Power Flow Calculation and Optimization Control of Microgrid with High Penetration of Grid-Forming Distributed Generators

With the increase of the penetration of distributed generator (DG) in microgrid (MG), traditional power flow calculation and optimization methods are no longer applicable. Based on the mathematical model of droop control, the traditional Newton Raphson method is modified. Then the droop control is improved to relax the constraints of DG reactive power and voltage by virtual impedance and theimproved particle swarm optimization algorithm is applied to obtain the MG optimization power flow with the minimum network loss. Finally, the method is verified by simulation and experiment. This paper is helpful to guide the planning and control of terminal power grids or MG with high penetration of grid-forming DG.