| Wind turbine’s active power control depends on the synergy of torque control,pitch control,and yaw control.The quality of each control directly affects the turbine’s power generating performance and load,and then affects the turbine’s KWH cost.At the same time,the state’s subsidies for wind power have been declining,and the era of "electric power bidding" is about to coming.In this situation,it is particularly important to develope the control of wind turbines to increase power generation and reduce turbine loads.With the objective of increasing power generation and reducing load of wind turbines,the research of control strategy has been carried out.Based on Bladed,an accurate model of a wind turbine with a rated power of 2MW was build.Then a external controller for turbine’s active power control was designed and programmed.This external controller is used for Bladed simulation,together with the analysis of the actual data from a real turbine.I found that yaw error has different effects on the generating performance and load under different wind speeds,and then a yaw control optimization strategy based on wind speed partition is proposed.For the problem of load spikes near the rated operating point,an optimization strategy for pitch control near the rated wind speed point is proposed.A Bladed hardware-in-the-loop simulation platform is set up to simulate the proposed optimal control strategy.The results show that the proposed yaw control optimization strategy based on wind speed partition can reduce the number of yaw actions at low wind speeds,improve unit power generation performance at high and medium wind speeds,and reduce unit loads at rated wind speeds and above.The proposed pitch control optimization strategy has a suppressive effect on the load spikes and has a small impact on the generating performance of the turbine.It can reduce the ultimate load of the turbine which is under severe wind conditions and keep the tubine operating safely. |
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