System interconnection electric power generator and control method therefor
First Claim
1. A method of controlling a system interconnection electric power generator comprising an electric power generator for generating DC power, a boosting circuit for boosting the DC power generated in the electric power generator, and an inverter circuit for converting the DC power boosted in the boosting circuit to AC power, the AC power thus boosted being supplied to a commercial power supply system, characterized in that data representing an operational status of the system interconnection electric power generator under operation are stored in a storage device.
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Accused Products
Abstract
In a solar energy generator including a solar battery a microcomputer for controlling at least a boosting circuit and an inverter circuit so that AC power suitably usable as the AC power of a commercial power supply system can be supplied to the commercial power supply system, the power to be supplied to the various kinds of equipment of the solar energy generator is selectively supplied from one of the solar battery and the commercial power supply system. The microcomputer stores the operational status data of the solar energy generator into an external storage device, and these data can be used for maintenance or trouble shooting of the solar energy generator.
185 Citations
19 Claims
- 1. A method of controlling a system interconnection electric power generator comprising an electric power generator for generating DC power, a boosting circuit for boosting the DC power generated in the electric power generator, and an inverter circuit for converting the DC power boosted in the boosting circuit to AC power, the AC power thus boosted being supplied to a commercial power supply system, characterized in that data representing an operational status of the system interconnection electric power generator under operation are stored in a storage device.
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6. A system interconnection electric power generator having various kinds of equipment for generating electric power and supplying the electric power to a commercial power supply system electrically-connected thereto, comprising
an electric power generator for generating DC power; -
a boosting circuit for boosting the DC power generated in said electric power generator;
an inverter circuit for converting the DC power boosted in said boosting circuit to AC power;
a controller for controlling at least said boosting circuit and said inverter circuit;
plural DC lines connected between said electric power generator and said boosting circuit so that direct current achieved in said electric power generator flows through said plural DC lines; and
a DC earth fault detector for measuring the difference in current between said plural DC lines extending from said electric power generator to detect whether DC earth fault occurs or not in said system interconnection electric power generator, wherein said DC earth fault detector comprises a current sensor disposed on said plural DC lines, and said current sensor has a detecting core formed of a zero current transformer (ZCT).- View Dependent Claims (7, 8, 9)
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10. A system interconnection electric power generator having an electric power generator (11) for generating DC power, a boosting circuit (14) for boosting the DC power supplied from the electric power generator (11) to a predetermined voltage larger than the system voltage of a commercial power line, said boosting circuit (14) being equipped with a capacitor (26) for charging DC power, an inverter circuit (15) for converting the boosted DC power to AC power and supplying the AC power thus converted through said commercial power line to a commercial power supply system (13), and a microcomputer (17) for controlling the boosting circuit (14) and the inverter circuit (15), characterized by further comprising:
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a switched power source that is connected between said boosting circuit (14) and said microcomputer (17) and directly supplied with the DC power charged in said capacitor (26) from said boosting circuit (14) so as to supply regulated DC power to said microcomputer (17) irrespective of variation of the DC power generated by said electric power generator (11), wherein said inverter circuit has at least four arms each having a switching element and a fly-wheel diode, and said capacitor (26) charges the DC power generated by said electric power generator (11) and then boosted by said boosting circuit (14) or DC power achieved by passing AC power from the commercial power line through said flywheel diodes (30) of said inverter circuit (15) to rectify the AC power. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
a storage device that is controlled by said microcomputer so as to store operation status data of said system interconnection electric power generator under operation.
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16. The system interconnection electric power generator as claimed in claim 15, wherein the operational status data are data on a protecting operation of protecting said system interconnection electric power generator or the commercial power supply system.
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17. The system interconnection electric power generator as claimed in claim 15, wherein said controller controls said storage device to store the operational status data of said system interconnection electric power generator under operation while keeping the power to be supplied to said controller just before the operation of said system interconnection electric power generator is finished.
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18. The system interconnection electric power generator as claimed in claim 15, wherein said electric power generator comprises a solar battery for generating the electric power corresponding to the amount of sunlight received.
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19. The system interconnection electric generator as claimed in claim 14, wherein said microcomputer makes a judgment as to sunset, and stops the power supply to said commercial power line when the judgment on sunset is confirmed.
Specification