An Energy Sharing Mechanism Considering Network Constraints and Market Power Limitation
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As the number of prosumers with distributed energy resources (DERs) grows, the conventional centralized operation scheme may suffer from conflicting interests, privacy concerns, and incentive inadequacies. In this paper, we propose an energy sharing mechanism to address the above challenges. It takes into account network constraints and fairness among prosumers. In the proposed energy sharing market, all prosumers play a generalized Nash game. The market equilibrium is proven to have nice features in a large market or when it is a variational equilibrium. To deal with the possible market failure, inefficiency, or instability in general cases, we introduce a price regulation policy to avoid market power exploitation. The improved energy sharing mechanism with price regulation can guarantee existence and uniqueness of a socially near-optimal market equilibrium. Some advantageous properties are proven, such as individual rationality of prosumers, an elegant structure of sharing prices, and the tendency towards social optimum with an increasing number of prosumers. For implementation, a practical bidding process is developed with convergence condition. Experimental results validate the theoretical outcomes and show the practicability of our model and method.
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