submodule, used for comparing the reactive current to be provided by the new energy power station with the sum of the first reactive current margin and the third reactive current margin to obtain a comparison result;

[0166] An eleventh determination submodule is used to determine a first reactive current to be output by the reactive compensation device and a second reactive current to be output by the energy storage system when the reactive current to be provided by the new energy power station is less than or equal to the sum of the first reactive current margin and the third reactive current margin;

[0167] A first instruction generating submodule, used for generating a first control instruction according to the first reactive current to be output and the second reactive current to be output, the first control instruction being used for controlling the reactive compensation device and the energy storage system to provide reactive current to the power grid;

[0168] A twelfth determination submodule is used to determine the third reactive current to be output of the reactive compensation device, the fourth reactive current to be output of the energy storage system, and the fifth reactive current to be output of the new energy generator set when the reactive current to be provided by the new energy power station is greater than the sum of the first reactive current margin and the third reactive current margin;

[0169] The second instruction generation submodule is used to generate a second control instruction based on the third reactive current to be output, the fourth reactive current to be output and the fifth reactive current to be output, and the second control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

[0170] In some optional implementations, the instruction generation module further includes:

[0171] The first control submodule is used to control the active power of the energy storage system to be reduced to meet the first preset condition when the sum of the first reactive current margin, the second reactive current margin and the third reactive current margin is less than the reactive current to be provided by the new energy power station, so as to obtain a fourth reactive current margin of the energy storage system;

[0172] A third instruction generating submodule is used to generate a third control instruction when the sum of the first reactive current margin, the second reactive current margin and the fourth reactive current margin is greater than or equal to the reactive current to be provided by the new energy power station, and the third control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid;

[0173] The second control submodule is used for controlling the active power of the new energy generator to meet the second preset condition when the sum of the first reactive current margin, the second reactive current margin and the fourth reactive current margin is less than the reactive current to be provided by the new energy power station, so as to obtain the fifth reactive current margin of the new energy generator set;

[0174] The fourth instruction generation submodule generates a fourth control instruction when the sum of the first reactive current margin, the fourth reactive current margin and the fifth reactive current margin is greater than or equal to the reactive current to be provided by the new energy power station. The fourth control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

[0175] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0176] The voltage support control device during power grid failure in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0177] The embodiment of the present invention also provides a computer device having the above Figure 4 The voltage support control device in the event of a grid fault is shown.

[0178] See also Figure 5 , Figure 5 is a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, such as Figure 5 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 5 A processor 10 is taken as an example.

[0179] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0180] The memory 20 stores instructions executable by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0181] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0182] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0183] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0184] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0185] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A voltage support control method for power grid failure, characterized in that: The method comprises: When a grid fault is detected, the grid connection point voltage of the new energy power station, the reactive power of the reactive power compensation device, the active power of the new energy generator set and the active power of the energy storage system are obtained; Determine the reactive current to be provided by the new energy power station according to the voltage of the grid connection point of the new energy power station; Determining a first reactive current margin of the reactive compensation device according to the reactive power of the reactive compensation device; Determine a second reactive current margin of the new energy generator set according to the active power of the new energy generator set; Determining a third reactive current margin of the energy storage system according to the active power of the energy storage system; Generate a voltage control instruction according to the first reactive current margin, the second reactive current margin, the third reactive current margin and the reactive current to be provided by the new energy power station, wherein the voltage control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid; When a power grid fault is detected, before the step of obtaining the grid connection point voltage of the new energy power station, the reactive power of the reactive power compensation device, the active power of the new energy generator set and the active power of the energy storage system, the method further includes: Obtain the measured voltage and rated voltage of the grid connection point of the new energy power station; Determine whether the power grid is faulty based on the measured voltage of the grid connection point of the new energy power station, the rated voltage of the grid connection point, and a preset voltage fluctuation range, and obtain a determination result; The method comprises: determining the reactive current to be provided by the new energy power station according to the voltage of the grid connection point of the new energy power station; Obtain the rated current value of the grid connection point of the new energy power station; The voltage per unit value of the grid connection point of the new energy power station is determined based on the measured voltage of the grid connection point of the new energy power station and the rated voltage of the grid connection point. The voltage per unit value of the grid connection point of the new energy power station is expressed as U t express, U g Indicates the grid connection point voltage of the new energy power station, U N Indicates the rated voltage of the grid connection point; Determine the reactive current to be provided by the new energy power station based on the voltage per unit value of the energy power station grid connection point and the rated current value of the new energy power station grid connection point; The reactive current to be provided by the new energy power station is determined by the following formula: Among them, ΔI t is the reactive current to be provided by the new energy power station, K1 and K2 are the dynamic reactive current proportional coefficients, I N Indicates the rated current value of the grid connection point of the new energy power station; The step of determining a first reactive current margin of the reactive compensation device according to the reactive power of the reactive compensation device comprises: Obtaining the rated capacity of the reactive power compensation device; Determine the reactive power margin of the reactive compensation device based on the rated capacity of the reactive compensation device, the reactive power of the reactive compensation device, and the reactive current to be provided by the new energy power station; The reactive power margin of the reactive power compensation device is determined by the following formula: Among them, S svg is the rated capacity of the reactive power compensation device SVG, Q svg,r is the reactive power of the reactive power compensation device SVG, Q svg,res is the reactive power margin of the reactive power compensation device; Determining the first reactive current margin based on the reactive power margin of the reactive compensation device and the grid connection point voltage of the new energy power station; The first reactive current margin is calculated by the following formula: Among them, I svg,res is the first reactive current margin; The new energy power station includes a plurality of new energy generating sets, and the step of determining the second reactive current margin of the new energy generating set according to the active power of the new energy generating set includes: Obtain the maximum apparent power corresponding to different generator sets; Determine the reactive power margin of the corresponding new energy generator set based on the active power and maximum apparent power of each new energy generator set; The reactive power margin of the new energy generator set is calculated by the following formula: Among them, Q w,res,g represents the reactive power margin of the g-th generator set, P w,g represents the active power of the g-th generator set, S w,g represents the maximum apparent power of the g-th generator set; Determine the total reactive power margin of different renewable energy generating units; The total reactive power margin of the different new energy generating sets is determined by the following formula: Among them, Q w,res The total reactive power margin of different renewable energy generator sets, g is the identifier of the renewable energy generator set, and n is the number of renewable energy generator sets; Determining the second reactive current margin based on the total reactive power margin of the different new energy power generation groups and the grid connection point voltage of the new energy power station; The second reactive current margin is determined by the following formula: Among them, I w,res is the second reactive current margin; The energy storage system includes a plurality of energy storage inverters, and the step of determining the third reactive current margin of the energy storage system according to the active power of the energy storage system includes: Obtain the active power and maximum apparent power output by each energy storage inverter in the energy storage system; Determining the reactive power margin of the corresponding energy storage inverter based on the active power and the maximum apparent power output by each energy storage inverter; The reactive power margin of the energy storage inverter is determined by the following formula: Among them, Q BS,res,j is the reactive power margin of the jth energy storage inverter, S BS,j The maximum apparent power of the jth energy storage inverter, P BS,j represents the active power output by the jth energy storage inverter; Determine the total reactive power margin of different energy storage inverters; The total reactive power margin of the different energy storage inverters is determined by: Among them, Q BS,res is the total reactive power margin, m is the number of inverters in the energy storage system; Determining the third reactive current margin based on the total reactive power margin of the different energy storage inverters and the grid connection point voltage of the new energy power station; The third reactive current margin is determined by the following formula: Among them, I BS,res is the third reactive current margin; The step of generating a voltage control instruction according to the first reactive current margin, the second reactive current margin, the third reactive current margin and the reactive current to be provided by the new energy power station comprises: Comparing the reactive current to be provided by the new energy power station with the sum of the first reactive current margin and the third reactive current margin to obtain a comparison result; When the reactive current to be provided by the new energy power station is less than or equal to the sum of the first reactive current margin and the third reactive current margin, determining a first reactive current to be output by the reactive compensation device and a second reactive current to be output by the energy storage system; The first reactive current to be output by the reactive compensation device is determined by the following formula: Among them, I svg Indicates the reactive current to be output by the reactive compensation device; The second reactive current to be output of the energy storage system is determined by the following formula: I BS =ΔI t -I svg Among them, I BS Indicates the reactive current to be output by the energy storage system; Generate a first control instruction according to the first reactive current to be output and the second reactive current to be output, wherein the first control instruction is used to control the reactive compensation device and the energy storage system to provide reactive current to the power grid; When the reactive current to be provided by the new energy power station is greater than the sum of the first reactive current margin and the third reactive current margin, determining the third reactive current to be output by the reactive compensation device, the fourth reactive current to be output by the energy storage system, and the fifth reactive current to be output by the new energy generator set; The third reactive current to be outputted by the reactive compensation device is determined by the following formula: The fourth reactive current to be output of the energy storage system is determined by the following formula: The fifth reactive current to be output by the new energy generator set is determined by the following formula: I w =ΔI t -I svg -I BS Among them, I w Indicates the fifth output reactive current of the new energy generator set; Generate a second control instruction based on the third reactive current to be output, the fourth reactive current to be output, and the fifth reactive current to be output, wherein the second control instruction is used to control the reactive compensation device, the new energy generator set, and the energy storage system to provide reactive current to the power grid; The step of generating a voltage control instruction according to the first reactive current margin, the second reactive current margin, the third reactive current margin and the reactive current to be provided by the new energy power station also includes: When the sum of the first reactive current margin, the second reactive current margin and the third reactive current margin is less than the reactive current to be provided by the new energy power station, the active power of the energy storage system is controlled to be reduced to meet the first preset condition, so as to obtain a fourth reactive current margin of the energy storage system; The first preset condition is to reduce the active power of the energy storage system to I res ≥|ΔI t |, the active current to reduce energy storage is calculated by the following formula: Among them, I BS,S is the rated current of the energy storage system; When the active power of the energy storage system drops to 0, the second preset condition I is still not met. res ≥|ΔI t |, reduce the active power of the wind farm and increase the total reactive power margin of the wind farm. When the active power of the wind farm is reduced to I res ≥|ΔI t |, the active current of the wind farm can be reduced by the following formula: Among them, I w,S is the rated current of the wind farm; When the sum of the first reactive current margin, the second reactive current margin and the fourth reactive current margin is greater than or equal to the reactive current to be provided by the new energy power station, a third control instruction is generated, and the third control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid; When the sum of the first reactive current margin, the second reactive current margin and the fourth reactive current margin is less than the reactive current to be provided by the new energy power station, the active power of the new energy generator is controlled to meet the second preset condition, so as to obtain the fifth reactive current margin of the new energy generator set; When the sum of the first reactive current margin, the fourth reactive current margin and the fifth reactive current margin is greater than or equal to the reactive current to be provided by the new energy power station, a fourth control instruction is generated, and the fourth control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

2. A voltage support control device for power grid failure, characterized in that: For executing the method according to claim 1, the device comprises: An acquisition module is used to acquire the grid connection point voltage of the new energy power station, the reactive power of the reactive compensation device, the active power of the new energy generator set, and the active power of the energy storage system when a grid fault is detected; A first determination module, used to determine the reactive current to be provided by the new energy power station according to the voltage of the grid connection point of the new energy power station; A second determining module, configured to determine a first reactive current margin of the reactive compensation device according to the reactive power of the reactive compensation device; A third determination module is used to determine a second reactive current margin of the new energy generator set according to the active power of the new energy generator set; A fourth determination module, used to determine a third reactive current margin of the energy storage system according to the active power of the energy storage system; An instruction generation module is used to generate a voltage control instruction based on the first reactive current margin, the second reactive current margin, the third reactive current margin and the reactive current to be provided by the new energy power station, and the voltage control instruction is used to control the reactive compensation device, the new energy generator set and the energy storage system to provide reactive current to the power grid.

3. The device according to claim 2, characterized in that The acquisition module comprises: The first acquisition submodule is used to obtain the measured voltage of the grid connection point and the rated voltage of the grid connection point of the new energy power station; The judgment submodule is used to judge whether the power grid is faulty based on the measured voltage of the grid connection point of the new energy power station, the rated voltage of the grid connection point and the preset voltage fluctuation range, and obtain a judgment result.

4. The device according to claim 3, characterized in that The first determining module comprises: The second acquisition submodule is used to obtain the rated current value of the grid connection point of the new energy power station; A first determination submodule, configured to determine a per unit voltage value of a new energy power station grid connection point based on a measured voltage of the grid connection point of the new energy power station and a rated voltage of the grid connection point; The second determination submodule is used to determine the reactive current to be provided by the new energy power station based on the voltage per unit value of the energy power station grid connection point and the rated current value of the new energy power station grid connection point.

5. The device according to claim 2, characterized in that The second determining module comprises: A third acquisition submodule is used to obtain the rated capacity of the reactive power compensation device; A third determination submodule is used to determine the reactive power margin of the reactive compensation device based on the rated capacity of the reactive compensation device, the reactive power of the reactive compensation device, and the reactive current to be provided by the new energy power station; The fourth determination submodule is used to determine the first reactive current margin based on the reactive power margin of the reactive compensation device and the grid connection point voltage of the new energy power station.

6. The device according to claim 2, characterized in that The third determination module comprises: The fourth acquisition submodule is used to acquire the maximum apparent power corresponding to different generator sets respectively; A fifth determination submodule, configured to determine a reactive power margin of a corresponding new energy generator set based on the active power and the maximum apparent power of each new energy generator set; The sixth determination submodule is used to determine the total reactive power margin of different new energy generating sets; The seventh determination submodule is used to determine the second reactive current margin based on the total reactive power margin of the different new energy power generation groups and the grid connection point voltage of the new energy power station.

7. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the voltage support control method during power grid fault as described in claim 1 by executing the computer instructions.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the voltage support control method during power grid fault according to claim 1.

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