CN213899191U - Cooling system of wind generating set and wind generating set - Google Patents
Cooling system of wind generating set and wind generating set Download PDFInfo
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- CN213899191U CN213899191U CN202023250607.5U CN202023250607U CN213899191U CN 213899191 U CN213899191 U CN 213899191U CN 202023250607 U CN202023250607 U CN 202023250607U CN 213899191 U CN213899191 U CN 213899191U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The utility model provides a wind generating set's cooling system and wind generating set, cooling system includes: the cooling pump comprises a variable frequency pump and a constant speed pump which are arranged in parallel and is used for conveying a cooling medium; two or more cooling branches arranged in parallel with each other and each provided at a corresponding heat generating component of the wind turbine generator set, an outlet of the cooling pump being connected with inlets of the two or more cooling branches and delivering a cooling medium into the two or more cooling branches, respectively, to cool the heat generating components; the cold junction heat transfer device is arranged between the heat generating component and the inlet of the cooling pump and is connected with the two or more cooling branches in series to cool the cooling medium which completes heat exchange, and the control unit controls the flow of the cooling medium which is conveyed to the two or more cooling branches by the cooling pump in real time to balance the flow of the cooling medium required by each cooling branch. The cooling system can accurately control the temperature of each heat generating component while reducing the energy consumption of the system.
Description
Technical Field
The utility model belongs to the technical field of wind power generation, especially, relate to a wind generating set's cooling system and wind generating set.
Background
With the development of large-scale wind generating sets, the heat generated by various components (such as generators, converters, transformers, bearings, etc.) of the wind generating sets is increasingly large, and the air cooling system cannot meet the cooling requirement of the wind generating sets gradually, so that the large-scale wind generating sets mostly adopt a liquid cooling system.
According to the actual demand of the heating components, a mode of combining direct liquid cooling and liquid-air indirect cooling is usually adopted, the power consumption components of the cooling system mainly comprise a water pump motor and a fan motor, the self power consumption of the cooling system is increased along with the increase of the power of the wind generating set, the power consumption is not neglected, and therefore the requirement on energy conservation of the cooling system is gradually highlighted.
On the other hand, one set of liquid cooling system often can simultaneously cool two or more parts in wind generating set heating components such as a generator, a converter, a transformer, a bearing and the like, namely, one pump station corresponds to a plurality of cooling branches connected in parallel, the pressure difference and the flow between the branches are different, in the prior art, a manual valve is mostly adopted to set the flow, or an electric valve is adopted to adjust the flow, and the problem of unbalanced flow exists.
The manual valves are adopted to adjust the flow of each parallel branch, the cooling system needs to be debugged after the unit is produced, the opening of the valves is fixed, the debugging difficulty is high, the liquid supply amount of cooling liquid cannot be changed when the heat productivity of a heating part is changed, and if a water pump start-stop control or constant flow system is adopted, the temperature change range of the heated part is large, the control precision is poor, and the energy consumption of the cooling system is high; although the flow of the cooling medium can be adjusted by adopting the variable flow system with the bypass, the energy consumption of the water pump is not reduced; when the load of a certain branch is changed greatly or a valve is closed without cooling, the flow is changed, the pressure of a pipeline system fluctuates, other parallel branches are greatly influenced, the hydraulic imbalance of the system is caused, the operating condition of each branch deviates from the designed value, and the actual cooling requirement of a cooled device cannot be met.
SUMMERY OF THE UTILITY MODEL
One of the main objects of the present invention is to provide a cooling system of a wind turbine generator system, which can be adjusted in real time according to the load variation of the heat generating components of the wind turbine generator system, so as to accurately control the temperature of each heat generating component while reducing the system energy consumption.
To the above purpose, the present invention provides the following technical solutions:
according to an aspect of the utility model, a cooling system of wind generating set is provided, cooling system includes: the cooling pump comprises a variable frequency pump and a constant speed pump which are arranged in parallel and is used for conveying a cooling medium; two or more cooling branches arranged in parallel with each other and each provided at a respective heat generating component of the wind turbine, an outlet of the cooling pump being connected with inlets of the two or more cooling branches and delivering a cooling medium into the two or more cooling branches, respectively, to cool the heat generating components; the cold end heat exchange device is arranged between the heat generating component and the inlet of the cooling pump and is connected with the two or more cooling branches in series so as to cool the cooling medium subjected to heat exchange; and the control unit controls the flow of the cooling medium conveyed to the two or more cooling branches by the cooling pump in real time so as to balance the flow of the cooling medium required by each cooling branch.
The control unit may be operable to: when the total flow of the required cooling medium is less than or equal to the preset flow, controlling the variable frequency pump to operate; and when the total flow of the required cooling medium is greater than the preset flow, controlling the constant-speed pump and the variable-frequency pump to operate together.
The cooling system may further include a regulating valve provided between an inlet of each of the two or more cooling branches and the heat generating component, wherein the regulating valve regulates a flow rate required for the corresponding cooling branch in real time, and a pressure difference controller for maintaining a pressure difference across the regulating valve constant.
The cooling system may further include a static balancing valve disposed between an inlet of each of the two or more cooling branches and the heat generating component to maintain the cooling system in static hydraulic balance.
The static balancing valve and the pressure difference controller may be respectively disposed on both sides of the regulating valve on each of the two or more cooling branches, wherein the static balancing valve may provide a pressure tapping point for the pressure difference controller.
And each cooling branch of the two or more cooling branches can be provided with a hot end heat exchange device for cooling the heat generating component, each cooling branch can be provided with a first temperature sensor, the first temperature sensor is used for measuring the return air temperature or the return water temperature of the hot end heat exchange device after heat exchange and feeding back the return air temperature or the return water temperature to the control unit, and when the return air temperature or the return water temperature is higher than a first set temperature of the hot end heat exchange device, the control unit controls the frequency conversion pump and the regulating valve on the corresponding cooling branch to be opened for cooling.
After the variable-speed pump and the regulating valves on the corresponding cooling branches are opened for cooling, if the return air temperature or the return water temperature is still higher than the first set temperature of the hot-end heat exchange device, the flow can be increased by regulating the regulating valves on the corresponding cooling branches, and when the total flow of the increased cooling medium is higher than the preset flow, the control unit can control to start the constant-speed pump, so that the constant-speed pump and the variable-speed pump run together.
The cold end heat exchange device comprises at least two cold end heat exchangers which are arranged in parallel, wherein the at least two cold end heat exchangers can be variable frequency fans, or the air volume of the two cold end heat exchangers can be adjusted through a multi-speed motor.
The cooling system can further comprise a second temperature sensor arranged at an inlet or an outlet of the cooling pump, so that the liquid supply temperature of the cooling pump is measured and fed back to the control unit, when the liquid supply temperature is greater than or equal to a second set temperature, the control unit can control the air volume of the at least two cold end heat exchangers to be increased, wherein the first set temperature is greater than the second set temperature.
When the flow of the cooling medium changes, the pressure difference between the liquid supply pressure and the liquid return pressure flowing through the cooling pump also changes, and the frequency of the variable frequency pump can change in real time according to the pressure difference.
The heat generating components may include a generator, a converter, and an in-cabin heat generating component, and the two or more cooling branches may include a generator cooling branch, a converter cooling branch, and a cabin cooling branch that cool the generator, the converter, and the in-cabin heat generating component, respectively, wherein the generator cooling branch is provided with a plurality of generator cooling branches that are connected in parallel with each other, and the regulating valve is provided on each of the plurality of generator cooling branches.
According to another convenience of the present invention, there is provided a wind turbine generator system comprising a cooling system as described above.
According to the embodiment of the utility model, provide kinetic energy for the coolant circulation through adopting the parallelly connected mode of inverter pump and constant speed pump, the cost of cooling pump is compared with whole inverter pump that use and has certain advantage, simultaneously make full use of inverter pump's variable flow function for cooling system can adjust coolant's flow distribution, the energy consumption of at utmost reduction cooling pump according to the demand maximum range ground of each part that generates heat.
In addition, the cold end heat abstractor adopts frequency conversion fan or other speed governing fans to make the cooling amount of wind of cold end radiator can adjust the heat dissipation at the maximum scope according to the heat dissipation demand of two or more cooling branches, reduces the cooling fan energy consumption.
In addition, the flow of each parallel cooling branch is controlled and adjusted by adopting the adjusting valve and the differential pressure controller, the temperature of the liquid supply of each cooling branch can be accurately controlled according to the load change of each cooling branch of the wind generating set, so that the reliability of heating components such as a generator, a converter, a cabin and the like is improved, and the service life is prolonged.
According to the utility model discloses an embodiment, through the flow control valve member integration with each cooling branch road on the pump package, constitute an integrated unit that collects cooling pump, control valve, balanced valve as an organic whole, make cooling system pipeline layout simplify, and the maintenance of being convenient for overhauls.
In addition, according to the utility model discloses a cooling system fundamentally has overcome the water conservancy imbalance phenomenon, does not need the same form system of special design, practices thrift pipeline layout space, reduces the pipeline investment. The flow of the cooling medium required by each cooling branch can be independently adjusted and is not interfered with each other, and when the flow and the pressure of a certain branch are changed, the rest branches are not influenced, so that the debugging process is greatly simplified.
Drawings
The above and/or other objects and advantages of the present invention will become more apparent from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic block diagram of a cooling system for a wind turbine generator set according to the present invention.
Description of reference numerals:
1-variable frequency pump, 2-constant speed pump, 3-check valve, 4-pressure gauge, 5-pressure sensor, 6-constant pressure device, 7-filter, 8-liquid discharge valve, 9-shutoff valve, 10-second temperature sensor, 11-static balance valve, 12-regulating valve, 13-pressure difference controller, 14-generator hot end heat exchanger, 16-converter hot end heat exchanger, 17-cabin hot end heat exchanger, 15-exhaust valve, 18-cold end heat exchanger, and 19-second temperature sensor.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, it should not be understood that the embodiments of the present invention are limited to the embodiments set forth herein. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
In one aspect of the present invention, a wind turbine generator system is provided, which includes a tower (not shown), a nacelle (not shown), a generator (not shown), a wind wheel (not shown), and the like. The main heating components of the wind generating set are a generator, a converter, a transformer, a bearing and the like.
For these heat generating components, the wind power plant is provided with a cooling system, which is described in detail below with respect to the cooling system according to the invention.
As shown in fig. 1, a cooling system for a wind turbine generator system according to an embodiment of the present invention includes: the cooling pump comprises a variable frequency pump 1 and a constant speed pump 2 which are arranged in parallel and used for conveying a cooling medium; two or more cooling branches arranged in parallel with each other and each arranged at a respective heat generating component of the wind park, an outlet of the cooling pump being connected with inlets of the two or more cooling branches and delivering cooling medium into the two or more cooling branches, respectively, for cooling the heat generating components in the respective cooling branches; and the cold end heat exchange device is arranged between the heat generating component and the inlet of the cooling pump and is connected with the two or more cooling branches in series so as to cool the cooling medium which completes heat exchange. In addition, the cooling system further comprises a control unit, and the control unit can control the flow rate of the cooling medium delivered to the two or more cooling branches by the cooling pump in real time so as to balance the flow rate of the cooling medium required by each cooling branch.
Specifically, the cold end heat exchange device may be one or more cold end heat exchangers directly connected in series to the cooling branch of the total outlet of the two or more cooling branches connected in parallel, or may be two or more cold end heat exchangers respectively disposed on each of the two or more cooling branches, and the number and the arrangement manner thereof are not limited. According to the utility model discloses an embodiment, preferably, as shown in FIG. 1, directly establish ties cold junction heat transfer device on the cooling branch road of the total export of two or more cooling branch roads that connect in parallel to make cold junction heat transfer device cool off the coolant in two or more cooling branch roads simultaneously, avoid the waste of energy. However, the utility model discloses be not limited to this, also can correspond on parallelly connected every cooling branch and set up a cold junction heat transfer device to cooling control is carried out according to the cooling demand of every cooling branch. Further, the control unit controls the cooling pump as follows: when the total flow of the cooling media required by the two or more cooling branches is less than or equal to the preset flow, the control unit controls the variable-frequency pump 1 to operate only, and when the total flow of the cooling media required by the two or more cooling branches is greater than the preset flow, the control unit controls the constant-speed pump 2 to operate together with the variable-frequency pump 1. That is, during the initial operation stage of the cooling system, the inverter pump is preferentially started, wherein the predetermined flow rate may be the maximum flow rate that the inverter pump can provide.
The cooling system may include a static balancing valve 11 disposed between the inlet of each cooling branch and the heat generating components to maintain the cooling system in static hydraulic balance. Specifically, in the initial state of the cooling system, the opening degree of the static balance valve 11 is adjusted to enable the flow rate passing through each cooling branch to reach the design value, the static hydraulic imbalance phenomenon caused by the deviation of the resistance of each cooling branch from the design value is eliminated, and the opening degree of the static balance valve 11 is fixed to enable the cooling system to reach the static balance.
Further, on each cooling branch (specifically, between the inlet of each cooling branch and the heat generating component), a regulating valve 12 and a differential pressure controller 13 may be provided. The regulating valve 12 can regulate the flow rate required by the corresponding cooling branch in real time, and the pressure difference controller 13 is used for keeping the pressure difference between two ends of the regulating valve 12 constant. Specifically, the regulating valve 12 can regulate the opening degree thereof and thus the flow rate in the corresponding cooling branch according to a control signal of the control unit (the control signal may be a signal fed back to the control unit as a result of sensing by the first temperature sensor 19, which will be described in detail later). The differential pressure controller 13 can adjust its opening degree according to the differential pressure across the regulating valve 12, thereby keeping the differential pressure across the regulating valve 12 constant.
Wherein the static balance valve 11 and the pressure difference controller 13 can be respectively arranged on two sides of the regulating valve 12, so that the static balance valve 11 can provide a pressure taking point for the pressure difference controller 13 to enable the pressure difference controller 13 to obtain the pressure on two sides of the regulating valve 12. However, when the pressure difference controller 13 is used to realize the pressure difference regulation across the regulating valve 12, an additional pressure measuring interface (not shown) may also be used instead of the static balancing valve 11, and when a pressure measuring interface is used, the pressure measuring interface and the pressure difference controller 13 are also respectively provided on both sides of the regulating valve 12. The pressure difference controller 13 keeps the pressure difference between the two ends of the regulating valve 12 constant, and when the pressure and the flow of other parallel cooling loops are changed, the flow of the branch heat exchanger where the flow of the branch heat exchanger is located is kept constant and is not influenced.
On each cooling branch, a hot-end heat exchanger (such as a hot-end heat exchanger) for cooling the corresponding heat generating component is arranged, and a first temperature sensor 19 is arranged, wherein the first temperature sensor 19 is used for measuring the return air temperature or the return water temperature of the hot-end heat exchanger after heat exchange with the heat generating component and feeding back the return air temperature or the return water temperature to the control unit. After the wind generating set starts to operate, the heat load of the heating part is gradually increased, and when the return air temperature or the return water temperature is higher than the first set temperature T of the hot-end heat exchange device01And when the frequency conversion pump 1 is started, the control unit controls the regulating valve 12 on the corresponding cooling branch to be opened for cooling. Where air cooling is employed, the first temperature sensor 19 senses the temperature of the air (i.e., the return air temperature) while the hot side heat exchanger cools the air. When water cooling is employed, the hot-side heat exchanger directly cools a cooling medium (such as, but not limited to, water) flowing through the heat-generating component, and the first temperature sensor 19 detects the temperature of the cooling medium in the hot-side heat exchanger (i.e., the return water temperature). When different cooling modes are adopted, different first set temperatures T can be set01。
After the variable frequency pump 1 and the regulating valve 12 on the corresponding cooling branch are opened for cooling, if the return air temperature or the return water temperature is still greater than the first set temperature T of the hot-end heat exchange device01The flow is increased by adjusting the regulating valve 12 on the respective cooling branch. When the increased total flow of the cooling medium is larger than the preset flow (namely when only the variable frequency pump 1 cannot meet the flow demand), the control unit controls and starts the constant speed pump 2 to enable the constant speed pump 2 and the variable frequency pump 1 to operate together; when the total flow rate of the increased cooling medium is still less than or equal toWhen the flow is fixed (namely, only the variable frequency pump 1 is used to meet the flow requirement), the control unit controls the variable frequency motor to increase the flow of the cooling medium output by the variable frequency pump 1 so as to meet the flow requirement of each cooling branch.
In the cooling system according to the utility model discloses a wind generating set's of embodiment, the part that generates heat can include the generator, converter and the cabin in the part that generates heat etc. correspondingly, two or more cooling branches can include the generator cooling branch road, the converter cooling branch road and the cabin cooling branch road of cooling the generator, converter and the cabin in the part that generates heat respectively. Similarly, the hot end heat exchanger device can comprise a generator hot end heat exchanger 14, a converter hot end heat exchanger 16 and a cabin hot end heat exchanger 17, wherein a low-temperature cooling medium enters the hot end heat exchanger, absorbs the heat of a heating component and then becomes a high-temperature cooling medium which flows out of the hot end heat exchanger.
Because the number of heating structures in the generator is large, a plurality of generator cooling branches which are connected in parallel are arranged on the generator cooling branches, and each branch is provided with a generator hot-end heat exchanger 14. Furthermore, a regulating valve 12 is provided on each of the plurality of generator cooling branches. In this way, the static balance valve 11 and the pressure difference controller 13 on the generator cooling branch may be disposed on the inlet side and the outlet side of the generator cooling branch, respectively.
Furthermore, according to the utility model discloses a wind generating set's cooling system is still including setting up the check valve 3 at the outlet side of inverter pump 1 and constant speed pump 2 respectively to prevent the coolant refluence that inverter pump 1 and constant speed pump 2 carried.
A pressure gauge 4 is provided at the outlet of the cooling pump to visually display the pressure at the outlet of the cooling pump. Furthermore, a pressure sensor 5 can be provided at the outlet of the cooling pump, which pressure sensor 5 monitors the pressure signal of the cooling medium at the location of its line and transmits the pressure signal to the control unit. The inlet side or the outlet side of the cooling pump can be provided with a constant pressure device 6, and the constant pressure device 6 provides a constant pressure point for the cooling system so as to keep the pressure of the cooling system constant, prevent the pressure from greatly fluctuating and ensure the normal work of the system.
Further, on the inlet side of the cooling pump, a filter 7, a drain valve 8 and a shut-off valve 9 may be provided. Wherein the filter 7 can filter out foreign particles in the cooling system, preventing damage to the cooling pump and clogging of the heat exchanger. The drain valve 8 is used for discharging the cooling medium in the system pipeline and the equipment. The shut-off valve 9 can shut off the flow of cooling medium in the line and close it when the system requires maintenance. In addition, a shut-off valve 9 can be arranged on both sides of the variable-frequency pump 1 and the constant-speed pump 2.
On each cooling branch, an exhaust valve 15 may be provided, the exhaust valve 15 being used to exhaust air in the cooling system, preventing air in the cooling system from damaging the cooling pump or reducing heat exchange performance of the heat exchanger.
According to the utility model discloses an embodiment, as shown in FIG. 1 for carry out refrigerated cold junction heat transfer device to the coolant medium who has carried out the heat exchange can be including two at least cold junction heat exchangers 18 of parallelly connected setting each other, and cold junction heat exchanger 18 can carry out the heat exchange with external atmosphere, makes the high temperature liquid temperature who flows out from hot junction heat exchanger 14, 16 and 17 reduce, and then cyclic utilization. The cold end heat exchanger 18 may be a variable frequency fan capable of adjusting frequency, or the air volume of the cold end heat exchanger 18 may be adjusted by a multi-speed motor.
Furthermore, the cooling system may further comprise a second temperature sensor 10 arranged at the inlet or outlet of the cooling pump. The second temperature sensor 10 may measure the temperature of the liquid supply of the cooling pump and feed back to the control unit. The cold side heat exchanger 18 may adjust the frequency of the fan motor via a frequency converter or may control the amount of air by varying the speed of the multi-speed motor based on the temperature of the feed liquid measured by the second temperature sensor 10. Specifically, the second set temperature T may be set as needed02When the liquid supply temperature is greater than or equal to a second set temperature T02In the meantime, the control unit controls and increases the air volume of the cold-end heat exchanger 18 to reduce the liquid supply temperature, thereby ensuring the cooling effect of the cooling system.
According to the utility model discloses an embodiment, first settlement temperature T01Greater than a second set temperature T02To ensure that the cooling medium can cool the heat generating component, the second set temperature is set in a manner similar to the first set temperatureAnd is not limited herein.
In addition, when the flow rate of the cooling medium changes as described above, the pressure difference between the supply pressure and the return pressure flowing through the cooling pump changes, and the frequency of the variable frequency pump 1 can be changed in real time according to the supply pressure difference, wherein the supply pressure refers to the pressure at the outlet of the cooling pump, and the return pressure refers to the pressure at the inlet of the cooling pump.
In addition, as shown in the drawings, according to the embodiment of the present invention, the variable frequency pump 1, the constant speed pump 2, the frequency modulator, the check valve 3, the pressure gauge 4, the pressure sensor 5, the constant pressure device 6, the filter 7, the liquid discharge valve 8, the shut-off valve 9, the second temperature sensor 10, the static balance valve 11, the regulating valve 12, the differential pressure controller 13 on the converter cooling branch and the engine compartment cooling branch, and the differential pressure controller 13 on the generator cooling branch can be integrated on the pump set, so that the pipeline layout of the cooling system is simplified, and the maintenance and the overhaul are facilitated. However, the components integrated on the pump group are not limited to the above-mentioned components, and one or more of the above-mentioned components may be separately provided or more components may be integrated on the pump group according to actual needs.
The operation of the entire system will be described in detail below.
In the initial state of the cooling system, the opening degree of the static balance valve 11 is adjusted to make the flow rate passing through each cooling branch reach the design value, and the opening degree of the static balance valve 11 is fixed to make the cooling system reach the static balance.
After the wind generating set starts to operate, the heat loads of the generator, the converter and the engine room are gradually increased, the return water temperature or the return water temperature sensed by the first temperature sensor 19 is gradually increased, and when the control unit receives that the return water temperature or the return water temperature fed back by the first temperature sensor 19 on a certain cooling branch is higher than a first set temperature T01When the cooling system runs, the variable frequency pump 1 and the regulating valve 12 on the cooling branch are controlled to be opened, the cooling medium circularly flows in the pipeline, and the cooling system starts to run.
Meanwhile, the hot end heat exchange device and the cold end heat exchange device start to operate, and the cooling medium passes through the hot end heat exchanger on the cooling branch to take away heat generated by the heating component. Meanwhile, the cooling medium is changed into high-temperature liquid and then flows through the cold-end heat exchange device (the cold-end heat exchanger 18) to radiate heat to the outside, the cooling medium is changed into low-temperature liquid again and flows back to the cooling pump to continue circulation, so that the heat of the heating component is continuously taken away, and the normal operation of the system is ensured.
In the process, the control unit continuously monitors the return air temperature or the return water temperature, and if the return air temperature or the return water temperature is still greater than the first set temperature T01The opening of the regulating valve 12 continues to increase, increasing the flow through the hot side heat exchanger. When the variable frequency pump 1 can not meet the flow demand, the constant speed pump 2 is started, and meanwhile, the rotating speed of the variable frequency pump is reduced. If the required flow rate continues to increase, the rotation speed of the variable frequency pump 1 continues to increase again until the flow rate provided by the cooling system is kept at the required total flow rate.
In addition, as the heat productivity of the heating component is increased, the air volume of the cold-end heat exchanger is gradually increased along with the rising of the outlet water temperature of the cold-end heat exchanger, so that the temperature of the cooling medium is reduced.
When the flow of the cooling system changes, the pressure difference between the liquid supply pressure and the liquid return pressure before and after the cooling pump also changes, and the control unit can adjust the frequency of the variable frequency pump according to the pressure difference. When the flow demand of the cooling system is reduced, the control unit can reduce the rotating speed of the variable frequency pump 1 by adjusting the frequency of the frequency converter to reduce the frequency, and adjust the flow supply, so that the requirement that the heat dissipation of a demand end is reduced is met, and meanwhile, the running energy consumption of the water pump is reduced due to the reduction of the flow.
Furthermore, the pressure of the cooling system is affected when the flow rate of each cooling branch is adjusted. The wind generating set has a plurality of heating components, namely a plurality of cooling branches. In general, the mutual interference of the adjustment of the flow rate makes it difficult to balance the system, and the cooling branches cannot achieve the required flow rate through the adjustment. And according to the utility model discloses an embodiment, the pressure drop that sets up the pressure differential controller 13 on each cooling branch road can utilize its self case changes and compensate the change of pipeline resistance to can keep its two pressure differences of getting between the pressure port (being located static balance valve 11 and pressure differential controller 13 respectively) unchangeable when the operating mode changes, namely, keep the pressure difference at governing valve 12 both ends unchangeable, like this, the flow through governing valve 12 only receives return air temperature or return water temperature's influence, and does not receive the influence of the cooling system pressure fluctuation that other cooling branch road's flow control arouses. In this way, the actual flow characteristics of the regulating valve 12 can be kept consistent with the ideal flow characteristics, and the regulating capacity of the regulating valve is greatly improved, so that the regulating valve can be regulated according to the change of the actual heat load of the parallel cooling branches to achieve the corresponding required flow.
In addition, during the period, the cold end heat exchange device adjusts the air volume in real time according to the temperature detected by the second temperature sensor, when the detected liquid supply temperature is greater than or equal to a second set temperature, the control unit controls to increase the air volume of the cold end heat exchanger, and when the detected liquid supply temperature is less than the second set temperature, the control unit controls to decrease the air volume of the cold end heat exchanger or keeps the air volume unchanged.
Further, although the cooling system according to the embodiment of the present invention is shown to include three cooling branches, it is not limited thereto, and the number of cooling branches may be increased or decreased according to actual needs, for example, a transformer cooling branch and a bearing cooling branch may be increased according to needs, and the like.
As described above, the differential pressure controller 13 and the regulator valve 12 are provided separately, however, they may be replaced by a valve body in which two functions are integrated, for example, the integrated valve body may be composed of a hydraulic automatic adjusting portion and an electric adjustable portion, but not limited thereto.
According to the utility model discloses an embodiment provides kinetic energy for the coolant circulation through adopting inverter pump and the parallelly connected mode of constant speed pump, and the cost of cooling pump is compared with whole inverter pump that use and has certain advantage, simultaneously make full use of inverter pump's variable flow function for but cooling system maximum limit ground adjusts coolant's flow, the energy consumption of at utmost reduction cooling pump.
In addition, the cooling air quantity of the cold-end radiator can be adjusted within the maximum range by adopting a variable frequency fan or other speed regulation fans, and the energy consumption of the cooling fan is reduced.
In addition, the flow of each parallel cooling branch is controlled and adjusted by adopting the adjusting valve and the differential pressure controller, the temperature of the liquid supply of each cooling branch can be accurately controlled according to the load change of each cooling branch of the wind generating set, so that the reliability of heating components such as a generator, a converter, a cabin and the like is improved, and the service life is prolonged.
According to the utility model discloses an embodiment, through the flow control valve member integration with each cooling branch road on the pump package, constitute an integrated unit that collects cooling pump, control valve, balanced valve as an organic whole, make cooling system pipeline layout simplify, and the maintenance of being convenient for overhauls.
In addition, according to the utility model discloses a cooling system fundamentally has overcome the water conservancy imbalance phenomenon, does not need the same form system of special design, practices thrift pipeline layout space, reduces the pipeline investment. Each cooling branch can be independently adjusted and not interfered with each other, so that the debugging process is greatly simplified.
In the above description, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The described features, structures, or characteristics of the invention may be combined in any suitable manner in one or more embodiments. In the description above, numerous specific details are provided to give a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
Claims (12)
1. A cooling system of a wind turbine generator set, characterized in that the cooling system comprises:
the cooling pump comprises a variable frequency pump (1) and a constant speed pump (2) which are arranged in parallel and used for conveying a cooling medium;
two or more cooling branches arranged in parallel with each other and each provided at a respective heat generating component of the wind turbine, an outlet of the cooling pump being connected with inlets of the two or more cooling branches and delivering a cooling medium into the two or more cooling branches, respectively, to cool the heat generating components;
the cold end heat exchange device is arranged between the heat generating component and the inlet of the cooling pump and is connected with the two or more cooling branches in series so as to cool the cooling medium subjected to heat exchange; and
and the control unit controls the flow of the cooling medium conveyed to the two or more cooling branches by the cooling pump in real time so as to balance the flow of the cooling medium required by each cooling branch.
2. The cooling system of claim 1, wherein the control unit is configured to: when the total flow of the required cooling medium is less than or equal to the preset flow, controlling the variable frequency pump (1) to operate; and when the total flow of the required cooling medium is larger than the preset flow, controlling the constant-speed pump (2) and the variable-frequency pump (1) to operate together.
3. The cooling system according to claim 2, further comprising a regulating valve (12) and a pressure difference controller (13) provided between an inlet of each of the two or more cooling branches and the heat generating component,
the regulating valve (12) regulates the flow required by the corresponding cooling branch in real time, and the pressure difference controller (13) is used for keeping the pressure difference between two ends of the regulating valve (12) constant.
4. The cooling system of claim 3, further comprising a static balancing valve (11) disposed between the inlet of each of the two or more cooling branches and the heat generating component to maintain a static hydraulic balance of the cooling system.
5. Cooling system according to claim 4, characterized in that on each of the two or more cooling branches a static balancing valve (11) and a pressure differential controller (13) are arranged on both sides of the regulating valve (12), respectively, wherein the static balancing valve (11) provides a pressure tapping point for the pressure differential controller (13).
6. The cooling system according to claim 3, wherein each of the two or more cooling branches is provided with a hot-side heat exchanger for cooling the heat-generating component, and each cooling branch is provided with a first temperature sensor (19), and the first temperature sensor (19) is used for measuring return air temperature or return water temperature of the hot-side heat exchanger after heat exchange and feeding back the return air temperature or return water temperature to the control unit,
when the return air temperature or the return water temperature is higher than a first set temperature of the hot-end heat exchange device, the control unit controls to open the variable frequency pump (1) and the regulating valve (12) on the corresponding cooling branch for cooling.
7. The cooling system according to claim 6, characterized in that after the variable frequency pump (1) and the regulating valves (12) on the corresponding cooling branches are opened for cooling, if the return air temperature or the return water temperature is still greater than the first set temperature of the hot-end heat exchange device, the flow is increased by regulating the regulating valves (12) on the corresponding cooling branches, and when the total flow of the increased cooling medium is greater than the predetermined flow, the control unit controls to start the constant speed pump (2) so that the constant speed pump (2) and the variable frequency pump (1) operate together.
8. Cooling system according to claim 6, characterized in that the cold end heat exchange means comprise at least two cold end heat exchangers (18) arranged in parallel with each other,
the at least two cold end heat exchangers (18) are variable frequency fans, or the air volume of the two cold end heat exchangers (18) is adjusted through a multi-speed motor.
9. A cooling system according to claim 8, characterised in that the cooling system further comprises a second temperature sensor (10) arranged at the inlet or outlet of the cooling pump to measure the liquid supply temperature of the cooling pump and feed back to the control unit,
when the liquid supply temperature is greater than or equal to a second set temperature, the control unit controls the air volume of the at least two cold end heat exchangers (18) to be increased,
wherein the first set temperature is greater than the second set temperature.
10. The cooling system according to any one of claims 1-9, characterized in that when the flow of the cooling medium changes, the pressure difference between the supply pressure and the return pressure of the cooling pump changes, and the frequency of the variable frequency pump (1) changes in real time in accordance with the pressure difference.
11. The cooling system according to any one of claims 3 to 9,
the heat generating components comprise a generator, a converter and heat generating components in the engine room,
the two or more cooling branches comprise a generator cooling branch, a converter cooling branch and a cabin cooling branch which respectively cool the generator, the converter and the heating components in the cabin,
wherein a plurality of generator cooling branches connected in parallel with each other are provided on the generator cooling branch, and the regulating valve (12) is provided on each of the plurality of generator cooling branches.
12. A wind park according to any of claims 1-11, wherein the wind park comprises a cooling system according to any of claims 1-11.
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| CN202023250607.5U CN213899191U (en) | 2020-12-29 | 2020-12-29 | Cooling system of wind generating set and wind generating set |
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| CN202023250607.5U CN213899191U (en) | 2020-12-29 | 2020-12-29 | Cooling system of wind generating set and wind generating set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216057A (en) * | 2021-12-29 | 2022-03-22 | 中海油能源发展股份有限公司采油服务分公司 | Automatic and accurate control chemical dosing system and method for ship |
| CN116581428A (en) * | 2023-07-12 | 2023-08-11 | 宁德时代新能源科技股份有限公司 | Cooling system and energy storage power station |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216057A (en) * | 2021-12-29 | 2022-03-22 | 中海油能源发展股份有限公司采油服务分公司 | Automatic and accurate control chemical dosing system and method for ship |
| CN116581428A (en) * | 2023-07-12 | 2023-08-11 | 宁德时代新能源科技股份有限公司 | Cooling system and energy storage power station |
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Address after: 830026 No. 107, Shanghai Road, Urumqi economic and Technological Development Zone, the Xinjiang Uygur Autonomous Region Patentee after: Jinfeng Technology Co.,Ltd. Address before: 830026 No. 107, Shanghai Road, Urumqi economic and Technological Development Zone, the Xinjiang Uygur Autonomous Region Patentee before: XINJIANG GOLDWIND SCIENCE & TECHNOLOGY Co.,Ltd. |