To scientifically and reasonablely distribute wind farm frequency regulation power and reduce load reduction frequency regulation abandoned wind volume

wind turbines(WTs) are divided into three types: no frequency modulation(FM)

down-power FM

and up-power FM

according to the operating status of WTs. On this basis

combining with the system modulation power(down power or up power) requirements

the corresponding WTs frequency regulation is selected to avoid all WTs participating in frequency regulation at the same time

thus to reduce the frequency of WTs frequency regulation and prolong the unit life. Secondly

according to the operating status and limit of WTs

the load shedding constraint model of WTs is constructed to define its frequency regulation capability

so as to realize the dual purpose of optimal allocation of WTs frequency regulation power and optimal utilization of wind curtailment capacity

which can effectively solve the problems caused by average allocation

make WTs quit frequency regulation orderly by defining the risk index of WTs quitting frequency regulation

and avoid the system frequency drop twice problem. The simulation results show that

considering the difference of WTs frequency regulation capability under different operating states to optimize the allocation of frequency regulation power can improve the frequency regulation capability and utilization rate of wind abandoning.