A decentralized multi-energy resources aggregation strategy based on bi-level interactive transactions of virtual energy plant

Under the integrated energy system, user-side resources have strong flexibilities and the number of resources is huge. It is challenging to aggregate user-side decentralized multi-energy resources to participate in integrated energy market transactions. The threshold for the transaction access is an important factor in the low participation rate of decentralized multi-energy resources on the user side for the trading and operation of integrated energy systems. To this end, this paper builds an operating framework of the grading dynamic aggregation platform, and proposes a decentralized multi-energy resources aggregation strategy based on bi-level interactive transactions of virtual energy plant (VEP). First, we put forward the operation model of VEP, and analysis the market influencing factors of VEP in bi-level interactive transactions. Secondly, a decentralized multi-energy resources grading dynamic aggregation model based on VEP is established and applied to the VEP optimal scheduling model. Finally, taking a regional integrated energy system as an example, including electricity, gas and heat systems. The results show that the proposed method can dynamically aggregate decentralized multi-energy resources that do not meet the entry rules to participate in system transactions and operations. Compared with the fixed aggregation method, the decentralized resource utilization rate is increased by 25.87%. Moreover, the proposed model effectively improves the bidding efficiency of the VEP and the economic benefits are increased by 6.52%.