PHOTOVOLTAIC POWER GENERATION SYSTEM

• Main Author: KIDOGUCHI HIDETAKA
• Format: Patent
• Language: English
• Published: 03.02.1998
• Edition: 6
• Subjects: 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; CONTROLLING; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES; SYSTEMS FOR STORING ELECTRIC ENERGY

PROBLEM TO BE SOLVED: To charge a storage battery by a solar battery at the same time even in parallel operation with an external power source and take maximum electric power out of the solar battery as to the photovollaic power generation system. SOLUTION: When a solar battery feed system consisting of the solar battery 1 and an inverter 2 and the external power source 10 are in parallel operation, charging control over the storage battery 3 is performed by a bidirectional DC/DC converter 9 installed in the charging/discharging path of the storage battery 3 to limit a decrease in the impedance of a solar battery load circuit at this charging time to less than a specific value and in this state, a maximum power follow-up control circuit 12 which makes the input voltage of the inverter 2 follows up a set voltage corrected according to circumferential conditions such as sunshine conditions is made to function to perform maximum power follow-up control over the solar battery 1 under solar battery load impedance control by the output control of the inverter 2 having its input voltage corrected by this circuit, thereby taking optimum electric power corresponding to the changing sunshine state out of the solar battery 1 and charging the storage battery 3 at the same time.