Flexibility regulation service is of great significance to the stable operation of renewable energy grid with high permeability. Flexible modification is needed for the existing flexible supply equipment. Its modification strategy determines not only the initial cost of flexible adjustment service but also

to a certain extent

its competitiveness in the flexibility auxiliary service market. A flexibility adjustment service optimization model based on the cost of flexibility equipment transformation is proposed. Firstly

the concept of flexibility and flexibility accommodation service is introduced. Then

the strategy of flexible modification for thermal power units

energy storage equipment and other equipment providing flexibility regulation services is given. Finally

based on this transformation strategy

the cost of providing flexibility is calculated and

on the basis of cournot competition model

a two-layer power market clearing optimization equilibrium model is constructed. The model is simulated and analyzed with typical data

and the results verify the effectiveness and correctness of the proposed strategy.