Electric power conversion apparatus, power storage system and power storage method

摘要

A power storage system includes an electric power conversion apparatus, an electric power generation source, and a power storage unit. The power storage unit is configured to have a stored power voltage equal to or higher than a first control voltage to be given to a control unit, the first control voltage being necessary for electric power conversion operation by a DC-DC converter in the electric power conversion apparatus. The control unit in the electric power conversion apparatus is configured to start operating and control an operation of a first switch, when a generated power voltage of the electric power generation source reaches a second control voltage lower than the first control voltage.

主权项

1. An electric power conversion apparatus for charging a power storage unit with a generated electric power received from an electric power generation source, comprising:
a control unit that includes an electric power input unit into which an electric power is input; a DC-DC converter of which an input side is connected to the electric power generation source and of which an output side is connected to the power storage unit, an operation of the DC-DC converter being controlled by the control unit; a rectification unit that is connected between the electric power input unit of the control unit and the input side of the DC-DC converter, allows a flow of electric current from the input side of the DC-DC converter to the electric power input unit of the control unit, and disallows the flow of electric current from the electric power input unit of the control unit to the input side of the DC-DC converter; and a first switch that is connected between the electric power input unit of the control unit and the output side of the DC-DC converter, an operation of the first switch being controlled by the control unit, wherein the power storage unit is configured to have a stored power voltage equal to or higher than a first control voltage to be given to the control unit, the first control voltage being necessary for electric power conversion operation by the DC-DC converter, and wherein the control unit is configured to start operating and control the operation of the first switch, when a generated power voltage of the electric power generation source reaches a second control voltage lower than the first control voltage.