Abstract: According to one embodiment, a charge/discharge system includes a storage battery and a control device. The storage battery is configured to absorb CO2 during charging and release CO2 during discharging. The control device is configured to control a charge/discharge operation of the storage battery. The control device is configured to calculate a power trading price. The control device is configured to calculate a power trading price. The control device is configured to control the charge/discharge operation of the storage battery to perform charging and discharging when the power trading price during charging is lower than the power trading price during discharging.

Abstract: According to one embodiment, a solar cell system includes a first solar cell, a first electric circuit and controller. The first solar cell is provided on a hood of a vehicle. The first electric circuit is connected to the first solar cell. The controller is configured to electrically connect the first solar cell with the first electric circuit in a case where a traveling speed of the vehicle is less than a first threshold, and electrically disconnect the first solar cell from the first electric circuit in a case where the traveling speed of the vehicle is equal to or greater than the first threshold.

Abstract: According to one embodiment, a power supply/demand device includes a virtual synchronous inverter and a storage battery. The virtual synchronous inverter is connected to a power system. Charging and discharging of the storage battery are controlled by the virtual synchronous inverter. The virtual synchronous inverter is connected to the power system in parallel with other inverters. The virtual synchronous inverter is capable of calculating a first standby time having any length and performing control of the storage battery corresponding to an operation instruction after a lapse of the first standby time, when receiving the operation instruction accompanied by output of power to the power system or input of power from the power system.

Abstract: According to one embodiment, a power supply device connected to a power grid is provided. The power supply device includes an inverter, a control unit configured to control operation of the inverter using a first parameter value so as to simulate characteristics of a synchronous generator, and an acquisition unit configured to obtain a second parameter value different from the first parameter value. The control unit is configured to control the operation of the inverter by changing the first parameter value to the acquired second parameter value.

Abstract: According to one embodiment, a charging system charges a secondary battery provided in a mobile body. The charging system includes a controller which selects one of a first charge mode which charges the secondary battery by simulating a synchronous generator and a second charge mode which charges the secondary battery without simulating the synchronous generator, and a charger which charges the secondary battery by an operation corresponding to the first charge mode or the second charge mode selected by the controller.

Abstract: A power conditioning system includes a control circuit. The control circuit is configured to switch a output control mode to any one of a first mode in which an operation not based on inertia is executed and a second mode in which an operation based on inertia is executed, performs output control according to a first rating in the first mode, and performs output control according to a second rating different from the first rating in the second mode.

Abstract: A power transmitting apparatus including a power supply to generate AC power; a power transmitting inductor to transfer the AC power to a power receiving apparatus through magnetic coupling with a power receiving inductor in the power receiving apparatus; a mutual coupling adjusting unit to adjust a relative position between the power transmitting inductor and the power receiving inductor; and a control unit to control the mutual coupling adjusting unit based on a mutual coupling coefficient between the power transmitting inductor and the power receiving inductor. The control unit controls the mutual coupling adjusting unit so that the mutual coupling coefficient falls within a predetermined range and an upper limit of the predetermined range is a value less than a maximum of the mutual coupling coefficient between the power transmitting inductor and the power receiving inductor.

Abstract: An inductor unit according to one embodiment includes a first inductor comprising a first core and a first winding wound around the first core; and a second inductor comprising a second core and a second winding wound around the second core. The first inductor and the second inductor are disposed so that an angle is larger than 0 degree and smaller than 90 degrees. The angle is formed by: a first straight line coupling a first intersection point of a first center line in parallel with a first magnetic flux direction of the first core and a second center line perpendicular to the first magnetic flux direction, and a second intersection point of a third center line in parallel with the second magnetic flux direction of the second core and a fourth center line perpendicular to the second magnetic flux direction; and the first center line.

Abstract: According to one embodiment, an inductor unit includes a first inductor and a second inductor. The first inductor includes a first magnetic core and a first coil winded around the first magnetic core. The second inductor includes a second magnetic core and a second coil winded around the second magnetic core. The first inductor and the second inductor are placed so that a first angle between a first line and a fifth line is equal to or greater than 0 degrees and is equal to or less than 90 degrees. The cross section of the first coil in the width direction and a cross section of the first coil in the width direction are overlapping at least at direction of the first magnetic flux or direction of the second magnetic flux.

Abstract: According to one embodiment, an inductor unit includes a first inductor and a second inductor. The first inductor includes a first magnetic core and a first coil winded around the first magnetic core. The second inductor includes a second magnetic core and a second coil winded around the second magnetic core. The first inductor and the second inductor are placed so that a first angle between a first line and a fifth line is equal to or greater than 0 degrees and is equal to or less than 90 degrees. The cross section of the first coil in the width direction and a cross section of the first coil in the width direction are overlapping at least at direction of the first magnetic flux or direction of the second magnetic flux.

Abstract: A wireless power transmission device related to embodiments of the present invention includes a plurality of power transmission resonators, a communicator, a power transmission controller and a power transmission circuit. The communicator receives information related to a power receiving resonator provided in a power receiving device. The power transmission controller selects a power transmission resonator to be used in power transmission from the plurality of power transmission resonators based on the information related to the power receiving resonator. The power transmission circuit transmits an electric current to the power transmission resonator to be used in the power transmission.

Abstract: In one embodiment, a coil includes a magnetic core and a winding. The magnetic core includes at least one block provided with a groove or an opening. Each block is arranged so as to make the groove or the opening extend along a direction of magnetic flux. The coil is used as a power transmitting coil or a power receiving coil.

Abstract: According to one embodiment, there is provided a power transmitting device including: a power supply, a resonator, an adjuster and a controller. The power supply supplies AC power. The resonator includes a magnetic core and a coil wound around the magnetic core, the resonator wirelessly transmitting the AC power supplied from the power supply to a different resonator arranged to be opposed to the resonator. The adjuster relatively moves the coil and the magnetic core along a longitudinal direction of the coil. The controller controls the adjuster based on a value of current flowing in the resonator to adjust relative positions of the magnetic core and the coil.

Abstract: According to one embodiment, a power transmission device includes: a power transmitter, a frequency control circuit and a voltage control circuit. The power transmitter transmits AC power by causing a coil to generate a magnetic field in response to AC power and coupling the magnetic field to a coil of a power receiver. The frequency control circuit sweeps a frequency of the AC power during the power transmission. The voltage control circuit controls a voltage of the AC power, based on a target condition of a ratio between a voltage of power received by the power receiver and a voltage of the AC power.

Abstract: A power transmission system according to an embodiment includes a transmitting device and a receiving device. The transmitting (receiving) device includes a transmitting (receiving) housing and a transmitting (receiving) coil. The transmitting (receiving) housing includes a first transmitting (receiving) surface and a second transmitting (receiving) surface. The transmitting (receiving) coil includes a first transmitting (receiving) part and a second transmitting (receiving) part. A first facing area and a second facing area at the reference position are set such that change of strength of magnetic coupling between the transmitting coil and the receiving coil of when the receiving device is moved in a direction perpendicular to the first transmitting surface becomes smaller than change of strength of magnetic coupling between the transmitting coil and the receiving coil of when the receiving device is moved in a direction perpendicular to the second transmitting surface.

Abstract: A power transmission device in a mode of the present invention includes a first power transmitter configured to generate a first magnetic field; and a second power transmitter configured to generate a second magnetic field having a phase opposite to a phase of the first magnetic field. Further, changing a frequency of the first magnetic field to a new value by the first power transmitter and changing a frequency of the second magnetic field to the new value by the second power transmitter are performed at the same timing.

Abstract: According to one embodiment, a mobile machine includes a mobile body and a plurality of power transmission resonators. The mobile body is capable of being tilted in a particular direction such that a distance between a particular part opposed to a travel surface and the travel surface is reduced. The plurality of power transmission resonators are arranged at portions of the particular part of the mobile body, heights of the portions with reference to the travel surface being approximately identical with each other in a state of the mobile body being tilted.

Abstract: According to one embodiment, an inductor includes a magnetic substance core, a coil, a cast case and a cast resin. The coil is wound around the magnetic substance core. The cast case has a body at least partially formed from conductive substance, stores the magnetic substance core and the coil. The cast resin that is formed from a first resin which is an insulator, is located within the cast case, covering the magnetic substance core and the coil.

Abstract: A wireless power transmission device related to embodiments of the present invention includes a plurality of power transmission resonators, a communicator, a power transmission controller and a power transmission circuit. The communicator receives information related to a power receiving resonator provided in a power receiving device. The power transmission controller selects a power transmission resonator to be used in power transmission from the plurality of power transmission resonators based on the information related to the power receiving resonator. The power transmission circuit transmits an electric current to the power transmission resonator to be used in the power transmission.

Abstract: A power transmitting apparatus including a power supply to generate AC power; a power transmitting inductor to transfer the AC power to a power receiving apparatus through magnetic coupling with a power receiving inductor in the power receiving apparatus; a mutual coupling adjusting unit to adjust a relative position between the power transmitting inductor and the power receiving inductor; and a control unit to control the mutual coupling adjusting unit based on a mutual coupling coefficient between the power transmitting inductor and the power receiving inductor. The control unit controls the mutual coupling adjusting unit so that the mutual coupling coefficient falls within a predetermined range and an upper limit of the predetermined range is a value less than a maximum of the mutual coupling coefficient between the power transmitting inductor and the power receiving inductor.