Abstract: In view of the problem that small and medium-sized load resources cannot enter the market to participate in system power balance regulation, load aggregation vendors can integrate small and medium-sized power consumers as peaking load regulation resources. The time-of-use electricity price can optimize the load curve and reduce the load aggregator's compensation cost to regulate peaking load. This paper proposes the source-load interaction rule with which load aggregators participate in peaking load regulation by scheduling load curtailment contracts under time-of-use price incentives. With the aim of minimizing system operating cost, a day-ahead scheduling optimization model is built. The scheduling scheme economy under the three scenarios before and after coordination of the time-of-use price and the load aggregator is compared and analyzed. The simulation results show that the source-load interaction model can effectively reduce the unit's operation cost compared with separate optimization and improve the system's wind power accommodation level and the economic benefits.