Power supply system

A power supply system comprising a plurality of local systems that each include an AC line to which a plurality of power consumers are connected, a power storage device, and a local inverter device that connects the power storage device and the AC line, comprising

• a linking inverter device that connects the power storage device of one local system and the AC line of another local system between the local systems such that the plurality of local systems are electrically connected in series, the power supply system further comprising
• a charging inverter device that connects the power storage device of one local system among the plurality of local systems and an external power system that is separate from the plurality of local systems, and can be used in charging of the power storage device with supplementary power received from the external power system;
• and
• a control device that controls operation of the local inverter devices, the linking inverter device, and the charging inverter device,
• wherein the control device controls the local inverter device of each of the plurality of local systems such that a voltage of power on the AC line is at a target voltage and such that a frequency of power on the AC line is at a target frequency determined according to a state of charge of the power storage device, and
• wherein the power supply system is configured such that when the control device determines that a condition for starting charging has been satisfied, the control device causes the charging inverter device to operate in a charging operation mode in which the supplementary power is received from the external power system and used to charge the power storage device.

A power supply system comprising a plurality of local systems that each include an AC line to which a plurality of power consumers are connected, a power storage device, and a local inverter device that connects the power storage device and the AC line, comprising

• a linking inverter device that connects the power storage device of one local system and the AC line of another local system between the local systems such that the plurality of local systems are electrically connected in series, the power supply system further comprising
• a power conversion device that connects the AC line of one local system among the plurality of local systems and an external power system that is separate from the plurality of local systems;
• and
• a control device capable of controlling operation of the local inverter devices, the linking inverter device, and the power conversion device,
• wherein the control device controls the local inverter device of each of the plurality of local systems such that a voltage of power on the AC line is at a target voltage and such that a frequency of power on the AC line is at a target frequency determined according to a state of charge of the power storage device, and
• wherein the power supply system is configured such that when the control device determines that a condition for starting supplementation has been satisfied, the condition for starting supplementation being for starting supply of supplementary power received from the external power system to the AC line of the one local system, the control device causes the power conversion device to operate in a supplementation operation mode in which supplementary power is received from the external power system, the frequency of the supplementary power is adjusted to the target frequency, and the adjusted supplementary power is supplied to the AC line.