An enhanced load power sharing strategy for low-voltage microgrids based on inverse-droop control method

It is important for an autonomous microgrid to share the load demand properly among multiple distributed generation (DG) units. Normally, the traditional ω-P and E-Q droop control method is used for its “plug and play” feature. However, when employed in a low-voltage microgrid, the conventional droop control is subject to the power coupling and steady-state reactive power sharing errors. Furthermore, the complex microgrid configurations often make the reactive power sharing more challenging. In this paper, an enhanced power sharing strategy is proposed based on inverse-droop control, which can behave well in low-voltage microgrids but has real power sharing errors. So a synchronous regulation process for real power sharing is added to inverse-droop control. After the regulation starts, an integration term is added to keep the well shared reactive power, and the real power errors are eliminated through the frequency regulation, just like the work of traditional droop control. Finally, the Matlab simulation results validate the feasibility of the proposed strategy.