An energy storage system and a method of controlling the same is provided. The energy storage system may directly provide generated DC power or DC power stored in a battery to a DC load without performing a DC/AC conversion or an AC/DC conversion. Furthermore, in the case where a grid operates abnormally (e.g. power interruption) and the energy storage system functions as an uninterruptible power supply (UPS), power stored in a battery may be selectively provided to loads according to power remaining in a battery, and thus stored power may be used stably.

Energy storage system and method of controlling the same

A controller executes local generation and local consumption pathways of: supplying power from a solar cell to an appliance, and charging a storage cell with power that remains after subtracting power consumed by the appliance from the solar cell power. In the absence of excess power, the storage cell and solar cell supply power. Power supply from a commercial electrical grid covers a power shortage that remains after subtracting solar cell power and storage cell power from the power consumed by the appliance. The controller also executes a second excess power selling mode pathway wherein excess power flows into the commercial electrical grid, and an assist mode wherein all solar cell power flows into the commercial electrical grid, and storage cell power flows to the appliance.

Power supply system.

A power distribution system includes a direct current (DC) power source and an appliance selection unit for selecting one or more appliances that can be operated with an available power of the DC power source. The power distribution system further includes a display unit for displaying results of selection by the appliance selection unit.

Power distribution system

An electric power supply system can determine a sharing ratio of an electric power so as to increase and decrease an output electric power supplied by an electric power generator in accordance with an output electric power value required for the electric power supply system, in a fuel cell following region where a frequency of a magnitude of the electric power is equal to or higher than a predetermined value in a frequency distribution of a magnitude of the electric power, and can determine the sharing ratio of the electric power so as to increase an output electric power supplied by an electricity storage device, in an assist region where the frequency is lower than a predetermined value in the frequency distribution, and can prevent an excess of discharging from an electricity storage device.

Electric power supply system

In order to provide a power control device that supplies stable power to a load while deterioration of a storage battery is suppressed, a power control device (105) according to the invention is provided with: an acquisition unit (201) which acquires voltage information of voltage applied to a capacitor that is provided, by way of a first power line and a second power line, between a prescribed generation means and a load, and which acquires deterioration information indicating the deterioration condition of a storage battery connected to the prescribed generation means; a determination unit (202) which compares the acquired voltage information and a prescribed reference voltage to detect a fluctuation component of the voltage applied to the capacitor, and which determines the power that is output to the storage battery in such a way that the fluctuation component of the voltage applied to the capacitor is suppressed; and an instruction value notification unit (203) which notifies the storage battery of a current instruction value corresponding to the power that is output to the storage battery. The determination unit (202) detects the deterioration condition of the storage battery by using the deterioration information, and determines, in accordance with the deterioration condition of the storage battery, the power that is output to the storage battery.

Power control device, power control method, and power supply system

A DC power distribution system is equipped with a storage device having a first storage battery, which discharges to electrical apparatuses only during power failure, and a second storage battery, which discharges to electrical apparatuses when service is not interrupted The electricity storage device and electrical apparatuses are supplied with DC power from a power generation device which generates electricity using natural energy, and DC power which has been converted from AC power supplied from a commercial power source When the power supply from the electricity generation device and the commercial power source is interrupted, the first storage battery discharges power to the electrical apparatuses

Dc power distribution system

A power conversion system includes a power conversion device, a connector, and a processing module. The power conversion device is connected to a power system. The attached state and the unattached state of the connector relative to a connecting port that is provided in an apparatus having a battery mounted therein can be selected. The processing module is configured to determine that a malfunction has occurred when a voltage is applied to a portion that electrically connects the connector and the connecting port in a period in which transmission of electric power with respect to the battery is stopped.

Power conversion system and connector

Connector for electrical connection includes coupler, cable, switch mechanism, failure detector and transmitter. Coupler is removably inserted in and connected to reception side connector provided in machine which is equipped with storage battery. Cable includes two or more electric wires including power line configured to be electrically connected to reception side connector via coupler. Cable is connected to device that performs at least one of supplying power to machine and receiving power from machine. Switch mechanism opens and closes electrical circuit between coupler and power line. Failure detector detects occurrence of failure of coupler. Transmitter transmits detection result of failure detector to device through at least one first electric wire of the two or more electric wires. Switch mechanism opens and closes the electrical circuit in accordance with control signal transmitted through first electric wire.

Connector for electrical connection

A current detection device includes: a core to be disposed in the vicinity of a conductor as a detection target; a winding wound around the core; an excitation unit configured to apply an excitation signal, having a magnitude and a direction that change at a constant period, to the winding; a magnetic flux detection unit (comparator and averaging circuit) configured to detect a magnetic flux generated in the core due to current flowing through the conductor; and an adder unit configured to add a feedback signal to the excitation signal such that the magnetic flux detected by the magnetic flux detection unit is cancelled.

Current detection device

This connector for electrical connection for electrically driven vehicle includes: a contact portion configured to electrically connect an electric cable, electrically connected with one of an electrically driven vehicle or a power apparatus, with the other; and a main body. Main body houses therein the contact portion, a power cutoff portion and a first abnormality detector. Power cutoff portion is configured to switch opening/closing of a feed line between the electrically driven vehicle and the power apparatus. First abnormality detector is configured to detect an abnormality that occurs in the feed line, or externally receive an abnormal signal. Power cutoff portion is configured to open the feed line, when first abnormality detector detects the abnormality or receives the abnormal signal. First abnormality detector is configured to detect, as the abnormality, at least one of a short-circuit current in the feed line or an overload current in the feed line.

Takuya Kagawa

Papers

Dc power distribution system

Power conversion system and connector

Connector for electrical connection

Current detection device

Connector for electrical connection for electrically driven vehicle