| 摘要 |
PROBLEM TO BE SOLVED: To perform charge/discharge control economically.SOLUTION: The charge/discharge controller controls exchange of power between a power generator, a battery, a load, and a power system via a power conversion unit. A charge/discharge control unit sets a charging fee (fee required for charging) when utilizing commercial AC power, by adding an extra charge (power conversion loss in terms of charge) to the power charge of each time zone, and also sets the charging fee when utilizing the generated power by using the extra charge. When charging is performed actually, the values of a plurality of charging capacities are held, while dividing the whole charging capacity of the battery into a plurality of charging capacities (CC, CC) corresponding to a plurality of charging fees (CST, CST). Thereafter, when there is a charging capacity (CC) corresponding to a charging fee lower than the current power charge (13 yen/kWh), discharge of the battery is permitted within a limit of that charging capacity. |
