Load Flow Analysis of Islanded Droop Regulated Microgrids

Load flow studies are necessary for power system planning, analysis, operation, and optimization. A modified algorithm that can solve the load flow for the islanded radial microgrid is proposed in this paper. Droop controlled DGs are used in the microgrid rather than conventional DGs. Instead of using slack buses, one bus is selected as a reference and provides voltage reference and necessary power to the system. Frequency and voltage get updated to compensate for the active and reactive power. The convergence of the proposed load flow is tested and verified. The algorithm is based on the Backward/Forward Sweep method with modifications. Simulations are carried out in the MATLAB software and the proposed method is found to be accurate, simple, and easy to implement. The results with and without DGs for the 33 bus system is analyzed.