A Boundary-based Method for Robust Economic Dispatch with Uncertain Wind Power in Microgrids

摘要

Wind power generation usually accounts for a large proportion in microgrids, but its inherent intermittency and randomness bring great challenges to the dispatch solution in microgrids. To address the impact of the wind power generation uncertainty on the operation of microgrids, a robust economic dispatch model based on the error boundary of wind power is established in the paper, with the consideration of the potential risk of the scheduling solution. By evaluating the underlying risk of wind curtailment and load shedding, a method for optimizing the error boundary of wind power is proposed with the aim of minimizing comprehensive cost. A practical isolated microgrid system in South China is simulated to demonstrate the effectiveness and adaptability of the proposed robust dispatch model. Further, three perspectives including wind power forecast accuracy, accumulator capacity and load shedding price are also analyzed. The results show that the proposed robust dispatch method can effectively reduce wind curtailment and load shedding, despite slightly increasing the generation cost. Further, robust dispatch method is more suitable for cases with low wind power forecast accuracy, deficient battery storage capacity and high price of load shedding.