A control method, device and electronic equipment for a wind turbine generator set

Abstract

The present application provides a control method for a wind turbine generator set, the method comprising: obtaining an initial three-phase line voltage at the grid connection point of the wind turbine generator set; obtaining a target sampling frequency, and continuing sampling according to the target sampling frequency to obtain at least one three-phase line voltage; obtaining a target maximum grid line voltage amplitude based on the initial three-phase line voltage and the three-phase line voltage; and adjusting a DC bus voltage setting value based on the target maximum grid line voltage amplitude. The present application can quickly and accurately detect the amplitude of the grid line voltage, thereby determining whether the wind turbine generator set needs to enter a high voltage ride-through state. It can also nonlinearly and dynamically adjust the converter DC bus voltage setting value, solving the problem of grid-side converter shutdown due to overmodulation faults.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation, and in particular to a control method, device and electronic equipment for a wind turbine generator set. Background Art

[0002] Wind turbines are currently widely used in power generation. To ensure the safety and reliability of power systems, relevant regulations (standards) have set specific requirements for wind turbines' high voltage ride-through (HVRT) capabilities. However, existing technologies for achieving HVRT capabilities are unable to quickly and accurately detect the grid line voltage amplitude and dynamically adjust the converter's DC bus voltage setpoint.

[0003] Therefore, how to quickly and accurately detect the grid line voltage amplitude and dynamically adjust the converter DC bus voltage setting value to achieve the high voltage ride-through capability of the wind turbine has become an urgent problem to be solved. Summary of the Invention

[0004] The present application provides a control method for a wind turbine generator set, which can quickly and accurately detect the amplitude of the grid line voltage, and then determine whether the wind turbine generator set needs to enter a high voltage ride-through state. At the same time, it can nonlinearly and dynamically adjust the converter DC bus voltage setting value, solving the problem of shutdown due to overmodulation failure of the grid-side converter.

[0005] According to the first aspect of the present application, a control method for a wind turbine is provided, including: obtaining an initial three-phase line voltage at a grid-connected point of the wind turbine; obtaining a target sampling frequency, and continuing sampling according to the target sampling frequency to obtain at least one three-phase line voltage; obtaining a target maximum grid line voltage amplitude based on the initial three-phase line voltage and the three-phase line voltage; and adjusting a DC bus voltage set value based on the target maximum grid line voltage amplitude.

[0006] In addition, the control method of a wind turbine generator system according to the above embodiment of the present application may also have the following additional technical features:

[0007] According to one embodiment of the present application, the method of obtaining the maximum amplitude of the target grid line voltage based on the initial three-phase line voltage and the three-phase line voltage includes: obtaining the initial first two-phase line voltage based on the initial three-phase line voltage, and obtaining the first two-phase line voltage based on the three-phase line voltage; using the initial first two-phase line voltage as the maximum amplitude of the initial grid line voltage, and judging whether the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage; if it is determined that the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage, then using the negative value of the first two-phase line voltage as the maximum amplitude of the target grid line voltage.

[0008] According to one embodiment of the present application, after judging whether the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage, it also includes: determining that the maximum amplitude of the initial grid line voltage is greater than the negative value of the first two-phase line voltage, obtaining the initial second two-phase line voltage based on the initial three-phase line voltage, and obtaining the second two-phase line voltage based on the three-phase line voltage; judging whether the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage; determining that the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage, then using the initial second two-phase line voltage as the target grid line voltage maximum amplitude.

[0009] According to one embodiment of the present application, after determining whether the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage, it also includes: determining that the maximum amplitude of the initial grid line voltage is greater than the initial second two-phase line voltage, then determining whether the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage; determining that the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage, then using the negative value of the second two-phase line voltage as the target grid line voltage maximum amplitude.

[0010] According to one embodiment of the present application, after judging whether the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage, it also includes: determining that the maximum amplitude of the initial grid line voltage is greater than the negative value of the second two-phase line voltage, obtaining the initial third two-phase line voltage based on the initial three-phase line voltage, and obtaining the third two-phase line voltage based on the three-phase line voltage; judging whether the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage; determining that the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage, then using the initial third two-phase line voltage as the target grid line voltage maximum amplitude.

[0011] According to one embodiment of the present application, after determining whether the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage, it also includes: determining that the maximum amplitude of the initial grid line voltage is greater than the initial third two-phase line voltage, then determining whether the maximum amplitude of the initial grid line voltage is less than the negative value of the third two-phase line voltage; determining that the maximum amplitude of the initial grid line voltage is less than the negative value of the third two-phase line voltage, then using the negative value of the third two-phase line voltage as the target maximum amplitude of the grid line voltage.

[0012] According to one embodiment of the present application, the DC bus voltage setting value is adjusted according to the target grid line voltage maximum amplitude, including: obtaining a standard line voltage amplitude and a first target ratio, and obtaining a first target standard line voltage amplitude according to the standard line voltage amplitude and the first target ratio; judging whether the target grid line voltage maximum amplitude is greater than the first target standard line voltage amplitude; if it is determined that the target grid line voltage maximum amplitude is greater than the first target standard line voltage amplitude, then using a preset voltage setting value as the DC bus voltage setting value.

[0013] According to one embodiment of the present application, after determining whether the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude, it also includes: determining that the maximum amplitude of the target grid line voltage is less than or equal to the first target standard line voltage amplitude, obtaining a second target ratio, and obtaining a second target standard line voltage amplitude based on the second target ratio and the standard line voltage amplitude; determining whether the maximum amplitude of the target grid line voltage is greater than the second target standard line voltage amplitude; determining that the maximum amplitude of the target grid line voltage is greater than the second target standard line voltage amplitude, obtaining a first adjustment parameter, and adjusting the DC bus voltage set value based on the first adjustment parameter.

[0014] According to one embodiment of the present application, after determining whether the maximum amplitude of the target grid line voltage is greater than the second target standard line voltage amplitude, it also includes: determining that the maximum amplitude of the target grid line voltage is less than or equal to the second target standard line voltage amplitude, obtaining a third target ratio, and obtaining a third target standard line voltage amplitude based on the third target ratio and the standard line voltage amplitude; determining whether the maximum amplitude of the target grid line voltage is greater than the third target standard line voltage amplitude; determining that the maximum amplitude of the target grid line voltage is greater than the third target standard line voltage amplitude, obtaining a second adjustment parameter, and adjusting the DC bus voltage set value based on the second adjustment parameter.

[0015] According to one embodiment of the present application, the method further includes: obtaining the current voltage per unit value, the current system frequency and the grid-side reactor inductance; and determining the grid-side converter reactive current output setting value based on the current voltage per unit value, the current system frequency and the grid-side reactor inductance.

[0016] According to one embodiment of the present application, the method further includes: obtaining a fourth target ratio, and obtaining a fourth target standard line voltage amplitude based on the fourth target ratio and the standard line voltage amplitude; determining that the maximum amplitude of the target grid line voltage is greater than the fourth target standard line voltage amplitude, then determining that the wind turbine enters the high voltage ride-through state.

[0017] According to an embodiment of the present application, after determining that the wind turbine generator set enters the high voltage ride-through state, the method further includes: setting a high voltage ride-through flag.

[0018] According to the second aspect of the present application, a control device for a wind turbine is provided, including: a first acquisition module, used to obtain the initial three-phase line voltage of the grid-connected point of the wind turbine; a second acquisition module, used to obtain a target sampling frequency, and continue sampling according to the target sampling frequency to obtain at least one three-phase line voltage; a third acquisition module, used to obtain a target grid line voltage maximum amplitude based on the initial three-phase line voltage and the three-phase line voltage; an adjustment module, used to adjust the DC bus voltage set value according to the target grid line voltage maximum amplitude.

[0019] According to the above embodiment of the present application, a control device for a wind turbine generator system may further have the following additional technical features:

[0020] According to one embodiment of the present application, the third acquisition module is also used to: obtain the initial first two-phase line voltage based on the initial three-phase line voltage, and obtain the first two-phase line voltage based on the three-phase line voltage; use the initial first two-phase line voltage as the maximum amplitude of the initial grid line voltage, and determine whether the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage; if it is determined that the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage, then use the negative value of the first two-phase line voltage as the maximum amplitude of the target grid line voltage.

[0021] According to one embodiment of the present application, the third acquisition module is also used to: determine that the maximum amplitude of the initial grid line voltage is greater than the negative value of the first two-phase line voltage, then obtain the initial second two-phase line voltage based on the initial three-phase line voltage, and obtain the second two-phase line voltage based on the three-phase line voltage; judge whether the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage; determine that the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage, then use the initial second two-phase line voltage as the target grid line voltage maximum amplitude.

[0022] According to one embodiment of the present application, the third acquisition module is also used to: determine that the maximum amplitude of the initial grid line voltage is greater than the initial second two-phase line voltage, then judge whether the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage; determine that the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage, then use the negative value of the second two-phase line voltage as the target grid line voltage maximum amplitude.

[0023] According to one embodiment of the present application, the third acquisition module is also used to: determine that the maximum amplitude of the initial grid line voltage is greater than the negative value of the second two-phase line voltage, then obtain the initial third two-phase line voltage based on the initial three-phase line voltage, and obtain the third two-phase line voltage based on the three-phase line voltage; judge whether the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage; determine that the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage, then use the initial third two-phase line voltage as the target grid line voltage maximum amplitude.

[0024] According to one embodiment of the present application, the third acquisition module is also used to: determine that the maximum amplitude of the initial grid line voltage is greater than the initial third two-phase line voltage, then judge whether the maximum amplitude of the initial grid line voltage is less than the negative value of the third two-phase line voltage; determine that the maximum amplitude of the initial grid line voltage is less than the negative value of the third two-phase line voltage, then use the negative value of the third two-phase line voltage as the target grid line voltage maximum amplitude.

[0025] According to one embodiment of the present application, the adjustment module is further used to: obtain the standard line voltage amplitude and the first target ratio, and obtain the first target standard line voltage amplitude based on the standard line voltage amplitude and the first target ratio; determine whether the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude; if it is determined that the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude, then use the preset voltage setting value as the DC bus voltage setting value.

[0026] According to one embodiment of the present application, the adjustment module is further used to: determine that the maximum amplitude of the target grid line voltage is less than or equal to the first target standard line voltage amplitude, then obtain a second target ratio, and obtain a second target standard line voltage amplitude based on the second target ratio and the standard line voltage amplitude; judge whether the maximum amplitude of the target grid line voltage is greater than the second target standard line voltage amplitude; determine that the maximum amplitude of the target grid line voltage is greater than the second target standard line voltage amplitude, then obtain a first adjustment parameter, and adjust the DC bus voltage set value based on the first adjustment parameter.

[0027] According to one embodiment of the present application, the adjustment module is further used to: determine whether the maximum amplitude of the target grid line voltage is less than or equal to the second target standard line voltage amplitude, obtain a third target ratio, and obtain a third target standard line voltage amplitude based on the third target ratio and the standard line voltage amplitude; determine whether the maximum amplitude of the target grid line voltage is greater than the third target standard line voltage amplitude; if it is determined that the maximum amplitude of the target grid line voltage is greater than the third target standard line voltage amplitude, obtain a second adjustment parameter, and adjust the DC bus voltage set value based on the second adjustment parameter.

[0028] According to one embodiment of the present application, the device is also used to: obtain the current voltage per unit value, the current system frequency and the grid-side inductance; and determine the grid-side converter reactive current output setting value based on the current voltage per unit value, the current system frequency and the grid-side inductance.

[0029] According to one embodiment of the present application, the device is also used to: obtain a fourth target ratio, and obtain a fourth target standard line voltage amplitude based on the fourth target ratio and the standard line voltage amplitude; determine that the maximum amplitude of the target grid line voltage is greater than the fourth target standard line voltage amplitude, then determine that the wind turbine enters the high voltage ride-through state.

[0030] According to one embodiment of the present application, the apparatus is further configured to: set a high voltage ride-through flag.

[0031] In order to achieve the above-mentioned purpose, the third aspect of the present application proposes an electronic device, characterized in that it includes: a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the program, it implements the control method of the wind turbine group as described in the first aspect.

[0032] In order to achieve the above-mentioned purpose, the fourth aspect of the present application proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable the computer to execute the wind turbine control method described in the first aspect.

[0033] In order to achieve the above-mentioned purpose, the fifth aspect of the present application proposes a computer program product, including a computer program, which implements the control method of the wind turbine generator system according to the first aspect when executed by a processor.

[0034] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0035] The present application provides a control method for a wind turbine generator set, which can quickly and accurately detect the amplitude of the grid line voltage, and then determine whether the wind turbine generator set needs to enter a high voltage ride-through state. At the same time, it can nonlinearly and dynamically adjust the DC bus voltage setting value of the converter, solving the problem of shutdown due to overmodulation failure of the grid-side converter.

[0036] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are provided to facilitate a better understanding of the present invention and do not constitute a limitation of the present application.

[0038] Figure 1 A flow chart of a control method for a wind turbine generator system provided in an embodiment of the present application;

[0039] Figure 2 A flow chart of another wind turbine control method provided in an embodiment of the present application;

[0040] Figure 3 A flow chart of another wind turbine control method provided in an embodiment of the present application;

[0041] Figure 4 A flow chart of another wind turbine control method provided in an embodiment of the present application;

[0042] Figure 5 A flow chart of another wind turbine control method provided in an embodiment of the present application;

[0043] Figure 6 A flow chart of another wind turbine control method provided in an embodiment of the present application;

[0044] Figure 7 A flow chart of another wind turbine control method provided in an embodiment of the present application;

[0045] Figure 8 A flow chart of another wind turbine control method provided in an embodiment of the present application;

[0046] Figure 9 A flow chart of another wind turbine control method provided in an embodiment of the present application;

[0047] Figure 10 A flow chart of another wind turbine control method provided in an embodiment of the present application;

[0048] Figure 11A flow chart of another wind turbine control method provided in an embodiment of the present application;

[0049] Figure 12 A flow chart of a method for obtaining grid line voltage amplitude provided in an embodiment of the present application;

[0050] Figure 13 A flowchart of a method for adjusting a DC bus voltage setting value of a converter provided in an embodiment of the present application;

[0051] Figure 14 A flow chart of a method for achieving high voltage ride-through capability of a wind turbine generator system provided in an embodiment of the present application;

[0052] Figure 15 A schematic structural diagram of a control device for a wind turbine generator system provided in an embodiment of the present application;

[0053] Figure 16 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] The following description of exemplary embodiments of the present application is made in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0055] The control method of the wind turbine generator system of the present application is described in detail below using embodiments.

[0056] Figure 1 A flow chart of a wind turbine control method according to an embodiment of the present invention.

[0057] like Figure 1 As shown, the control method of the wind turbine generator system proposed in this embodiment specifically includes the following steps:

[0058] S101: Obtain the initial three-phase line voltage of the grid connection point of the wind turbine generator.

[0059] It should be noted that the wind turbine converter can be divided into a grid-side converter and a generator-side converter in terms of topology, wherein the grid-side converter can be equivalent to a three-phase boost circuit.

[0060] It should be noted that when obtaining the initial three-phase line voltage of the wind turbine grid connection point, the initial three-phase line voltage of the wind turbine grid connection point can be directly measured to obtain the initial three-phase line voltage of the wind turbine grid connection point.

[0061] Among them, line voltage refers to the voltage between two phase (line) conductors at a given point in a multi-phase AC circuit.

[0062] S102: Obtain a target sampling frequency, and continue sampling according to the target sampling frequency to obtain at least one three-phase line voltage.

[0063] It should be noted that the setting of the target sampling frequency is not limited in this application and can be selected according to actual conditions.

[0064] Optionally, the target sampling frequency may be set to 1000 times / second.

[0065] In an embodiment of the present application, after the target sampling frequency is obtained, sampling can be continued according to the target sampling frequency to obtain at least one three-phase line voltage.

[0066] Furthermore, after obtaining at least one three-phase line voltage, the three-phase line voltage at the wind turbine grid connection point may be output to the grid-side converter of the wind turbine, and the current three-phase line voltage sampling value may be stored.

[0067] S103 : Obtain a maximum value of the target grid line voltage according to the initial three-phase line voltage and the three-phase line voltage.

[0068] In an embodiment of the present application, after obtaining the initial three-phase line voltage and the three-phase line voltage, the maximum value of the target grid line voltage can be obtained based on the magnitude relationship between the initial three-phase line voltage and different three-phase line voltages.

[0069] S104: Adjust the DC bus voltage setting value according to the target maximum grid line voltage.

[0070] It should be noted that after the target maximum grid line voltage amplitude is obtained, the DC bus voltage setting value can be adjusted according to the maximum grid line voltage amplitude.

[0071] For example, different proportional coefficients can be set to dynamically adjust the DC bus voltage setting value.

[0072] The wind turbine control method provided in this application obtains the initial three-phase line voltage at the wind turbine's grid connection point, obtains a target sampling frequency, and continues sampling according to the target sampling frequency to obtain at least one three-phase line voltage. Based on the initial three-phase line voltage and the three-phase line voltage, the target maximum grid line voltage amplitude is obtained. Based on the target maximum grid line voltage amplitude, the DC bus voltage set value is adjusted. Thus, the application can quickly and accurately detect the amplitude of the grid line voltage, thereby determining whether the wind turbine needs to enter a high voltage ride-through state. Simultaneously, the converter DC bus voltage set value can be nonlinearly and dynamically adjusted, solving the problem of grid-side converter shutdown due to overmodulation faults.

[0073] In an embodiment of the present application, when attempting to obtain the voltage threshold corresponding to the low voltage ride-through state, the first two-phase line voltage and the negative value of the first two-phase line voltage can be obtained, and the magnitude of the first two-phase line voltage and the negative value of the first two-phase line voltage can be judged, thereby determining the maximum amplitude of the target grid line voltage.

[0074] As a possible implementation, Figure 2 As shown, based on the above steps, the specific process of obtaining the maximum amplitude of the target grid line voltage according to the initial three-phase line voltage and the three-phase line voltage in step S103 includes the following steps:

[0075] S201 : Obtain an initial first two-phase line voltage according to an initial three-phase line voltage, and obtain a first two-phase line voltage according to the three-phase line voltage.

[0076] In the embodiment of the present application, after the initial three-phase line voltage is obtained, the initial first two-phase line voltage can be obtained based on the initial three-phase line voltage.

[0077] For example, after the initial ABC three-phase line voltage is obtained, the initial first AB two-phase line voltage can be obtained according to the initial ABC three-phase line voltage.

[0078] Furthermore, the first two-phase line voltage may be obtained according to the three-phase line voltage.

[0079] S202: Taking the initial first two-phase line voltage as the maximum amplitude of the initial grid line voltage, and determining whether the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage.

[0080] In the embodiment of the present application, after the initial first two-phase voltage is obtained, the initial first two-phase line voltage can be used as the maximum amplitude of the initial grid line voltage.

[0081] For example, after obtaining the first AB two-phase line voltage, the sampled value of the first AB two-phase line voltage may be assigned to the initial grid line voltage maximum amplitude up to obtain the initial grid line voltage maximum amplitude.

[0082] S203: Determine if the maximum amplitude of the initial grid line voltage is smaller than the negative value of the first two-phase line voltage, and use the negative value of the first two-phase line voltage as the maximum amplitude of the target grid line voltage.

[0083] For example, when it is determined that the initial maximum grid line voltage amplitude up is smaller than the negative value of the first AB two-phase line voltage, the negative value of the first AB two-phase line voltage is directly used as the target maximum grid line voltage amplitude.

[0084] Further, when it is determined that the maximum amplitude of the initial grid line voltage is greater than the negative value of the first two-phase line voltage, the initial second two-phase line voltage is obtained according to the initial three-phase line voltage, and the second two-phase line voltage is obtained according to the three-phase line voltage.

[0085] As a possible implementation, Figure 3 As shown, based on the above steps, the specific process after determining whether the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage in step S202 includes the following steps:

[0086] S301. Determine that the maximum amplitude of the initial grid line voltage is greater than the negative value of the first two-phase line voltage, obtain the initial second two-phase line voltage based on the initial three-phase line voltage, and obtain the second two-phase line voltage based on the three-phase line voltage.

[0087] It should be noted that after obtaining the maximum amplitude of the initial grid line voltage and the negative value of the first two-phase line voltage, the maximum amplitude up of the initial grid line voltage can be compared with the negative value of the first AB two-phase line voltage.

[0088] For example, if it is determined that the maximum amplitude up of the initial grid line voltage is greater than the negative value of the first AB two-phase line voltage, the initial second BC two-phase line voltage is obtained according to the initial ABC three-phase line voltage, and the second two-phase line voltage is obtained according to the three-phase line voltage.

[0089] S302: Determine whether the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage.

[0090] In the embodiment of the present application, after obtaining the initial grid line voltage maximum amplitude up and the initial second BC two-phase line voltage, it can be determined whether the initial grid line voltage maximum amplitude is smaller than the initial second two-phase line voltage.

[0091] S303: Determine that the maximum amplitude of the initial grid line voltage is smaller than the initial second two-phase line voltage, and use the initial second two-phase line voltage as the maximum amplitude of the target grid line voltage.

[0092] It should be noted that when it is determined that the initial grid line voltage maximum amplitude up is less than the initial second BC two-phase line voltage, the sampling value of the initial second BC phase line voltage is directly assigned to the grid line voltage maximum amplitude up, that is, the initial second two-phase line voltage is used as the target grid line voltage maximum amplitude up.

[0093] Further, when the maximum amplitude of the initial grid line voltage is greater than the initial second two-phase line voltage, it is determined whether the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage.

[0094] As a possible implementation, Figure 4 As shown, based on the above steps, the specific process after determining whether the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage in step S302 includes the following steps:

[0095] S401: Determine if the maximum amplitude of the initial grid line voltage is greater than the initial second two-phase line voltage, and then determine whether the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage.

[0096] For example, when the initial grid line voltage maximum amplitude up is greater than the initial second BC two-phase line voltage, it is determined whether the initial grid line voltage maximum amplitude is less than the negative value of the second two-phase line voltage, and the target grid line voltage maximum amplitude is obtained based on the size relationship between the initial grid line voltage maximum amplitude and the negative value of the second two-phase line voltage.

[0097] S402: Determine if the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage, and use the negative value of the second two-phase line voltage as the maximum amplitude of the target grid line voltage.

[0098] For example, when the initial grid line voltage maximum amplitude up is less than the negative value of the second BC two-phase line voltage, the negative value of the second BC two-phase line voltage sampling value is directly assigned to the grid line voltage maximum amplitude up, which is the target grid line voltage maximum amplitude.

[0099] Furthermore, when the maximum amplitude of the initial grid line voltage is a negative value greater than the second two-phase line voltage, the initial third two-phase line voltage is obtained based on the initial three-phase line voltage, and the third two-phase line voltage is obtained based on the three-phase line voltage, and when the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage, the initial third two-phase line voltage is used as the target grid line voltage maximum amplitude.

[0100] As a possible implementation, Figure 5 As shown, based on the above steps, in the above step S401, it is determined that the maximum amplitude of the initial grid line voltage is greater than the initial second two-phase line voltage, and then the specific process after determining whether the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage includes the following steps:

[0101] S501. Determine that the maximum amplitude of the initial grid line voltage is greater than the negative value of the second two-phase line voltage, obtain the initial third two-phase line voltage based on the initial three-phase line voltage, and obtain the third two-phase line voltage based on the three-phase line voltage.

[0102] It should be noted that after obtaining the maximum amplitude of the initial grid line voltage and the negative value of the second two-phase line voltage, the maximum amplitude of the initial grid line voltage up can be compared with the negative value of the second BC two-phase line voltage.

[0103] For example, if it is determined that the maximum amplitude up of the initial grid line voltage is greater than the negative value of the second two-phase line voltage, the initial third CA two-phase line voltage is obtained according to the initial ABC three-phase line voltage, and the third two-phase line voltage is obtained according to the three-phase line voltage.

[0104] S502: Determine whether the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage.

[0105] In the embodiment of the present application, after obtaining the maximum amplitude up of the initial grid line voltage and the initial third CA two-phase line voltage, it can be determined whether the maximum amplitude up of the initial grid line voltage is less than the initial third CA two-phase line voltage.

[0106] S503: Determine that the maximum amplitude of the initial grid line voltage is smaller than the initial third two-phase line voltage, and use the initial third two-phase line voltage as the target grid line voltage maximum amplitude.

[0107] For example, when it is determined that the initial grid line voltage maximum amplitude up is less than the initial third CA two-phase line voltage, the sampling value of the initial third CA phase line voltage is directly assigned to the grid line voltage maximum amplitude up, that is, the initial third CA phase line voltage is used as the target grid line voltage maximum amplitude up.

[0108] Further, when the maximum amplitude of the initial grid line voltage is smaller than the initial third two-phase line voltage, it is determined whether the maximum amplitude of the initial grid line voltage is smaller than the negative value of the third two-phase line voltage.

[0109] As a possible implementation, Figure 6 As shown, based on the above steps, the specific process after determining whether the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage in step S502 includes the following steps:

[0110] S601: Determine if the maximum amplitude of the initial grid line voltage is greater than the initial third two-phase line voltage, and then determine whether the maximum amplitude of the initial grid line voltage is less than the negative value of the third two-phase line voltage.

[0111] For example, when the initial grid line voltage maximum amplitude up is greater than the initial third CA two-phase line voltage, it is determined whether the initial grid line voltage maximum amplitude is less than the negative value of the third two-phase line voltage, and the target grid line voltage maximum amplitude is obtained based on the size relationship between the initial grid line voltage maximum amplitude and the negative value of the third two-phase line voltage.

[0112] S602: Determine if the maximum amplitude of the initial grid line voltage is less than the negative value of the third two-phase line voltage, and use the negative value of the third two-phase line voltage as the maximum amplitude of the target grid line voltage.

[0113] For example, when the initial grid line voltage maximum amplitude up is less than the negative value of the third CA two-phase line voltage, the negative value of the third CA two-phase line voltage sampling value is directly assigned to the grid line voltage maximum amplitude up, which is the target grid line voltage maximum amplitude.

[0114] In the embodiment of the present application, after the maximum amplitude of the target grid line voltage is obtained, the DC bus voltage setting value can be adjusted according to the maximum amplitude of the target grid line voltage.

[0115] It should be noted that when the wind turbine is operating normally, the DC bus voltage setting value Udc = Kp*up / Kdc, where Kp is the adjustment coefficient 1, Kdc is the bus utilization coefficient, the default values ​​of Kp are 1.0, and the default values ​​of Kdc are 0.98.

[0116] The following explains the specific process of adjusting the DC bus voltage setting value according to the target maximum grid line voltage value.

[0117] As a possible implementation, Figure 7 As shown, based on the above steps, the specific process of adjusting the DC bus voltage setting value according to the target grid line voltage maximum value in step S104 includes the following steps:

[0118] S701: Acquire a standard line voltage amplitude and a first target ratio, and acquire a first target standard line voltage amplitude according to the standard line voltage amplitude and the first target ratio.

[0119] It should be noted that the specific method for obtaining the standard line voltage amplitude is not limited in this application and can be selected according to actual conditions.

[0120] As a possible implementation method, the standard line voltage amplitude can be obtained by obtaining the attribute information of the wind turbine.

[0121] It should be noted that the setting of the first target ratio is not limited in this application and can be selected according to actual conditions.

[0122] Optionally, the first target ratio may be set to 120%.

[0123] S702: Determine whether the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude.

[0124] As a possible implementation, Figure 8 As shown, based on the above steps, the specific process after determining whether the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude in the above step S702 includes the following steps:

[0125] S801: If it is determined that the maximum amplitude of the target grid line voltage is less than or equal to the first target standard line voltage amplitude, a second target ratio is obtained, and a second target standard line voltage amplitude is obtained based on the second target ratio and the standard line voltage amplitude.

[0126] In an embodiment of the present application, when the target grid line voltage maximum amplitude is less than or equal to the first target standard line voltage amplitude, the second target ratio is obtained.

[0127] It should be noted that the setting of the second target ratio is not limited in this application and can be selected according to actual conditions.

[0128] Optionally, the second target ratio may be set to 115%.

[0129] Further, after the second target ratio and the standard line voltage amplitude are obtained, the second target standard line voltage amplitude may be obtained.

[0130] S802: Determine whether the maximum amplitude of the target grid line voltage is greater than the second target standard line voltage amplitude.

[0131] As a possible implementation, Figure 9 As shown, based on the above steps, the specific process after determining whether the maximum amplitude of the target grid line voltage is greater than the second target standard line voltage amplitude in step S802 includes the following steps:

[0132] S901. Determine whether the maximum amplitude of the target grid line voltage is less than or equal to the second target standard line voltage amplitude, obtain a third target ratio, and obtain a third target standard line voltage amplitude based on the third target ratio and the standard line voltage amplitude.

[0133] In an embodiment of the present application, when the target grid line voltage maximum amplitude is less than or equal to the second target standard line voltage amplitude, the third target ratio is obtained.

[0134] It should be noted that the setting of the third target ratio is not limited in this application and can be selected according to actual conditions.

[0135] Optionally, the third target ratio may be set to 110%.

[0136] Further, after the third target ratio and the standard line voltage amplitude are obtained, a third target standard line voltage amplitude may be obtained.

[0137] S902: Determine whether the maximum amplitude of the target grid line voltage is greater than the third target standard line voltage amplitude.

[0138] In an embodiment of the present application, after obtaining the target grid line voltage maximum amplitude and the third target standard line voltage amplitude, it can be determined whether the target grid line voltage maximum amplitude is greater than the third target standard line voltage amplitude.

[0139] S903: Determine that the maximum amplitude of the target grid line voltage is greater than the third target standard line voltage amplitude, obtain a second adjustment parameter, and adjust the DC bus voltage set value based on the second adjustment parameter.

[0140] It should be noted that the present application does not limit the setting of the second adjustment parameter, and it can be selected according to actual conditions.

[0141] Optionally, the second adjustment parameter may be set to 1.15*1.414.

[0142] Furthermore, after the second adjustment parameter is obtained, the DC bus voltage setting value may be adjusted according to the second adjustment parameter.

[0143] For example, when the second adjustment parameter is 1.15*1.414 and the DC bus voltage setting value is 690V, the DC bus voltage setting value can be adjusted according to the second adjustment parameter, that is, the adjusted DC bus voltage setting value Udc3=6901.15*1.414.

[0144] S803: If it is determined that the maximum amplitude of the target grid line voltage is greater than the second target standard line voltage amplitude, a first adjustment parameter is obtained, and the DC bus voltage set value is adjusted according to the first adjustment parameter.

[0145] In an embodiment of the present application, when the maximum amplitude of the target grid line voltage is greater than the second target standard line voltage amplitude, the first adjustment parameter is obtained.

[0146] It should be noted that the present application does not limit the setting of the first adjustment parameter, and it can be selected according to actual conditions.

[0147] Optionally, the first adjustment parameter may be set to 1.2*1.414.

[0148] Furthermore, after the first adjustment parameter is obtained, the DC bus voltage setting value may be adjusted according to the first adjustment parameter.

[0149] For example, when the first adjustment parameter is 1.2*1.414 and the DC bus voltage setting value is 690V, the DC bus voltage setting value can be adjusted according to the first adjustment parameter, that is, the adjusted DC bus voltage setting value Udc2=690*1.2*1.414.

[0150] S703: Determine that the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude, and use the preset voltage setting value as the DC bus voltage setting value.

[0151] It should be noted that the setting of the preset voltage setting value is not limited in this application and can be selected according to actual conditions.

[0152] Optionally, the preset voltage setting value may be set to 1200V.

[0153] Furthermore, when the target grid line voltage maximum amplitude is greater than the first target standard line voltage amplitude, the preset voltage setting value is used as the DC bus voltage setting value, that is, the DC bus voltage setting value Udc1 = 1200V.

[0154] It should be noted that in order to avoid overmodulation and hardware protection action and reduce the voltage on the DC side of the converter and the semiconductor power devices, after adjusting the DC bus voltage setting value, the reactive output of the grid-side converter also needs to be adjusted.

[0155] As a possible implementation, Figure 10 As shown, based on the above steps, the specific process of determining the reactive current output setting value of the grid-side converter includes the following steps:

[0156] S1001. Obtain the current per-unit voltage value, the current system frequency, and the inductance of the grid-side reactor.

[0157] The voltage per unit value is a dimensionless quantity and can generally be obtained by dividing the actual voltage value by the voltage reference value. Alternatively, the actual voltage value and the voltage reference value of the wind turbine generator can be obtained, and the quotient of the actual voltage value and the voltage reference value can be used as the current voltage per unit value of the wind turbine generator.

[0158] S1002: Determine a reactive current output setting value of the grid-side converter according to the current voltage per unit value, the current system frequency, and the inductance of the grid-side reactor.

[0159] It should be noted that after obtaining the current per-unit voltage value, the current system frequency, and the grid-side reactor inductance, the grid-side converter reactive current output setting value can be determined according to the following formula:

[0160]

[0161] Among them, U T is the current voltage per unit value, ω is the current system frequency, and L is the inductance of the grid-side reactor.

[0162] It should be noted that after obtaining the maximum grid line voltage amplitude up, the DC bus voltage setting value and the grid-side converter reactive current output setting value, it can be determined whether the wind turbine generator system has entered the high voltage ride-through state.

[0163] As a possible implementation, Figure 11 As shown, based on the above steps, the specific process of determining that the wind turbine generator system enters the high voltage ride-through state includes the following steps:

[0164] S1101: Obtain a fourth target ratio, and obtain a fourth target standard line voltage amplitude according to the fourth target ratio and the standard line voltage amplitude.

[0165] It should be noted that the setting of the fourth target ratio is not limited in this application and can be selected according to actual conditions.

[0166] Optionally, the fourth target ratio may be set to 110%.

[0167] It should be noted that the fourth target ratio may be consistent with the third target ratio or may be inconsistent with the third target ratio.

[0168] Furthermore, after the fourth target ratio is obtained, a fourth target standard line voltage amplitude may be obtained according to the fourth target ratio and the standard line voltage amplitude.

[0169] S1102: Determine that the maximum amplitude of the target grid line voltage is greater than the fourth target standard line voltage amplitude, and then determine that the wind turbine generator system enters a high voltage ride-through state.

[0170] In an embodiment of the present application, when the maximum amplitude of the target grid line voltage is greater than the fourth target standard line voltage amplitude, the fixed wind turbine generator system enters a high voltage ride-through state.

[0171] Furthermore, after it is determined that the wind turbine generator has entered the high voltage ride-through state, a high voltage ride-through flag may be set.

[0172] Furthermore, a fifth target ratio may be obtained, and a fifth target standard line voltage amplitude may be obtained according to the fifth target ratio and the standard line voltage amplitude.

[0173] It should be noted that the setting of the fifth target ratio is not limited in this application and can be selected according to actual conditions.

[0174] Optionally, the fifth target ratio may be set to 108%.

[0175] In an embodiment of the present application, after obtaining the fifth target ratio, the fifth target standard line voltage amplitude can be obtained based on the fifth target ratio and the standard line voltage amplitude, and when it is determined that the maximum amplitude of the target grid line voltage is less than the fifth target standard line voltage amplitude, it is determined that the wind turbine has exited the high voltage ride-through state.

[0176] Therefore, the control method of the wind turbine proposed in this application can quickly obtain the maximum value of the grid line voltage, and determine whether the wind turbine needs to enter the high voltage ride-through state based on the maximum value of the grid line voltage. It can also nonlinearly and dynamically adjust the grid-side converter DC bus voltage setting value according to the grid voltage increase amplitude, and when the bus setting value reaches the upper limit of the hardware tolerance, it also adjusts the grid-side converter reactive current output setting value at the same time to avoid overmodulation of the grid-side converter, reduce the voltage borne by the converter DC side and semiconductor power devices, and avoid hardware protection action.

[0177] In summary, the control method for the wind turbine set proposed in this application can quickly and accurately obtain the grid line voltage amplitude, dynamically adjust the converter DC bus voltage setting value, and achieve the high voltage ride-through capability of the wind turbine set.

[0178] To obtain the grid line voltage amplitude, such as Figure 12As shown, optionally, the three-phase line voltage of the wind turbine grid connection point can be obtained, and the three-phase line voltage of the wind turbine grid connection point is output to the wind turbine grid-side converter, and the current sampling value is stored, the variable grid line voltage maximum amplitude up is set, the AB phase line voltage sampling value is assigned to the grid line voltage maximum amplitude up, the grid line voltage maximum amplitude up is compared with the negative value of the AB phase line voltage sampling value, if it is less than, the negative value of the AB phase line voltage sampling value is assigned to the grid line voltage maximum amplitude up, the grid line voltage maximum amplitude up is compared with the BC phase line voltage sampling value, if it is less than, the BC phase line voltage sampling value is assigned to the grid line voltage maximum amplitude up, the grid line voltage maximum amplitude up is compared with the negative value of the BC phase line voltage sampling value, if If it is less than, the negative value of the BC phase line voltage sampling value is assigned to the maximum grid line voltage amplitude up, and the maximum grid line voltage amplitude up is compared with the CA phase line voltage sampling value. If it is less than, the CA phase line voltage sampling value is assigned to the maximum grid line voltage amplitude up, and the maximum grid line voltage amplitude up is compared with the negative value of the CA phase line voltage sampling value. If it is less than, the negative value of the CA phase line voltage sampling value is assigned to the maximum grid line voltage amplitude up, and the maximum grid line voltage amplitude up is compared with 110% of the standard line voltage amplitude. If it is greater than, the wind turbine enters the high voltage ride-through state, and the maximum grid line voltage amplitude up is compared with 108% of the standard line voltage amplitude. If it is less than, the wind turbine exits the high voltage ride-through state.

[0179] To dynamically adjust the converter DC bus voltage setting value, such as Figure 13 As shown, the maximum grid line voltage amplitude up can optionally be set to 690V. When the wind turbine is operating normally, the DC bus voltage setting value is: Udc = Kp*up / Kdc. Kp is the adjustment coefficient 1, Kdc is the bus utilization coefficient, Kp has a default value of 1.0, and Kdc has a default value of 0.98. The maximum grid line voltage amplitude up can be compared with 110% of the standard line voltage amplitude. If it is greater, the DC bus voltage setting value is dynamically adjusted to the first high-throughput setting value Udc1 = 1.15*690*1.414. The maximum grid line voltage amplitude up can be compared with 115% of the standard line voltage amplitude. If it is greater, the DC bus voltage setting value is dynamically adjusted to the second high-throughput setting value Udc2 = 1.2*690*1.414. The maximum amplitude up of the grid line voltage is compared with 120% of the standard line voltage amplitude. If it is greater, the DC bus voltage setting value is dynamically adjusted to the third high-pass setting value Udc3=1200V.

[0180] At the same time, the grid-side converter needs to adjust the reactive output to avoid overmodulation. The reactive current output setting value of the grid-side converter is as follows: Among them, U Tis the current voltage per unit value, ω is the current system frequency, and L is the inductance of the grid-side reactor.

[0181] To achieve high voltage ride-through capability of wind turbines, such as Figure 14 As shown, optionally, the voltage at the grid-connected point of the wind turbine is obtained, and the maximum amplitude up of the grid line voltage, the DC bus voltage setting value, and the grid-side converter reactive current output setting value are obtained respectively according to the above method, which can avoid overmodulation of the grid-side converter, reduce the voltage on the DC side of the converter and the semiconductor power devices, and avoid hardware protection action.

[0182] In order to implement the above embodiment, this embodiment provides a control device for a wind turbine generator set. Figure 15 A schematic structural diagram of a control device for a wind turbine generator system provided in an embodiment of the present application.

[0183] like Figure 15 As shown, the control device 1000 of the wind turbine generator system includes: a first acquisition module 110 , a second acquisition module 120 , a third acquisition module 130 and an adjustment module 140 .

[0184] The first acquisition module 110 is used to obtain the initial three-phase line voltage of the grid connection point of the wind turbine generator;

[0185] A second acquisition module 120 is configured to acquire a target sampling frequency and continue sampling according to the target sampling frequency to acquire at least one three-phase line voltage;

[0186] A third acquisition module 130 is configured to acquire a maximum value of a target grid line voltage based on the initial three-phase line voltage and the three-phase line voltage;

[0187] The adjustment module 140 is configured to adjust a DC bus voltage setting value according to the target maximum grid line voltage value.

[0188] According to one embodiment of the present application, the third acquisition module 130 is further used to: obtain the initial first two-phase line voltage based on the initial three-phase line voltage, and obtain the first two-phase line voltage based on the three-phase line voltage; use the initial first two-phase line voltage as the maximum amplitude of the initial grid line voltage, and determine whether the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage; if it is determined that the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage, then use the negative value of the first two-phase line voltage as the maximum amplitude of the target grid line voltage.

[0189] According to one embodiment of the present application, the third acquisition module 130 is also used to: determine that the maximum amplitude of the initial grid line voltage is greater than the negative value of the first two-phase line voltage, then obtain the initial second two-phase line voltage based on the initial three-phase line voltage, and obtain the second two-phase line voltage based on the three-phase line voltage; judge whether the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage; determine that the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage, then use the initial second two-phase line voltage as the target grid line voltage maximum amplitude.

[0190] According to one embodiment of the present application, the third acquisition module 130 is also used to: determine that the maximum amplitude of the initial grid line voltage is greater than the initial second two-phase line voltage, then judge whether the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage; determine that the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage, then use the negative value of the second two-phase line voltage as the target grid line voltage maximum amplitude.

[0191] According to one embodiment of the present application, the third acquisition module 130 is also used to: determine that the maximum amplitude of the initial grid line voltage is greater than the negative value of the second two-phase line voltage, then obtain the initial third two-phase line voltage based on the initial three-phase line voltage, and obtain the third two-phase line voltage based on the three-phase line voltage; judge whether the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage; determine that the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage, then use the initial third two-phase line voltage as the target grid line voltage maximum amplitude.

[0192] According to one embodiment of the present application, the third acquisition module 130 is further used to: determine that the maximum amplitude of the initial grid line voltage is greater than the initial third two-phase line voltage, then judge whether the maximum amplitude of the initial grid line voltage is less than the negative value of the third two-phase line voltage; determine that the maximum amplitude of the initial grid line voltage is less than the negative value of the third two-phase line voltage, then use the negative value of the third two-phase line voltage as the target grid line voltage maximum amplitude.

[0193] According to one embodiment of the present application, the adjustment module 140 is further used to: obtain the standard line voltage amplitude and the first target ratio, and obtain the first target standard line voltage amplitude based on the standard line voltage amplitude and the first target ratio; determine whether the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude; if it is determined that the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude, then use the preset voltage setting value as the DC bus voltage setting value.

[0194] According to one embodiment of the present application, the adjustment module 140 is further used to: determine that the maximum amplitude of the target grid line voltage is less than or equal to the first target standard line voltage amplitude, then obtain a second target ratio, and obtain a second target standard line voltage amplitude based on the second target ratio and the standard line voltage amplitude; determine whether the maximum amplitude of the target grid line voltage is greater than the second target standard line voltage amplitude; determine that the maximum amplitude of the target grid line voltage is greater than the second target standard line voltage amplitude, then obtain a first adjustment parameter, and adjust the DC bus voltage set value based on the first adjustment parameter.

[0195] According to one embodiment of the present application, the adjustment module 140 is further used to: determine whether the maximum amplitude of the target grid line voltage is less than or equal to the second target standard line voltage amplitude, obtain a third target ratio, and obtain a third target standard line voltage amplitude based on the third target ratio and the standard line voltage amplitude; determine whether the maximum amplitude of the target grid line voltage is greater than the third target standard line voltage amplitude; if it is determined that the maximum amplitude of the target grid line voltage is greater than the third target standard line voltage amplitude, obtain a second adjustment parameter, and adjust the DC bus voltage set value based on the second adjustment parameter.

[0196] According to one embodiment of the present application, the device 1000 is also used to: obtain the current voltage per unit value, the current system frequency and the grid-side inductance; and determine the grid-side converter reactive current output setting value based on the current voltage per unit value, the current system frequency and the grid-side inductance.

[0197] According to one embodiment of the present application, the device 1000 is further used to: obtain a fourth target ratio, and obtain a fourth target standard line voltage amplitude based on the fourth target ratio and the standard line voltage amplitude; determine that the maximum amplitude of the target grid line voltage is greater than the fourth target standard line voltage amplitude, then determine that the wind turbine enters the high voltage ride-through state.

[0198] According to an embodiment of the present application, the apparatus 1000 is further configured to: set a high voltage ride-through flag.

[0199] The wind turbine control device provided in this application obtains the initial three-phase line voltage at the wind turbine's grid connection point, obtains a target sampling frequency, and continues sampling according to the target sampling frequency to obtain at least one three-phase line voltage. Based on the initial three-phase line voltage and the three-phase line voltage, the target maximum grid line voltage amplitude is obtained. Based on the target maximum grid line voltage amplitude, the DC bus voltage set value is adjusted. Thus, the application can quickly and accurately detect the amplitude of the grid line voltage, thereby determining whether the wind turbine needs to enter a high voltage ride-through state. It can also nonlinearly and dynamically adjust the converter DC bus voltage set value, solving the problem of grid-side converter shutdown caused by overmodulation faults.

[0200] In order to implement the above embodiment, the present application also proposes an electronic device 2000, such as Figure 16 As shown, it includes: a memory 210, a processor 220 and a computer program stored in the memory 210 and executable on the processor 220. When the processor executes the program, the control method of the wind turbine generator set as described in the first aspect is implemented.

[0201] In order to implement the above embodiment, the present application proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable the computer to execute the wind turbine control method described in the first aspect.

[0202] In order to implement the above embodiments, the present application further proposes a computer program product, including a computer program, which implements the control method of the wind turbine generator set described in the first aspect when executed by a processor.

[0203] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in this application can be achieved. This is not a limitation herein.

[0204] The above specific embodiments do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles disclosed in this application shall be included in the scope of protection of this application.

Claims

1. A method for controlling a wind turbine generator system, comprising: Obtain the initial three-phase line voltage of the wind turbine grid connection point; Obtaining a target sampling frequency, and continuing sampling according to the target sampling frequency to obtain at least one three-phase line voltage; Obtaining a maximum value of a target grid line voltage according to the initial three-phase line voltage and the three-phase line voltage; Adjusting the DC bus voltage setting value according to the target maximum grid line voltage value; The step of obtaining a target grid line voltage maximum value according to the initial three-phase line voltage and the three-phase line voltage includes: According to the initial three-phase line voltage, an initial first two-phase line voltage is obtained, and according to the three-phase line voltage, a first two-phase line voltage is obtained; Taking the initial first two-phase line voltage as the maximum amplitude of the initial grid line voltage, and determining whether the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage; Determining that the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage, and using the negative value of the first two-phase line voltage as the maximum amplitude of the target grid line voltage; After determining whether the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage, the method further includes: Determining that the maximum amplitude of the initial grid line voltage is greater than the negative value of the first two-phase line voltage, obtaining an initial second two-phase line voltage based on the initial three-phase line voltage, and obtaining a second two-phase line voltage based on the three-phase line voltage; Determining whether the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage; Determining that the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage, and using the initial second two-phase line voltage as the maximum amplitude of the target grid line voltage; After determining whether the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage, the method further includes: Determining that the maximum amplitude of the initial grid line voltage is greater than the initial second two-phase line voltage, then determining whether the maximum amplitude of the initial grid line voltage is less than a negative value of the second two-phase line voltage; Determining that the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage, and using the negative value of the second two-phase line voltage as the maximum amplitude of the target grid line voltage; After determining whether the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage, the method further includes: Determining that the maximum amplitude of the initial grid line voltage is greater than the negative value of the second two-phase line voltage, obtaining an initial third two-phase line voltage based on the initial three-phase line voltage, and obtaining a third two-phase line voltage based on the three-phase line voltage; Determining whether the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage; Determining that the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage, and using the initial third two-phase line voltage as the maximum amplitude of the target grid line voltage; After determining whether the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage, the method further includes: Determining that the maximum amplitude of the initial grid line voltage is greater than the initial third two-phase line voltage, then determining whether the maximum amplitude of the initial grid line voltage is less than a negative value of the third two-phase line voltage; If it is determined that the maximum amplitude of the initial grid line voltage is less than the negative value of the third two-phase line voltage, the negative value of the third two-phase line voltage is used as the maximum amplitude of the target grid line voltage.

2. The control method according to claim 1, wherein: The adjusting the DC bus voltage setting value according to the target maximum grid line voltage value includes: Acquire a standard line voltage amplitude and a first target ratio, and acquire a first target standard line voltage amplitude according to the standard line voltage amplitude and the first target ratio; Determining whether the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude; If it is determined that the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude, a preset voltage setting value is used as the DC bus voltage setting value.

3. The control method according to claim 2, wherein: After determining whether the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude, the method further includes: If it is determined that the target grid line voltage maximum amplitude is less than or equal to the first target standard line voltage amplitude, a second target ratio is obtained, and a second target standard line voltage amplitude is obtained according to the second target ratio and the standard line voltage amplitude; Determining whether the maximum amplitude of the target grid line voltage is greater than the amplitude of the second target standard line voltage; If it is determined that the target grid line voltage maximum amplitude is greater than the second target standard line voltage amplitude, a first adjustment parameter is obtained, and the DC bus voltage set value is adjusted based on the first adjustment parameter.

4. The control method according to claim 3, wherein: After determining whether the maximum amplitude of the target grid line voltage is greater than the second target standard line voltage amplitude, the method further includes: Determining that the target grid line voltage maximum amplitude is less than or equal to the second target standard line voltage amplitude, obtaining a third target ratio, and obtaining a third target standard line voltage amplitude based on the third target ratio and the standard line voltage amplitude; Determining whether the maximum amplitude of the target grid line voltage is greater than the third target standard line voltage amplitude; If it is determined that the target grid line voltage maximum amplitude is greater than the third target standard line voltage amplitude, a second adjustment parameter is obtained, and the DC bus voltage set value is adjusted based on the second adjustment parameter.

5. The control method according to any one of claims 2 to 4, wherein: The method further comprises: Get the current voltage per unit value, current system frequency and grid-side reactor inductance; A reactive current output setting value of the grid-side converter is determined according to the current voltage per unit value, the current system frequency and the grid-side reactor inductance.

6. The control method according to claim 4, wherein: The method further comprises: Obtaining a fourth target ratio, and obtaining a fourth target standard line voltage amplitude according to the fourth target ratio and the standard line voltage amplitude; If it is determined that the maximum amplitude of the target grid line voltage is greater than the fourth target standard line voltage amplitude, it is determined that the wind turbine generator system enters a high voltage ride-through state.

7. The control method according to claim 6, wherein: After determining that the wind turbine generator set enters the high voltage ride-through state, the method further includes: Set the high voltage ride through flag.

8. The control method according to claim 6, wherein: After determining that the wind turbine generator set enters the high voltage ride-through state, the method further includes: Acquire a fifth target ratio, and acquire a fifth target standard line voltage amplitude according to the fifth target ratio and the standard line voltage amplitude; If it is determined that the target grid line voltage maximum amplitude is less than the fifth target standard line voltage amplitude, it is determined that the wind turbine generator system exits the high voltage ride-through state.

9. The control method according to claim 8, wherein: After determining that the wind turbine generator set has exited the high voltage ride-through state, the method further includes: Clear the high voltage ride through flag.

10. A control device for a wind turbine generator system, comprising: The first acquisition module is used to obtain the initial three-phase line voltage of the grid connection point of the wind turbine generator; a second acquisition module, configured to acquire a target sampling frequency and continue sampling according to the target sampling frequency to acquire at least one three-phase line voltage; a third acquisition module, configured to acquire a maximum value of a target grid line voltage according to the initial three-phase line voltage and the three-phase line voltage; An adjustment module, configured to adjust a DC bus voltage setting value according to the target maximum grid line voltage value; The third acquisition module is further configured to acquire an initial first two-phase line voltage based on the initial three-phase line voltage, and acquire a first two-phase line voltage based on the three-phase line voltage; Taking the initial first two-phase line voltage as the maximum amplitude of the initial grid line voltage, and determining whether the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage; Determining that the maximum amplitude of the initial grid line voltage is less than the negative value of the first two-phase line voltage, and using the negative value of the first two-phase line voltage as the maximum amplitude of the target grid line voltage; The third acquisition module is further configured to: Determining that the maximum amplitude of the initial grid line voltage is greater than the negative value of the first two-phase line voltage, obtaining an initial second two-phase line voltage based on the initial three-phase line voltage, and obtaining a second two-phase line voltage based on the three-phase line voltage; Determining whether the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage; Determining that the maximum amplitude of the initial grid line voltage is less than the initial second two-phase line voltage, and using the initial second two-phase line voltage as the maximum amplitude of the target grid line voltage; The third acquisition module is further configured to: Determining that the maximum amplitude of the initial grid line voltage is greater than the initial second two-phase line voltage, then determining whether the maximum amplitude of the initial grid line voltage is less than a negative value of the second two-phase line voltage; Determining that the maximum amplitude of the initial grid line voltage is less than the negative value of the second two-phase line voltage, and using the negative value of the second two-phase line voltage as the maximum amplitude of the target grid line voltage; The third acquisition module is further configured to: Determining that the maximum amplitude of the initial grid line voltage is greater than the negative value of the second two-phase line voltage, obtaining an initial third two-phase line voltage based on the initial three-phase line voltage, and obtaining a third two-phase line voltage based on the three-phase line voltage; Determining whether the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage; Determining that the maximum amplitude of the initial grid line voltage is less than the initial third two-phase line voltage, and using the initial third two-phase line voltage as the maximum amplitude of the target grid line voltage; The third acquisition module is further configured to: Determining that the maximum amplitude of the initial grid line voltage is greater than the initial third two-phase line voltage, then determining whether the maximum amplitude of the initial grid line voltage is less than a negative value of the third two-phase line voltage; If it is determined that the maximum amplitude of the initial grid line voltage is less than the negative value of the third two-phase line voltage, the negative value of the third two-phase line voltage is used as the maximum amplitude of the target grid line voltage.

11. The control device according to claim 10, wherein: The adjustment module is further used to: Acquire a standard line voltage amplitude and a first target ratio, and acquire a first target standard line voltage amplitude according to the standard line voltage amplitude and the first target ratio; Determining whether the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude; If it is determined that the maximum amplitude of the target grid line voltage is greater than the first target standard line voltage amplitude, a preset voltage setting value is used as the DC bus voltage setting value.

12. The control device according to claim 11, wherein: The adjustment module is further used to: If it is determined that the target grid line voltage maximum amplitude is less than or equal to the first target standard line voltage amplitude, a second target ratio is obtained, and a second target standard line voltage amplitude is obtained according to the second target ratio and the standard line voltage amplitude; Determining whether the maximum amplitude of the target grid line voltage is greater than the amplitude of the second target standard line voltage; If it is determined that the target grid line voltage maximum amplitude is greater than the second target standard line voltage amplitude, a first adjustment parameter is obtained, and the DC bus voltage set value is adjusted based on the first adjustment parameter.

13. The control device according to claim 12, wherein: The adjustment module is further used to: Determining that the target grid line voltage maximum amplitude is less than or equal to the second target standard line voltage amplitude, obtaining a third target ratio, and obtaining a third target standard line voltage amplitude based on the third target ratio and the standard line voltage amplitude; Determining whether the maximum amplitude of the target grid line voltage is greater than the third target standard line voltage amplitude; If it is determined that the target grid line voltage maximum amplitude is greater than the third target standard line voltage amplitude, a second adjustment parameter is obtained, and the DC bus voltage set value is adjusted based on the second adjustment parameter.

14. The control device according to any one of claims 11 to 13, wherein: The device is also used for: Get the current voltage per unit value, current system frequency and grid-side reactor inductance; A reactive current output setting value of the grid-side converter is determined according to the current voltage per unit value, the current system frequency and the grid-side reactor inductance.

15. The control device according to claim 13, wherein: The device is also used for: Obtaining a fourth target ratio, and obtaining a fourth target standard line voltage amplitude according to the fourth target ratio and the standard line voltage amplitude; If it is determined that the maximum amplitude of the target grid line voltage is greater than the fourth target standard line voltage amplitude, it is determined that the wind turbine generator system enters a high voltage ride-through state.

16. The control device according to claim 15, wherein: The device is further used for: Set the high voltage ride through flag.

17. The control device according to claim 15, wherein: The device is further used for: Acquire a fifth target ratio, and acquire a fifth target standard line voltage amplitude according to the fifth target ratio and the standard line voltage amplitude; If it is determined that the target grid line voltage maximum amplitude is less than the fifth target standard line voltage amplitude, it is determined that the wind turbine generator system exits the high voltage ride-through state.

18. The control device according to claim 17, wherein: The device is further used for: Clear the high voltage ride through flag.

19. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the control method for the wind turbine set according to any one of claims 1 to 9 is implemented.

20. A non-transitory computer-readable storage medium storing computer instructions, wherein: The computer instructions are used to enable the computer to execute the wind turbine control method according to any one of claims 1 to 9.

21. A computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements the wind turbine control method according to any one of claims 1 to 9.

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