Wind turbine generator hyperbolic type tower design method based on frequency control and tower

Abstract

The invention discloses a wind turbine generator hyperbolic type tower design method based on frequency control and a tower. The method comprises the following steps that the total height, wall thickness and maximum diameter of the hyperbolic type tower are determined; a plurality of groups of hyperbolic focal points and a half-real axis length are initialized, frequency and intensity requirementsserve as constraint conditions, optimization is carried out on the basis of a particle swarm multi-objective optimization method, and the optimal solution of the hyperbolic focal points and the semi-real axis length is obtained; and the number of tower sections of the tower is set, and the size of each tower section is obtained based on the optimal solution and the number of the tower sections. The external shape of the wind power tower meeting various frequency requirements can be designed, and the lightweight design of the weight of the tower can be guaranteed.

Description

technical field [0001] The disclosure belongs to the technical field of wind power generation, and in particular relates to a frequency control-based design method for a hyperbolic tower of a wind turbine and the tower. Background technique [0002] Resonance is a phenomenon in which a physical system vibrates at a particular frequency with a greater amplitude than other frequencies. The resonance of the fan is manifested by the intersection or overlap of the excitation frequency of the impeller rotation and the natural frequency of the tower. Every time when the speed of the wind rotor runs in the resonance range, the fan will vibrate violently and trigger the shutdown of the unit. Long-term operation will affect The amount of power generated by the unit will also lead to disasters such as damage to the tower and blade breakage. With the increase of domestic installed capacity, there are fewer and fewer places with good wind resources and convenient installation. In order ...

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Problems solved by technology

The resonance of the fan is manifested by the intersection or overlap of the excitation frequency of the impeller rotation and the natural frequency of the tower. Every time when the speed of the wind rotor runs in the resonance range, the fan will vibrate violently and trigger the shutdown of the unit. Long-term operation will affect The power generation of the unit will also cause damage to the tower, blade breakage and other disasters

With the increase of domestic installed capacity, there are fewer and fewer places with good wind resources and convenient installation. In order to compensate for the increase in costs caused by poor wind resources, wind farm owners often need larger diameter rotors and higher tower to make up for the insufficient power generation caused by small wind rotor diameter and low tower height fan, and according to the requirements of transportation conditions, the external diameter of the general tower should not exceed 4.5m, according to the design requirements of the unit to avoid resonance , the vibration-avoiding interval between the tower frequency and the blade rotation frequency must exceed at least 5%, all of which have brought severe challenges to the design and operation of current wind turbines

The key points that affect the tower frequency mainly include the tower material, structural size, external shape, etc., and when the tower material and structural size are determined, the external shape of the tower has a greater impact on the frequency of the tower, and the existing The structural forms of wind power towers in the market mainly include full-cone, variable-cone, and straight-cone. The current tower structure cannot fully match the requirements of the current wind farm market for towers, that is, in the case of ensuring that the transportation conditions are not limited Next, the height of the tower should be high, the weight should be light, and the frequency range should meet the requirements of safe operation of the unit

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