A Contract-Based, Decentralized and Privacy-Preserving Computation Scheme of Evaluation Indices of Shared Energy Storage Market for Renewable Energy Accommodation

With the promotion of shared energy storage (SES) business model, the evaluation indices of SES market can help the market entities understand the market states to adjust their market strategies in time. Considering that some basic data will be owned by the market entities, the computation of evaluation indices may require shared data from multiple parties. However, for the sake of privacy, the market entities may be reluctant to share their data. To address the above issues, a novel computation scheme of evaluation indices of SES market in the renewable energy accommodation scenario is proposed based on smart contracts with the key advantages of decentralization and data privacy protection. Firstly, a power blockchain-based information disclosure framework of SES market is presented to confirm the data ownership of the market entities. Moreover, a decentralized computation scheme combined with smart contracts and fully homomorphic encryption is proposed to compute the evaluation indices of SES market without exposing the original values of the shared data, preserving the privacy of data sharers, i.e., the market entities of SES market. Finally, case studies on the actual data from an SES trading pilot project in Qinghai, China, are performed to verify the effectiveness and performance of the proposed scheme based on a Hyperledger Fabric-based simulation system of power blockchain. The results show that the evaluation indices of SES market can be accurately computed on the power blockchain without privacy exposure risks.