考虑机组疲劳载荷的风电场快速有功功率分配方法

Fast Active Power Distribution Method for Wind Farms Considering Fatigue Loads of Wind Turbines

为抑制风电场参与系统调频过程中风电机组的疲劳载荷,提出一种风电机组与风电场相协同的快速有功功率分配方法。首先,推导了风电机组轴系和塔架2个自由度的疲劳载荷表达式,建立起风电机组疲劳载荷与有功出力变化之间的关系。其次,以风电场总疲劳载荷及其站内分布最小为优化目标,以站内机组调整功率之和与场站调频功率需求一致为约束,在保证风电场调频性能的同时降低风电机组的疲劳载荷。此外,采用风电机组控制器滚动计算自身的疲劳敏感度系数,采用风电场控制器调用商业求解器在线求解优化策略,确保调频过程中有功控制的实时性。最后,搭建了含20台5 MW双馈风电机组的算例系统,验证分析了所提策略的有效性。

To suppress the fatigue loads of wind turbines caused by wind farms participating in the frequency regulation process,this paper proposes a fast active power distribution method based on the cooperation of wind turbines and the wind farm.Firstly,the fatigue load expression formulas in two degrees of freedom corresponding to the shaft and the tower of the wind turbine are deduced,and the relationship between the fatigue load and the active power output change of the wind turbine is established.Secondly,by taking the minimization of the total fatigue loads and their distribution in the wind farm as the optimization objectives,and considering the constraint that the sum of the adjusted active power of each wind turbine is the same as the required active power for frequency regulation of the wind farm,the fatigue loads of the wind farm can be reduced while guaranteeing similar characteristics of frequency regulation.Moreover,by continuously calculating its own fatigue sensitivity coefficients at each wind turbine controller,the wind farm controller solves the optimal strategies online by using the commercial solver,to guarantee the real-time active power control during frequency regulation.Finally,a case system consisting of 20 doubly-fed induction generator based wind turbines with 5 MW capacity is performed,and the effectiveness of the proposed method is analyzed and verified.