Wind power has strong uncertainty

and its large-scale access greatly weakens the ability of power system to resist frequency fluctuations. In order to ensure the frequency security of high proportion wind power system

we propose improvement measures from the perspective of power system unit commitment. Firstly

the multi-agent dynamic frequency response model of power system is established

and the whole dynamic frequency response model of power system is constructed based on this model; meanwhile

the whole system equivalent governor method is used to simplify the model. On this basis

the calculation methods of maximum frequency change rate

steady-state frequency difference and maximum frequency difference are proposed. Then

the minimum operation cost is taken as the optimization objective

a high proportion wind power system unit commitment model considering dynamic frequency response is constructed

and a double-layer optimization method is proposed to solve the model. Finally

an example based on the improved IEEE 39 bus system is analyzed. The results show that the proposed unit commitment model can be adopted to effectively improve the frequency security level of the system while improving the system operation economy.