POWER STORAGE TYPE PHOTOVOLTAIC POWER GENERATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a power storage type photovoltaic power generation system capable of specifying the power generated by a solar cell and the discharge power of a power storage device, and preventing reverse flow of the discharged power of the power storage device charged with the power from a grid.

SOLUTION: A power conditioner of the photovoltaic power generation system in which a solar cell is linked to a grid is provided with: a power converter having both functions of an inverter operation of converting DC power from the solar cell into AC and a converter operation of converting AC power from the grid into DC; a reverse flow relay for detecting that reverse flow is generated in the grid; a single controller for selectively controlling charging/discharging of power for any one of a first power storage device suppressing output variation of the solar cell and a second power storage device charging midnight power; and a changeover switch for interrupting connection between the second power storage device and the controller on the basis of an output of the reverse flow relay when reverse flow of excessive power occurs in the solar cell. In the power conditioner, the controller is connected to a solar cell side of the power converter, and the changeover switch is inserted and connected between the first power storage device, the second power storage device and the power converter.

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