The invention provides a distributed power grid system, comprising a first-grade node, a second-grade power network, a first secondary-grade node, a first user, a second secondary-grade node, a second user, a third secondary-grade node and a third user, wherein a power device of the user performs the power energy exchange through the respective second-grade node and the second-grade power network; the first-grade node can coordinate power energy exchange between the different second-grade nodes through the secondary-grade power network.