Design Of Eenergy Trading Mechanism And Interaction Strategy For Residential Microgrid

With the maturity of renewable energy technology,residential microgrids,which are characterized by the increased penetrating level of distributed energy resources(DERs)in user sides,have been developed rapidly over recent years.With the deepening reform of electricity market,peer-to-peer(P2P)energy trading provides an effective method to realize the optimization of energy structure,utilize the advantages of DERs and improve system efficiency.However,due to the different features with traditional wholesale market,such as a large attendance,high trading frequency and low volume of each transaction,P2P energy trading in residential microgrids poses a challenge of the applicability of traditional centralized energy trading mechanism.Accordingly,it is an important research topic in current reform of electricity market and the operation field of microgrid to design an effective and reliable energy trading mechanism for residential microgrids.Such a trading mechanism should realize the goals of improving the consumption of DERs,increasing the social welfare and restraining the market risk.This paper explores the P2P energy trading mode based on an energy trading system at user sides of residential microgrids.With the consideration of user preferences,energy management and interaction strategy,a design of energy trading mechanism for residential microgrids based on the spot markets and ancillary services markets have been proposed.The main contributions of this paper are as follows:(1)Based on the simultaneous game-theoretic approach,this paper proposes an interaction strategy for user sides.Through the analysis of game-theoretic approach,it firstly demonstrates the feasibility of this approach as a user-side interaction strategy.Then,combining the analysis of gaming risks,it adopts a risk strategy to restrain the risk.And it also demonstrates the whole interaction strategy,that is a risk-implemented simultaneous game-theoretic approach.(2)This paper design a two-stage energy trading mechanism based on an hour-ahead market.The first stage is aiming to improve the local energy usage among users.With the analysis of the supply-demand relationship and a customize designed two-step price predictor,each user could purposefully adjust the quantities of energy which they are willing to trade.At the second stage,based on the proposed interaction strategy,which could give all market participants fair right to decide their trading prices and then help them to obtain the optimal social welfare,the trading pairs and the corresponding settlement prices could be determined.(3)Based on an hour-ahead and real-time market incorporated P2P market framework,this paper designs a trading mechanism with ancillary services for residential microgrids.In the hour-ahead market,with the forecasting on demands and supplies of the whole market,users could not only trade energy with other users,but also decide whether to provide ancillary services in the real-time market.And users could solve the discrepancy between the predicted value and the actual situation by an auction-based pricing strategy in real-time market.The effectiveness of all the proposed energy trading mechanism and interaction strategies for residential microgrids have been evaluated through analysis of related cases.