CN114320765A

CN114320765A - Yaw supporting and driving method for floating type wind turbine generator

Info

Publication number: CN114320765A
Application number: CN202011081550.2A
Authority: CN
Inventors: 崔新维; 崔逸南
Original assignee: Suzhou Xinsanli Wind Power Technology Co ltd
Current assignee: Suzhou Xinsanli Wind Power Technology Co ltd
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2022-04-12

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

Yaw supporting and driving method for floating type wind turbine generator

Technical Field

The invention relates to a yaw supporting and driving method for a floating type wind turbine generator, and belongs to the technical field of wind power generation.

Background

Compared with onshore wind power, offshore wind power has two obvious advantages: 1) the wind resources are more sufficient, stronger and more stable; 2) because coastal cities are densely populated, the distance between the coastal cities and an electric load center can be shortened, and the investment for constructing electric energy transmission lines is reduced. Wherein the wind resources of the deep/open sea are superior compared to offshore. Therefore, the current global trend of wind energy utilization can be summarized from land to sea and from offshore to open sea.

Due to the high cost of foundation construction in construction, wind farms with water depths over 50 meters (open sea) usually do not use fixed foundations. For the development and utilization of deep sea/open sea wind energy, the floating foundation becomes a main technical route adopted by offshore wind generating sets. Long-term operational testing results of the Hywind project in scotland have shown that the power generation efficiency of wind turbines using floating foundations is much higher than that of offshore fixed foundation wind turbines. Consistent with onshore wind power, minimization of electricity consumption cost is also a goal pursued by offshore wind power development. For the research and development and manufacture of wind power equipment, the maximization of the single machine capacity of the unit is the most effective way for reducing the electricity consumption cost. Thus, large/ultra-large offshore floating wind turbines naturally become a necessary result of the development of wind power technology. However, as the capacity of the wind turbine increases, the diameter of the impeller and the load level increase continuously, and the weight of the wind turbine is larger and larger (the total weight of the impeller and the engine room reaches nearly 600 tons in a 10 MW-level wind turbine), which puts higher requirements on yaw supporting and driving of the large/ultra-large wind turbine. Therefore, it becomes significant to develop a new yaw supporting and driving method for floating offshore wind turbines.

CN 110043425 a discloses an active yaw system for a floating multi-impeller wind turbine, wherein two ends of a support structure (tower) of the wind turbine are connected with a power device under water through inhaul cables, and a yaw power placing point in the design is located in front of a floating foundation of the wind turbine, so that two main problems exist: the risk of overturning of the unit is increased in the yawing process; the stay cable and the impeller are prone to interference.

Disclosure of Invention

The invention aims to provide a yaw supporting and driving method of a floating offshore wind generating set, which replaces the existing yaw slewing supporting method applied to a connecting part between a cabin and the top end of a tower so as to greatly reduce the cost of a yaw system.

The scheme of the yaw supporting and driving method for the floating type wind turbine generator is as follows:

the tower of the wind generating set is mechanically connected with the floating foundation, and the connection point can be a central column or a vertical column of the floating foundation. Only one wind generating set or a plurality of wind generating sets can be arranged on one floating foundation. The tower and the upper part of the wind generating set yaw together with the main body of the floating foundation, and the yaw support is realized by the floating foundation.

The mooring rope and the floating foundation are connected through a coupling mechanism, and the number of the coupling mechanisms can be only one or more. Each coupling mechanism can be connected with only one mooring rope or can be simultaneously connected with a plurality of mooring ropes, and the floating foundation body and the mooring ropes 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 carry out shaft navigation movement so as to realize wind alignment.

The invention has the beneficial effects that: the natural supporting effect formed by the floating foundation and the seawater is utilized, so that a supporting part required in a yawing system is omitted, and the cost of the unit yawing system is reduced.

Drawings

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

FIG. 1 is a side view of a floating wind turbine generator system;

FIG. 2 is a schematic view of a floating foundation and a plurality of wind generating sets;

FIG. 3 is a schematic view of a floating foundation with a plurality of mooring line coupling mechanisms mounted at the bottom;

fig. 4 is a schematic view of a mooring line coupling mechanism installed at the bottom of a floating foundation.

In the figure, 1-a wind generating set, 2-a tower, 3-a floating foundation body, 4-a mooring rope, 5-a mooring rope coupling mechanism, 6-a driving device and 7-a track.

It is noted that the above-described figures are intended to illustrate the features of the invention and are not intended to show any actual structure or to reflect the details of the dimensions, relative proportions, etc. of the various components. In order to more clearly illustrate the principles of the present invention and to avoid obscuring the same in unnecessary detail, the examples in the drawings have been simplified. These illustrations do not present an inconvenience to those skilled in the relevant art (wind power generation) in understanding the present invention, and more components may be included in an actual multi-floating wind power generation set.

Detailed Description

The invention adopts the following specific implementation scheme:

as shown in figure 1, the tower (2) of the wind generating set (1) is mechanically connected with the floating foundation, and the connection point can be a central column of the floating foundation or components such as a vertical column or a floating box according to the number, the capacity, the types of the tower and the floating foundation and other factors of the wind generating set. There may be only one wind turbine generator set on the floating foundation or multiple wind turbine generator sets (as shown in fig. 2). The joint of the engine room and the tower of each wind generating set is not provided with a yaw slewing bearing, the tower (2) and the parts above the tower of each wind generating set and the floating foundation main body (3) perform yaw together, and the yaw bearing is realized by the floating foundation and seawater.

The mooring rope (4) mainly comprises a steel cable, an anchor chain and a seabed pile chain, and the mooring rope (4) is anchored on the seabed by an anchoring system. The mooring rope (4) is connected with the floating foundation through a coupling mechanism, and the coupling mechanism (5) can be only one or a plurality of. Each coupling mechanism can be connected with only one mooring rope (4) or can be simultaneously connected with a plurality of mooring ropes (4). The floating foundation body (3) and the mooring rope (4) can rotate relatively.

When there are a plurality of coupling mechanisms (5), as shown in fig. 3, the coupling mechanisms (5) can move along the rails (7) provided on the sides or under the floating base body (3) or at other positions. Due to the fixation of the mooring rope (4), when the floating foundation body (3) carries out yaw axis movement, the mooring rope (4) and the coupling mechanism (5) of the floating foundation move on the track (7) relative to the floating foundation body (3).

When there is only one coupling means (5), as shown in fig. 4, the coupling means (5) is located under the floating base body (3), and the coupling means (5) is designed such that the fixed end of the floating base body (3) and the coupling end of the mooring rope (4) can be rotated relatively.

The floating foundation body (3) is provided with a plurality of driving devices (6) (such as propellers) underwater, and when the wind turbine generator has a yaw demand, the driving devices (6) drive the floating foundation body (3) and the wind turbine generator to perform yaw motion to realize wind.

The embodiments described in this patent are some, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims

1. The tower of the wind generating set is mechanically connected with the floating foundation, the connecting point can be a central column or an upright column of the floating foundation, and only one wind generating set or a plurality of wind generating sets can be arranged on one floating foundation.

2. According to the description of claim 1, the tower and the upper part of the wind generating set are yawed together with the main body of the floating foundation, and the yaw support is realized by the floating foundation.

3. According to the description of claim 2, the mooring ropes are connected with the floating foundation through a coupling mechanism, the coupling mechanism can be only one, or a plurality of, each coupling mechanism can be connected with only one mooring rope, or can be simultaneously connected with a plurality of mooring ropes, and the floating foundation body and the mooring ropes can rotate relatively.

4. According to the description of claim 3, the floating foundation body is provided with a plurality of driving devices (such as propellers) under water, and when the wind generating set has a yaw requirement, the driving devices drive the floating foundation body and the wind generating set to carry out shaft motion so as to realize wind alignment.