Control method, device, main controller and medium for multi-bus converter of wind turbine generator set

Abstract

The present application discloses a control method, device, main controller and medium for a multi-bus converter of a wind turbine generator set, belonging to the field of wind power generation technology. The method includes: when a power module connected to any bus of the multi-bus converter fails, cutting off the failed power module; obtaining the cut-in wind speed and wind speed demarcation threshold of the wind turbine generator set, the wind speed demarcation threshold including the wind speed when the total power output of the wind turbine generator set when (N-M) power modules are put into operation is equal to the total power output of the wind turbine generator set when (N-M+X) power modules are put into operation; predicting the wind speed within a predetermined time period based on the collected wind speed prediction data; determining the operating mode of the multi-bus converter using the predicted wind speed within the predetermined time period, the cut-in wind speed of the wind turbine generator set and the wind speed demarcation threshold. According to the embodiment of the present application, the utilization rate of the wind turbine generator set can be improved.

Description

Technical Field

[0001] The present application belongs to the field of wind power generation technology, and in particular relates to a control method, device, main controller and medium for a multi-bus converter of a wind turbine generator set. Background Art

[0002] The converter is one of the core components of a wind turbine and plays a crucial role in wind power generation systems. To increase the power generated by a wind turbine, a multi-bus converter can be used. A multi-bus converter consists of multiple power modules connected in parallel.

[0003] If a power module in a multi-bus converter fails, the wind turbine generator set can remove the faulty power module and replace it with a new, fault-free power module. However, replacing the new power module requires heating and dehumidification. During this heating and dehumidification process, the multi-bus converter must be shut down, and the wind turbine generator set must also be shut down. A shut-down wind turbine generator set cannot generate electricity, resulting in a loss of power generation and reduced wind turbine utilization. Summary of the Invention

[0004] The embodiments of the present application provide a control method, device, main controller and medium for a multi-bus converter of a wind turbine generator set, which can improve the utilization rate of the wind turbine generator set.

[0005] In a first aspect, an embodiment of the present application provides a control method for a multi-bus converter of a wind turbine generator set, the multi-bus converter comprising N buses, each bus connected to a power module, N being an integer greater than 1, the method comprising: when a power module connected to any bus of the multi-bus converter fails, cutting off the failed power module; obtaining a cut-in wind speed and a wind speed demarcation threshold of the wind turbine generator set, the wind speed demarcation threshold comprising the wind speed at which the total power output of the wind turbine generator set when (NM) power modules are put into operation is equal to the total power output of the wind turbine generator set when (N-M+X) power modules are put into operation, M being the number of failed power modules cut off, and X being the number of power modules to be newly cut in; predicting the wind speed within a predetermined time period based on the collected wind speed prediction data; determining an operating mode of the multi-bus converter using the predicted wind speed within the predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold, the operating mode comprising whether the power modules to be newly cut in are heated and dehumidified and the power modules to be put into operation are heated and dehumidified within the predetermined time period.

[0006] In some possible embodiments, the operating mode includes a first operating mode and a second operating mode; the first operating mode includes heating and dehumidifying the power modules to be newly switched on within a predetermined period of time, and putting the heated and dehumidified power modules into operation, keeping (N-M+X) power modules in operation; the second operating mode includes not heating and dehumidifying the power modules to be newly switched on within a predetermined period of time, and keeping (NM) non-faulty power modules in operation.

[0007] In some possible embodiments, the operation mode of the multi-bus converter is determined using the predicted wind speed within a predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold, including: when the predicted wind speed within the predetermined time period is greater than the wind speed demarcation threshold, predicting the lost power generation, the first operation mode power generation, and the second operation mode power generation, the lost power generation is the power generation lost within the heating and dehumidification time period, the first operation mode power generation is the power generation when the multi-bus converter executes the first operation mode, and the second operation mode power generation is the power generation when the multi-bus converter executes the second operation mode; calculating the power generation difference between the first operation mode power generation and the second operation mode power generation; when the lost power generation is less than the power generation difference, controlling the multi-bus converter to execute the first operation mode; when the lost power generation is greater than or equal to the power generation difference, controlling the multi-bus converter to execute the second operation mode.

[0008] In some possible embodiments, predicting the lost power generation, the first operating mode power generation, and the second operating mode power generation includes: obtaining a first correspondence between a pre-determined wind speed and a first power and a second correspondence between a pre-determined wind speed and a second power, the first power being the total power output by the wind turbine generator set within a predetermined time when (N-M+X) power modules are put into operation, and the second power being the total power output by the wind turbine generator set within a predetermined time when (NM) power modules are put into operation; predicting the lost power generation based on the predicted wind speed within the predetermined time, the preset total heating and dehumidification time, and the second correspondence; predicting the first operating mode power generation based on the predicted wind speed within the predetermined time, the preset total heating and dehumidification time, and the first correspondence; predicting the second operating mode power generation based on the predicted wind speed within the predetermined time and the second correspondence.

[0009] In some possible embodiments, the operating mode of the multi-bus converter is determined using the predicted wind speed within a predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold, including: when the predicted wind speed within the predetermined time period is less than the cut-in wind speed, controlling the multi-bus converter to execute the first operating mode.

[0010] In some possible embodiments, the operating mode of the multi-bus converter is determined using the predicted wind speed within a predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold, including: when the predicted wind speed within the predetermined time period is within the range between the cut-in wind speed and the wind speed demarcation threshold, controlling the multi-bus converter to execute the second operating mode.

[0011] In some possible embodiments, the method further includes: when the time for heating and dehumidifying the power module to be newly switched on does not reach the preset total heating and dehumidification time, again predicting the wind speed within the predetermined time based on the collected wind speed prediction data, and using the predicted wind speed within the predetermined time, the cut-in wind speed of the wind turbine generator set, and the wind speed boundary threshold to determine the operating mode of the multi-bus converter.

[0012] In a second aspect, an embodiment of the present application provides a control device for a multi-bus converter of a wind turbine generator set, wherein the multi-bus converter includes N buses, each bus is connected to a power module, and N is an integer greater than 1. The device includes: a fault removal module for removing the faulty power module when a power module connected to any bus of the multi-bus converter fails; a data acquisition module for obtaining the cut-in wind speed and wind speed demarcation threshold of the wind turbine generator set, wherein the wind speed demarcation threshold includes the total power output of the wind turbine generator set when (NM) power modules are put into operation and the total power output of the wind turbine generator set when (N-M+X) power modules are put into operation. The wind speed prediction module is configured to predict the wind speed within a predetermined time period based on the collected wind speed prediction data; and the operation mode determination module is configured to determine the operation mode of the multi-bus converter using the predicted wind speed within the predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold. The operation mode includes whether to heat and dehumidify the power modules to be newly cut in and whether to put the power modules into operation within the predetermined time period.

[0013] In a third aspect, an embodiment of the present application provides a main controller comprising: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, the control method of the multi-bus converter of the wind turbine generator set according to the first aspect is implemented.

[0014] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the control method for a multi-bus converter of a wind turbine generator set according to the first aspect is implemented.

[0015] The present application provides a control method, device, main controller and medium for a multi-bus converter of a wind turbine generator set, which can cut off the faulty power module when a power module connected to the bus of the multi-bus converter fails. The power generation of the wind turbine generator set is related to the wind speed and the number of running power modules. The wind speed within a predetermined time period is predicted based on the collected wind speed prediction data. The predicted wind speed, the cut-in wind speed of the wind turbine generator set and the wind speed demarcation threshold are used to predict the power generation of the wind turbine generator set under different operating modes within the predetermined time period, including whether to heat and dehumidify the power modules to be newly cut in and which modules are put into operation. The operating mode with less power generation loss of the wind turbine generator set is selected, thereby reducing the power generation loss of the wind turbine generator set and improving the utilization rate of the wind turbine generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A simplified schematic diagram of an example of a wind turbine generator set corresponding to a four-bus converter provided in an embodiment of the present application;

[0018] Figure 2 This is a flow chart of an embodiment of a control method for a multi-bus converter of a wind turbine generator set provided by the present application;

[0019] Figure 3 A schematic diagram of a curve showing wind speed and total output power of a wind turbine generator set with three busbars and a wind turbine generator set with four busbars provided in an embodiment of the present application;

[0020] Figure 4 A flow chart of another embodiment of the control method for a multi-bus converter of a wind turbine generator set provided by the present application;

[0021] Figure 5 This is a flow chart of another embodiment of the control method for a multi-bus converter of a wind turbine generator set provided by the present application;

[0022] Figure 6 A schematic structural diagram of an embodiment of a control device for a multi-bus converter of a wind turbine generator set provided by the present application;

[0023] Figure 7 A schematic structural diagram of another embodiment of a control device for a multi-bus converter of a wind turbine generator set provided by the present application;

[0024] Figure 8This is a structural diagram of an embodiment of the main controller provided by this application. DETAILED DESCRIPTION

[0025] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0026] The converter is a core component of a wind turbine and plays a crucial role in wind power generation systems. To increase the power generated by a wind turbine, a multi-bus converter can be used. A multi-bus converter consists of N busbars, each connected to a power module, where N is an integer greater than 1. These N power modules are connected in parallel. Figure 1 This is a simplified schematic diagram of an example of a wind turbine generator set corresponding to the four-bus converter provided in the embodiment of the present application. Figure 1 As shown, the four-bus converter may include four busbars 11, each busbar connected to a converter module 12. Each converter module 12 may include more than two converter sub-modules (in Figure 1 (not shown). The converter module 12 is connected to the generator 13 of the wind turbine generator set via switch K1, and the converter module 12 is connected to the power grid 14 via switch K2, thereby enabling the exchange of electrical energy between the wind turbine generator set and the power grid. Switches K1 and K2 can be implemented as switching devices such as circuit breakers, which is not limited here.

[0027] In a multi-busbar converter, the converter modules connected to the busbars may become damaged. If any converter module fails, the main controller controlling the multi-busbar converter will disconnect the faulty converter module and maintain the operation of the remaining converter modules. However, in this case, the wind turbine will not be able to meet its rated power. To enable the wind turbine to operate at its rated power, unused, healthy converter modules can be put into operation. However, to ensure the safety of the converter modules being put into operation, the wind turbine must be shut down to heat and dehumidify the unused, healthy converter modules to be put into operation. This is to prevent condensation on these modules, which could cause wind turbine failure. During the heating and dehumidification process, the wind turbine must be shut down and unable to generate electricity, resulting in a loss of power generation and reduced wind turbine utilization.

[0028] The present application provides a control method, device, main controller, and medium for a multi-busbar converter of a wind turbine generator set, which can disconnect the faulty power module when any busbar-connected power module fails. The method predicts wind speed and, based on the predicted wind speed, the obtained cut-in wind speed, and the obtained wind speed demarcation threshold, determines whether to heat and dehumidify the converter module to be newly cut in and whether to put the converter module to be newly cut in into operation. The method implements an operating mode with relatively less power generation loss, thereby reducing power generation loss and improving the utilization rate of the wind turbine generator set.

[0029] Figure 2 This is a flow chart of an embodiment of a control method for a multi-bus converter of a wind turbine generator set provided by this application. Figure 2 As shown, the control method of the multi-bus converter of the wind turbine generator set may include steps S201 to S204.

[0030] In step S201 , when a power module connected to any busbar of a multi-busbar converter fails, the failed power module is disconnected.

[0031] If a power module connected to any bus of a multi-bus converter fails, the bus is deemed to have failed. The controller of the multi-bus converter can report the information of the failed bus to the main controller. The main controller can be implemented as a programmable logic controller (PLC), but is not limited here. The main controller can issue a command to cut off the failed bus, that is, to cut off the failed power module connected to the bus. Specifically, the bus can be controlled to disconnect the switches on the generator and grid side of the wind turbine generator set to cut off the failed bus, that is, to cut off the failed power module. After the failed bus is cut off, that is, after the failed power module is cut off, the failed bus will no longer execute commands and will no longer upload fault information. The failed bus is automatically cut off without manual operation, reducing the labor maintenance cost of the multi-bus converter.

[0032] For example, in Figure 1 In the event of a failure of the first power module 12, at least one of the switches K1 and K2 on the bus 11 to which the first power module 12 is connected may be disconnected to remove the first power module 12 from the wind turbine generator set.

[0033] In step S202, the cut-in wind speed and wind speed threshold of the wind turbine generator set are obtained.

[0034] The wind turbine's cut-in wind speed is the minimum wind speed at which the wind turbine begins grid-connected power generation. The wind speed threshold is the wind speed at which the total power output of the wind turbine when (NM) power modules are operational is equal to the total power output of the wind turbine when (N-M+X) power modules are operational. M is the number of faulty power modules to be removed, an integer greater than or equal to 1. X is the number of power modules to be newly switched in, an integer greater than or equal to 1.

[0035] The rated power of a wind turbine generator set with M faulty power modules removed can only reach (NM) / N of the rated power of a wind turbine generator set with N intact power modules. For example, a four-busbar converter is equipped with four power modules. If one busbar fails and that busbar is removed, the wind turbine generator set will operate on three busbars. The rated power of the wind turbine generator set operating on three busbars is 0.75 times the rated power of the wind turbine generator set operating on four busbars.

[0036] In some examples, X can be less than or equal to M. For example, if two busbars in a four-busbar converter fail, correspondingly, two of the four power modules that failed are removed; new power modules can be added to the four-busbar converter, either one or two; however, it is necessary to ensure that the three-busbar converter formed by adding the one new power module can also operate normally and meet the basic requirements of the wind turbine generator set. For another example, if one busbar in a four-busbar converter fails, correspondingly, one of the four power modules that failed is removed; and a new power module is added to the four-busbar converter.

[0037] For example, if a converter normally has a four-busbar structure but can also operate normally with three busbars, if two busbars fail (i.e., two power modules are removed), then when only the two power modules on the remaining two busbars are operating, the wind speed threshold can be wind speed a, where the total power output of the wind turbine generator set with two busbars (i.e., two power modules) equals the total power output of the wind turbine generator set with three busbars (i.e., three power modules). Alternatively, the wind speed threshold can be wind speed b, where the total power output of the wind turbine generator set with two busbars (i.e., two power modules) equals the total power output of the wind turbine generator set with four busbars (i.e., four power modules). Whether to use wind speed a or wind speed b as the wind speed threshold depends on the operating conditions before the fault. If the system was operating with only one busbar (i.e., four power modules) before the fault, wind speed b can be used as the wind speed threshold. If one busbar (i.e., one power module) was removed due to a fault before the fault occurred, meaning the system was operating with three busbars before the fault, wind speed a can be used as the wind speed threshold.

[0038] Figure 3This is a curve diagram of an example of wind speed and total output power of a wind turbine generator set with three busbars and a wind turbine generator set with four busbars provided in the embodiment of the present application. Taking N=4, M=1, and X=1 as an example, Figure 3 As shown, V0 is the cut-in wind speed of the wind turbine generator set. When the total power output of the wind turbine generator set with three buses is equal to the total power output of the wind turbine generator set with four buses, the corresponding wind speed V1 is the wind speed demarcation threshold. Figure 3 The wind speed corresponding to the intersection of the wind speed-power curve of the wind turbine generator set operating on the middle three busbars and the wind speed-power curve of the wind turbine generator set operating on the fourth busbars is the wind speed demarcation threshold.

[0039] In step S203, the wind speed within a predetermined time period is predicted based on the collected wind speed prediction data.

[0040] Wind speed prediction data may include data collected by wind towers, data collected by wind radars, data collected by meteorological agencies, and the like, such as meteorological data and airflow movement data, and is not limited here. A pre-established wind speed prediction model can be used to utilize the wind speed prediction data to predict the wind speed within a predetermined time period. The predetermined time period is the time period during which an accurate wind speed can be predicted, that is, the wind speed predicted within the predetermined time period is the effective wind speed. The predetermined time period can be determined based on the specific scenario and needs, and is not limited here. For example, the wind speed within four hours after the current moment can be predicted based on the collected wind speed prediction data.

[0041] In step S204, the operation mode of the multi-bus converter is determined using the predicted wind speed within a predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold.

[0042] The operation mode includes whether to heat and dehumidify the power modules to be newly switched in and the power modules to be put into operation within a predetermined time. The operation mode of the multi-bus converter is determined and executed.

[0043] In some examples, the operating mode may include a first operating mode and a second operating mode.

[0044] The first operating mode involves heating and dehumidifying the power modules to be newly switched in for a predetermined period of time, then switching the heated and dehumidified power modules into operation, and maintaining (N-M+X) power modules in operation. Specifically, in the first operating mode, the X power modules to be newly switched in are heated and dehumidified. During the heating and dehumidification process, the wind turbine generator set is shut down. After the heating and dehumidification process is complete, the X power modules to be newly switched in are switched into operation, and the wind turbine generator set maintains (N-M+X) power modules in operation.

[0045] The second operating mode includes not performing heating and dehumidification on the power modules to be newly switched in for a predetermined period of time, and maintaining the (NM) healthy power modules in operation. Specifically, in the second operating mode, heating and dehumidification are not performed on the X power modules to be newly switched in, nor are these X power modules put into operation, while the original (NM) healthy power modules in the multi-bus converter remain in operation.

[0046] Based on the predicted wind speed within a predetermined time period, the power generation of the wind turbine generator set when multiple bus converters (NM) power modules are in operation and the power generation of the wind turbine generator set when multiple bus converters (N-M+X) power modules are in operation can be predicted. The power generation of the wind turbine generator set is related to the wind speed and the number of operating power modules. Within different wind speed ranges defined by the cut-in wind speed and the wind speed demarcation threshold, the power generation of the wind turbine generator set may vary with wind speed. Based on the predicted wind speed within a predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold, the power generation of the wind turbine generator set when multiple bus converters (NM) power modules are in operation and the power generation of the wind turbine generator set when multiple bus converters (N-M+X) power modules are in operation are predicted, so as to select an operating mode that reduces power generation loss for the wind turbine generator set.

[0047] In an embodiment of the present application, in the event that a power module connected to the busbar of a multi-bus converter fails, the failed power module is removed. The power generation of a wind turbine is related to the wind speed and the number of operating power modules. The wind speed within a predetermined time period is predicted based on the collected wind speed prediction data. By using the predicted wind speed, the cut-in wind speed of the wind turbine, and the wind speed demarcation threshold, the power generation of the wind turbine under different operating modes within the predetermined time period, including whether to heat and dehumidify the power modules to be newly cut in and which modules are put into operation, can be predicted. Thus, an operating mode with less power generation loss of the wind turbine is selected, thereby reducing the power generation loss of the wind turbine and improving the utilization rate of the wind turbine.

[0048] The following describes how to select the operating mode. Figure 4 This is a flow chart of another embodiment of the control method for a multi-bus converter of a wind turbine generator set provided by the present application. Figure 4 and Figure 2 The difference is that Figure 2 Step S204 in the above example can be specifically broken down into Figure 4 Steps S2041 to S2044 in the above embodiment, or specifically as follows: Figure 4 Step S2045 in, or, specifically refined as Figure 4 Step S2046 in .

[0049] In step S2041 , when the predicted wind speed within the predetermined time period is greater than the wind speed threshold, the lost power generation, the first operation mode power generation, and the second operation mode power generation are predicted.

[0050] The lost power generation is the power generation lost during the heating and dehumidification period.

[0051] The power generation in the first operating mode is the power generation when the multi-bus converter is executing the first operating mode. Specifically, the power generation in the first operating mode includes the power generation of the wind turbine generator set with (N-M+X) power modules in operation during the remaining time (the predetermined time period minus the heating and dehumidification time period).

[0052] The second operation mode power generation is the power generation of the multi-bus converter in the second operation mode. The second operation mode power generation includes the power generation of the wind turbine generator set with (NM) power modules put into operation within a predetermined time period.

[0053] The total power output of the wind turbine generator set when (NM) power modules are operating varies with wind speed, and the total power output of the wind turbine generator set when (N-M+X) power modules are operating varies with wind speed. When the predicted wind speed within a predetermined time period is greater than the wind speed demarcation threshold, the total power output of the wind turbine generator set when (NM) power modules are operating is less than the total power output of the wind turbine generator set when (N-M+X) power modules are operating. That is, within the same time period, the power generation of the wind turbine generator set when (NM) power modules are operating is less than the power generation of the wind turbine generator set when (N-M+X) power modules are operating. However, if the power module to be newly switched in is heated and dehumidified, the wind turbine generator set does not generate power during the heating and dehumidification process. Therefore, it is necessary to combine the predicted loss of power generation, the power generation of the first operating mode, and the power generation of the second operating mode to determine the operating mode with less power generation loss.

[0054] Specifically, a first correspondence between a pre-determined wind speed and a first power and a second correspondence between a pre-determined wind speed and a second power can be obtained. The first power is the total power output by the wind turbine generator set within a predetermined time period when (N-M+X) power modules are put into operation. The second power is the total power output by the wind turbine generator set within a predetermined time period when (NM) power modules are put into operation. The first correspondence between the wind speed and the first power can be specifically implemented as a wind speed-power curve. The second correspondence between the wind speed and the second power can be specifically implemented as a wind speed-power curve. For example, Figure 3 As shown, the curve of the operation of (N-M+X) converter modules can represent the first corresponding relationship, and the curve of the operation of (NM) power modules can represent the second corresponding relationship.

[0055] The lost power generation is predicted based on the predicted wind speed within the predetermined time period, the preset total heating and dehumidification time period, and the second corresponding relationship. Specifically, the total power output of the wind turbine generator set when (NM) converter modules are in operation at multiple time points within the predetermined time period can be calculated based on the predicted wind speed within the predetermined time period. An integral model of the total power output of the wind turbine generator set when (NM) converter modules are in operation versus time can be established. Using this integral model, the power generation of the wind turbine generator set during the preset total heating and dehumidification time period, if heating and dehumidification were not performed, is calculated. This power generation is the lost power generation.

[0056] The power generation of the first operating mode is predicted based on the predicted wind speed within the predetermined time period, the preset total heating and dehumidification time period, and the first corresponding relationship. Specifically, the total power output by the wind turbine generator set when (N-M+X) converter modules are put into operation at multiple time points within the predetermined time period excluding the preset total heating and dehumidification time period can be obtained based on the predicted wind speed within the predetermined time period. An integral model of the total power output by the wind turbine generator set and time when (N-M+X) converter modules are put into operation can be established. The integral model can be used to calculate the power generation of the wind turbine generator set when (N-M+X) converter modules are put into operation within the predetermined time period excluding the preset total heating and dehumidification time period. This power generation is the power generation of the first operating mode.

[0057] The power generation in the second operating mode is predicted based on the predicted wind speed within the predetermined time period and the second corresponding relationship. Specifically, the total power output by the wind turbine generator set when (NM) converter modules are in operation at multiple time points within the predetermined time period can be calculated based on the predicted wind speed within the predetermined time period. An integral model of the total power output by the wind turbine generator set versus time when (NM) converter modules are in operation can be established. The integral model can be used to calculate the power generation of the wind turbine generator set when (NM) converter modules are in operation within the predetermined time period. This power generation is the power generation in the second operating mode.

[0058] In step S2042 , the power generation difference between the power generation in the first operation mode and the power generation in the second operation mode is calculated.

[0059] This power generation difference represents the excess power generated by the wind turbine when the multi-bus converter operates in the first operating mode compared to when the multi-bus converter operates in the second operating mode. Assuming the power generation in the first operating mode is W1 and the power generation in the second operating mode is W2, the power generation difference Wb = W1 - W2.

[0060] In step S2043 , when the lost power generation is less than the power generation difference, the multi-bus converter is controlled to execute the first operation mode.

[0061] The lost power generation is less than the power generation difference, that is, the lost power generation Ws < Wb. This indicates that the wind turbine's power generation under the first operating mode is sufficient to offset the power generation loss due to heating and dehumidification, with a surplus. Therefore, controlling the multi-bus converter to operate in the first operating mode can obtain more power from the wind turbine, reduce power generation losses, and improve wind turbine utilization.

[0062] In step S2044 , when the lost power generation is greater than or equal to the power generation difference, the multi-bus converter is controlled to execute the second operation mode.

[0063] If the lost power generation is greater than or equal to the power generation difference (i.e., lost power generation Ws ≥ Wb), this indicates that the additional power generation from the wind turbine in the first operating mode compared to when the multi-bus converter operates in the second operating mode is insufficient to offset the power generation loss due to heating and dehumidification. Therefore, controlling the multi-bus converter to operate in the second operating mode can increase the power generation from the wind turbine, reduce power generation losses, and improve wind turbine utilization.

[0064] Furthermore, if the predicted duration of the wind speed exceeding the wind speed threshold within the predetermined time period exceeds a preset time threshold, steps S2041 to S2044 may be executed. By executing steps S2041 to S2044 when the wind speed exceeds the wind speed threshold for a predetermined time period, that is, when the predicted wind speed exceeds the wind speed threshold for a long period of time within the predetermined time period, a sudden change in wind speed may be avoided, thereby improving the accuracy and reliability of the determination of the operating mode, further reducing the loss of power generation of the wind turbine generator set, and improving the utilization rate of the wind turbine generator set.

[0065] In step S2045 , when the predicted wind speed within the predetermined time period is less than the cut-in wind speed, the multi-bus converter is controlled to execute the first operation mode.

[0066] If the predicted wind speed within the predetermined time period is lower than the cut-in wind speed, the total power output of the wind turbine generator set is zero when (NM) power modules are in operation, and the total power output of the wind turbine generator set is zero when (N-M+X) power modules are in operation. Therefore, the wind turbine generator set's power generation is essentially zero within the predetermined time period. The predetermined time period can then be used to prepare for heating and dehumidifying the newly switched-in X power modules, i.e., to execute the first operating mode. In this case, there is no loss in the wind turbine generator set's power generation.

[0067] Furthermore, if the predicted wind speed within a predetermined time period is less than the cut-in wind speed for a duration greater than a preset time threshold, the multi-bus converter can be controlled to execute the first operating mode. By controlling the multi-bus converter to execute the first operating mode when the wind speed is less than the cut-in wind speed for a predetermined time period, i.e., when the predicted wind speed within the predetermined time period is less than the cut-in wind speed for a long period of time, the multi-bus converter can be controlled to avoid misjudgment of the operating mode due to sudden changes in wind speed, thereby improving the accuracy and reliability of operating mode determination, further reducing power generation losses of the wind turbine generator set, and increasing the utilization rate of the wind turbine generator set.

[0068] In step S2046 , when the predicted wind speed within the predetermined time period is within the range between the cut-in wind speed and the wind speed demarcation threshold, the multi-bus converter is controlled to execute the second operation mode.

[0069] The total power output of the wind generator set varies with wind speed when (NM) power modules are operating, and the total power output of the wind generator set varies with wind speed when (N-M+X) power modules are operating. When the wind speed is within the range between the cut-in wind speed and the wind speed demarcation threshold, the total power output of the wind generator set when (NM) power modules are operating is greater than the total power output of the wind generator set when (N-M+X) power modules are operating, that is, the power generation of the wind generator set when (NM) power modules are operating is greater than the power generation of the wind generator set when (N-M+X) power modules are operating. When the power generation of the wind generator set when (NM) power modules are operating is greater than the power generation of the wind generator set when (N-M+X) power modules are operating, the first operating mode loses more power than the second operating mode. Therefore, in this case, the multi-bus converter is controlled to execute the second operating mode to reduce the power generation loss of the wind generator set and improve the utilization rate of the wind generator set.

[0070] Furthermore, if the predicted wind speed within the predetermined time period remains between the cut-in wind speed and the wind speed demarcation threshold for a period longer than a preset time threshold, the multi-bus converter can be controlled to execute the second operating mode. By controlling the multi-bus converter to execute the second operating mode when the wind speed remains between the cut-in wind speed and the wind speed demarcation threshold for a certain period of time, that is, when the predicted wind speed within the predetermined time period remains between the cut-in wind speed and the wind speed demarcation threshold for a long period of time, this avoids misjudgment of the operating mode caused by sudden changes in wind speed, improves the accuracy and reliability of operating mode determination, further reduces power generation losses of the wind turbine generator set, and improves the utilization rate of the wind turbine generator set.

[0071] In some examples, the process of determining the operating mode of the multi-bus converter may be performed in a loop. Figure 5 This is a flow chart of another embodiment of the control method for a multi-bus converter of a wind turbine generator set provided by the present application. Figure 5 and Figure 2 The difference is that Figure 5 The control method of the multi-bus converter of the wind turbine generator set shown may further include step S205 , and when certain conditions are met, the method may jump to step S203 and execute steps S203 to S205 in a loop.

[0072] In step S205 , it is determined whether the duration of heating and dehumidifying the power module to be newly switched in reaches a preset total heating and dehumidifying duration.

[0073] If the time for heating and dehumidifying the power module to be newly switched on does not reach the preset total heating and dehumidification time, jump to step S203 and execute steps S203 to S205 until the time for heating and dehumidifying the power module to be newly switched on reaches the preset total heating and dehumidification time.

[0074] When the heating and dehumidification time for a newly switched-in power module reaches the preset total heating and dehumidification time, the heated and dehumidified power module can be put into operation, and (N-M+X) power modules can be kept in operation, and the wind turbine generator set can be started. The timer can be started when the heating and dehumidification of the newly switched-in power module is started to calculate the heating and dehumidification time.

[0075] The preset total heating and dehumidification time can be determined based on specific scenarios and needs and is not limited here. The preset total heating and dehumidification time should be greater than or equal to the time it takes for heating and dehumidification to reduce the humidity of the power module to below the safe humidity level. For example, the preset heating time can be 2 hours.

[0076] The present application also provides a control device for a multi-bus converter of a wind turbine generator set. The multi-bus converter includes N busbars, each busbar is connected to a power module, and N is an integer greater than 1. Figure 6 This is a structural diagram of an embodiment of a control device for a multi-bus converter of a wind turbine generator set provided by this application. Figure 6 As shown, the control device 300 of the multi-bus converter of the wind turbine generator set may include a fault removal module 301 , a data acquisition module 302 , a wind speed prediction module 303 and an operation mode determination module 304 .

[0077] The fault removal module 301 may be used to remove the faulty power module when a power module connected to any busbar of the multi-busbar converter fails.

[0078] The data acquisition module 302 may be used to acquire the cut-in wind speed and wind speed threshold of the wind turbine generator set.

[0079] The wind speed threshold is the wind speed at which the total power output of the wind turbine generator set when (NM) power modules are in operation is equal to the total power output of the wind turbine generator set when (N-M+X) power modules are in operation. M is the number of faulty power modules removed. X is the number of power modules to be newly added.

[0080] The wind speed prediction module 303 may be used to predict the wind speed within a predetermined time period based on the collected wind speed prediction data.

[0081] The operation mode determination module 304 may be configured to determine the operation mode of the multi-bus converter using the predicted wind speed within a predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold.

[0082] The operation mode includes whether to heat and dehumidify the power modules to be newly switched on and the power modules to be put into operation within a predetermined time period.

[0083] In some examples, the operating mode includes a first operating mode and a second operating mode.

[0084] The first operating mode includes heating and dehumidifying the power modules to be newly switched in for a predetermined period of time, and then switching the heated and dehumidified power modules into operation, keeping (N-M+X) power modules in operation. The second operating mode includes not heating and dehumidifying the power modules to be newly switched in for a predetermined period of time, and keeping (NM) power modules that have not experienced any faults in operation.

[0085] In an embodiment of the present application, in the event that a power module connected to the busbar of a multi-bus converter fails, the failed power module is removed. The power generation of a wind turbine is related to the wind speed and the number of operating power modules. The wind speed within a predetermined time period is predicted based on the collected wind speed prediction data. By using the predicted wind speed, the cut-in wind speed of the wind turbine, and the wind speed demarcation threshold, the power generation of the wind turbine under different operating modes within the predetermined time period, including whether to heat and dehumidify the power modules to be newly cut in and which modules are put into operation, can be predicted. Thus, an operating mode with less power generation loss of the wind turbine is selected, thereby reducing the power generation loss of the wind turbine and improving the utilization rate of the wind turbine.

[0086] In some examples, the above-mentioned operating mode determination module 304 can be used to: predict the lost power generation, the first operating mode power generation and the second operating mode power generation when the predicted wind speed within a predetermined time period is greater than the wind speed boundary threshold, the lost power generation is the power generation lost during the heating and dehumidification time period, the first operating mode power generation is the power generation of the multi-bus converter executing the first operating mode, and the second operating mode power generation is the power generation of the multi-bus converter executing the second operating mode; calculate the power generation difference between the first operating mode power generation and the second operating mode power generation; when the lost power generation is less than the power generation difference, control the multi-bus converter to execute the first operating mode; when the lost power generation is greater than or equal to the power generation difference, control the multi-bus converter to execute the second operating mode.

[0087] Specifically, the above-mentioned operating mode determination module 304 can be used to: obtain a first correspondence between a pre-determined wind speed and a first power and a second correspondence between a pre-determined wind speed and a second power, the first power being the total power output by the wind turbine generator set within a predetermined time when (N-M+X) power modules are put into operation, and the second power being the total power output by the wind turbine generator set within a predetermined time when (NM) power modules are put into operation; predicting the lost power generation based on the predicted wind speed within the predetermined time, the preset total heating and dehumidification time, and the second correspondence; predicting the power generation of the first operating mode based on the predicted wind speed within the predetermined time, the preset total heating and dehumidification time, and the first correspondence; predicting the power generation of the second operating mode based on the predicted wind speed within the predetermined time and the second correspondence.

[0088] In some examples, the operation mode determination module 304 may be configured to control the multi-bus converter to execute the first operation mode when the predicted wind speed within a predetermined time period is less than the cut-in wind speed.

[0089] In some examples, when the predicted wind speed within the predetermined time period is within a range between the cut-in wind speed and the wind speed demarcation threshold, the multi-bus converter is controlled to execute the second operation mode.

[0090] Figure 7 This is a structural schematic diagram of another embodiment of the control device for a multi-bus converter of a wind turbine generator set provided by the present application. Figure 7 and Figure 6 The difference is that the control device 300 of the wind turbine generator multi-bus converter may further include a control module 305 .

[0091] The control module 305 can be used to control the wind speed prediction module 303 to predict the wind speed within the predetermined time period again based on the collected wind speed prediction data when the time period for heating and dehumidifying the power module to be newly switched on does not reach the preset total heating and dehumidification time period, so that the operation mode determination module 304 uses the predicted wind speed within the predetermined time period, the cut-in wind speed of the wind turbine generator set and the wind speed boundary threshold to determine the operation mode of the multi-bus converter.

[0092] The embodiment of the present application also provides a main controller. Figure 8 This is a schematic diagram of the structure of an embodiment of the main controller provided by this application. Figure 8 As shown, the main controller 400 includes a memory 401 , a processor 402 , and a computer program stored in the memory 401 and executable on the processor 402 .

[0093] In an example, the processor 402 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0094] The memory 401 may include a read-only memory (ROM), a random access memory (RAM), a magnetic disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical or other physical / tangible memory storage device. Therefore, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., a memory device) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the control method for a multi-bus converter of a wind turbine generator system according to the present application.

[0095] The processor 402 runs a computer program corresponding to the executable program code by reading the executable program code stored in the memory 401 , so as to implement the control method of the multi-bus converter of the wind turbine generator set in the above embodiment.

[0096] In one example, the main controller 400 may further include a communication interface 403 and a bus 404. Figure 8 As shown, the memory 401 , the processor 402 , and the communication interface 403 are connected via a bus 404 and communicate with each other.

[0097] The communication interface 403 is mainly used to implement communication between the modules, devices, units and / or equipment in the embodiment of the present application. Input devices and / or output devices can also be connected through the communication interface 403.

[0098] The bus 404 includes hardware, software, or both, and couples the components of the main controller 400 to each other. By way of example, and not limitation, the bus 404 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industrial Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a MicroChannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or a combination of two or more of the above. Where appropriate, the bus 404 may include one or more buses. Although embodiments herein describe and illustrate a particular bus, this application contemplates any suitable bus or interconnect.

[0099] The present application also provides a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the control method for the multi-bus converter of the wind turbine generator set described in the above embodiment can be implemented, and the same technical effect can be achieved. To avoid repetition, the above-mentioned computer-readable storage medium may include a non-transitory computer-readable storage medium, such as a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc., which is not limited here.

[0100] It should be understood that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the device embodiment, main controller embodiment, and computer-readable storage medium embodiment, the relevant parts can be referred to the description part of the method embodiment. This application is not limited to the specific steps and structures described above and shown in the figures. Those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of this application. In addition, for the sake of brevity, a detailed description of known method technologies is omitted here.

[0101] Aspects of the present application have been described above with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine so that these instructions executed via the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. This processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit. It is also understood that each box in the block diagram and / or the flowchart and the combination of the boxes in the block diagram and / or the flowchart can also be implemented by the dedicated hardware that performs the specified function or action, or can be implemented by the combination of dedicated hardware and computer instructions.

[0102] Those skilled in the art should understand that the above embodiments are illustrative rather than restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on a study of the drawings, the specification and the claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other devices or steps; the quantifier "one" does not exclude a plurality; the terms "first" and "second" are used to identify names rather than to indicate any specific order. Any figure marks in the claims should not be understood as limiting the scope of protection. The functions of multiple parts appearing in the claims can be implemented by a separate hardware or software module. The fact that certain technical features appear in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A control method for a multi-bus converter of a wind turbine generator set, characterized in that: The multi-busbar converter includes N busbars, each busbar is connected to a power module, and N is an integer greater than 1. The method includes: When a power module connected to any busbar of the multi-busbar converter fails, disconnecting the failed power module; Obtaining a cut-in wind speed and a wind speed threshold for the wind turbine generator set. The wind speed threshold comprises the wind speed at which the total power output of the wind turbine generator set when (NM) power modules are in operation is equal to the total power output of the wind turbine generator set when (N-M+X) power modules are in operation, where M is the number of faulty power modules to be cut off, and X is the number of power modules to be newly cut in. Predict the wind speed within a predetermined time period based on the collected wind speed forecast data; The operating mode of the multi-bus converter is determined by using the predicted wind speed within the predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold, so as to select the operating mode with less power generation loss of the wind turbine generator set for execution. The operating mode includes whether to heat and dehumidify the power modules to be newly cut in and put the power modules into operation within the predetermined time period.

2. The control method of a multi-bus converter for a wind turbine generator set according to claim 1, characterized in that: The operating mode includes a first operating mode and a second operating mode; The first operation mode includes heating and dehumidifying the power modules to be newly switched in within a predetermined time period, and switching the heated and dehumidified power modules into operation, so as to keep (N-M+X) power modules in operation; The second operation mode includes not heating or dehumidifying the power module to be newly switched in for a predetermined period of time, and keeping (NM) power modules that have not failed in operation.

3. The control method of a multi-bus converter for a wind turbine generator set according to claim 2, characterized in that: The determining the operation mode of the multi-bus converter by using the predicted wind speed within the predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold value includes: When the predicted wind speed within the predetermined time period is greater than the wind speed demarcation threshold, the lost power generation, the first operating mode power generation, and the second operating mode power generation are predicted, where the lost power generation is the power generation lost within the heating and dehumidification time period, the first operating mode power generation is the power generation when the multi-bus converter performs the first operating mode, and the second operating mode power generation is the power generation when the multi-bus converter performs the second operating mode; Calculating a power generation difference between a power generation in the first operating mode and a power generation in the second operating mode; When the lost power generation is less than the power generation difference, controlling the multi-bus converter to execute the first operation mode; When the lost power generation is greater than or equal to the power generation difference, the multi-bus converter is controlled to execute the second operation mode.

4. The control method of a multi-bus converter for a wind turbine generator set according to claim 3, characterized in that: The predicted lost power generation, the first operation mode power generation and the second operation mode power generation include: Obtaining a first correspondence between a pre-determined wind speed and a first power and a second correspondence between a pre-determined wind speed and a second power, the first power being the total power output by the wind generator set within the predetermined duration when (N-M+X) power modules are put into operation, and the second power being the total power output by the wind generator set within the predetermined duration when (N-M) power modules are put into operation; Predicting the lost power generation according to the predicted wind speed within the predetermined time period, the preset total heating and dehumidification time period, and the second corresponding relationship; Predicting the power generation of the first operating mode based on the predicted wind speed within the predetermined time period, the preset total heating and dehumidification time period, and the first corresponding relationship; The power generation of the second operating mode is predicted based on the predicted wind speed within the predetermined time period and the second corresponding relationship.

5. The control method of a multi-bus converter for a wind turbine generator set according to claim 2, characterized in that: The determining the operation mode of the multi-bus converter by using the predicted wind speed within the predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold value includes: When the predicted wind speed within the predetermined time period is less than the cut-in wind speed, the multi-bus converter is controlled to execute the first operation mode.

6. The control method of a multi-bus converter for a wind turbine generator set according to claim 2, characterized in that: The determining the operation mode of the multi-bus converter by using the predicted wind speed within the predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold value includes: When the predicted wind speed within the predetermined time period is within a range between the cut-in wind speed and the wind speed demarcation threshold, the multi-bus converter is controlled to execute a second operation mode.

7. The control method for a multi-bus converter of a wind turbine generator set according to any one of claims 1 to 6, characterized in that: Also includes: When the time for heating and dehumidifying the power module to be newly switched on does not reach the preset total heating and dehumidification time, the wind speed within the predetermined time is predicted again based on the collected wind speed prediction data, and the predicted wind speed within the predetermined time, the cut-in wind speed of the wind turbine generator set and the wind speed boundary threshold are used to determine the operating mode of the multi-bus converter.

8. A control device for a multi-bus converter of a wind turbine generator set, characterized in that: The multi-busbar converter includes N busbars, each busbar is connected to a power module, and N is an integer greater than 1. The device includes: A fault removal module, configured to remove the faulty power module when a power module connected to any bus of the multi-bus converter fails; a data acquisition module, configured to acquire a cut-in wind speed and a wind speed threshold for the wind turbine generator set, wherein the wind speed threshold comprises the wind speed at which the total power output by the wind turbine generator set when (NM) power modules are in operation is equal to the total power output by the wind turbine generator set when (N-M+X) power modules are in operation, where M is the number of faulty power modules to be cut off, and X is the number of power modules to be newly cut in; A wind speed prediction module is used to predict the wind speed within a predetermined time period based on the collected wind speed prediction data; An operating mode determination module is used to determine the operating mode of the multi-bus converter using the predicted wind speed within the predetermined time period, the cut-in wind speed of the wind turbine generator set, and the wind speed demarcation threshold, so as to select the operating mode with less power generation loss of the wind turbine generator set for execution. The operating mode includes whether to heat and dehumidify the power modules to be newly cut in and put the power modules into operation within the predetermined time period.

9. A main controller, characterized in that: include: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, the control method for the multi-bus converter of a wind turbine generator set according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer program instructions, and when the computer program instructions are executed by a processor, the control method for a multi-bus converter of a wind turbine generator set according to any one of claims 1 to 7 is implemented.

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