Wind generating set tower load reduction method based on control strategy optimization

Abstract

The invention discloses a wind generating set tower load reduction method based on control strategy optimization. The method comprises the steps: optimizing an existing tower resistance increasing strategy, taking measured forward and backward acceleration of a tower as input, obtaining the tower resistance increasing compensation amount through a tower resistance increasing controller of a wind generating set, then determining and outputting the tower resistance increasing compensation rate or angle in a variable-pitch controller of the wind generating set according to the running state of the unit, and adjusting the blade pitch angle by a variable-pitch system of the wind generating set according to a variable-pitch instruction sent by the variable-pitch controller, so that thrust on thetower is changed, effective damping of the tower is increased, then the purposes of vibration reduction and fatigue reduction of the tower are achieved, the limitation and defect that the existing tower resistance increasing strategy only plays a role in rated and above working conditions are overcome, tower vibration is further reduced, tower fatigue loads are reduced, the unit safety is improved, and the whole machine cost is reduced.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a load reduction method for a tower of a wind power generating set based on control strategy optimization. Background technique [0002] With the development of wind power generation technology and market demand, large-scale stand-alone capacity is the development trend of global wind power technology. Large unit towers account for a large proportion of the cost of wind turbines. The main cost of tower manufacturing is material costs. How to better control the tower to reduce the vibration of the tower is to further reduce the amount of tower material manufacturing. , The key to increasing the life of the unit. The wind turbine is a rigid-flexible coupled multi-body system, and the main elastic vibration bodies are blades and towers. If the tower of the wind power generating set vibrates, the greatest harm is to cause fatigue of the tower members, which means that...

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Problems solved by technology

[0008] However, the existing tower resistance control strategy is only effective when the pitch is active under the rated and above working conditions, and the tower resistance strategy does not work under the rated working conditions, but it is not suitable for wind resources. In particularly rich areas, the wind speed in most wind areas is at a low wind speed for most of the year. In this case, the time for the existing tower resistance strategy to work is relatively limited, so it is very important for lowering the tower. The effect of fatigue loading is very small

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