A Secure Distributed Transactive Energy Management Scheme for Multiple Interconnected Microgrids Considering Misbehaviors

This paper develops a secure distributed transactive energy management (S-DTEM) scheme for multiple interconnected microgrids (MGs). Within the scheme, each MG is managed by a distributed MG energy management system (MG-EMS) which only exchanges information of trading quantities and prices with other MGs to preserve information-privacy. When each MG behaves as a price taker, its S-DTEM dynamically optimizes its energy selling price and operating schedule to minimize its local cost via energy trading with other MGs/main grid. In the meantime, this algorithm can cooperatively minimize the aggregate cost of the interconnected MGs. Finite-time convergence of the S-DTEM can be analytically guaranteed by relaxing the hard operational constraints with quadratic barrier functions. In case that a malicious MG-EMS may misbehave to prohibit the operational schedule from converging to the optimal solution, a misbehavior-detection mechanism is further introduced utilizing the finite-time convergence property. Once the existence of data manipulation is confirmed, a distributed misbehavior-localization algorithm can then identify the most likely misbehaving MG-EMS based on the confidence evaluation of the neighboring MG-EMSs. Simulation results of a 4-MG system demonstrate the effectiveness of the proposed S-DTEM scheme.