This paper addresses the hierarchical operation and control for a microgrid. In particular, the authors focus on supply and demand control of the microgrid. The microgrid has been actively introduced to distribution networks with renewables such as solar photovoltaic (PV for short) systems and wind energy conversion systems (WECS for short) -. Operation and control methods of the microgrid are complex because renewables have uncertain factors affected by weather. For this reason, effectual operation and control methods have not been proposed yet. In this paper, the authors have evaluated the proposed operation and control methods by the numerical simulation and a real time simulator. The simulation outcome shows the cost minimum operation and frequency stability by the proposed hierarchical operation and control.