Hierarchical control approach for microgrid load sharing with renewable energy sources

The aim of this paper is to develop a control algorithm for load sharing in an isolated microgrid with renewable energy sources (RESs) and storage devices. In this paper, a load sharing control scheme is proposed where a central power management unit and local controllers work together to share the load of a microgrid with its available generators. The central control unit is able to estimate the load deviations for each node centrally by using only the node voltages. This control scheme considers both resistive and inductive transmission lines and works well in a microgrid environment with RESs. Simulation results show that its load-sharing errors are negligible and all the node voltages are within the permissible limits.