A Microgrid Capacity Optimization Method Considering Carbon Emission Cost

Microgrid is an important form of utilizing distributed renewable energy as well as a key link to realize low carbonization of the power grid. In this paper, a double-layer optimization method considering carbon emission cost is proposed to determine the optimal capacity of a microgrid. Specifically, the outer-layer optimization focuses on solving the optimal capacity of microgrid and the inner-layer optimization focuses on optimizing the allocation of different power generation units considering carbon emission cost. Besides, the formulated double-layer optimization model also considers uncertainties in multiple-time scales. In the outer layer, a robust coordination indicator is proposed to deal with energy balance in the long-time scale, while in the inner layer, a forecasting error indicator is proposed to deal with power balance in the short-time scale. Finally, an island microgrid is taken as an example to testify the impact of carbon emission cost on microgrid planning. Simulation results verify the validity of the proposed model and method.