Minimizing Risk of Load Shedding and Renewable Energy Curtailment in a Microgrid with Energy Storage

摘要

We consider a microgrid with random load realization, stochastic renewableenergy production, and an energy storage unit. The grid controller provides thetotal net load trajectory that the microgrid should present to the main gridand the microgrid must impose load shedding and renewable energy curtailment ifnecessary to meet that net load trajectory. The microgrid controller seeks tooperate the local energy storage unit to minimize the risk of load shedding,and renewable energy curtailment over a finite time horizon. We formulate theproblem of optimizing the operation of the storage unit as a finite stagedynamic programming problem. We prove that the multi-stage objective functionof the energy storage is strictly convex in the state of charge of the batteryat each stage. The uniqueness of the optimal decision is proven under someadditional assumptions. The optimal strategy is then obtained. Theeffectiveness of the energy storage in decreasing load shedding and REcurtailment is illustrated in simulations.