Power control device, power control method, and power supply system
View Patent ↗The control device includes: an acquisition unit which acquires voltage information indicating a voltage applied to a capacitor provided between a power generation unit and a load via first and second power supply lines, and deterioration information indicating a state of deterioration of a storage battery connected to the power generation unit; a determination unit which compares the acquired voltage information with a reference voltage so as to detect a fluctuation of the voltage, and determines power to be outputted so as to suppress the fluctuation; and an informing unit which informs the storage battery of a current value corresponding to the power to be outputted, wherein the determination unit detects the state of deterioration of the storage battery using the deterioration information, and determines power to be outputted in accordance with the state of deterioration.
1. A power control device comprising:
an acquisition unit that acquires voltage information and deterioration information, the voltage information indicating a voltage applied to a capacitor provided between a power generation unit and a load via a first power supply line and a second power supply line, the deterioration information indicating a state of deterioration of a storage battery connected to the power generation unit via the first power supply line and the second power supply line;
a determination unit that compares the voltage information acquired by said acquisition unit with a predetermined reference voltage so as to detect a fluctuation of the voltage applied to the capacitor, and determines power to be outputted by the storage battery, so as to suppress the fluctuation of the voltage applied to the capacitor; and
an informing unit that informs the storage battery of a current value corresponding to the power to be outputted by the storage battery,
wherein said determination unit detects the state of deterioration of the storage battery using the deterioration information acquired by said acquisition unit, and adjusts a charge time or a discharge time of the storage battery in accordance with the state of deterioration of the storage battery.
2. The power control device according to claim 1 ,
wherein said determination unit determines power to be outputted per unit of time in accordance with the state of deterioration of the storage battery.
3. The power control device according to claim 1 ,
wherein the deterioration information is calculated as a value corresponding to at least one of a voltage value and a temperature value of the storage battery.
4. The power control device according to claim 3 ,
wherein said acquisition unit acquires the deterioration information containing the at least one of the voltage value and the temperature value of the storage battery each time the storage battery outputs a current in response to receiving the current value, until a fluctuation of the voltage applied to the capacitor is eliminated, and
said determination unit updates a charge amount of the storage battery and a state of deterioration of the storage battery each time said determination unit acquires the deterioration information.
5. The power control device according to claim 1 ,
wherein the determination unit determines power to be outputted by the storage battery, in such a manner that the charge time or the discharge time is increased as the state of deterioration of the storage battery becomes worse.
6. The power control device according to claim 1 ,
wherein a plurality of storage batteries, each of which is the storage battery, are connected in parallel to the first power supply line and the second power supply line,
said acquisition unit acquires a voltage value from each of the storage batteries,
said determination unit further calculates a value corresponding to State of Charge (SOC) of each storage battery from the acquired voltage value of the storage battery,
said power control device further comprises a power distribution ratio calculation unit that calculates a distribution ratio of power to be outputted by each storage battery, in accordance with a ratio of the value corresponding to the SOC among the storage batteries, and
said informing unit calculates the current value for each of the storage batteries based on the power to be outputted by the storage battery and the distribution ratio calculated by said power distribution ratio calculation unit, and informs storage battery of the calculated current value, the power being determined by said determination unit, and the storage battery corresponding to the calculated current value.
7. The power control device according to claim 6 ,
where said determination unit determines an upper limit of power to be outputted by each of the storage batteries, in accordance with a state of deterioration of a storage battery with a highest temperature among the storage batteries.
8. The power control device according to claim 1 ,
wherein the power generation unit is a power generation system using green energy,
the load includes an AC load,
a DC/DC conversion unit which converts the green energy to DC power is connected between the power generation unit and the capacitor,
a DC/AC conversion unit which converts the DC power outputted from the DC/DC conversion unit to AC power is connected between the capacitor and the load,
said acquisition unit further acquires power values outputted by the DC/DC conversion unit and the DC/AC conversion unit, and
said determination unit determines power to be outputted by the storage battery so as to suppress a difference between the power values outputted by the DC/DC conversion unit and the DC/AC conversion unit.
9. A power supply system comprising:
a power generation unit;
a load to which an electric appliance is connected;
a power storage device that accumulates power generated by said power generation unit, and supplies power to said load; and
a power control device that performs a charge control or a discharge control of said power storage device, said power control device and said power storage device being connected to each other via a network,
wherein said power control device includes:
an acquisition unit that acquires voltage information and deterioration information via the network, the voltage information indicating information of a voltage applied to a capacitor provided between said power generation unit and said load via a first power supply line and a second power supply line, the deterioration information indicating a state of deterioration of a storage battery included in said power storage device and connected to said power generation unit via the first power supply line and the second power supply line;
a determination unit that compares the voltage information acquired by said acquisition unit with a predetermined reference voltage so as to detect a fluctuation of the voltage applied to the capacitor, and determines power to be outputted by the storage battery so as to suppress the fluctuation of the voltage applied to the capacitor; and
an informing unit that informs the storage battery of a current value corresponding to the power to be outputted by the storage battery,
wherein said determination unit detects the state of deterioration of the storage battery using the deterioration information acquired by said acquisition unit, and determines power to be outputted by the storage battery by adjusting a charge time or a discharge time of the storage battery in accordance with the state of deterioration of the storage battery, and
said power storage device includes:
the storage battery;
a current controller that controls a current to be charged or discharged to or from the storage battery in response to receiving the current value from said power control device; and
a detection unit that detects deterioration information indicating the state of deterioration of the storage battery so as to transmit the deterioration information to said power control device,
wherein said determination unit included in the power control device detects the state of deterioration of the storage battery using the deterioration information acquired by said acquisition unit, and adjusts a charge time or a discharge time of the storage battery in accordance with the state of deterioration of the storage battery.
10. A method for controlling power, comprising:
acquiring, using a processor, voltage information and deterioration information, the voltage information indicating information of a voltage being applied to a capacitor provided between a power generation unit and a load via a first power supply line and a second power supply line, the deterioration information indicating a state of deterioration of a storage battery connected to the power generation unit via the first power supply line and the second power supply line;
comparing, using the processor, the voltage information acquired in said acquiring with a predetermined reference voltage so as to detect a fluctuation component of the voltage applied to the capacitor;
determining, using the processor, power to be outputted by the storage battery so as to suppress a fluctuation of a voltage applied to the capacitor; and
informing, using the processor, the storage battery of a current value corresponding to the power to be outputted by the storage battery,
wherein in said determining, the state of deterioration of the storage battery is detected using the deterioration information acquired in said acquiring, and a charge time or a discharge time of the storage battery is adjusted in accordance with the state of deterioration of the storage battery.
11. A non-transitory computer readable recording medium on which a program is recorded, the program causing a computer to execute the method for controlling power according to claim 10 .