CN114320765A - A yaw support and driving method for floating wind turbine - Google Patents

Abstract

The invention discloses a yaw supporting and driving method for a floating type wind turbine generator. The tower and the parts above the tower of the wind generating set and the main body of the floating foundation perform yawing together, and the yawing support is realized by a floating body of the floating foundation. The mooring rope is connected with the coupling mechanism of the floating foundation, and the floating foundation body and the mooring rope can rotate relatively. The floating foundation main body is provided with a plurality of driving devices (such as propellers) underwater, and when the wind turbine generator has a yaw demand, the driving devices drive the floating foundation main body and the wind turbine generator to perform yaw motion to realize wind. The invention utilizes the buoyancy of the floating foundation and the seawater, saves a supporting part in the traditional yaw system and reduces the cost of the yaw system of the unit.

Description

A yaw support and driving method for floating wind turbine

technical field

The invention relates to a yaw support and driving method for a floating wind turbine, belonging to the technical field of wind power generation.

Background technique

Compared with onshore wind power, offshore wind power has two obvious advantages: 1) wind resources are more abundant, stronger and more stable; 2) due to the dense population of coastal cities, it can shorten the distance from the power load center and reduce construction Input of power transmission lines. Among them, the wind resources of deep sea/distant sea are more excellent than that of offshore sea. Therefore, the current global development trend of wind energy utilization can be summarized as shifting from onshore to offshore, and from offshore to far-sea.

Due to the high cost of foundation construction during construction, (offshore) wind farms with a water depth of more than 50 meters usually do not use fixed foundations. Then, for the development and utilization of wind energy in deep sea/distant sea, floating foundation has become the main technical route adopted by offshore wind turbines. Long-term operational test results at the Hywind project in Scotland have shown that wind turbines with floating foundations are much more efficient than offshore fixed foundation wind turbines. Consistent with onshore wind power, minimizing the cost of electricity is also the goal of offshore wind power development. For the R&D and manufacturing of wind power equipment, the large-scale unit capacity is the most effective way to reduce the cost of electricity. In this way, large/super-large offshore floating wind turbines have naturally become the inevitable result of the development of wind power technology. However, as the capacity of the unit increases, the diameter of the impeller and the load level continue to increase, and the weight of the wind turbine becomes larger and larger (for a 10MW unit, the total weight of the impeller and nacelle reaches nearly 600 tons), which is very important for large-scale wind turbines. /The yaw support and drive of super-large wind turbines put forward higher requirements. Therefore, it is of great significance to develop a new yaw support and drive method for floating offshore wind turbines.

CN 110043425 A discloses an active yaw system for floating multi-impeller wind turbines. Both ends of the supporting structure (tower) of the unit are connected to the power device located underwater through cables. In this design, the yaw power The placement point is located in front of the floating foundation of the unit, and there are two main problems: the risk of the unit overturning during the yaw process is increased; the cable and the impeller are prone to interference.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a yaw bearing and driving method for floating offshore wind turbines, which can replace the yaw slewing bearing method currently used in the connection between the nacelle and the top of the tower, so as to greatly reduce the cost of the yaw system.

A scheme for a yaw support and driving method for a floating wind turbine is:

The tower of the wind turbine is connected with the floating foundation in a certain mechanical way, and the connection point can be the central column or the vertical column of the floating foundation. A floating foundation can have only one wind turbine or multiple wind turbines. The tower and the above part of the wind turbine and the main body of the floating foundation are yawed together, and the yaw support is realized by the floating foundation.

The mooring cable is connected with the floating foundation through a coupling mechanism, and there may be only one coupling mechanism or multiple coupling mechanisms. Each coupling mechanism can be connected with only one mooring rope, or can be connected with multiple mooring ropes at the same time, and the floating foundation main body and the mooring rope can rotate relative to each other.

The floating base body is provided with multiple driving devices (such as propellers) underwater. When the wind turbine has a yaw demand, the driving device drives the floating base body and the wind turbine to carry out the axis motion to achieve the wind.

The beneficial effects of the present invention are: utilizing the natural supporting effect formed by the floating foundation and the sea water, the supporting components required in the yaw system are omitted, and the cost of the yaw system of the unit is reduced.

Description of drawings

Specific embodiments are now described by way of example with reference to the accompanying drawings, in which:

Figure 1 is a side view of a floating wind turbine;

Figure 2 is a schematic diagram of a floating foundation and a plurality of wind turbines;

Figure 3 is a schematic diagram of a plurality of mooring cable connection mechanisms installed at the bottom of the floating foundation;

Figure 4 is a schematic diagram of a mooring cable coupling mechanism installed at the bottom of the floating foundation.

In the figure, 1 - wind turbine, 2 - tower, 3 - floating foundation body, 4 - mooring cable, 5 - mooring cable connection mechanism, 6 - driving device, 7 - track.

It should be noted that the above drawings are used to illustrate the features of the present invention, and are not intended to show any actual structure or to reflect detailed information such as dimensions, relative proportions and the like of various components. In order to more clearly illustrate the principles of the invention, and to avoid obscuring the principles of the invention with unnecessary detail, the examples in the figures have been simplified. These illustrations will not cause inconvenience to those skilled in the related art (wind power generation) in understanding the present invention, and an actual multi-floating wind turbine may include many more components.

Detailed ways

The specific embodiment adopted in the present invention is:

As shown in Figure 1, the tower (2) of the wind turbine (1) is mechanically connected to the floating foundation. It is the central column of the floating foundation, and can also be components such as columns or floating boxes. There can be only one wind turbine on the floating foundation, or there can be multiple wind turbines (as shown in Figure 2). There is no yaw slewing bearing at the connection between the nacelle of the wind turbine and the tower. The tower (2) and the above part of each wind turbine and the main body of the floating foundation (3) are yawed together. The yaw support is supported by the floating foundation and seawater. accomplish.

The mooring line (4) is mainly composed of steel cable, anchor chain and seabed pile chain, and the mooring line (4) is anchored on the seabed by the anchoring system. The mooring cable (4) is connected with the floating foundation through a coupling mechanism, and there may be only one coupling mechanism (5) or multiple coupling mechanisms. Each coupling mechanism can be connected with only one mooring rope (4), or can be connected with multiple mooring ropes (4) at the same time. The floating foundation body (3) and the mooring line (4) can rotate relative to each other.

As shown in Figure 3, when there are multiple coupling mechanisms (5), the rails (7) provided on the side or under the floating base body (3) or at other positions, the coupling mechanisms (5) can move along the rails (7) . Due to the fixation of the mooring cable (4), when the floating foundation body (3) moves on the yaw axis, the coupling mechanism (5) between the mooring cable (4) and the floating foundation is on the track (7) relative to the floating foundation body ( 3) Movement occurs.

As shown in Figure 4, when there is only one coupling mechanism (5), the coupling mechanism (5) is located below the floating base body (3), and the coupling mechanism (5) is designed so that the fixed end of the floating base body (3) is in contact with the floating base body (3). The coupling ends of the mooring lines (4) can rotate relative to each other.

The floating base body (3) is provided with a plurality of driving devices (6) (such as propellers) underwater. When the wind turbine has a yaw demand, the driving device (6) drives the floating base body (3) and the wind turbine to yaw Movement is achieved against the wind.

The embodiments described in this patent are some, but not all, of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Claims (4)

1. The tower of the wind turbine is connected with the floating foundation in a certain mechanical way. The connection point can be the central column or the column of the floating foundation. A floating foundation can have only one wind turbine or multiple wind turbines. 2 . According to the description of claim 1 , the tower and the above parts of the wind turbine and the main body of the floating foundation are yawed together, and the yaw support is realized by the floating foundation. 3. According to the description of claim 2, the mooring rope is connected with the floating foundation through a coupling mechanism, and there can be only one coupling mechanism or multiple coupling mechanisms. Connected to the mooring line, the floating foundation body and the mooring line can rotate relative to each other. 4. According to the description of claim 3, the floating foundation body is provided with a plurality of driving devices (such as propellers) underwater, and when the wind turbine has a yaw demand, the driving device drives the floating foundation body and the wind turbine to carry out the axis motion. achieve against the wind.

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