Abstract: The objective of this invention is to provide an autonomous distributed electric power system without depending on a known electric power system. In order to achieve such objective, this invention proposes a following feature: Output frequencies of autonomous grid-connection inverters (104, 164) are to be variably controlled by the control system depending on a change of a stored electric power amount [kWh] of the direct current electric power storage device (102) within an alternating-current autonomous-distributed electric power system; and, such electric power system is built of plural electric power supplier and demander (11, 12, 13, 14, 15) who have electric power storage devices with a system which can control such inverters (104, 164); those inverters are voltage self-exciting as well.

Abstract: An electric power system in which a plurality of electric power suppliers and demanders are mutually connected via control devices is self-sustainable but also capable of coexisting with the known electric power system. Suppliers/demanders 11 to 15 are mutually connected via an electric power supply and demand line W and have power generation devices 101 and 151, electrical storage devices 102 and 152, a plurality of loads 103, and electric power supply and demand control devices 104 and 153 that detect an electricity shortage or surplus, receives or delivers electric power from or to other suppliers/demanders 12 to 15 accordingly, and automatically or manually controls the power generation devices including a co-gene in respective suppliers/demanders on the basis of a weather forecast, demand prediction, and the like.

Abstract: The electric power supply and demand control device judges whether or not electric power shortage is occurred or whether or not electric power surplus is occurred in the electric power supplier and demander provided with the electric power supply and demand control device based on data on total electric energy, the amount of maximum electric power demanded, and the amount of total electric power demanded of the following day in each electric power supplier and demander, predicted by a neural network; receives electric power from other electric power suppliers and demanders provided with the power generation devices and/or the electrical storage devices in the case where electric power shortage is occurred in the electric power supplier and demander; and controls to deliver electric power to other electric power suppliers and demanders in the case where electric power surplus is occurred in the electric power supplier and demander.

Abstract: The objective of this invention is to provide an autonomous distributed electric power system without depending on a known electric power system. In order to achieve such objective, this invention proposes a following feature: Output frequencies of autonomous grid-connection inverters (104, 164) are to be variably controlled by the control system depending on a change of a stored electric power amount [kWh] of the direct current electric power storage device (102) within an alternating-current autonomous-distributed electric power system; and, such electric power system is built of plural electric power supplier and demander (11, 12, 13, 14, 15) who have electric power storage devices with a system which can control such inverters (104, 164); those inverters are voltage self-exciting as well.