Abstract: To achieve the targets of carbon peak and carbon neutrality with the increasing utilization of renewables, regional coordinated transaction scheduling has emerged as a promising approach that can deliver complementary economic advantages across regions while promoting renewable energy consumption. However, market clearing of reserve ancillary services sharing between different regions remains a challenging problem. This paper proposes a method for building the tie-line feasible region with joint consideration of power energy and reserve ancillary services, and develops a market clearing model for regional coordinated transaction scheduling with reserve ancillary services sharing. The proposed model explicitly incorporates reserve ancillary services sharing constraints and sculpts the energy-reserve transaction feasible region. Based on the feasible regions, the market clearing method provides for synchronous energy-reserve transactions through tie-line transmission. A case study of an interconnected network demonstrates that the proposed method can achieve reserve ancillary services sharing across different regions, promote renewable energy accommodation, and reduce total operating costs.

Key words: tie-line feasible region, renewable energy accommodation, reserve ancillary services, interconnected power system, power resource scheduling