Heating system of gearbox and wind generating set

Abstract

The utility model provides a heating system of a gearbox and a wind generating set. The lubricating oil heating system comprises a three-way valve, a pumping device, a first heat exchange device and a second heat exchange device, an outlet of the pumping device is connected to the first end of the first heat exchange device used for absorbing heat, an inlet of the pumping device is connected to the first end of the second heat exchange device used for transferring heat to a gearbox, and an outlet of the pumping device is connected to the second end of the second heat exchange device used for transferring heat to the gearbox. A first port of the three-way valve is connected to the second end of the first heat exchange device, a second port of the three-way valve is connected to the inlet of the pumping device, and a third port of the three-way valve is connected to the second end of the second heat exchange device. The heating system of the gearbox has the advantages that heating of lubricating oil of the gearbox is achieved under the condition that cost is not increased, and heating power of the gearbox is greatly improved.

Description

Technical Field

[0001] The utility model generally relates to the field of gear boxes and wind power generation, and more specifically, to a heating system of a gear box and a wind power generator set. Background Art

[0002] Gearboxes are widely used in related fields to transmit power to generators. Under certain operating conditions, such as low temperatures, the viscosity of the lubricating oil used to lubricate the gearbox increases as the temperature decreases, causing its fluidity to deteriorate and making it difficult to form an effective oil film. This can significantly impact the life of the gearbox.

[0003] The existing heating scheme for gearbox lubricating oil is to heat the lubricating oil by setting a heater in the oil pool of the gearbox (such as Figure 5 However, the existing solutions mentioned above can lead to long heating times and certain heater costs. Furthermore, as gearboxes are increasingly used in the wind power sector, the aforementioned issues become increasingly important and urgently need to be addressed when gearboxes are used as components of wind turbines (hereinafter referred to as "wind turbines"). Utility Model Content

[0004] An exemplary embodiment of the present invention provides a heating system for a gearbox, so as to achieve the purpose of heating the lubricating oil of the gearbox by utilizing the waste heat of a heat exchange device that has no association with the gearbox.

[0005] According to one aspect of the present utility model, a heating system for a gear box is provided, which is used to heat the lubricating oil in the gear box, and the heating system includes a three-way valve, a pumping device, a first heat exchange device and a second heat exchange device, wherein the outlet of the pumping device is connected to the first end of the first heat exchange device for absorbing heat, the inlet of the pumping device is connected to the first end of the second heat exchange device for transferring heat to the gear box, the first port of the three-way valve is connected to the second end of the first heat exchange device, the second port of the three-way valve is connected to the inlet of the pumping device, and the third port of the three-way valve is connected to the second end of the second heat exchange device.

[0006] According to one aspect of the present invention, the three-way valve, the pumping device and the first heat exchange device and the pipeline used to connect the three can constitute a first circuit, wherein the coolant in the first circuit is heated by the heat absorbed by the first heat exchange device when the three-way valve is in the first state and the pumping device is in the open state, so as to realize heat transfer from the first heat exchange device to the coolant in the first circuit, and the first state indicates that both the first port and the second port are open and the third port is closed.

[0007] According to one aspect of the present invention, the three-way valve, the pumping device, the first heat exchange device and the second heat exchange device and the pipeline used to connect the four can constitute a second circuit, wherein the coolant in the second circuit that has absorbed heat transfers heat to the gear box when the three-way valve is in the second state to achieve heating of the lubricating oil of the gear box, and the second state indicates that both the first port and the third port are open and the second port is closed.

[0008] According to one aspect of the present invention, the first heat exchange device may include a first group of heat exchange devices and a second group of heat exchange devices, wherein one end of the first group of heat exchange devices is the first end of the first heat exchange device, the other end of the first group of heat exchange devices is connected to one end of the second group of heat exchange devices, and the other end of the second group of heat exchange devices is the second end of the first heat exchange device.

[0009] According to one aspect of the present invention, the first heat exchange device may include a first group of heat exchange devices and a second group of heat exchange devices, wherein one end of the first group of heat exchange devices and one end of the second group of heat exchange devices are connected to each other to correspond to the first end of the first heat exchange device, and the other end of the first group of heat exchange devices and the other end of the second group of heat exchange devices are connected to each other to correspond to the second end of the first heat exchange device.

[0010] According to an aspect of the present invention, the heating system may further include a first temperature sensor, which may be installed in the first circuit and configured to detect a temperature of the coolant in the first circuit.

[0011] According to one aspect of the present invention, the heating system may further include a second temperature sensor. The second temperature sensor may be disposed in a flow path of the lubricating oil of the gear box to detect the temperature of the lubricating oil of the gear box.

[0012] According to one aspect of the present invention, the first heat exchange device is connected to a grid-side module, and the grid-side module is used to provide heat to the first heat exchange device.

[0013] According to one aspect of the present invention, a wind turbine generator set is provided, comprising: a transformer, one end of the transformer being connected to a power grid, the other end of the transformer being connected to a converter, the converter comprising at least one grid-side module, and a heating system for the gearbox as described above, the grid-side module providing heat to the heating system to heat the lubricating oil of the gearbox.

[0014] According to the heating system of the gearbox of the present invention, the heat of the coolant heated by cooling the heat exchange device not associated with the gearbox is transferred to the heat exchange device associated with the gearbox, thereby heating the gearbox lubricating oil, thereby achieving the beneficial effect of greatly improving the heating power of the gearbox without increasing the cost.

[0015] Additional aspects and / or advantages of the present general inventive concept will be set forth in part in the following description, and some will be clear from the description or may be learned through practice of the present general inventive concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects and features of the exemplary embodiments of the present invention will become more apparent through the following description in conjunction with the accompanying drawings which exemplarily illustrate the embodiments, in which:

[0017] Figure 1 1 is a block diagram showing a heating system for a gearbox according to an embodiment of the present invention;

[0018] Figure 2 is a diagram showing an example structure of a first heat exchange device according to an embodiment of the present utility model;

[0019] Figure 3 is another exemplary structural diagram showing a first heat exchange device according to an embodiment of the present utility model;

[0020] Figure 4 is a block diagram showing an example structure of a heating system for a gearbox according to an embodiment of the present invention;

[0021] Figure 5 is a block diagram showing the structure of a conventional gearbox;

[0022] Figure 6 is an exemplary circuit diagram showing a grid-side module corresponding to a first heat exchange device according to an embodiment of the present utility model;

[0023] Figure 7 is a structural block diagram showing a specific example of a heating system for a gear box according to an embodiment of the present utility model;

[0024] Figure 8 It is the use of Figure 7A schematic flow chart of a specific example of implementing a heating process. DETAILED DESCRIPTION

[0025] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be clear after understanding the disclosure of the present invention. For example, the order of operations described herein is merely an example and is not limited to those orders set forth herein, but may be changed as will be clear after understanding the disclosure of the present invention, except for operations that must occur in a specific order. In addition, for greater clarity and conciseness, descriptions of features known in the art may be omitted.

[0026] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided to illustrate only some of the many possible ways to implement the methods, devices, and / or systems described herein, which will become clear after understanding the disclosure of the present invention.

[0027] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more.

[0028] The terms used herein are only used to describe various examples and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" indicate the presence of the recited features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0029] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as that generally understood by a person of ordinary skill in the art to which the present invention pertains after understanding the present invention. Unless expressly defined otherwise herein, terms (such as those defined in general dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present invention, and should not be interpreted in an idealized or overly formal manner.

[0030] Furthermore, in the description of examples, when it is deemed that a detailed description of well-known related structures or functions will cause an obscure interpretation of the present invention, such detailed description will be omitted.

[0031] Reference will now be made in detail to embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments will be described below with reference to the accompanying drawings to explain the present invention.

[0032] According to an embodiment of the present utility model, a heating system for a gearbox is provided. By cooling a heat exchange device not associated with the gearbox, the heat of the heated coolant is transferred to the heat exchange device associated with the gearbox, thereby heating the lubricating oil of the gearbox, thereby achieving the beneficial effect of greatly improving the heating power of the gearbox without increasing the cost.

[0033] In addition, in the application scenario of wind power, wind turbines (hereinafter referred to as "units") will cause a series of problems such as increased viscosity of the gearbox lubricating oil in low temperature environments. Since the volume of the oil pool is fixed and limited, when using Figure 5 When the heater shown heats the lubricating oil sump, assuming that the power of a single heater does not exceed, for example, 500W and the total heating power of all heaters does not exceed 2kW, in an example where the gearbox oil filling volume is over 1000L and conventional heater solutions are used to heat the gearbox lubricating oil from -35°C to -15°C, it may take five hours without considering heat dissipation from the gearbox housing, and up to eight hours with this consideration. This can have a significant negative impact on units operating in low-temperature environments, for example, potentially significantly reducing the unit's power generation in low-temperature conditions. Therefore, the gearbox heating system proposed in this utility model, when applied to a unit, can effectively address these issues.

[0034] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0035] Figure 1 1 is a block diagram showing a heating system for a gearbox according to an embodiment of the present invention. Figure 2 : is a diagram showing an example structure of a first heat exchange device according to an embodiment of the present utility model, Figure 3 is another exemplary structural diagram showing a first heat exchange device according to an embodiment of the present utility model, and Figure 4 FIG. 1 is a block diagram showing an example structure of a heating system for a gearbox according to an embodiment of the present invention.

[0036] Reference Figure 1 and Figure 4 According to an embodiment of the present invention, a heating system 100 for a gearbox (hereinafter, also referred to as “heating system 100 ”) includes: a three-way valve 10 , a pumping device 20 , a first heat exchange device 30 and a second heat exchange device 50 .

[0037] According to an embodiment of the present invention, the outlet 21 of the pumping device 20 is connected to the first end 31 of the first heat exchange device 30 for absorbing heat, and the inlet 22 of the pumping device 20 is connected to the first end 51 of the second heat exchange device 50 for transferring heat to the gearbox 40.

[0038] According to an embodiment of the present invention, the first port 11 of the three-way valve 10 is connected to the second end 32 of the first heat exchange device 30, the second port 12 of the three-way valve 10 is connected to the inlet 22 of the pumping device 20, and the third port 13 of the three-way valve 10 is connected to the second end 52 of the second heat exchange device 50.

[0039] According to the heating system 100 of the present invention, by cooling the first heat exchange device not associated with the gearbox, the heat of the heated coolant is transferred to the second heat exchange device associated with the gearbox, thereby heating the gearbox lubricating oil, thereby greatly improving the heating power of the gearbox without increasing the cost.

[0040] As an example, in Figure 1 and Figure 4 The three-way valve 10, the pumping device 20 and the first heat exchange device 30 and the pipeline used to connect the three can constitute a first loop.

[0041] In this example, when the three-way valve 10 is in the first state and the pumping device 20 is in the open state, the coolant in the first circuit is heated by the heat absorbed by the first heat exchange device 30 to achieve heat transfer from the first heat exchange device 30 to the coolant in the first circuit.

[0042] Here, the first state means that both the first port 11 and the second port 12 are open and the third port 13 is closed.

[0043] According to the heating system 100 of the present invention, by setting up the above-mentioned first circuit, the cooling waste heat after cooling performed by the first heat exchange device which is not associated with the gear box can be fully utilized to heat the coolant flowing in the first circuit, so as to realize the heat transfer of the cooling waste heat, thereby making sufficient preparations for the subsequent heating of the lubricating oil of the gear box (reserving more heat).

[0044] As an example, the three-way valve 10 , the pumping device 20 , the first heat exchange device 30 , the second heat exchange device 50 , and pipelines for connecting the four may constitute a second circuit.

[0045] In this example, the coolant in the second circuit, having absorbed heat, transfers heat to the gearbox 40 when the three-way valve 10 is in the second state, so as to heat the lubricating oil of the gearbox 40 .

[0046] Here, the second state indicates that both the first port 11 and the third port 13 are open and the second port 12 is closed.

[0047] According to the heating system 100 of the present invention, by providing the above-mentioned second circuit, it is possible to make the heated coolant flow through the heat exchange device associated with the gearbox to heat the lubricating oil of the gearbox, so as to successfully make the heat exchange device unrelated to the gearbox also indirectly serve as a heater for the lubricating oil of the gearbox.

[0048] In addition, when the heating system 100 also includes other devices located on the second circuit (for example, other devices that achieve heat exchange via the second heat exchange device (for example, but not limited to, the generator in the cabin), or other devices that are additionally equipped with other heat exchange devices), the heated coolant in the second circuit can heat the other devices in addition to heating the lubricating oil of the gearbox.

[0049] As an example, the coolant in the second circuit that has absorbed heat also transfers heat to another device (for example, other devices that achieve heat exchange via the second heat exchange device (for example, but not limited to, a generator in the cabin), or other devices that are additionally equipped with other heat exchange devices) when the three-way valve (10) is in the second state.

[0050] According to an embodiment of the present invention, as an example of a device providing heat to the first heat exchange device, a grid-side module, one end of which is connected to the power grid, can be used as the device providing heat to the first heat exchange device. In other words, the first heat exchange device 30 can be further coupled to the grid-side module, which is used to provide heat to the first heat exchange device 30.

[0051] As an example, see Figure 6 , Figure 6 : is an example circuit diagram showing a grid-side module corresponding to the first heat exchange device according to an embodiment of the present utility model. Figure 6 As shown, the device that provides heat to the first heat exchange device can be implemented as grid-side modules P3 and P1, and grid-side modules P3 and P1 are connected to the power grid via a transformer. Specifically, the power grid is connected to terminal 1 of a transformer (for example, but not limited to, a box-type transformer), and terminal 2 of the transformer is connected to terminal 1 of grid-side module P1 and terminal 1 of grid-side module P3.

[0052] For example, the grid-side module can be implemented as a converter, etc.

[0053] As an example of a connection relationship, refer to Figure 2 According to an embodiment of the present invention, the first heat exchange device 30 may include a first group of heat exchange devices 301 and a second group of heat exchange devices 302. It should be noted that in the present invention, the number of "groups" may represent at least one.

[0054] like Figure 2 As shown, one end 3011 of the first heat exchange device 301 is the first end 31 of the first heat exchange device 30, the other end 3012 of the first heat exchange device 301 is connected to one end 3021 of the second heat exchange device 302, and the other end 3022 of the second heat exchange device 302 is the second end 32 of the first heat exchange device 30.

[0055] As another example of a connection relationship, refer to Figure 3 According to an embodiment of the present invention, the first heat exchange device 30 may include a first group of heat exchange devices 301 and a second group of heat exchange devices 302 .

[0056] For example, it can correspond to Figure 6 Two groups of network side modules P3 and P1 are shown.

[0057] like Figure 3 As shown, one end 3011 of the first group of heat exchange devices 301 and one end 3021 of the second group of heat exchange devices 302 are connected to each other to correspond to the first end 31 of the first heat exchange device 30, and the other end 3012 of the first group of heat exchange devices 301 and the other end 3022 of the second group of heat exchange devices 302 are connected to each other to correspond to the second end 32 of the first heat exchange device 30.

[0058] That is to say, the first heat exchange device in the present invention includes at least two groups of devices, and the two groups of heat exchange devices are connected in series or in parallel.

[0059] By configuring the first heat exchange device to include at least two groups of devices, the heat exchange efficiency can be improved. When multiple groups of first heat exchange devices are configured, the heating efficiency achieved through heat exchange can be improved, thereby further shortening the heating time.

[0060] Furthermore, as an example, if the heat absorbed by one set of heat exchangers is a first reactive energy and the heat absorbed by another set of heat exchangers is a second reactive energy, the relationship between the first reactive power corresponding to the first reactive energy and the second reactive power corresponding to the second reactive energy is equal in magnitude and opposite in sign. This setting prevents adverse effects on the grid, such as voltage or current fluctuations, thereby ensuring grid-side operational stability.

[0061] In addition, as an example, the heating system 100 according to the embodiment of the present invention may further include a first temperature sensor 60. For example, referring to Figure 4 , a first temperature sensor 60 may be installed in the first circuit and used to detect the temperature of the coolant in the first circuit.

[0062] In addition, as an example, the heating system 100 according to the embodiment of the present invention may further include a second temperature sensor 70. For example, referring to Figure 4 The second temperature sensor 70 may be disposed in a flow path of the lubricating oil of the gear box 40 to detect the temperature of the lubricating oil of the gear box 40 .

[0063] According to an embodiment of the present invention, the heating system 100 may be used in a wind turbine generator set, that is, the wind turbine generator set may include the heating system 100 .

[0064] As an example, a wind turbine generator set may include: a transformer, one end of the transformer is connected to the power grid, the other end of the transformer is connected to the converter, the converter includes at least one grid-side module, and a heating system for the gearbox as described above, the grid-side module provides heat to the heating system to heat the lubricating oil of the gearbox.

[0065] Refer to the following Figure 7 and Figure 8 An example structure of a heating system for a gearbox and an example process for implementing a heating process according to an embodiment of the present invention are described below. Figure 7 is a structural block diagram showing a specific example of a heating system for a gear box according to an embodiment of the present invention, and Figure 8 It is the use of Figure 7 A schematic flow chart of a specific example of implementing a heating process.

[0066] Here, as an example, Figure 7 and Figure 8 The processing flow can be applied to the scenario of the fan including the above heating system, and the following can be used as an example to explain it in detail. Figure 7 and Figure 8 In the embodiment, the coolant flowing in each pipe may be water, but the present invention is not limited thereto.

[0067] Reference Figure 7 An example of a heating system for a gearbox according to an embodiment of the present invention may include: a water pump P2, a three-way valve F2, water-cooled plates B1 and B2, and an oil-water heat exchanger B3 (associated with the gearbox G1).

[0068] In addition, the water cooling plates B1 and B2 can cool the grid-side modules P3 and P1 respectively to absorb heat therefrom for subsequent transfer of heat to the gearbox G1.

[0069] Reference Figure 8 ,use Figure 7 The system to achieve gearbox lubricating oil heating process may include:

[0070] In block 510 , it is determined whether there is a need for a low-temperature start-up of the wind turbine generator set (here, the term “start-up” is used because the generator set has not yet been operated).

[0071] In box 520, the water pump P2 is turned on and the three-way valve F2 is closed (at this time, the valve port of the three-way valve F2 connected to the oil-water heat exchanger B3 is closed, and at the same time the other two valve ports of the three-way valve F2 are opened), so that the water circulation direction is water pump P2 → water cooling plate B1 → water cooling plate B2 → three-way valve F2 → water pump P2 (which can be referred to as the first loop).

[0072] That is, the first circuit may be composed of the water-cooling plates B1 and B2, the three-way valve F2, the water pump P2, and the pipeline connecting the three.

[0073] In block 530 , the grid-side module P1 and the grid-side module P3 are started, so that the grid-side modules P1 and P3 respectively generate reactive energy and the corresponding reactive powers are equal in magnitude and opposite in sign.

[0074] For example, the grid-side module P1 generates positive reactive power of Q1, and the grid-side module P3 generates negative reactive power of Q1, which can make the reactive power presented by the unit relative to the grid zero, thereby not affecting the normal operation of the grid.

[0075] In block 540 , the reactive current generated in block 530 causes losses in the grid-side modules P1 and P3 . Heat corresponding to the losses is transferred to the first circuit through the water cooling plates B1 and B2 , thereby increasing the temperature of the water flowing in the circuit.

[0076] In box 550, when the water temperature rises to the threshold temperature T1, the three-way valve F2 is opened, so that the circulation direction of the heated water changes to water pump P2 → water cooling plate B1 → water cooling plate B2 → three-way valve F2 → oil-water heat exchanger B3 → water pump P2 (which can be referred to as the second loop).

[0077] That is, the second circuit may be composed of the water-cooling plates B1 and B2, the three-way valve F2, the oil-water heat exchanger B3, the water pump P2, and the pipelines connecting the four.

[0078] In block 560 , the oil-water heat exchanger B3 heats the lubricating oil in the gearbox G1 , causing the oil temperature of the lubricating oil to increase.

[0079] In block 570 , when the temperature of the lubricating oil in the gearbox G1 reaches the threshold temperature T2 (eg, the starting temperature), the water pump P2 is turned off and the grid side modules P1 and P3 are stopped from operating, ie, the grid side modules P1 and P3 stop generating reactive power.

[0080] At block 580 , the unit may now be started / activated normally.

[0081] In the above example, in the scenario of low-temperature startup of the unit, the heat carried by the heated coolant (used to cool the heat exchange device not associated with the gearbox) is used to heat the gearbox lubricating oil. This can greatly reduce the time taken to start the unit in a low-temperature environment and save related costs.

[0082] According to the heating system of the gearbox of the present invention, by cooling the heat exchange device not associated with the gearbox, the heat of the heated coolant is transferred to the heat exchange device associated with the gearbox, thereby heating the gearbox lubricating oil, thereby achieving the beneficial effect of greatly improving the heating power of the gearbox without increasing the cost.

[0083] On the other hand, the heating system of the gearbox according to the embodiment of the present invention, when applied to a wind turbine generator set, can greatly shorten the low-temperature start-up time of the set without increasing the cost, and increase the power generation of the set, compared with the traditional heating system of the gearbox used in the set.

[0084] On the other hand, in the scenario where the heating system of the gearbox according to the embodiment of the present invention is applied to the ETOP unit (a unit in which the electrical cabinets in the unit, such as the converter cabinet, the transformer cabinet, etc., are integrated into the cabin), the cooling waste heat of the cooling system corresponding to the converters connected in parallel, for example, arranged in the cabin of the unit can be fully utilized, and the coolant carrying the cooling waste heat is controlled by the pumping device and the three-way valve to flow through the heat exchanger associated with the gearbox to achieve heating of the gearbox lubricating oil, thereby indirectly using the cooling system of the converter as a heater for the gearbox lubricating oil.

[0085] In addition, when the heating system of the gearbox according to the embodiment of the present invention is further applied to the scenario of the ETOP unit that can operate in extreme climatic conditions (such as desertification), the heating power of the gearbox can be greatly improved (for example, increased by more than twenty-five times) without increasing the cost, which greatly shortens the start-up time of the ETOP unit in extremely cold climatic conditions, thereby increasing the unit's operating time and improving the unit's power generation.

[0086] Although certain exemplary embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes and modifications may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A heating system for a gearbox, characterized in that: Used for heating the lubricating oil in the gear box, the heating system comprises a three-way valve (10), a pumping device (20), a first heat exchange device (30) and a second heat exchange device (50), The outlet (21) of the pumping device (20) is connected to the first end (31) of the first heat exchange device (30) for absorbing heat, the inlet (22) of the pumping device (20) is connected to the first end (51) of the second heat exchange device (50) for transferring heat to the gear box (40), the first port (11) of the three-way valve (10) is connected to the second end (32) of the first heat exchange device (30), the second port (12) of the three-way valve (10) is connected to the inlet (22) of the pumping device (20), and the third port (13) of the three-way valve (10) is connected to the second end (52) of the second heat exchange device (50).

2. The heating system according to claim 1, characterized in that The three-way valve (10), the pumping device (20), the first heat exchange device (30), and the pipeline for connecting the three constitute a first loop. The coolant in the first circuit is heated by the heat absorbed by the first heat exchange device (30) when the three-way valve (10) is in a first state and the pumping device (20) is in an open state, so as to achieve heat transfer from the first heat exchange device (30) to the coolant in the first circuit, wherein the first state indicates that both the first port (11) and the second port (12) are open and the third port (13) is closed.

3. The heating system according to claim 1, characterized in that The three-way valve (10), the pumping device (20), the first heat exchange device (30), the second heat exchange device (50), and the pipeline for connecting the four constitute a second circuit. The coolant in the second circuit, which has absorbed heat, transfers heat to the gearbox (40) when the three-way valve (10) is in a second state, so as to heat the lubricating oil of the gearbox (40), wherein the second state indicates that both the first port (11) and the third port (13) are open and the second port (12) is closed.

4. The heating system according to claim 1, characterized in that The first heat exchange device (30) includes a first group of heat exchange devices (301) and a second group of heat exchange devices (302). wherein one end (3011) of the first group of heat exchange devices (301) is the first end (31) of the first heat exchange device (30), the other end (3012) of the first group of heat exchange devices (301) is connected to one end (3021) of the second group of heat exchange devices (302), and the other end (3022) of the second group of heat exchange devices (302) is the second end (32) of the first heat exchange device (30).

5. The heating system according to claim 1, characterized in that The first heat exchange device (30) includes a first group of heat exchange devices (301) and a second group of heat exchange devices (302), wherein one end (3011) of the first group of heat exchange devices (301) and one end (3021) of the second group of heat exchange devices (302) are connected to each other to correspond to the first end (31) of the first heat exchange device (30), and the other end (3012) of the first group of heat exchange devices (301) and the other end (3022) of the second group of heat exchange devices (302) are connected to each other to correspond to the second end (32) of the first heat exchange device (30).

6. The heating system according to claim 2, characterized in that The heating system further includes a first temperature sensor (60) installed in the first circuit and used to detect the temperature of the coolant in the first circuit.

7. The heating system according to claim 1, characterized in that The heating system further includes a second temperature sensor (70) disposed in a flow path of the lubricating oil of the gear box (40) to detect the temperature of the lubricating oil of the gear box (40).

8. The heating system according to claim 1, wherein: The first heat exchange device (30) is connected to a network-side module, and the network-side module is used to provide heat to the first heat exchange device (30).

9. A wind turbine generator set, characterized in that: The wind turbine generator set comprises: A transformer, one end of which is connected to the grid, and the other end of which is connected to a converter, wherein the converter includes at least one grid-side module, and According to any one of claims 1 to 8, the grid-side module provides heat to the heating system to heat the lubricating oil of the gearbox.

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