COMPOSITE POWER STORAGE SYSTEM

PROBLEM TO BE SOLVED: To provide a system by which DC bus voltage can be stably controlled and an amount of power generation of a solar cell can be maximally utilized even when an amount of charge/discharge exceeds processing capability of a grid interconnection bidirectional AC/DC converter.SOLUTIO...

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Bibliographische Detailangaben
Hauptverfasser:	SUZUKI KENTARO, INAGAKI KATSUHISA, ENDO TAMOTSU
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION SYSTEMS FOR STORING ELECTRIC ENERGY
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a system by which DC bus voltage can be stably controlled and an amount of power generation of a solar cell can be maximally utilized even when an amount of charge/discharge exceeds processing capability of a grid interconnection bidirectional AC/DC converter.SOLUTION: A composite power storage system according to the embodiment includes: a bidirectional power converter 1 provided between an AC power supply system 3 and a DC bus 42 and operating so as to set a DC bus voltage to a first DC voltage command value; a first DC/DC converter 5 provided between the DC bus 42 and a storage battery 7 and controlling charge/discharge of the storage battery 7 on the basis of the DC voltage command value; and a second DC/DC converter 8 provided between the DC bus 42 and a solar cell 10 and controlling the amount of power generation of the solar cell 10 on the basis of the DC voltage command value, in which the DC voltage command value of the first DC/DC converter 5 connected to the storage battery 7 which performs discharge operation is set to a second voltage command value which is higher than the first voltage command value of the bidirectional power converter 1.