Impact of Seasonal Net load Variation on Load Shedding Ratio in Islanded Microgrid Operation

Abstract

Due to the absence of grid-tie and limited generation, Islanded microgrids (MGs) may experience a large frequency and voltage deviation which can lead to system collapse. Thus, load shedding is a commonly used technique to achieve a stable operation in remote islanded MGs. Optimal scheduling and effective coordination between local resources are essential to minimize load shedding and achieve a reliable operation. This paper presents an optimization model for optimal scheduling of islanded microgrid local resources to assure supply-demand balance and minimize the load-shedding amount as well as determining the optimal amount of load to be shed. The proposed model is a centralized scheduling model that performs a centralized operation and control. A Mixed Integer Linear Programming (MILP) is used to formulate the proposed optimization model and solved using CPLEX tool. The influence of the seasonal net load variability on the model performance has been considered in this study. Numerical results demonstrated the effectiveness of the proposed operation model.