Energy management system, independent system, and method for operating independent system

An independent system comprising a power supply system, a natural energy generating apparatus, a storage battery system, a power generator, a first load, a second load, and an energy management system,

• the energy management system including:
• an acquisition part acquiring information indicating states of the natural energy generating apparatus, the storage battery system, the power generator, the first load, and the second load when:
• the natural energy generating apparatus, the storage battery system, the power generator, and the first load are connected to the power supply system;
• the natural energy generating apparatus supplies generated power to the power supply system;
• the storage battery system is a regulated power supply;
• and the power generator performs a constant power operation;
• and
• a control part controlling, based on the information, operations of the natural energy generating apparatus and the power generator, connection of the second load to the power supply system, and paralleling off the second load from the power supply system so that a demand-supply balance of power in the independent system is maintained, with the first load maintained to be connected to the power supply system;
• wherein the second load includes a plurality of loads, and
• the control part holds a plurality of priorities assigned to the plurality of loads, and controls connection of the plurality of loads to the power supply system and paralleling off the plurality of loads from the power supply system so that a load to which a higher priority is assigned is preferentially connected to the power supply system and a load to which a lower priority is assigned is preferentially paralleled off from the power supply system.

A method for operating an independent system including a power supply system, a natural energy generating apparatus, a storage battery system, a power generator, a first load, and a second load, the method comprising the steps of:

• acquiring information indicating states of the natural energy generating apparatus, the storage battery system, the power generator, the first load, and the second load when:
• the natural energy generating apparatus, the storage battery system, the power generator, and the first load are connected to the power supply system;
• the natural energy generating apparatus supplies generated power to the power supply system;
• the storage battery system is a regulated power supply;
• and the power generator performs a constant power operation;
• and
• controlling, based on the information, operations of the natural energy generating apparatus and the power generator, connection of the second load to the power supply system, and paralleling off the second load from the power supply system so that a demand-supply balance of power in the independent system is maintained, with the first load maintained to be connected to the power supply system;
• wherein the second load includes a plurality of loads,
• a plurality of priorities are assigned to the plurality of loads, and
• the connection of the plurality of loads to the power supply system and the paralleling off the plurality of loads from the power supply system is controlled so that a load to which a higher priority is assigned is preferentially connected to the power supply system and a load to which a lower priority is assigned is preferentially paralleled off from the power supply system.