A digital twin of multiple energy hub systems with peer-to-peer energy sharing
Shiyao Li, Yue Zhou, Jianzhong Wu, Yiqun Pan, Zhizhong Huang, Nan Zhou
Abstract
As climate change has become a global concern, the decarbonization of energy systems has become a prominent solution for CO 2 emission reduction. The recent emergence of multi-energy hub systems (MEHs), characterized by interconnected energy hubs (EHs) and facilitated by energy sharing, presents a promising solution for seamlessly integrating a significant share of renewable energy sources (RESs) and flexibility among EHs. Faced with the intricate interplay and uncertainty of future energy markets, an extensive digital twin (EXDT) is proposed to perform predictive testing and evaluate the performance of MESs. This EXDT provides energy system operators with insights into the coordinated behavior of interconnected EHs under various future scenarios, thus contributing to smarter decision-making processes. Specifically, an array of scenarios including different decision-making strategies and P2P energy sharing strategies were considered. For each of these scenarios,"what-if" tests were conducted using a multi-agent reinforcement learning (MARL)-based method to model the stochastic decision-making process of EHs belonging to different stakeholders with access to local information. Uncertainties during operation can be mitigated using Markov Game (MG) by capturing knowledge from historical energy data. Subsequently, the economic and technical performance were evaluated using multidimensional evaluation indexes. The proposed MARL-based EXDT was applied to a representative 4-EH multi-energy system in China. Simulation results indicate that P2P energy sharing facilitates the local consumption of renewable energy, providing additional financial benefits and self-sufficiency to each EH and offering peak shaving to the upstream grid. Additionally, system performance under various decision-making and P2P sharing strategies was tested and evaluated to identify the impact of these strategies on system operation. • Extensive digital twin for multi-energy hub systems with P2P energy sharing. • EXDT enables virtual testing & evaluations of MEHs under various scenarios. • MARL-based model for predicting stochastic decision-making process of EHs. • Economic and technical benefits of P2P sharing: increased renewables and financial gains. • Evaluation of various decision-making and P2P strategies for energy system operations.