若风电机组参与调频时采用步进惯量控制(stepwise inertial control,SIC)策略,其退出调频时有功快速下降可能会引发系统频率二次跌落(frequency second drop,FSD)问题.已有文献中一类改进的SIC策略通过减小风电机组退出调频后有功下降阶段的斜率来应对FSD问题,然而该类改进的SIC策略使得风电机组在退出调频后其有功需要一段时间才会小于风能捕获,在此期间转子转速会继续下降并有可能低于转速下限,危及风电机组运行安全.文章对这一类改进的SIC策略做了进一步完善,提出了一种风电机组自适应SIC策略,根据风电机组退出调频时的转子转速自适应设置风电机组退出调频后有功下降阶段的斜率,在确保风电机组退出调频后转子转速不会低于转速下限的前提下,最小化FSD的幅度.
Adaptive Stepwise Inertial Control Strategy for Wind Turbines
If wind turbines adopt the stepwise inertial control(SIC)strategy when participating in frequency regulation,their active power will rapidly decrease after they exit frequency regulation,which may cause the problem of frequency secondary drop(FSD).A type of improved SIC strategy proposed by existing research is to reduce the slope of active power decline after wind turbines exit frequency regulation.Under this type of improved SIC strategy,it takes some time for the active power to be less than the wind energy capture after wind turbines exit frequency regulation.During this period,the rotor speed will continue to decrease and may be lower than the lower speed limit,endangering the safety of wind turbine operation.This paper makes further improvements on this type of improved SIC strategy;a wind turbine adaptive SIC strategy is proposed.Based on the rotor speed when the wind turbine exits frequency regulation,the slope of active power decline after the wind turbine exits frequency regulation is adaptively set.While ensuring that the rotor speed does not fall below the lower speed limit after the wind turbine exits frequency regulation,the amplitude of FSD is minimized.
frequency regulationinertia controlfrequency secondary dropsloperotor speedadaptively
万方数据
维普
