Multi‑time Scale Coordinated Optimization of New Energy High Permeability Power System Considering Flexibility Requirements

The high proportion of grid-connected intermittent energy such as wind power and photovoltaic makes the demand for

power system flexibility increase sharply. In order to improve the overall flexibility of new energy high permeability system

and enhance the economy of power system, promote the new energy consumption of system. This paper presents a multi-

time scale Coordinated optimization strategy for the new energy high permeability power system considering flexibility

requirement (MTSCOSFR). This strategy makes full use of the adjustment ability of source-load-storage flexible resources

and analyzes system flexibility requirements at different time scales, creates multi-time scale optimization scheduling models

, including typical week operation simulation model, typical day operation simulation model, typical period operation

simulation model. Puts the profit of carbon trading and the penalty cost of insufficient flexibility into the optimization goal.

Adopts the idea of multi-time coordination and step-by-step optimization to solve the model. This paper sets two cases to

discuss MTSCOSFR. The results show that the comprehensive cost of the typical weekly operation simulation is reduced

to 2360× 104 $, the penalty cost of insufficient flexibility in the typical day operation simulation is reduced by 67%, the

flexibility capacity increased by 500 MW, the regulation capacity increased by 300 MW, the ramp margin increased by

1500 MW/(5 min)−1.  The proposed strategy can improve system flexibility and promote new energy consumption on the