Converter heat dissipation system and control method thereof, converter and wind turbine generator set

Abstract

The present disclosure relates to a converter heat dissipation system and a control method thereof, a converter and a wind turbine generator set. The control method comprises: obtaining the temperature of the cooling medium in the radiator of the converter heat dissipation system and the ambient temperature; in response to the temperature of the cooling medium in the radiator being higher than the ambient temperature, determining whether the ambient temperature is between a first ambient temperature threshold and a second ambient temperature threshold, wherein the first ambient temperature threshold is lower than the second ambient temperature threshold; in response to the ambient temperature being between the first ambient temperature threshold and the second ambient temperature threshold, controlling the start-up temperature of the heat dissipation fan of the converter heat dissipation system to change linearly with the change of the ambient temperature. By adopting the present disclosure, it is possible to achieve rational control of the heat dissipation fan in the converter heat dissipation system to reduce the operating time of the heat dissipation fan, thereby reducing the self-consumption of the wind turbine generator set to increase the power generation of the wind turbine generator set, and at the same time increase the service life of the heat dissipation fan.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of converter heat dissipation, and more specifically, relates to a converter heat dissipation system and a control method thereof, a converter, and a wind turbine generator set. Background Art

[0002] Usually, the inverter of a megawatt-class unit is a full-power water-cooled inverter, and the main power devices are cooled by water. The inverter external cooling radiator is an important part of the entire cooling system. The heat generated by the inverter during operation will be transferred to the atmosphere through the external cooling radiator, so the heat exchange power of the radiator must meet the maximum heating power of the inverter. The external cooling radiator generally adopts the water-to-air heat exchange type. The water carrying heat enters the radiator core, and the heat is exchanged with the air through the forced air cooling of the cooling fan, and the heat is dissipated into the air.

[0003] Traditionally, the start of the cooling fan of the external cooling radiator is determined according to the temperature of the cooling medium of the converter. When the temperature reaches a certain design value, the external cooling radiator will start a corresponding number of cooling fans to ensure that the temperature of the cooling medium of the converter is controlled within a certain range. However, such a control strategy has defects. For example, when the temperature is high in summer, when the wind turbine generator set is in a low-power operation state or standby state, in theory, the external cooling radiator does not need to start the cooling fan or only needs to start a small number of cooling fans to meet the heat dissipation needs of the converter. However, due to the high temperature of the external environment, the temperature of the cooling medium is also high. At this time, the cooling fan of the external cooling radiator will be started ineffectively, resulting in an increase in the self-consumption of the generator set and a decrease in power generation, thereby reducing the power generation revenue generated by the generator set. Summary of the invention

[0004] In order to solve the above problems, the present disclosure proposes a converter heat dissipation system and a control method thereof, a converter and a wind turbine generator set.

[0005] According to one aspect of the present disclosure, a control method for a converter heat dissipation system is provided, and the control method may include: obtaining the temperature of a cooling medium in a radiator of the converter heat dissipation system and the ambient temperature; in response to the temperature of the cooling medium in the radiator being higher than the ambient temperature, determining whether the ambient temperature is between a first ambient temperature threshold and a second ambient temperature threshold, wherein the first ambient temperature threshold is lower than the second ambient temperature threshold; in response to the ambient temperature being between the first ambient temperature threshold and the second ambient temperature threshold, controlling the starting temperature of a heat dissipation fan of the converter heat dissipation system to change linearly with changes in the ambient temperature.

[0006] Optionally, the control method may further include: in response to the temperature of the cooling medium in the radiator being not higher than the ambient temperature, disabling the heat dissipation fan.

[0007] Optionally, the control method may further include: in response to the ambient temperature being lower than a first ambient temperature threshold or the ambient temperature being higher than a second ambient temperature threshold, controlling the start-up temperature of the heat dissipation fan to be a fixed value.

[0008] Optionally, the startup temperature of the heat dissipation fan at the first ambient temperature threshold may be lower than the startup temperature of the heat dissipation fan at the second ambient temperature threshold.

[0009] Optionally, the radiator may be an external cooling radiator, and the heat dissipation fan may include a plurality of heat dissipation fans.

[0010] Optionally, the control method may further include: setting a plurality of start-up temperatures corresponding to the number of the plurality of heat dissipation fans, and randomly allocating the plurality of start-up temperatures to the plurality of heat dissipation fans.

[0011] Optionally, the interval between the startup temperatures of the heat dissipation fans at the first ambient temperature threshold may be greater than the interval between the startup temperatures of the heat dissipation fans at the second ambient temperature threshold.

[0012] Optionally, the maximum startup temperature of the startup temperatures of the heat dissipation fans at the second ambient temperature threshold may be lower than the high temperature boundary temperature of the cooling medium in the radiator, and the second ambient temperature threshold may be lower than the high temperature boundary temperature of the ambient temperature.

[0013] Optionally, the first ambient temperature threshold may be lower than a minimum start-up temperature among start-up temperatures of each heat dissipation fan at the first ambient temperature threshold.

[0014] According to another aspect of the present disclosure, a converter heat dissipation system is provided, which may include: a circulation pump, whose outlet is connected to the water inlet of the converter via a pipeline; a radiator, whose water inlet is connected to the water outlet of the converter via a pipeline, and whose water outlet is connected to the inlet of the circulation pump via a pipeline; a temperature sensor, used to measure the temperature of the cooling medium in the radiator and the ambient temperature; a heat dissipation fan, used to cool the cooling medium in the radiator by air cooling; a controller, configured to: obtain the temperature of the cooling medium in the radiator and the ambient temperature; in response to the temperature of the cooling medium in the radiator being higher than the ambient temperature, determine whether the ambient temperature is between a first ambient temperature threshold and a second ambient temperature threshold, wherein the first ambient temperature threshold is lower than the second ambient temperature threshold; in response to the ambient temperature being between the first ambient temperature threshold and the second ambient temperature threshold, control the starting temperature of the heat dissipation fan to change linearly with the change of the ambient temperature.

[0015] Optionally, the controller may be further configured to: in response to the temperature of the cooling medium in the radiator being not higher than the ambient temperature, disable the cooling fan.

[0016] Optionally, the controller may be further configured to: in response to the ambient temperature being lower than a first ambient temperature threshold or the ambient temperature being higher than a second ambient temperature threshold, control the start-up temperature of the heat dissipation fan to be a fixed value.

[0017] Optionally, the startup temperature of the heat dissipation fan at the first ambient temperature threshold may be lower than the startup temperature of the heat dissipation fan at the second ambient temperature threshold.

[0018] Optionally, the radiator may be an external cooling radiator, and the heat dissipation fan may include a plurality of heat dissipation fans.

[0019] Optionally, the controller may be further configured to: set a number of startup temperatures corresponding to the number of the plurality of heat dissipation fans, and randomly allocate the plurality of startup temperatures to the plurality of heat dissipation fans.

[0020] Optionally, the interval between the startup temperatures of the heat dissipation fans at the first ambient temperature threshold may be greater than the interval between the startup temperatures of the heat dissipation fans at the second ambient temperature threshold.

[0021] Optionally, the maximum startup temperature of the startup temperatures of the heat dissipation fans at the second ambient temperature threshold may be lower than the high temperature boundary temperature of the cooling medium in the radiator, and the second ambient temperature threshold may be lower than the high temperature boundary temperature of the ambient temperature.

[0022] Optionally, the first ambient temperature threshold may be lower than a minimum start-up temperature among start-up temperatures of each heat dissipation fan at the first ambient temperature threshold.

[0023] According to another aspect of the present disclosure, a converter is provided. The converter may include the converter heat dissipation system as described above.

[0024] According to yet another aspect of the present disclosure, a wind turbine generator set is provided. The wind turbine generator set may include the converter as described above.

[0025] By adopting the present disclosure, it is possible to achieve rational control of the cooling fan in the converter cooling system to reduce the operating time of the cooling fan, thereby reducing the self-consumption of power of the wind turbine generator set to increase the power generation of the wind turbine generator set, and at the same time prolong the service life of the cooling fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or other objects and advantages of the present disclosure will become more apparent through the following description of embodiments in conjunction with the accompanying drawings, in which:

[0027] Figure 1 is a flow chart showing a control method of a converter heat dissipation system according to an exemplary embodiment of the present disclosure;

[0028] Figure 2 is a flow chart showing a method for determining a startup scheme of a heat dissipation fan according to an exemplary embodiment of the present disclosure;

[0029] Figure 3 is a flow chart showing a method for randomly starting and shutting down a cooling fan according to an exemplary embodiment of the present disclosure;

[0030] Figure 4 is a graph showing the change of the startup temperature of the heat dissipation fan relative to the ambient temperature according to an exemplary embodiment of the present disclosure;

[0031] Figure 5 is a block diagram illustrating a converter heat dissipation system according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0032] Exemplary embodiments of the present disclosure will now be described in detail, examples of which are shown in the accompanying drawings, wherein like reference numerals refer to like parts. The embodiments will be described below by referring to the drawings in order to explain the present disclosure.

[0033] Figure 1 is a flow chart illustrating a control method of a converter heat dissipation system according to an exemplary embodiment of the present disclosure.

[0034] Reference Figure 1 In step S101, the temperature of the cooling medium in the radiator of the converter cooling system and the ambient temperature are obtained. In one example, the temperature of the cooling medium in the radiator can be obtained by a temperature sensor disposed at the water inlet circuit of the cooling medium of the radiator, and the ambient temperature can be obtained by a temperature sensor disposed outside the wind turbine generator set. Here, the radiator can be, but is not limited to, an external cooling radiator.

[0035] In step S102, it is determined whether the temperature of the cooling medium in the radiator is higher than the ambient temperature. Generally, if the temperature of the cooling medium in the radiator is higher than the ambient temperature, it can be determined that the wind turbine generator set is not in a standby state or a low power state; if the temperature of the cooling medium in the radiator is not higher than the ambient temperature, the wind turbine generator set may be in a low power state or a standby state. If it is determined in step S102 that the temperature of the cooling medium in the radiator is higher than the ambient temperature, the process proceeds to step S103. If it is determined in step S102 that the temperature of the cooling medium in the radiator is not higher than the ambient temperature, the process proceeds to step S104, in which the cooling fan of the converter cooling system can be disabled. Through such a control strategy, it is possible to avoid starting the cooling fan when the wind turbine generator set is in a low power state or a standby state, thereby reducing unnecessary self-consumption of electricity of the wind turbine generator set, and the reduction of self-consumption of electricity also means an increase in the power generation of the wind turbine generator set.

[0036] In step S103, it can be determined whether the ambient temperature is between a first ambient temperature threshold and a second ambient temperature threshold, wherein the first ambient temperature threshold is lower than the second ambient temperature threshold. Here, the first ambient temperature threshold and the second ambient temperature threshold can be set by those skilled in the art as needed. If it is determined in step S103 that the ambient temperature is between the first ambient temperature threshold and the second ambient temperature threshold, the process proceeds to step S105, otherwise the process proceeds to step S106.

[0037] In step S105, the starting temperature of the cooling fan can be controlled to change linearly with the change of the ambient temperature (e.g. Figure 4 In response to the ambient temperature being lower than the first ambient temperature threshold value Ta or the ambient temperature being higher than the second ambient temperature threshold value, the start-up temperature of the cooling fan may be controlled to be a fixed value in step S106 (i.e., the start-up temperature of the cooling fan does not change with the change of the ambient temperature). For example, regarding the setting of the fixed value, please refer to Figure 4 Here, the starting temperature of the cooling fan at the first ambient temperature threshold may be lower than the starting temperature of the cooling fan at the second ambient temperature threshold. Through such a control strategy, the starting scheme of the cooling fan (including the fixed value starting scheme corresponding to step S106 and the variable value starting scheme corresponding to step S105) can be adaptively adjusted according to the ambient temperature.

[0038] Figure 2 is a flow chart illustrating a method for determining a startup scheme of a heat dissipation fan according to an exemplary embodiment of the present disclosure.

[0039] Reference Figure 2In step S201, the converter is started and operated. Subsequently, it can be determined in step S202 whether the ambient temperature is higher than a first ambient temperature threshold.

[0040] If it is determined in step S202 that the ambient temperature is higher than the first ambient temperature threshold, then proceed to step S203, otherwise proceed to step S204. In step S204, the startup temperature of the heat dissipation fan can be controlled to be a first fixed value, where the first fixed value can be a fixed heat dissipation fan startup temperature set for the case where the ambient temperature is not higher than the first ambient temperature threshold or a plurality of fixed heat dissipation fan startup temperatures different from each other (i.e., each heat dissipation fan can be set with a different first fixed value). For example, in an example including a plurality of heat dissipation fans, when the ambient temperature is not higher than the first ambient temperature threshold, a corresponding fixed startup temperature can be set for each heat dissipation fan, and each of these fixed startup temperatures does not change with the change of the ambient temperature. Subsequently, it can be determined in step S207 whether the temperature of the cooling medium in the radiator is lower than the startup temperature of the heat dissipation fan by a first specific value (e.g., 2 degrees Celsius or other temperature values). If it is determined in step S207 that the temperature of the cooling medium in the radiator is lower than the startup temperature of the heat dissipation fan by a first specific value, then proceed to step S210 to turn off the heat dissipation fan. In an example including a plurality of heat dissipation fans, step S207 may be performed for each heat dissipation fan to determine whether the heat dissipation fan needs to be turned off. If it is determined in step S207 that the temperature of the cooling medium in the radiator is not lower than the start-up temperature of the heat dissipation fan by a first specific value, step S207 is continued until the temperature of the cooling medium in the radiator decreases to be lower than the start-up temperature of the heat dissipation fan by a first specific value.

[0041] In step S203, it can be determined whether the ambient temperature is higher than the second ambient temperature threshold. If it is determined in step S203 that the ambient temperature is higher than the second ambient temperature threshold, proceed to step S205, otherwise proceed to step S206. In step S205, the startup temperature of the heat dissipation fan can be controlled to be a second fixed value, where the second fixed value can be a fixed heat dissipation fan startup temperature set for the case where the ambient temperature is higher than the second ambient temperature threshold or a plurality of fixed heat dissipation fan startup temperatures that are different from each other (i.e., each heat dissipation fan can be set with a different second fixed value). For example, in an example including a plurality of heat dissipation fans, when the ambient temperature is higher than the second ambient temperature threshold, a corresponding fixed startup temperature can be set for each heat dissipation fan, and each of these fixed startup temperatures does not change with changes in the ambient temperature. In addition, in this example, the interval between the start-up temperatures of each heat dissipation fan at the first ambient temperature threshold (e.g., 3 degrees Celsius or 4 degrees Celsius) may be greater than the interval between the start-up temperatures of each heat dissipation fan at the second ambient temperature threshold (e.g., 1 degree Celsius). By setting the start-up temperature in this way, the heat dissipation fan can be started more sensitively in the high temperature range to avoid the temperature of the cooling medium in the radiator exceeding the cooling medium high temperature boundary. After executing step S205, step S209 may be executed to determine whether the temperature of the cooling medium in the radiator is lower than the start-up temperature of the heat dissipation fan by a third specific value (e.g., 2 degrees Celsius or other temperature values). If it is determined in step S209 that the temperature of the cooling medium in the radiator is lower than the start-up temperature of the heat dissipation fan by a third specific value, step S212 may be executed to turn off the heat dissipation fan. Similarly, in an example including multiple heat dissipation fans, step S209 may be executed for each heat dissipation fan to determine whether the heat dissipation fan needs to be turned off. If it is determined in step S209 that the temperature of the cooling medium in the radiator is not lower than the start temperature of the cooling fan by a third specific value, step S209 is continued until the temperature of the cooling medium in the radiator decreases to be lower than the start temperature of the cooling fan by a third specific value.

[0042] In response to determining that the ambient temperature is not higher than the second ambient temperature threshold in step S203, the startup temperature of the heat dissipation fan may be controlled to change linearly with the change of the ambient temperature in step S206. For example, in an example including multiple heat dissipation fans, when the ambient temperature is between the first ambient temperature threshold and the second ambient temperature threshold, multiple startup temperatures may be set for the multiple heat dissipation fans, each of the multiple startup temperatures changes linearly with the change of the ambient temperature, and as described above, the interval between the startup temperatures of the respective heat dissipation fans at the first ambient temperature threshold (e.g., 3 degrees Celsius or 4 degrees Celsius) may be greater than the interval between the startup temperatures of the respective heat dissipation fans at the second ambient temperature threshold (e.g., 1 degree Celsius), so in this case, the slope of each startup temperature curve in the multiple startup temperature curves is different. And then, it may be determined in step S208 whether the temperature of the cooling medium in the radiator is lower than the startup temperature of the heat dissipation fan by a second specific value (e.g., 2 degrees Celsius or other temperature values). If it is determined in step S208 that the temperature of the cooling medium in the radiator is lower than the start-up temperature of the cooling fan by a second specific value, step S211 may be executed to turn off the cooling fan. Similarly, in an example including a plurality of cooling fans, step S208 may be executed for each cooling fan to determine whether the cooling fan needs to be turned off. If it is determined in step S208 that the temperature of the cooling medium in the radiator is not lower than the start-up temperature of the cooling fan by a second specific value, step S208 is continued until the temperature of the cooling medium in the radiator is reduced to a second specific value lower than the start-up temperature of the cooling fan.

[0043] It should be understood by those skilled in the art that the step of determining whether the temperature of the cooling medium in the radiator is lower than the starting temperature of the cooling fan by a specific value (e.g., step S207, step S208, or step S209) may be performed continuously, or the step of determining whether the temperature of the cooling medium in the radiator is lower than the starting temperature of the cooling fan by a specific value (e.g., step S207, step S208, or step S209) may be performed periodically. Furthermore, the first specific value, the second specific value, and the third specific value may be the same value or different values ​​from each other.

[0044] Figure 3 is a flow chart illustrating a method for randomly starting and shutting down a cooling fan according to an exemplary embodiment of the present disclosure.

[0045] Reference Figure 3 In step S301, the converter is started. Subsequently, it can be determined in step S302 whether the temperature of the cooling medium in the radiator included in the converter cooling system is higher than the first startup temperature threshold. If it is determined in step S302 that the temperature of the cooling medium in the radiator is not higher than the first startup temperature threshold, the process proceeds to step S303, so that the cooling fan is not started.

[0046] If it is determined in step S302 that the temperature of the cooling medium in the radiator is higher than the first start-up temperature threshold, proceed to step S304. In step S304, one of the plurality of cooling fans may be randomly started. That is, for the same ambient temperature, the plurality of start-up temperatures corresponding to the plurality of cooling fans are randomly assigned, for example, cooling fan No. 1 is assigned to the lowest start-up temperature in the current control process, and may be randomly assigned to the highest start-up temperature in the subsequent control process. After one of the plurality of cooling fans has been started, step S305 may be executed to determine whether the temperature of the cooling medium in the radiator is lower than the first start-up temperature threshold by a first specific value (e.g., 2 degrees Celsius or other temperature value), and step S306 may be executed to determine whether the temperature of the cooling medium in the radiator is higher than the second start-up temperature threshold. If it is determined in step S305 that the temperature of the cooling medium in the radiator is lower than the first start-up temperature threshold by a first specific value, step S314 may be executed to shut down the started cooling fan, otherwise step S305 may continue to be executed continuously or periodically.

[0047] If it is determined in step S306 that the temperature of the cooling medium in the radiator is higher than the second start-up temperature threshold, the second cooling fan is randomly started. After the second cooling fan is randomly started, step S308 may be performed to determine whether the temperature of the cooling medium in the radiator is lower than the second start-up temperature threshold by a second specific value (e.g., 2 degrees Celsius or other temperature value), and step S309 may be performed to determine whether the temperature of the cooling medium in the radiator is higher than the third start-up temperature threshold. If it is determined in step S308 that the temperature of the cooling medium in the radiator is lower than the second start-up temperature threshold by a second specific value, step S313 may be performed to randomly shut down one of the started cooling fans, otherwise step S308 may continue to be performed continuously or periodically.

[0048] If it is determined in step S309 that the temperature of the cooling medium in the radiator is higher than the third startup temperature threshold, the third cooling fan is started. After starting the third cooling fan, step S311 may be executed to determine whether the temperature of the cooling medium in the radiator is lower than the third startup temperature threshold by a third specific value (e.g., 2 degrees Celsius or other temperature value). If it is determined in step S311 that the temperature of the cooling medium in the radiator is lower than the third startup temperature threshold by a third specific value, step S312 may be executed to randomly shut down one of the started cooling fans, otherwise step S311 may continue to be executed continuously or periodically. And after executing step S312, step S308 is executed to determine whether the temperature of the cooling medium in the radiator continues to decrease to a second specific value lower than the second startup temperature. Similarly, after executing step S313, step S305 may be executed to determine whether the temperature of the cooling medium in the radiator continues to decrease to a first specific value lower than the first startup temperature.

[0049] It should be understood that reference Figure 3 The method for randomly starting and shutting down a cooling fan can be applied not only to the case where the ambient temperature is between the first ambient temperature threshold and the second ambient temperature threshold, but also to the case where the ambient temperature is lower than the first ambient temperature threshold or higher than the second ambient temperature threshold (wherein the first ambient temperature threshold is lower than the second ambient temperature threshold). In addition, the first specific value, the second specific value, and the third specific value can be the same value or different values ​​from each other.

[0050] In addition, although Figure 3 The example shown is a case where three cooling fans are included, but it should be understood that Figure 3 The method shown can be applied to a case where two or more cooling fans are included, that is, steps similar to step S306, step S307, step S308, and step S313 can be added or reduced according to the number of cooling fans. Figure 3 Steps S312 and S313 in the diagram show that one of the cooling fans that are started is randomly turned off. However, the cooling fan corresponding to a certain starting temperature may be turned off accordingly after comparing the temperature of the cooling medium in the radiator with the starting temperature.

[0051] Figure 4 is a graph showing the change of the startup temperature of the heat dissipation fan relative to the ambient temperature according to an exemplary embodiment of the present disclosure.

[0052] Figure 4 The example shown is a case where the converter cooling system includes three cooling fans. The start-up temperature setting for other numbers of cooling fans can refer to Figure 4 A similar setting is performed for the curves shown.

[0053] Reference Figure 4 , the vertical axis represents the starting temperature of the cooling fan, and the horizontal axis represents the ambient temperature. Among them, Ta represents the first ambient temperature threshold, Tb represents the second ambient temperature threshold, and Ta is less than Tb. T0 represents the first starting temperature when the ambient temperature is lower than the first ambient temperature threshold Ta, T1 represents the second starting temperature when the ambient temperature is lower than the first ambient temperature threshold Ta, T2 represents the third starting temperature when the ambient temperature is lower than the first ambient temperature threshold Ta, T3 represents the first starting temperature when the ambient temperature is higher than the second ambient temperature threshold Tb, T4 represents the second starting temperature when the ambient temperature is higher than the second ambient temperature threshold Tb, and T5 represents the third starting temperature when the ambient temperature is higher than the second ambient temperature threshold Tb. As Figure 4 shown, T0 < T1 < T2 < T3 < T4 < T5, and the interval between T0 and T1 (or the interval between T1 and T2) is less than the interval between T3 and T4 (or the interval between T4 and T5). In this case, the slopes of the three curves between the first ambient temperature threshold Ta and the second ambient temperature threshold Tb are different from each other.

[0054] In addition, the maximum starting temperature (for example, Figure 4 T5 in) among the starting temperatures of each cooling fan at the second ambient temperature threshold Tb can be lower than the high-temperature boundary temperature of the cooling medium in the radiator, and the second ambient temperature threshold Tb can be lower than the high-temperature boundary temperature of the ambient temperature. The first ambient temperature threshold Ta can be lower than the minimum starting temperature (for example, Figure 4 T0 in) among the starting temperatures of each cooling fan at the first ambient temperature threshold.

[0055] The following will give examples of calculating the starting temperature of the cooling fan and the ambient temperature threshold:

[0056] First, select the boundary temperature T (high temperature boundary) of the cooling medium of the converter cooling system and the operating environment boundary temperature Te (high temperature boundary) of the external cooling radiator of the converter cooling system.

[0057] a) Since the converter cannot meet full-power operation if the operating environment boundary temperature Te of the external cooling radiator of the converter cooling system is exceeded, the second ambient temperature threshold Tb should be lower than Te, and it can be calculated according to Tb = Te - 2;

[0058] b) When the ambient temperature is higher than the second ambient temperature threshold Tb and all the cooling fans are started, the temperature of the cooling medium in the radiator should not exceed the boundary temperature T. Therefore, the maximum starting temperature threshold T5 of the cooling fan should be lower than the boundary temperature T, and it can be calculated according to T5 = T - 1;

[0059] c) When the ambient temperature exceeds the second ambient temperature threshold Tb, the other starting temperatures are all reduced in steps with a temperature difference of 1°C, that is, T3 and T4 can be set to T4=T-2, T3=T-3;

[0060] d) T2<T3 is required, and T2=T3-2 can be set;

[0061] e) When the ambient temperature is lower than the first ambient temperature threshold value Ta, the other startup temperatures are all reduced in steps of 3°C or 4°C, that is, T1 and T0 can be set to T1=T2-3, T0=T1-3 or T1=T2-4, T0=T1-4;

[0062] f) The first ambient temperature threshold Ta needs to be lower than the minimum startup temperature T0, and can be calculated according to Ta=T0-(T-Te).

[0063] It should be understood that the above calculation steps are only examples, and the numerical values ​​used in the calculation process can be adjusted as needed. For example, the interval between the startup temperatures when the ambient temperature is lower than the first ambient temperature threshold Ta or the interval between the startup temperatures when the ambient temperature is higher than the second ambient temperature threshold Tb can be set to a larger or smaller temperature difference.

[0064] Figure 5 is a block diagram illustrating a converter heat dissipation system according to an exemplary embodiment of the present disclosure.

[0065] like Figure 5 As shown, the converter heat dissipation system according to the exemplary embodiment of the present disclosure may include: a circulation pump 501, whose outlet is connected to the water inlet of the converter 50 via a pipeline; a radiator 502, whose water inlet is connected to the water outlet of the converter 50 via a pipeline, and whose water outlet is connected to the inlet of the circulation pump 501 via a pipeline; a temperature sensor 503, used to measure the temperature of the cooling medium in the radiator 502 and the ambient temperature; a heat dissipation fan 504, used to cool the cooling medium in the radiator 502 by air cooling; a controller 505, configured to: obtain the temperature of the cooling medium in the radiator 502 and the ambient temperature; in response to the temperature of the cooling medium in the radiator 502 being higher than the ambient temperature, determine whether the ambient temperature is between a first ambient temperature threshold and a second ambient temperature threshold, wherein the first ambient temperature threshold is lower than the second ambient temperature threshold; in response to the ambient temperature being between the first ambient temperature threshold and the second ambient temperature threshold, control the starting temperature of the heat dissipation fan 504 to change linearly with the change of the ambient temperature.

[0066] The converter 50 may be a device in a wind turbine generator set for converting three-phase AC power into DC power and converting DC power into three-phase AC power (e.g., a high-power or full-power converter). The radiator 502 may be various radiators (e.g., an external cooling radiator) that can actively or passively exchange heat with the atmosphere. When the circulating pump 501 is in operation, it drives the cooling medium to flow in the pipeline, and allows the cooling medium to first flow into the converter 50 to absorb the heat generated inside the converter 50, and then allows the cooling medium that has absorbed the heat to become a high-temperature cooling medium to flow into the radiator 502, and the heat absorbed by the high-temperature cooling medium is released through the radiator 502 through heat exchange with the atmosphere, so that the cooling medium becomes a low-temperature cooling medium and returns to the circulating pump 501.

[0067] The controller 505 may also be configured to: in response to the temperature of the cooling medium in the radiator 502 being not higher than the ambient temperature, disable the heat dissipation fan 504. In addition, the controller 505 may also be configured to: in response to the ambient temperature being lower than a first ambient temperature threshold and / or the ambient temperature being higher than a second ambient temperature threshold, control the start-up temperature of the heat dissipation fan 504 to be a fixed value.

[0068] in addition, Figure 5 The heat dissipation fan 504 schematically shown in FIG. 5 may include a plurality of heat dissipation fans. In this case, the controller 505 may also be configured to: set a number of startup temperatures corresponding to the number of the plurality of heat dissipation fans, and randomly assign the plurality of startup temperatures to the plurality of heat dissipation fans.

[0069] That is to say, the previous reference Figures 1 to 4 The control method of the converter cooling system according to the exemplary embodiment of the present disclosure, the method for determining the startup scheme of the cooling fan, the method for randomly starting and shutting down the cooling fan, and the calculation process of the startup temperature of the cooling fan can all be applied to Figure 5 The converter cooling system shown in FIG.

[0070] In addition, the converter heat dissipation system as described above can also be included in the converter as a part of the converter, that is, the converter according to the exemplary embodiment of the present disclosure can include the converter heat dissipation system as described above. In addition, the converter according to the exemplary embodiment of the present disclosure can be included in a wind turbine generator set, and the converter can include the converter heat dissipation system as described above.

[0071] By adopting the present disclosure, it is possible to achieve rational control of the cooling fan in the converter cooling system to reduce the operating time of the cooling fan, thereby reducing the self-consumption of power of the wind turbine generator set to increase the power generation of the wind turbine generator set, and at the same time prolong the service life of the cooling fan.

[0072] Although the present disclosure includes specific examples, it will be apparent to those of ordinary skill in the art that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein will be considered to be descriptive only and not for limiting purposes. The description of the features or aspects in each example will be considered to be applicable to similar features or aspects in other examples. Suitable results may be obtained if the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented with other components or their equivalents in the described systems, architectures, devices, or circuits. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents will be interpreted as included in the present disclosure.

Claims

1. A control method for a converter heat dissipation system, characterized in that: The control method comprises: Obtaining the temperature of the cooling medium in the radiator of the converter cooling system and the ambient temperature outside the wind turbine generator set; In response to the temperature of the cooling medium in the radiator being higher than the ambient temperature, determining whether the ambient temperature is between a first ambient temperature threshold and a second ambient temperature threshold, wherein the first ambient temperature threshold is lower than the second ambient temperature threshold; In response to the ambient temperature being between a first ambient temperature threshold and a second ambient temperature threshold, the starting temperature of a heat dissipation fan of a converter heat dissipation system is controlled to change linearly with the change of the ambient temperature, wherein the heat dissipation fan includes a plurality of heat dissipation fans, and the interval between the starting temperatures of the heat dissipation fans at the first ambient temperature threshold is greater than the interval between the starting temperatures of the heat dissipation fans at the second ambient temperature threshold.

2. The control method according to claim 1, characterized in that: The control method further includes: in response to the temperature of the cooling medium in the radiator being not higher than the ambient temperature, disabling the heat dissipation fan.

3. The control method according to claim 1, characterized in that: The control method further includes: in response to the ambient temperature being lower than a first ambient temperature threshold or the ambient temperature being higher than a second ambient temperature threshold, controlling the startup temperature of the heat dissipation fan to be a fixed value.

4. The control method according to claim 3, characterized in that: The startup temperature of the heat dissipation fan at the first ambient temperature threshold is lower than the startup temperature of the heat dissipation fan at the second ambient temperature threshold.

5. The control method according to claim 3, characterized in that: The radiator is an external cooling radiator.

6. The control method according to claim 5, characterized in that: The control method further includes setting a number of startup temperatures corresponding to the number of the plurality of heat dissipation fans, and randomly allocating the plurality of startup temperatures to the plurality of heat dissipation fans.

7. The control method according to claim 1, characterized in that: The maximum startup temperature among the startup temperatures of the heat dissipation fans at the second ambient temperature threshold is lower than the high temperature boundary temperature of the cooling medium in the radiator, and the second ambient temperature threshold is lower than the high temperature boundary temperature of the ambient temperature.

8. The control method according to claim 1, characterized in that: The first ambient temperature threshold is lower than a minimum startup temperature among startup temperatures of each heat dissipation fan at the first ambient temperature threshold.

9. A converter heat dissipation system, characterized in that: The converter heat dissipation system comprises: A circulation pump, the outlet of which is connected to the water inlet of the converter via a pipeline; a radiator, whose water inlet is connected to the water outlet of the converter via a pipeline, and whose water outlet is connected to the inlet of the circulation pump via a pipeline; A temperature sensor, used to measure the temperature of the cooling medium in the radiator and the ambient temperature outside the wind turbine generator set; A heat dissipation fan, used to cool the cooling medium in the radiator by air cooling; A controller, configured to execute the control method according to any one of claims 1 to 8.

10. A converter, characterized in that: The converter comprises the converter heat dissipation system according to claim 9.

11. A wind turbine generator set, characterized in that: The wind turbine generator set comprises the converter according to claim 10.

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