Coordinated Energy Sharing and Management for Communities with Distributed Renewable Sources and Energy Storages

基於分布式能源和蓄能系統的社區能量共享與協同控製

Student thesis: Doctoral Thesis

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Award date29 Aug 2023

Abstract

Electric power systems are undergoing significant changes, driven by the rapid development of distributed energy resources and advanced digitalization technologies. The electrification of consumption with energy from renewable sources is crucial for accelerating the energy transition and decarbonization. Owing to the intermittent nature of renewable energy, the supply and demand matching is an inevitable challenge faced by conventional power systems. Interactive energy sharing and communication among building prosumers are promising solutions to facilitate local energy balance and bring economic benefits. However, prosumer-based energy sharing and management (PESM) and the techno-economic effects on different stakeholders need further investigation with respect to the following aspects.

First, the evaluation of energy sharing communities based on the simple sum of demands, generation and storage capacities leads to the overestimation on techno-economic performance and the ignorance on individual interests. More attention should be paid to the fairness of overall cost distribution when implementing cooperative energy sharing strategies. Second, few studies emphasized the performance under demand-side controls with different data communication methods during the energy transaction to provide efficiency and privacy protection. Moreover, flexible demands are adjusted based on the simplified assumption that each prosumer has a proportion of controllable loads without considering different buildings’ characteristics and multi-energy system constraints. Third, buildings and electric vehicles (EVs) in commercial neighborhoods are often different players, but most previous studies managed the aggregated EVs for ancillary services and neglected the revenues of EV users in the PESM. Furthermore, for the centralized coordination, computation and communication loads will significantly increase with the growth in community scales.

In this study, coordinated energy sharing and management methods are proposed for prosumers with DERs involving hybrid wind-solar systems, energy storages, and EV fleets, by combining peer-to-peer (P2P) energy sharing, multi-energy management, and distributed storage coordination. With respect to different forms of energy interactions and coalitions in a commercial neighborhood, the effects of the formulated coordination strategies on the entire system and different participants are analyzed, in terms of grid interaction, load matching, individual energy costs and battery degradation costs. Besides, a sensitivity analysis is conducted to study the influence of different design and market parameters on overall and individual performance. An internal energy trading mechanism based on the supply and demand ratio (SDR) is designed to obtain a win-win solution, while the fairness of cost distribution is evaluated by the Shapley value in cooperative games. Furthermore, a multiagent-based simulation framework is developed for an iterative bidding and pricing procedure in the PESM system, to integrate distributed control and privacy preservation. The feasibility of the distributed coordination approach is evaluated under different scenarios, by implementing suitable convergence techniques.

Simulation results show that sharing renewable and storage systems brings more techno-economic benefits than sharing renewable energy only, despite slightly higher environmental emissions due to battery charging/discharging losses. Meanwhile, cooperative participation in the P2P energy system contributes to the cost reduction of each prosumer when implementing suitable internal prices. By coordinating multi-energy demands and storage systems with predictive information, the P2P system could use electricity more effectively and economically. The cost for each participant can be allocated by regulating the compensating price in the internal pricing mechanism. Additionally, compared to the independent operation of EV fleets and stationary batteries, the integrated prosumer-vehicle energy sharing system maximizes individual economic performance through optimal scheduling and prolongs the service life of prosumer-owned batteries. Moreover, autonomous prosumers can make their own decisions and coordinate with each other by sharing limited information in the multiagent simulation framework. Compared with the fully centralized control of electric storage systems, a cost-optimal solution can also be achieved at the system level by distributed coordination. The coordination based on multiagent simulation has better scalability and improved technical effects, which provides a promising energy management approach in practice.

The study develops prosumer-based energy sharing and management systems with high renewable penetration and interactive vehicle electrification, to provide synergistic operation and technical guidance for sustainable energy communities, together with economic incentive policies.

    Research areas

  • Distributed renewable sources, Coordinated energy management, Energy storage system, Peer-to-peer energy trading, Energy flexibility