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US 6,856,497 B2Granted
System interconnection apparatus and connection method thereof
AssigneeCanon Kabushiki Kaisha
InventorsMasaki Suzui, Naoki Manabe, Nobuyoshi Takehara
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AssigneeCanon Kabushiki Kaisha
InventorsMasaki Suzui, Naoki Manabe, Nobuyoshi Takehara
Estimating the term…
Along with the expansion of the application range of solar power generation systems, connection to a single-phase 100-V system is required. To most easily meet this requirement, a non-insulated inverter with a single-phase two-wire 100-V output is used. It is preferable to use an inverter with a single-phase two-wire 200-V output, i.e., a most popular commercially available inverter. For this purpose, a power supplied from a solar battery is converted into a single-phase three-wire 200-V AC power form by the inverter. The output from the inverter with non-insulated inputs and outputs is supplied to a system through a transformer arranged to connect the line of the single-phase three-wire 200-V AC power to a single-phase two-wire 100-V system with one line grounded. To make a ground fault sensor incorporated in the inverter function, the median potential line of the single-phase three-wire 200-V AC power is connected to the ground line of the system.
A system interconnection apparatus for connecting a power generated by a solar battery to a power system, comprising:
A system interconnection apparatus for connecting a power generated by a solar battery to a power system, comprising:
A connection method of a system interconnection apparatus having a non-insulated inverter arranged to convert a power supplied from a direct current power supply into a single-phase two-wire alternating current power form, a sensor installed in the inverter, arranged to detect a ground fault, a switch arranged to connect/disconnect a line of the single-phase two-wire alternating current power to/from a single-phase two-wire power system with one line grounded, and an alarm arranged to detect an abnormal connection between the power system and the line of the single-phase two-wire AC power and generate an alarm, comprising the steps of:
Dependencies are inferred from the claim text.