Hosting Capacity Assessment of Renewable Energy for Island Microgrids

Under the background of energy conservation and emission reduction, distributed generation (DG) systems represented by photovoltaic (PV) have been rapidly developed. Island microgrids, lacking support from the main grid, require controllable distributed energy resources to maintain operational stability. However, the integration of intermittent and fluctuating power sources like PV may lead to voltage violations and power imbalance issues. This study establishes a mixed-integer secondorder cone programming (MISOCP) model for evaluating the PV hosting capacity in islanded microgrids. The model takes the maximum PV acceptance capacity of buses as the objective function and considers constraints including power flow constraints, security constraints, droop control constraints, and distributed power source capacity constraints. Numerical experiments are conducted on a microgrid modified from the IEEE 33-bus distribution network to investigate the impacts of PV connection locations and droop coefficients of controllable distributed energy resources on the maximum hosting capacity and voltage profiles.