Load demand Sharing using multiple distributed generation units for the operation of microgrids to realize satisfied power sharing

The important task for the operation of autonomous micro grids, is to share the load demand using multiple distributed generation units. In this paper to realize satisfied power sharing without the communication between DG units, the voltage droop control and its different variations have been proposed. Generally, in a lowvoltage micro grids, due to the effects of feeder impedance, the droop control is subject to the real and reactive power coupling and steady-state reactive power sharing errors. The complex micro grid configurations often make the reactive power sharing more challenging. To improve the reactive power sharing accuracy an enhanced control strategy that estimates the reactive power control error through injecting small real power disturbances, which is activated by the low-bandwidth synchronization signals from the central controller The proposed compensation method achieves accurate reactive power sharing at the steady state. Simulation and experimental results validate the feasibility of the proposed method.