Distributed Load Shedding for Microgrid with Compensation Support via Wireless Network

Due to the limited generation, finite inertia, and distributed structure, microgrid suffers from large frequency and voltage deviation which can lead to system collapse. Thus, reliable load shedding method to keep frequency stable is required. Wireless network, benefiting from high flexibility and low deployment cost, is considered as the promising technology for microgrid management. In this paper, for maintaining the supply-demand balance and reducing the load-shedding amount, a distributed load shedding solution via wireless network is proposed. Firstly, the active power coordination of different priority loads is formulated as an optimization problem. To solve it, a distributed load shedding algorithm based on subgradient method (DLSS) is developed to shed the loads gradually. Using this method, the generator compensation can be utilized and has more time to lower the power deficit so as to reduce the load-shedding amount. Secondly, to increase the response rate and enhance the reliability of our method, a multicast metropolis schedule based on time-division multiple access (TDMA) is developed. In this protocol, the time slots are dedicatedly allocated and a checking and retransmission mechanism is utilized. Finally, the proposed solution is evaluated by NS3-Matlab co-simulator. The numerical results demonstrate the feasibility and effectiveness of our solution.