阅读说明：本技术 一种多叶轮风电系统使用的叶轮旋转方向的配置方式 (Configuration mode of impeller rotating direction used by multi-impeller wind power system ) 是由 崔逸南 崔新维 于 2020-05-13 设计创作，主要内容包括：本发明公开了一种多叶轮风电系统使用的叶轮旋转方向的配置方式,多叶轮风力发电系统是将多行小机组安装在同一个支撑结构中实现风能到电能转换的系统。多叶轮风力发电系统任意一行中的相邻两个小机组的叶轮采用了相反的旋转方向,这样可以使得偏航方向的合成弯矩减小,进而降低整个机组的合成偏航阻力矩,达到降低机组偏航系统成本的目的。(The invention discloses a configuration mode of the rotation direction of an impeller used by a multi-impeller wind power system. The impellers of two adjacent small units in any row of the multi-impeller wind power generation system adopt opposite rotating directions, so that the synthetic bending moment in the yawing direction can be reduced, the synthetic yawing resistance moment of the whole unit can be reduced, and the aim of reducing the unit yawing system cost is fulfilled.)

1. The small units (1) are arranged in rows and fixed on a supporting structure (3) of the multi-impeller wind power generation system, and all the small units (1) in any row (2) are all upwind units or all downwind units.

2. According to the description in claim 1, the impellers of two small units (1) adjacent to each other in any row (2) use opposite rotation directions, i.e. the impellers of the small units (1) at intervals rotate in the same direction (both counterclockwise and clockwise).

Technical Field

The invention belongs to the technical field of wind power generation, and relates to a configuration mode of an impeller rotating direction applied to a multi-impeller wind power generation system.

Background

The development of wind power is the most effective way to solve the problem of unit development cost. The continuous development of offshore wind power projects makes the unit become a necessary development trend in large-scale. With the increase of the capacity of the unit, the challenge of upgrading the traditional wind turbine with a single impeller is more and more serious, the load of the unit is increased sharply, and the overlong and overweight blades and the overlarge torque bring a lot of difficulties to the design, the production, the manufacture, the installation and the like of each component (such as a variable pitch actuating mechanism, a supporting structure and the like) in the unit.

A multi-impeller wind power generation system is a system for realizing conversion from wind energy to electric energy by mounting a plurality of rows of small units in the same supporting structure. Compared with a traditional wind turbine with a single impeller, the multi-impeller wind power generation system does not need to use ultra-long and ultra-heavy blades, avoids the occurrence of ultra-large torque, and provides another feasible way for the large-scale offshore wind turbine and the reduction of the development cost of the turbine.

Yaw of a multi-impeller structure is more prone to adopt overall yaw, that is, all impellers are driven by a support structure to yaw together (if the impellers are singly or locally yawed, the problem that the downwind impeller is shielded by an upwind unit to lose power generation amount occurs). Compared with a single impeller wind turbine generator set with the same power generation capacity, the whole yaw needs huge yaw driving force. The method for simply enhancing the driving force of the yaw actuating mechanism has high difficulty in engineering realization and can greatly increase the unit cost.

CN 205533018U, CN 107407259 a, CN 102322399 a, CN 102305186A, CN 102269113A, CN 102269111 a, CN 102305171 a, CN 102305172A, CN 102305185A and CN 102322397A all propose forms of multiple-bladed wind generators. The yaw function referred to in these patents is simply a pure integral yaw.

CN 205533018U discloses a multiple-impeller wind power generator. There is no strategy for the auxiliary impeller to yaw with the main impeller in this patent, nor is there any claim concerning the direction of rotation of the impeller.

CN 108368821 a, CN 110691905 a, and CN 107429661 a all propose that a wind power plant comprises a plurality of wind turbine systems arranged in rows and columns. The yawing function in these inventions is yawing by multiple converters of the same local support mechanism, and there is no specific description concerning any single impeller rotation direction.

CN 109219701 a discloses a multi-rotor wind turbine. The invention generates a self-yaw method by combining the upwind fan and the downwind fan, but the self-yaw method is not suitable for a large-scale multi-rotor wind turbine generator set with active yaw.

CN 108368822 a describes a wind turbine system comprising a plurality of wind turbine modules. The method of coordinating the rotational speeds of the plurality of rotors according to the present invention does not have an effect on the yaw function.

Disclosure of Invention

Aiming at the problem of large yaw resistance moment of a multi-impeller wind power generation system during integral yaw, the invention provides a configuration mode of the rotation direction of the impeller, and the bending moment of the local support structure in the yaw direction is reduced by adopting different steering methods through different impellers, so that the synthetic yaw resistance moment of the whole system is reduced. .

The technical scheme adopted in the impeller rotation direction configuration of the multi-impeller wind power generation system is as follows:

a plurality of small units (1) are arranged in rows and fixed on a supporting structure (3) of the multi-impeller wind power generation system. All the small units (1) in any row (2) are all upwind units or all downwind units.

The impellers of two adjacent small units (1) in any row (2) use opposite rotating directions, namely the rotating directions of the impellers of the small units (1) at intervals are the same (both anticlockwise or clockwise).

The invention has the beneficial effects that: the invention provides a configuration mode for the rotation direction of the impeller in the multi-impeller wind power generation system, and the mode can reduce the yaw resistance moment of a local support structure, further reduce the synthesized yaw resistance moment of the whole unit and achieve the purpose of reducing the unit yaw system cost.

Drawings

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

FIG. 1 is a front view of a portion of a multi-bladed wind power system;

FIG. 2 is a top view of a portion of a multi-bladed wind power system. .

In the figure, 1-small unit, 2-line small unit and 3-supporting structure.

Detailed Description

The drawings are intended to depict only typical features of the invention, and are not intended to show any actual structure or detail herein, including dimensions, relative proportions, etc., of the various elements. 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 an actual multiple-bladed wind power generation system may include more components.

The invention adopts the following specific implementation scheme:

the small units (1) (generally comprising impellers, a main shaft and a generator) are fixed on a supporting structure (3) of the multi-impeller wind power generation system in a row arrangement, and the supporting structure (3) can adopt a spatial three-dimensional truss structure.

The impeller parts of all the small units (1) of the wind power generation system can adopt the same blades, and different blades can also be used. As shown in fig. 1, if the impeller (impeller n) of a small unit rotates clockwise (in front view), the impeller (impeller n-1) of the small unit adjacent to the small unit rotates counterclockwise, and the impellers of other small units in any row (2) rotate in the same order. The impeller (such as the impeller n in fig. 1) of the small unit rotates counterclockwise (front view), and the impeller (the impeller n-1) of the adjacent unit rotates clockwise, and the like.

When the rotation directions of the impellers of two adjacent small units are completely opposite, the attack angles of each of the two corresponding blades of the two adjacent small units under the same azimuth angle when each of the two blades is stressed are theoretically opposite, so that the moment component of the aerodynamic load applied to the impellers in the yaw direction can be offset.

As shown in fig. 2, when there is normally no yaw error, the wind direction is shown by solid arrows, and each small unit (1) is called an upwind unit; when no yaw error exists normally, the wind direction is shown by a dotted arrow, and each small unit (1) is called a downwind unit; all the small units (1) on the same row (2) are both upwind units or downwind units.