Optimal proportion of grid-connected microgrid capacity in low-carbon economy

Distribution generation (DG) can be realized in utility through the powerful carrier-microgrid. In addition, the smart dispatching of microgrid can further promote the cascading utilization of energy resources, improving the structure of energy resources and enhancing the function of power grid in the development of the low-carbon economy. In this paper, two energy management modes are proposed and illustrated with examples in actual system. The unit investment costs of energy saving and emission reduction are analyzed. Particle swarm optimization algorithm (PSOA) is applied to optimize the management mode, which is relatively better in economy, to further reduce the unit investment cost. With the PSOA method, the unit investment cost is reduced and the system is more economical. Based on the result, an effective energy management mode is suggested, which ensures the optimal proportion of DG capacity within the microgrid.