Wind turbine

Abstract

The utility model discloses a wind driven generator, including tower drum and frame, the frame is installed at the top of tower drum, its characterized in that, the wind driven generator still includes frequency conversion power supply and low frequency transformer, be equipped with first connecting structure on the frequency conversion power supply, the lower extreme of frame is equipped with second connecting structure, first connecting structure with second connecting structure can detachable installation, low frequency transformer can detachable installation in the base of frame or tower drum. The utility model discloses a low frequency transformer is set up to the power generation of wind driven generator and can reduce the transportation cost, the low frequency transformer and frequency conversion power supply with the unit whole machine are set up into several parts of detachable separation and are installed respectively, can adopt different transportation, installation scheme according to need, and can avoid using super large hoisting equipment, reduced the transportation, installation cost of wind driven generator in the far sea area.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation equipment, specifically to a wind turbine generator. Background Technology

[0002] For wind turbine generators, the normal grid connection frequency is 50Hz. With the development of offshore wind power, the distance from shore increases, raising the cost of AC power transmission at the industrial frequency, and DC transmission solutions are also very expensive. In deep-sea areas, low-frequency transmission is cheaper to construct than industrial frequency transmission, and low-frequency turbine generators are generally preferred. However, using low-frequency generators not only increases the size and weight of the transformer, but also requires an additional frequency converter to power the generator's own equipment, significantly increasing the overall structure and weight of the generator. Furthermore, in deep-sea areas, ultra-large hoisting equipment is not only expensive but also inconvenient to use. Utility Model Content

[0003] The technical problem this utility model aims to solve is that existing wind turbine generator sets installed in deep-sea areas have a large overall structure and weight when using low-frequency units, which makes installation inconvenient and incurring high hoisting costs. The present invention provides a wind turbine generator in which the low-frequency transformer and frequency converter are set as several detachable and separable parts of the generator set for separate installation, thus avoiding the use of ultra-large hoisting equipment.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] This utility model provides a wind turbine generator, including a tower and a frame. The frame is installed at the top of the tower. The wind turbine generator also includes a frequency converter and a low-frequency transformer. The frequency converter is provided with a first connection structure, and the lower end of the frame is provided with a second connection structure. The first connection structure and the second connection structure are detachable and installable.

[0006] The low-frequency transformer can be detachably installed on the frame or the base of the tower.

[0007] In this scheme, by setting up a low-frequency transformer to transmit the power generated by the wind turbine, the transmission cost can be reduced. The low-frequency transformer and frequency converter are set up as several detachable parts of the unit and installed separately. Different transportation and installation schemes can be adopted as needed, and the use of ultra-large hoisting equipment can be avoided, thereby reducing the transportation and installation costs of the wind turbine in deep-sea areas.

[0008] Preferably, the frame includes a front frame and a rear frame, the rear frame including two parallel longitudinal beams, and the second connecting structure is provided between the two longitudinal beams.

[0009] Preferably, the second connection structure includes a first mounting beam and a second mounting beam, the two ends of the first mounting beam and the second mounting beam are respectively connected to the two longitudinal beams, and the first mounting beam and the second mounting beam are spaced apart along the length direction of the longitudinal beams.

[0010] The above structure is used in this solution to ensure the stability of the frequency converter installation.

[0011] Preferably, a third connecting structure is also provided on the two longitudinal beams. The third connecting structure is located at the end of the second connecting structure away from the front frame, and the low-frequency transformer is detachably installed on the third connecting structure.

[0012] Preferably, the low-frequency transformer includes a first transformer and a second transformer, the first transformer and the second transformer are respectively disposed at one end of the two longitudinal beams near the front frame, and the low-frequency transformer is located between the frequency converter and the front frame.

[0013] In this solution, the low-frequency transformer is divided into two transformers, which reduces the weight and volume of a single transformer and facilitates hoisting.

[0014] Preferably, the low-frequency transformer includes a first transformer and a second transformer, which are mounted on a bottom platform inside the tower.

[0015] In this scheme, the low-frequency transformer is divided into two transformers and installed on the bottom platform inside the tower. This avoids hoisting and also avoids the problem of insufficient space inside the tower to install a single large transformer.

[0016] Preferably, a sealed enclosure is provided on the tower platform outside the tower, and the low-frequency transformer is located inside the sealed enclosure.

[0017] In this scheme, the low-frequency transformer is placed in a sealed box on the tower platform outside the tower, which avoids hoisting and provides enough space to install the low-frequency transformer.

[0018] Preferably, the wind turbine also includes a nacelle, the frame is disposed inside the nacelle, and the frequency converter is disposed inside the nacelle.

[0019] In this solution, the frequency converter power supply is located inside the engine compartment to avoid the impact of the external environment on its service life.

[0020] Preferably, the wind turbine also includes a converter, which is mounted on the frame, and the grid side of the converter is connected to the low-voltage end of the low-frequency transformer via a cable.

[0021] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0022] The positive and progressive effects of this utility model are as follows: by setting a low-frequency transformer to transmit the power generated by the wind turbine, the transmission cost can be reduced; by setting the low-frequency transformer and frequency converter to be detachable and separable from the whole unit and installing them separately, different transportation and installation schemes can be adopted as needed, and the use of ultra-large hoisting equipment can be avoided, thus reducing the transportation and installation costs of wind turbines in deep-sea areas. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the installation of the frequency converter and low-frequency transformer in Embodiment 1 of this utility model.

[0024] Figure 2 for Figure 1 A bottom view.

[0025] Explanation of reference numerals in the attached figures:

[0026] Front rack 110

[0027] Rear frame 120

[0028] First longitudinal beam 121

[0029] Second longitudinal beam 122

[0030] Second connection structure 130

[0031] First mounting beam 131

[0032] Second mounting beam 132

[0033] Low frequency transformer 200

[0034] 300 Variable Frequency Power Supply

[0035] Converter 400 Detailed Implementation

[0036] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

[0037] Example 1:

[0038] like Figure 1-2As shown, this embodiment discloses a wind turbine generator, including a tower and a frame. The frame is installed at the top of the tower. The wind turbine generator also includes a frequency converter and a low-frequency transformer. The frequency converter 300 is provided with a first connection structure, and the lower end of the frame is provided with a second connection structure 130. The first connection structure and the second connection structure 130 are detachably installed. The low-frequency transformer 200 is detachably installed on the base of the frame or the tower.

[0039] In this embodiment, by using a low-frequency transformer 200 to transmit the power generated by the wind turbine, transmission costs can be reduced. The low-frequency transformer 200 and the frequency converter 300 are installed as separate, detachable parts of the turbine unit, allowing for different transportation and installation schemes as needed. This avoids the use of oversized hoisting equipment and reduces the transportation and installation costs of the wind turbine in deep-sea areas. The frequency converter supplies power to the wind turbine's self-use electrical equipment, including the yaw motor, cooling motor, pitch motor, cooling fan, and lubrication pump.

[0040] Specifically, the frame includes a front frame 110 and a rear frame 120. The rear frame 120 includes two parallel longitudinal beams 121 and 122, and a second connecting structure 130 is provided between the first longitudinal beam 121 and the second longitudinal beam 122.

[0041] like Figure 2 As shown, the second connecting structure 130 includes a first mounting beam 131 and a second mounting beam 132. Both ends of the first mounting beam 131 and the second mounting beam 132 are respectively connected to the first longitudinal beam 121 and the second longitudinal beam 122. The first mounting beam 131 and the second mounting beam 132 are spaced apart along the length of the longitudinal beams. A third connecting structure 140 is also provided on the first longitudinal beam 121 and the second longitudinal beam 122. The third connecting structure 140 is located at the end of the first longitudinal beam 121 and the second longitudinal beam 122 away from the front frame. The low-frequency transformer 200 is detachably mounted on the third connecting structure 140.

[0042] In this embodiment, the wind turbine also includes a nacelle, with the frame housed inside the nacelle and the frequency converter 300 located within the nacelle. Placing the frequency converter 300 inside the nacelle helps prevent external environmental factors from affecting its service life.

[0043] The wind turbine also includes a converter 400, which is mounted on the frame. The grid side of the converter 400 is connected to the low-voltage end of the low-frequency transformer 200 via a cable.

[0044] Since both the low-frequency transformer 200 and the frequency converter 300 are mounted on the rear frame 120 in this embodiment, the main structural strength of the rear frame 120 needs to be strengthened. Furthermore, due to the use of a single low-frequency transformer, the low-frequency transformer 200 is relatively large in size and weight, necessitating its placement in front of the frequency converter 300.

[0045] During installation, the low-frequency transformer 200 is located inside the engine compartment. During assembly, the lower-mounted low-frequency transformer 200 and the frequency converter 300 must be installed first, and then the engine compartment cover must be assembled.

[0046] During on-site operation and maintenance, since the transformer platform is located in the lower space of the nacelle, maintenance of the low-frequency transformer 200 can be performed by descending from the rear of the nacelle to the transformer platform. Maintenance work can also be carried out on the frequency converter 300 at the same time.

[0047] If the low-frequency transformer 200 or the frequency converter 300 fails and needs to be replaced, the low-frequency transformer 200 or the frequency converter 300 can be placed on the bottom platform of the tower and then transported to the ship for transport to the maintenance site. Then, in the same way, the new low-frequency transformer or frequency converter can be hoisted back onto the rear frame and installed and secured.

[0048] Example 2:

[0049] This embodiment shares the same structure as Embodiment 1, except that: in this embodiment, the low-frequency transformer 200 includes a first transformer and a second transformer, which are respectively located at the ends of the first longitudinal beam 121 and the second longitudinal beam 122 near the front frame 110. The low-frequency transformer 200 is situated between the frequency converter 300 and the front frame 110. By dividing the low-frequency transformer into two transformers, this embodiment reduces the weight and volume of a single transformer, facilitating hoisting.

[0050] In this embodiment, considering the weight and volume of a single low-frequency transformer, the two windings are separated into two smaller capacity transformers, which are placed near the rear frame. These two smaller transformers are then moved to the front of the frequency converter. This design reduces the weight and volume of a single transformer, offering advantages in installation and hoisting. Furthermore, this arrangement reduces the load on the rear frame, shifts the overall nacelle center of gravity forward, and improves the unit's vibration stability.

[0051] During installation, the low-frequency transformer is housed inside the nacelle. During assembly, the low-frequency transformer and frequency converter must first be installed on the rear rack, and then the nacelle cover is installed. Cables emerge from the grid side of the converter and are connected to the low-voltage side of the low-frequency transformer.

[0052] During on-site maintenance, since the low-frequency transformer is located in the space on both sides of the rear rack, maintenance can be performed by accessing the transformer space from either side of the nacelle. Maintenance of the frequency converter power supply can also be performed at the same time.

[0053] If a transformer or frequency converter fails and needs to be replaced, the low-frequency transformer or frequency converter can be placed on the bottom platform of the tower and then transported to the repair site by ship. Then, the new low-frequency transformer or frequency converter can be hoisted back onto the rear frame and installed and secured in the same manner.

[0054] In some embodiments, the frequency converter power supply may also be installed on one of the longitudinal beams of the rear frame.

[0055] Example 3:

[0056] This embodiment is the same as the other structures in Embodiment 1, except that: in this embodiment, a sealed enclosure (not shown in the figure) is provided on the tower platform outside the tower, and the low-frequency transformer is installed inside the sealed enclosure. By placing the low-frequency transformer inside the sealed enclosure on the tower platform outside the tower, hoisting is avoided, and sufficient space is provided for the installation of the low-frequency transformer.

[0057] This embodiment places the low-frequency transformer on a platform outside the tower, rather than on the nacelle. This reduces the load on the nacelle and facilitates maintenance and replacement, offering advantages in on-site installation and hoisting. Lowering the transformer effectively solves the problem of its large individual weight. Furthermore, because the sealed enclosure is located outside the tower at the base, maintenance and replacement are convenient. However, this design requires connecting the grid side of the converter to the low-voltage side of the low-frequency transformer during the overall low-frequency unit design.

[0058] During installation, the low-frequency transformer is mounted outside the tower. During on-site hoisting, the sealed enclosure of the low-frequency transformer is installed on the tower platform at the base of the tower, while the cables are simultaneously connected to the converter inside the nacelle. The frequency converter power supply is installed in the lower part of the nacelle, and existing interfaces can be reused.

[0059] During on-site operation and maintenance, the low-frequency transformer is conveniently located at the bottom of the tower for easy maintenance.

[0060] If a low-frequency transformer fails and needs to be replaced, a crane can be used to transfer the low-frequency transformer from the base of the tower to a ship and then to the repair site. The new low-frequency transformer is then moved into the sealed enclosure and secured using the same method.

[0061] Example 4:

[0062] This embodiment is the same as the other structures in Embodiment 1, except that in this embodiment, the low-frequency transformer includes a first transformer and a second transformer, which are installed on the bottom platform inside the tower. In this embodiment, dividing the low-frequency transformer into two transformers and installing them on the bottom platform inside the tower avoids both hoisting and insufficient space inside the tower to install a single, large transformer.

[0063] In this embodiment, considering the excessive weight and size of a single low-frequency transformer, the two windings are separated into two smaller transformers with lower capacity. These two smaller transformers are placed at the bottom, not on the nacelle, reducing the overall load level. After being placed at the bottom, the transformers are mounted on the platform at the base of the tower, inside the tower itself. Compared to placing them outside the tower, this two-transformer design results in a lighter and smaller individual transformer, facilitating installation and maintenance. Placing the transformers inside the tower also saves on the length of containers and low-voltage cables.

[0064] During installation, two small low-frequency transformers are mounted on the tower platform inside the tower. During assembly, the two transformers need to be pre-installed inside the tower before the tower is hoisted into place.

[0065] During on-site operation and maintenance, the low-frequency transformer is easily maintained at the base of the tower, allowing for maintenance to be carried out using the space at the base. Maintenance of the frequency converter is performed in the nacelle.

[0066] If a transformer fails and needs to be replaced, the low-frequency transformer can be removed and moved to the tower platform outside the tower, then transported to a ship and shipped to the repair site. Then, the new low-frequency transformer can be moved into the tower and installed and secured using the same method.

[0067] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A wind turbine generator, comprising a tower and a frame, wherein the frame is mounted on the top of the tower, characterized in that, The wind turbine also includes a frequency converter and a low-frequency transformer. The frequency converter is provided with a first connection structure, and the lower end of the frame is provided with a second connection structure. The first connection structure and the second connection structure are detachable and installable. The low-frequency transformer can be detachably installed on the frame or the base of the tower.

2. The wind turbine generator as described in claim 1, characterized in that, The frame includes a front frame and a rear frame. The rear frame includes two parallel longitudinal beams, and the second connecting structure is provided between the two longitudinal beams.

3. The wind turbine generator as described in claim 2, characterized in that, The second connection structure includes a first mounting beam and a second mounting beam. The two ends of the first mounting beam and the second mounting beam are respectively connected to the two longitudinal beams. The first mounting beam and the second mounting beam are spaced apart along the length direction of the longitudinal beams.

4. The wind turbine generator as described in claim 2, characterized in that, A third connecting structure is also provided on the two longitudinal beams. The third connecting structure is located at the end of the second connecting structure away from the front frame, and the low-frequency transformer is detachably installed on the third connecting structure.

5. The wind turbine generator as described in claim 2, characterized in that, The low-frequency transformer includes a first transformer and a second transformer. The first transformer and the second transformer are respectively located at one end of the two longitudinal beams near the front frame. The low-frequency transformer is located between the frequency converter and the front frame.

6. The wind turbine generator as described in claim 1, characterized in that, The low-frequency transformer includes a first transformer and a second transformer, which are installed on the bottom platform inside the tower.

7. The wind turbine generator as described in claim 1, characterized in that, A sealed enclosure is provided on the tower platform outside the tower, and the low-frequency transformer is located inside the sealed enclosure.

8. The wind turbine generator as described in claim 1, characterized in that, The wind turbine also includes a nacelle, the frame is located inside the nacelle, and the frequency converter is located inside the nacelle.

9. The wind turbine generator as described in claim 1, characterized in that, The wind turbine also includes a converter, which is mounted on the frame, and the grid side of the converter is connected to the low-voltage end of the low-frequency transformer via a cable.

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