TW201512530A - Wind turbine system and emplacement/export method of transformer wherein - Google Patents

Abstract

The present invention provides a wind power generator system that does not cause a problem in terms of the strength of a wind turbine tower, enables a transformer cooling oil to be efficiently cooled, suppresses a temperature increase inside the wind turbine tower, and achieves an improvement in reliability without the need to increase the size of a hatch, said hatch being used for installing a transformer inside a wind turbine tower or for replacing the transformer, even when a system has a transformer installed at the bottom inside a wind turbine tower. This wind power generator system is installed at the bottom inside a wind turbine tower, and is equipped with: a transformer comprising an iron core and windings that are immersed in a cooling oil; and a heat exchange means for cooling the cooling oil of the transformer by means of heat exchange. A chamber having an air-tight structure partitioned by partition walls is formed at the bottom of the wind turbine tower, the iron core and windings of the transformer are immersed in the cooling oil and housed in the chamber having the air-tight structure, and a carry-in/out hatch for carrying in/out the iron core and windings is formed on an adjoining side surface of the wind turbine tower to the chamber having the air-tight structure.

Description

Wind power generation system and its transformer moving in and out method

The present invention relates to a wind power generation system and a transformer loading and unloading method thereof, and more particularly to a wind power generation system and a transformer loading and unloading method suitable for a transformer provided in a lower portion of a wind turbine tower.

In a wind power generation system, when power generated by the power is sent to the system, the transformer is generally used for boosting.

In particular, in a small- or medium-sized wind power generation system with a power generation capacity of approximately 2 MW or less, a transformer for boosting is integrated with a generator, and is installed in a nacelle installed at the top of a wind turbine tower, but is installed at sea or the like. In a large-scale wind power generation system of about 5 MW, the size and weight of the transformer will increase. Therefore, the transformer system is usually separated from the generator in the engine room, and is built in and placed inside the base of the lower portion of the windmill tower.

A transformer for boosting a large-scale wind power generation system has a large amount of heat generation due to power loss, and therefore it is necessary to apply an efficient cooling method. In particular, in the case of large-capacity transformers, it is to ensure 1 The electrical insulation between the secondary winding and the secondary winding, and is usually a so-called oil-immersed transformer, which uses mineral oil, eucalyptus oil, etc. in the cooling medium, and is filled with the cooling oil of the mineral oil, eucalyptus oil, and the like. The oil tank is immersed in a transformer body formed by a core and a winding.

In the method of cooling the cooling oil such as the above-mentioned mineral oil or eucalyptus oil, the cooling oil is circulated to a radiator connected to the oil sump, and the temperature of the cooling oil is lowered by heat exchange with the surrounding air. Other than the air-cooling type, for example, it is described in Patent Document 1.

Patent Document 1 discloses that a transformer body in which an iron core and a winding are immersed in cooling oil and housed in an oil sump is provided in a lower portion of a wind turbine tower of an offshore wind power generation system, and iron of the transformer body is housed therein. A water-cooled heat exchanger is connected to the oil groove of the core and the winding, whereby the water-cooled heat exchanger exchanges heat between the cooling oil in the oil tank and the seawater to cool the cooling oil.

Further, Patent Document 2 discloses a cooling device for a wind power generation system without using cooling oil. That is, in Patent Document 2, it is disclosed that a transformer formed of a core and a winding is provided in a protective case provided at a lower portion of a windmill tower, and air is circulated in a pipe connected to the protective case, and For the transformer to cool.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Publication No. 2013-24177

[Patent Document 2] Japanese Patent Application Publication No. 2011-530185

However, the oil-immersed transformer used in the wind power generation system of Patent Document 1 can be cooled by sea water efficiently by using a water-cooled heat exchanger instead of air cooling, but the oil-immersed transformer is like It has always been necessary to arrange the iron core and the winding in the oil tank in the state of the wind turbine tower or to exchange it in the windmill tower. To install the oil-immersed transformer in the windmill tower or exchange it in the windmill tower, it is necessary to The side surface of the windmill tower is larger than the loading and unloading port of the oil tank (hereinafter referred to as a hatch). However, there is a problem in that the strength of the windmill tower is ensured under the provision of the hatch, and there is a limit in the size of the transformer that can be installed in the wind turbine tower.

On the other hand, the transformer for the wind power generation system described in Patent Document 2 is only required to be carried in and out of the transformer body formed by the iron core and the winding in the protective case provided in the wind turbine tower. Compared with the case of Patent Document 1, it can be set or exchanged for a large transformer. However, there is a problem in that the insulation and cooling of the cooling oil by the iron core and the winding cannot be performed, and thus there is a limit in the capacitance of the transformer to be used.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wind power generation system and a transformer loading and unloading method thereof. Even if a transformer is installed in a lower portion of a wind turbine tower, it is not necessary to increase the size of the transformer. Set in a windmill tower or at a windmill tower The hatch for internal exchange does not cause the problem of the strength of the windmill tower, and it can efficiently cool the cooling oil of the transformer, suppress the temperature rise in the windmill tower, and improve the reliability.

In order to achieve the above object, a wind power generation system according to the present invention includes: a nacelle in which a rotor is mounted and a generator that is connected to a rotating shaft of the rotor; and a wind turbine tower that supports the nacelle at the top; Provided on the lower portion of the windmill tower, formed by a core and a winding, and immersed in the cooling oil, and connected to the electric generator through the electric wire in the wind turbine tower, and is powered by the generator. a transformer for boosting power; and a heat exchange means for cooling the iron core impregnated with the transformer and the cooling oil of the winding and the cooling oil for heat exchange; forming a borrowing wall at a lower portion of the wind turbine tower In the room of the closed structure, the iron core and the winding of the transformer are immersed in the cooling oil and housed in the sealed structure room, and are formed on the side surface of the wind turbine tower adjacent to the sealed structure room. The iron core and the winding inlet and outlet of the transformer are carried in and out.

Further, in order to achieve the above object, the wind power generation system of the present invention includes: a nacelle in which a rotor is mounted and a generator that is connected to a rotating shaft of the rotor; and a wind turbine that supports the nacelle at the top a tower; disposed at a lower portion of the windmill tower, formed by an iron core and a winding, and immersed in the cooling oil, and connected to the electric generator through the electric wire in the wind turbine tower, and hair a transformer for boosting electric power; and a heat exchange means for cooling the iron core impregnated with the winding and the cooling oil for winding and heat-exchanged with the cooling oil; forming a detachment at a lower portion of the wind turbine tower A room with a wall and a closed structure is provided with a lifting means on the bottom surface of the room having the closed structure, and is impregnated by the transformer formed by the iron core and the winding on the lifting means in the room of the sealed structure. In the side surface of the wind turbine tower directly above the room in the closed structure, the iron core and the winding inlet of the transformer which are moved up and down by the lifting means are formed.

Further, in order to achieve the above object, a method for loading and unloading a transformer of a wind power generation system according to the present invention is characterized in that the wind power generation system includes a generator in which a rotor is attached and a generator connected to a rotating shaft of the rotor is housed a nacelle; a windmill tower supporting the nacelle at the top; disposed at a lower portion of the windmill tower, formed by an iron core and a winding, which are immersed in the cooling oil and simultaneously passed through the aforementioned wind turbine tower a transformer for connecting a power line and boosting power generated by the power generator, and a heat exchange for cooling the iron core impregnated with the transformer and the cooling oil for cooling with the cooling oil In the wind power generation system, a room having a sealed structure partitioned by a partition wall is formed in a lower portion of the wind turbine tower, and in the sealed structure room, the iron core and the winding of the transformer are immersed in the cooling oil and stored. At the same time, the iron core and the winding of the transformer are carried in and out of the side surface of the wind turbine tower adjacent to the airtight structure. Inlet, when loading, unloading the transformer, the transformer is provided in the construction of the tower of the wind turbine In the case of the iron core and the winding, the iron core and the winding of the transformer are fixed to the room of the sealed structure from the loading and unloading port, and then the winding of the transformer is connected to the primary side and the secondary side wire. Then, the above-described carry-out port is sealed, and the cooling oil is supplied from the oil supply port to the room of the sealed structure, and the iron core and the winding of the transformer are carried out in the case of the sealed structure. After the cooling oil is discharged from the oil discharge port, the primary side and secondary side electric wires are detached from the winding of the transformer, and then the carry-out port is opened, and the core and the winding of the transformer are carried out from the carry-out port. line.

According to the present invention, even if the transformer is installed in the lower portion of the wind turbine tower, there is no need to increase the size of the hatch for installing the transformer in the wind turbine tower or in the wind turbine tower, and the strength of the wind turbine tower is not caused. At the same time, it is possible to efficiently cool the cooling oil of the transformer, suppress the temperature rise in the wind turbine tower, and improve the reliability. Therefore, it is very effective for such a wind power generation system.

1‧‧‧Wind Tower

2‧‧‧Transformers

2a‧‧‧ iron core

2b‧‧‧ Winding

2c‧‧1 times side wire

2d‧‧‧2 side wires

2e‧‧‧ casing

3‧‧‧Transformer storage room

3a‧‧‧Supply port

3b‧‧‧ oil drain

3c‧‧‧ oil storage tank

4‧‧‧ partition wall

5‧‧‧Water-cooled heat exchanger

6‧‧‧Oil piping

7‧‧‧Seawater piping

8‧‧‧Power conversion machine

9‧‧‧Generator

10‧‧‧ Gearbox

11‧‧‧Rotor blades

11a‧‧‧Rotor

12‧‧‧Cabin

13‧‧‧ radiator

14‧‧‧Fan

15‧‧‧ hatches

16‧‧‧ Lifting means

16a‧‧‧Location of the bottom of the transformer storage compartment

16b‧‧‧The location of the upper level of the transformer storage room

20‧‧‧ oil tank

21‧‧‧Wires in the windmill tower

22‧‧‧Cooling oil

23‧‧‧ seawater

24‧‧‧Pipe for oil or oil drain

Fig. 1 is a longitudinal cross-sectional view showing the entire configuration of a first embodiment of a wind power generation system according to the present invention.

Fig. 2 is a longitudinal cross-sectional view showing a lower portion of a windmill tower in the case of the first embodiment of the wind power generation system of the present invention.

Fig. 3 is a cross-sectional view taken along line A-A' of Fig. 2 .

Fig. 4 is a longitudinal cross-sectional view showing a lower portion of a windmill tower in the case of the second embodiment of the wind power generation system of the present invention.

Fig. 5 is a longitudinal cross-sectional view showing a lower portion of a windmill tower in the case of the third embodiment of the wind power generation system of the present invention.

Fig. 6 is a longitudinal cross-sectional view showing a lower portion of a windmill tower in the case of the fourth embodiment of the wind power generation system of the present invention.

Fig. 7 is a longitudinal cross-sectional view showing a lower portion of a windmill tower in the case of the fifth embodiment of the wind power generation system of the present invention.

Fig. 8 is a longitudinal cross-sectional view showing a lower portion of a windmill tower in a conventional wind power generation system.

Fig. 9 is a cross-sectional view taken along line A-A' of Fig. 8.

Hereinafter, a wind power generation system and a transformer loading and unloading method thereof according to the present invention will be described based on the illustrated embodiments. In addition, in the respective embodiments, the same symbols are used for the same members.

[Example 1]

Embodiment 1 of the wind power generation system of the present invention is illustrated in Figs. 1, 2 and 3.

As shown in the figure, the wind power generation system of the present embodiment is basically constituted by a rotor 11a in which a nacelle 12 of a generator 9 connected to a rotating shaft of the rotor 11a is housed; the nacelle 12 is at the top. The wind turbine tower 1 supported by the unit is installed inside the lower portion of the wind turbine tower 1 and is formed by the iron core 2a and the winding 2b. These are immersed in the cooling oil 22 and pass through the generator 9 and the wind turbine tower 1 at the same time. The electric wire 21 is connected to the transformer 2 for boosting the electric power generated by the generator 9; and the cooling oil 22 and the cooling oil 22 for the iron core 2a and the winding 2b impregnated with the transformer 2; A water-cooled heat exchanger 5 for heat exchange by heat exchange.

More specifically, the top of the windmill tower 1 is equipped with a nacelle 12 that is rotatable in the horizontal direction, and the nacelle 12 is attached with a rotor 11a to which the rotor blades 11 are fixed. The rotor 11a is connected to the generator 9 via a gearbox 10 with its rotating shaft. The electric power generated by the generator 9 is sent to the power conversion device 8 provided at the lower portion of the wind turbine tower 1 through the electric wires 21 in the wind turbine tower 1, and the electric power conversion device 8 converts the electric power into three-phase communication at the commercial frequency. .

In addition, the fan 14 for cooling is provided in the upper part of the power conversion device 8, and the three-phase alternating current of the commercial frequency converted by the power conversion device 8 is connected to the core 2a and the winding by the primary side electric wire 2c. The secondary winding of the transformer 2 formed by the wire 2b is sent to the electric power system through the secondary side electric wire 2d through the secondary side electric wire 2d which is boosted by the transformer 2.

Then, in the present embodiment, in the lower portion of the windmill tower 1, a transformer storage chamber 3 in a room of a closed structure partitioned by the partition wall 4 is formed, and the iron core 2a and the winding 2b of the transformer 2 are immersed in a transformer. The cooling oil 22 having the function of insulation and cooling is housed in the transformer storage chamber 3, and is adjacent to the wind turbine tower of the transformer storage chamber 3. The side surface of the first side is formed with a hatch 15 for loading and unloading the iron core 2a of the transformer 2 and the loading and unloading port of the winding 2b.

The opening of the hatch 15 that carries in and out of the iron core 2a and the winding 2b of the transformer 2 adjacent to the side surface of the wind turbine tower 1 of the transformer storage chamber 3 is provided with a core 2a and a winding including the transformer 2. The shape and size of the 2b section. Further, the transformer storage chamber 3 is provided with an oil pipe 6, which is connected to the water-cooled heat exchanger 5 disposed adjacent to each other.

In the above-described water-cooled heat exchanger 5, the seawater pipe 7 is connected, and the seawater pipe 7 is taken out of the outside of the windmill tower 1 and then opened below the sea level, and is installed inside the water-cooled heat exchanger 5 The seawater 23 sucked by the suction means such as pumping is circulated in the water-cooled heat exchanger 5.

Further, the water-cooled heat exchanger 5 is a shell-and-tube heat exchanger or a plate-type heat exchanger which is supported in a plurality of parallel bodies in a cylindrical body (housing). a tube is stored and passed through the inner and outer sides of the tube. The plate heat exchanger adopts a plurality of flat plates arranged to form a flow path and high temperature fluid and low temperature fluid on both sides of the plate. The way the interaction flows.

As a result, heat generated by the power loss of the transformer 2 causes the cooling oil 22 whose temperature rises and the low-temperature seawater 23 to exchange heat inside the water-cooled heat exchanger 5, so that the temperature of the cooling oil 22 is lowered. The iron core 2a of the transformer 2 and the winding 2b are cooled.

In addition, the core 2a and the winding 2b of the transformer 2 are housed The upper part of the transformer storage chamber 3 is provided with one or more oil supply or draining pipes 24 for supplying or discharging the cooling oil 22, and the oil supply or oil discharge pipe 24 is connected to the wind turbine tower 1 The oil supply port 3a and the oil discharge port 3b of the side wall of the sea level are opened to the outside of the windmill tower 1 by the oil supply port 3a and the oil discharge port 3b.

In addition, the secondary side electric wire 2d is connected to a power system having a high voltage exceeding several thousand V, and is taken out from the transformer storage chamber 3 to the outside through the casing 2e provided in the partition wall 4. Further, in the present embodiment, the position of the transformer storage chamber 3 in the wind turbine tower 1 is not particularly limited, but in the case of being applied to a floating type offshore wind power generation system, as shown in FIG. The center portion of the windmill tower 1 makes it easy to ensure the balance.

Next, a method of loading and unloading a transformer of the wind power generation system according to the present embodiment will be described.

In the present embodiment, the loading and unloading of the transformer 2 when the transformer 2 is installed in the wind turbine tower 1 or exchanged in the wind turbine tower 1 is performed in the following order.

First, when the iron core 2a and the winding 2b of the transformer 2 are provided in the windmill tower 1 at the time of construction of the windmill tower 1, the iron core 2a and the winding 2b of the transformer 2 are carried into the transformer storage chamber 3 from the hatch 15 After the fixing, the primary side electric wire 2c and the secondary side electric wire 2d are connected to the winding 2b of the transformer 2. Thereafter, the hatch 15 is sealed, and the cooling oil 22 is supplied from the oil supply port 3a into the transformer storage chamber 3.

On the other hand, the core 2a of the transformer 2 and the winding 2b In order to carry out the exchange, the cooling oil 22 in the transformer storage chamber 3 is first discharged from the oil discharge port 3b, and the primary side electric wire 2c and the secondary side electric wire 2d are disconnected from the winding 2b of the transformer 2. Thereafter, the hatch 15 is opened, and the iron core 2a and the winding 2b of the transformer 2 are carried out from the hatch 15 to the outside of the windmill tower 1.

After the iron core 2a and the winding 2b of the transformer 2 are carried out from the hatch 15 to the outside of the windmill tower 1, the iron core and the winding of the new transformer are carried from the hatch 15 into the transformer storage chamber 3, and then In the same order as in the construction of the windmill tower 1 described above, a new transformer core and winding are provided.

Here, in order to clarify the effects in the configuration of the present embodiment, a conventional example will be described with reference to FIGS. 8 and 9 and will be described in comparison with the present embodiment. The same components as those in FIGS. 1 to 3 of the present embodiment are denoted by the same reference numerals, and the detailed description thereof will be omitted.

In the conventional example shown in FIG. 8 and FIG. 9, the transformer 2 formed of the core 2a and the winding 2b is housed in the oil groove 20 filled with the cooling oil 22, and is taken from the hatch 15 It is carried in and out of the windmill tower 1. The radiator 13 is connected to the side surface of the oil groove 20, and the cooling oil 22 is circulated in the radiator 13, and the cooling oil 22 is cooled by the air circulating in the wind turbine tower 1 by the action of the fan 14 or the like.

In the conventional example, when the iron core 2a in which the transformer 2 and the oil groove 20 of the winding 2b are housed in the wind turbine tower 1, the first is The radiator 13 is carried into the wind turbine tower 1 from the hatch 15, and then the oil sump 20 is carried in from the hatch 15. Thereafter, the radiator 13 is connected to the oil groove 20 in the wind turbine tower 1, and the loading of the transformer 2 is completed. On the other hand, when the transformer 2 is carried out, the radiator 13 is first removed from the oil sump 20 in the wind turbine tower 1, and is carried out from the hatch 15 in the order of the oil groove 20 and the radiator 13.

Therefore, in the conventional example, the opening of the hatch 15 provided on the side surface of the windmill tower 1 needs to have the shape and size of the cross section of the oil groove 20.

On the other hand, the opening of the hatch 15 in the case of the present embodiment shown in FIGS. 2 and 3 is only the shape and size of the cross section of the core 2a and the winding 2b of the transformer 2. The following effects are obtained: it is possible to be smaller than the conventional example, and it is easy to ensure the strength of the windmill tower 1.

Further, in the present embodiment, when the opening of the hatch 15 is the same size as the conventional example, the transformer 2 that can be carried in the windmill tower 1 can be increased in size as compared with the conventional example. In this case, the iron core 2a of the transformer 2 has a smaller saturation magnetic flux density than the conventional electromagnetic steel sheet, and has no load loss (iron loss), and can be carried out by a transformer using, for example, an amorphous magnetic material. The efficiency of the power generation system has greatly increased the effect.

According to the present embodiment, when the transformer 2 for a large-scale wind power generation system is installed in the wind turbine tower 1 or exchanged in the wind turbine tower 1, the iron core of the transformer 2 is carried in and out. In the case of the transformer 2a and the winding 2b, the hatch 15 provided on the side surface of the wind turbine tower 1 can be miniaturized, and the strength of the wind turbine tower 1 can be easily secured. In addition, the water-cooling heat exchanger 5 can efficiently cool the cooling oil 22 by the seawater 23, so that not only the transformer 2, but also the temperature increase of the power conversion device 8 in the wind turbine tower 1 is suppressed, and the entire wind power generation system is obtained. Reliability and longevity effects.

[Embodiment 2]

In Fig. 4, a second embodiment of the wind power generation system of the present invention is illustrated. The same components as those in the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof will be omitted. In addition, in the respective drawings of the embodiment after the description, the primary side electric wire 2c, the secondary side electric wire 2d, and the sleeve 2e described in the first embodiment are omitted.

The present embodiment shown in FIG. 4 is characterized in that the heat exchange means is disposed adjacent to the transformer storage chamber 3, and the air circulating in the wind turbine tower 1 is exchanged with the cooling oil 22 to cool the cooling. Use the radiator 13 of the oil 22.

In other words, in the present embodiment, the transformer 2 formed by the core 2a and the winding 2b is placed in the transformer storage chamber 3 filled with the cooling oil 22, and the transformer storage chamber 3 and the heat dissipation are transmitted through the oil pipe 6. The device 13 is connected. Then, the cooling oil 22 in the transformer storage chamber 3 is circulated in the radiator 13, and the cooling oil 22 is cooled by the air circulating in the wind turbine tower 1 by the action of the fan 14 or the like.

In the constitution of such a embodiment as described above, the effect is also the same as that of the embodiment 1.

[Example 3]

In Fig. 5, a third embodiment of the wind power generation system of the present invention is illustrated. The same components as those in the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The present embodiment shown in FIG. 5 is characterized in that the heat exchange means is disposed adjacent to the transformer storage chamber 3, and the seawater 23 is taken into heat exchange with the cooling oil 22 to cool the water cooled by the cooling oil 22. The heat exchanger 5 and the transformer storage chamber 3 adjacent to the side opposite to the side on which the water-cooled heat exchanger 5 is disposed are disposed, and the air circulating in the wind turbine tower 1 is cooled by heat exchange with the cooling oil 22 The radiator 13 of the cooling oil 22 is used.

In other words, in the present embodiment, the transformer 2 formed by the core 2a and the winding 2b is placed in the transformer storage chamber 3 filled with the cooling oil 22, and the transformer storage chamber 3 and the heat dissipation are transmitted through the oil pipe 6. The device 13 and the water-cooled heat exchanger 5 are connected. Then, the cooling oil 22 that has been circulated in the radiator 13 is cooled by the air circulating in the wind turbine tower 1 by the action of the fan 14 or the like, and the cooling oil 22 that circulates in the water-cooled heat exchanger 5 is The seawater 23 circulating in the seawater pipe 7 is cooled.

In addition, the suction means such as a pump that circulates the seawater 23 inside the water-cooled heat exchanger 5 consumes electric power and winds The efficiency of the power generation system is lowered. Therefore, when the temperature of the cooling oil 22 is lower than a predetermined temperature, only the cooling by the radiator 13 is performed, and only the temperature of the cooling oil 22 is constant or more ( When the temperature is higher than the predetermined temperature, the pump or the like is operated, and the cooling oil 22 is circulated to the water-cooled heat exchanger 5 to exert a cooling action using the seawater 23.

In the constitution of such a embodiment as described above, the effect is also the same as that of the embodiment 1.

[Example 4]

In Fig. 6, a fourth embodiment of the wind power generation system of the present invention is illustrated. The same components as those in the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The present embodiment shown in FIG. 6 is characterized in that the transformer storage chamber 3 is provided with an oil reservoir 3c that communicates with the transformer storage chamber 3 and supplies oil to the transformer storage chamber 3.

That is, in the present embodiment, the oil reservoir 3c is provided directly above the transformer housing chamber 3 in which the iron core 2a of the transformer 2 and the winding 2b are housed. The oil reservoir 3c is connected to the oil supply port 3a provided on the side wall of the wind turbine tower 1 at the sea level, and the transformer storage chamber 3 is connected to the oil discharge port 3b.

According to the configuration of the present embodiment, it is possible to obtain the same effects as those of the first embodiment, and it is also possible to reduce the amount of the cooling oil 22 in the transformer accommodation chamber 3 or the case of the exchange transformer 2. The cooling oil 22 is supplied from the oil storage tank 3c, so that it becomes unnecessary to change. The effect of transporting the cooling oil 22 during maintenance or exchange of the press 2 is achieved.

[Example 5]

In Fig. 7, a fifth embodiment of the wind power generation system of the present invention is illustrated. The same components as those in the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The embodiment shown in FIG. 7 is characterized in that a transformer storage compartment 3 partitioned by a partition wall 4 is formed in a lower portion of the windmill tower 1, and a lifting means is provided on the bottom surface of the transformer storage compartment 3 (for example, an elevator) In the transformer storage chamber 3, the transformer 2 formed by the core 2a and the winding 2b is immersed in the cooling oil 22 and housed in the transformer storage chamber 3, and the wind turbine is placed on the upper side of the transformer storage chamber 3. The side surface of the tower 1 is formed with a hatch 15 of the iron core 2a and the winding 2b of the transformer 2 that is carried in and out by the loading/unloading and lifting means 16.

In other words, in the present embodiment, the elevating means 16 is provided on the bottom surface of the transformer accommodating chamber 3 which is filled with the cooling oil 22 and has a closed structure, and the elevating means 16 is provided with the core 2a and the winding 2b. Transformed into a transformer 2. When the iron core 2a of the transformer 2 is exchanged with the winding 2b, the cooling oil 22 in the transformer storage chamber 3 is first discharged from the oil discharge port 3b, and the lifting means 16 is taken from the bottom surface 16a of the transformer storage chamber 3. It rises to the position 16b of the upper layer. Thereafter, the iron core 2a of the transformer 2 and the winding 2b are carried out from the hatch 15 provided on the side surface of the wind turbine tower 1 on the upper side of the transformer storage chamber 3.

Next, the core and winding of the new transformer are taken from the hatch 15 It is carried in and placed on the elevation means 16 at the position 16b of the upper side of the transformer storage chamber 3, and is fixed. After that, the lifting means 16 is lowered to the position 16a of the bottom surface of the transformer storage chamber 3, and wiring is performed. Then, the cooling oil 22 is filled in the transformer storage chamber 3 from the oil supply port 3a, and the core 2a and the winding 2b of the transformer 2 are filled. The exchange job ends.

In addition, in FIG. 7, the upper part of the transformer storage chamber 3 of the transformer 2 is opened, but in the case of a floating-type wind turbine tower, the leakage of the cooling oil 22 by the influence of the shaking can be imagined. Therefore, it is also possible to adopt a configuration in which a cover member or the like is provided on the upper portion of the transformer storage chamber 3 for the purpose of preventing this.

In the constitution of such a embodiment as described above, the effect is also the same as that of the embodiment 1.

Further, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments are described in detail to explain the present invention in an easy-to-understand manner, and are not limited to those having all of the components described. Further, a part of the configuration of the embodiment may be replaced with a configuration of another embodiment, and a configuration of another embodiment may be added to the configuration of a certain embodiment. Further, a part of the configuration of each embodiment may be added, deleted, or replaced with another configuration.

1‧‧‧Wind Tower

2‧‧‧Transformers

2a‧‧‧ iron core

2b‧‧‧ Winding

2c‧‧1 times side wire

2d‧‧‧2 side wires

2e‧‧‧ casing

3‧‧‧Transformer storage room

3a‧‧‧Supply port

3b‧‧‧ oil drain

4‧‧‧ partition wall

5‧‧‧Water-cooled heat exchanger

6‧‧‧Oil piping

7‧‧‧Seawater piping

8‧‧‧Power conversion machine

14‧‧‧Fan

15‧‧‧ hatches

22‧‧‧Cooling oil

23‧‧‧ seawater

24‧‧‧Pipe for oil or oil drain

Claims (15)

A wind power generation system comprising: a nacelle equipped with a rotor and a generator that is connected to a rotating shaft of the rotor; a windmill tower supporting the nacelle at the top; and being disposed inside the lower portion of the windmill tower a transformer formed by an iron core and a winding, which is immersed in the cooling oil, and is connected to the electric generator through the electric wire in the wind turbine tower, and is boosted by electric power generated by the generator; and a heat exchange means for cooling the iron core immersed in the transformer and the cooling oil of the winding and the cooling oil for heat exchange; and a room having a sealed structure partitioned by a partition wall is formed in a lower portion of the wind turbine tower; In the room of the sealed structure, the iron core and the winding of the transformer are immersed in the cooling oil and housed, and the iron that carries in and out the transformer is formed on the side surface of the wind turbine tower adjacent to the sealed structure room. The core and the winding are moved into the outlet. The wind power generation system according to claim 1, wherein the heat exchange means is a water-cooled heat exchanger, and the water-cooled heat exchanger is disposed adjacent to a room of the sealed structure, and takes in seawater and the cooling. The aforementioned cooling oil is cooled by heat exchange with oil. The wind power generation system according to claim 1, wherein the heat exchange means is a radiator that is disposed adjacent to a room of the sealed structure, and circulates air in the wind turbine tower and the cooling The cooling oil is cooled by heat exchange with oil. The wind power generation system of claim 1, wherein the heat exchange means is a water-cooled heat exchanger and a radiator. The water-cooled heat exchanger is disposed adjacent to the room of the sealed structure, and the seawater is exchanged with the cooling oil to cool the cooling oil, and the radiator is adjacent to the side where the water-cooled heat exchanger is disposed. The opposite side of the room having the closed structure is disposed, and the air circulating in the wind turbine tower is exchanged with the cooling oil to cool the cooling oil. The wind power generation system according to claim 4, wherein, when the temperature of the cooling oil is lower than a predetermined temperature, the cooling oil is circulated only in the radiator to circulate in the wind turbine tower When the cooling oil is at a predetermined temperature or higher, the cooling oil is circulated only in the water-cooled heat exchanger to perform cooling using seawater. The wind power generation system according to any one of claims 1 to 5, wherein the iron core and the winding inlet of the transformer formed on the side surface of the wind turbine tower adjacent to the room of the airtight structure are carried in and carried out The opening portion has a shape and a size including a cross section of the iron core and the winding of the transformer. The wind power generation system according to any one of the first to sixth aspects of the present invention, wherein at least one is connected to a room in which the iron core and the winding of the transformer and the sealed structure of the cooling oil are filled. The oil supply pipe and the oil discharge pipe are connected to the oil supply port and the oil discharge port provided on the side wall of the wind turbine tower, and open to the outside of the wind turbine tower. For example, the wind power generation system of claim 2, wherein In the room of the sealed structure, an oil reservoir that communicates with the room of the closed structure and can supply oil to the sealed structure can be provided. The wind power generation system according to claim 8, wherein the oil storage tank is connected to an oil supply port provided on a side wall of the wind turbine tower, and the sealed structure room is connected to an oil discharge port provided on a side wall of the wind turbine tower. . A wind power generation system comprising: a nacelle equipped with a rotor and a generator that is connected to a rotating shaft of the rotor; a windmill tower supporting the nacelle at the top; and being disposed inside the lower portion of the windmill tower a transformer formed by an iron core and a winding, which is immersed in the cooling oil, and is connected to the electric generator through the electric wire in the wind turbine tower, and is boosted by electric power generated by the generator; and a heat exchange means for cooling the core of the transformer and the cooling oil for winding and heat-exchanged with the cooling oil; and forming a closed structure room partitioned by a partition wall in a lower portion of the wind turbine tower; The bottom surface of the room having the closed structure is provided with a lifting means, and the transformer formed by the iron core and the winding is immersed in the cooling oil in the room of the sealed structure, and is housed in the cooling oil. The side surface of the wind turbine tower directly above the room in the closed structure is formed with a core of the transformer that carries in and out and moves up and down by the lifting means The line moved into the outlet. The wind power generation system of claim 10, wherein the heat exchange means is a water-cooled heat exchanger, the water-cooled heat The exchanger is disposed adjacent to the room of the sealed structure, and the seawater is taken in heat exchange with the cooling oil to cool the cooling oil. The wind power generation system according to claim 10, wherein the opening and the opening of the iron core and the winding inlet of the transformer formed on the side surface of the wind turbine tower adjacent to the airtight tower in the room of the airtight structure are carried in and out. The shape and size of the cross section including the core and the winding of the transformer are included. The wind power generation system according to any one of claims 10 to 12, wherein at least one room is connected to a room in which the iron core and the winding of the transformer and the sealed structure of the cooling oil are filled. The oil supply pipe and the oil discharge pipe are connected to the oil supply port and the oil discharge port provided on the side wall of the wind turbine tower, and open to the outside of the wind turbine tower. A method for loading and unloading a transformer of a wind power generation system, characterized in that the wind power generation system includes: a nacelle in which a rotor is mounted and a generator that is connected to a rotating shaft of the rotor; and the nacelle is supported at the top a windmill tower; the inside of the lower portion of the windmill tower is formed by an iron core and a winding, and is immersed in the cooling oil, and is connected to the electric generator through the electric wire in the wind turbine tower, and a transformer for boosting electric power generated by a motor; and a heat exchange means for cooling the iron core impregnated with the winding and the cooling oil for winding and heat-exchanged with the cooling oil; the wind power generation system is the windmill The lower part of the tower In the room of the closed structure in which the partition wall is partitioned, the iron core and the winding of the transformer are immersed in the cooling oil and housed in the room of the closed structure, and the side of the wind turbine tower adjacent to the airtight structure in the room of the closed structure In the case where the iron core and the winding of the transformer are installed during the construction of the wind turbine tower, the iron core and the winding inlet and outlet of the transformer are carried in and out, and the iron core and the winding of the transformer are installed during the construction of the wind turbine tower. The inlet is fixed to the iron core and the winding of the transformer in the room having the sealed structure, and then the winding of the transformer is connected to the primary side and the secondary side electric wire, and then the carry-out port is sealed, and the sealed structure is sealed. The room supplies the cooling oil from the oil supply port, and when the iron core and the winding of the transformer are carried out, the cooling oil in the sealed structure is discharged from the oil discharge port. The primary side and secondary side electric wires are detached from the winding of the transformer, and then the loading and unloading port is opened and the aforementioned loading and unloading port is carried out. The core and winding of the transformer. The method of loading and unloading a transformer for a wind power generation system according to claim 14, wherein the iron core and the winding of the transformer are carried out from the loading and unloading port by opening the loading and unloading port, and then the core and winding of the new transformer are removed. The carry-in/out port is carried into the room of the sealed structure, and then the iron core and the winding of the new transformer are installed in the same order as in the construction of the windmill tower.