POWER STORAGE DEVICE, POWER STORAGE METHOD, AND POWER GENERATION SYSTEM

To provide a power storage device, a power storage method, and a power generation system that increase a collection rate or a utilization rate of power generated by a power generation unit such as a photovoltaic power generation panel.SOLUTION: A power generation system includes: a power storage unit (6) that connects a series circuit of at least a first power storage device (capacitor 12) and a second power storage device (buttery 14), each having different charge/discharge characteristics, in parallel to a power generation unit (4), and stores power generated by the power generation unit; a first DC-DC converter (16) that controls a storage voltage of the power storage unit to a target value by using any one of the generated current, generated voltage, and generated power of the power generation unit; and a second DC-DC converter (18) that controls the current obtained in the second power storage device of the power storage unit, which is charged or discharged according to the generated power, to the target value.SELECTED DRAWING: Figure 1 【課題】太陽光発電パネルなどの発電ユニットで得られる発電電力の回収率ないし利用率を高める。【解決手段】少なくとも充放電特性が異なる第一の蓄電デバイス（キャパシタ１２）および第二の蓄電デバイス（バッテリ１４）の直列回路を発電ユニット（４）と並列に接続し、発電ユニットの発電電力を蓄電する蓄電部（６）と、発電ユニットの発電電流、発電電圧または発電電力の何れかを用いて前記蓄電部の蓄電電圧を目標値に制御する第一のＤＣ－ＤＣコンバータ（１６）と、発電電力に応じて充電しまたは放電する蓄電部の前記第二の蓄電デバイスに得られる電流を目標値に制御する第二のＤＣ－ＤＣコンバータ（１８）とを備える。【選択図】 図１