Research On Optimal Wind Farm Active Power Dispatch Considering Fatigue Load

Driven by the global renewable energy revolution,wind energy has been vigorously developed and applied in China.It's installed capacity grows fast.However,there are some problems such as over-reliance on subsidies and blind pursuit for more installed capacity.With the gradual withdrawal of the wind power subsidy,China's wind power development is about to enter the parity era.By then,wind energy will inevitably be threaten by traditional thermal power and other renewable energy.Therefore,it is imperative to improve the cost competitiveness of wind energy.For built wind farms,the active power dispatch strategy can directly affect the power production and the fatigue loads of wind turbines.The power production means the income of a wind farm and the fatigue loads is related to the maintenance cost.Hence,operators can improve the economic efficiency and reliability of wind farms through a reasonable active power dispatch strategy.In this way,wind industry can develop healthily and sustainably.Under the support of the National Natural Science Foundation of China(51707029),this paper proposes three optimal wind farm active power dispatch startegies to address the above issues.1)Optimal active power dispatch that aims at maximizing the power production of wind farms.In a large-scale wind farm,the number of wind tubines is large,which means the wake losses are big.To solve the problem,the strategy is proposed to improve the power production of wind farms by adjusting the pitch angle of each wind turbines.2)Optimal active power dispatch for wind farms while considering the fatigue distribution.The traditional wind farm active power dispatch strategy and the imbalanced wind resources may cause wind farm fatigue distribution uneven,which will reduce the economic efficiency and reliability of wind farms.This strategy is proposed to maximize the power production while balancing the fatigue distribution of wind farms.3)Optimal active power dispatch for wind farms that aims at minimising the LPC(levelised production cost).This strategy is proposed to increase the life and power production of wind farms simultaneously.Simulations are conducted based on a 5*5 square wind farm and an irregular shaped wind farm with 80 wind turbines.The results prove the superiority of those strategies.The three strategies are realized by setting a reference active power of each turbines and all the strategies are solved by the particle swarm optimization algorithm.