Abstract: A feeding system that feeds power to a load includes only a single device configured to have neutral point high-resistance between a feeding line and the earth. The device functions as a ground fault overvoltage detection type of ground fault detector. The feeding system further comprises a control device. When the ground fault overvoltage detection type of ground fault detector detects a ground fault, the ground fault overvoltage detection type of ground fault detector transmits, to the control device via a signal line, a signal indicating that the ground fault has occurred. The control device instructs a breaker corresponding to the specific distributed unit in which it is determined that the ground fault has occurred to perform breaking.

Abstract: There are included: generation means for generating predetermined information represented by a bit string; and control means for controlling a phase difference between current and voltage of AC power at predetermined time intervals so that each bit value included in the bit string is represented.

Abstract: Disclosed is a power management device including a monitoring unit configured to monitor power usage statuses of a plurality of sites individually, a determination unit configured to determine whether to supply the surplus power to a second site of the plurality of sites when the monitoring unit detects that surplus power is generated in a first site of the plurality of sites in accordance with a prediction of a power transmission loss between the first site and the second site, and a site control unit configured to instruct the first site to supply the surplus power to the second site when the determination unit determines that the surplus power is to be supplied to the second site.

Abstract: A feeding system feeds power from a power unit to a load via a feeding line and includes a protection device configured to operate by a current equal to or greater than a predetermined current; a monitoring unit configured to monitor whether an accident occurs in the feeding line; and a gate block unit configured to stop the feeding of the power of the power unit when the monitoring unit detects that an accident causing the protection device not to operate has occurred.

Abstract: A communication apparatus for performing communication via an optical fiber includes a photoelectric converter configured to convert an optical signal input from the optical fiber into electricity through photoelectric conversion, and a functional unit configured to operate using the electricity converted from the optical signal by the photoelectric converter.

Abstract: Provided is a power management apparatus for determining an order of priority with respect to power supply to a consuming device at a target location in a power system that includes a plurality of locations between which power can be interchanged, the target location including at least the consuming device, a power generation unit that generates power from natural energy, a power storage unit, and a commercial power source. The power management apparatus includes a determination unit for determining an order of priority among a plurality of controlled objects including at least power supply from the power generation unit, power supply from the power storage unit, power supply from the commercial power source, and power consumption reduction by transferring a load from the consuming device, and a priority setting unit for setting the order of priority that has been determined by the determination unit for the target location.

Abstract: A control device includes a determination means that determines, when a request is received in which a power amount that is requested to be supplied, and an energy source or a type of the energy source of the power amount are specified, whether or not a supply of electric power that satisfies the energy source or the type of the energy source and the power amount that are specified in the request is possible by referring to a table that manages a stored power amount stored in a storage battery for each energy source or for each type of the energy source, and a control means that causes the power amount specified in the request to be discharged from the storage battery when it is determined by the determination means that the supply of electric power is possible.

Abstract: Provided is a communication apparatus for making connection to a communication network, including: an optical network unit; and an external power supply input/output terminal, the communication apparatus being configured such that electrical power is fed to the optical network unit from an external terminal that is connected to the external power supply input/output terminal and functions as an auxiliary power supply.

Abstract: A DC power distribution system for performing DC power distribution from a power distribution side base to one or more power reception side bases via a power distribution network includes measuring instruments provided at the power distribution side base and at the one or more power reception side bases, and a control device, in which the control device includes an operation unit that acquires a voltage value and a current value measured by the measuring instrument and calculates an output side power sum that is a sum of power output from the power distribution side base, a power reception side power sum that is a sum of power input to the one or more power reception side bases, and a loss sum between the power distribution side base and the one or more power reception side bases, and a control unit that detects an abnormality in the distribution network by comparing the output side power sum with a total sum of the power reception side power sum and the loss sum.

Abstract: A connection direct-current power distribution system including a first direct-current power distribution system having a first voltage range and a second direct-current power distribution system having a voltage range narrower than the first voltage range includes a switch and a converter between the first direct-current power distribution system and the second direct-current power distribution system, and the switch is caused to enter a connected state, and power from a first storage battery in the first direct-current power distribution system is supplied to the second direct-current power distribution system via the converter configured to adjust a voltage of the power.

Abstract: Provided is a power management apparatus for controlling power distribution from a location that includes a storage battery and a current control type converter to another location that includes a storage battery, the power management apparatus including: a monitor unit that acquires a status of the storage battery at each location; a judgment unit that determines, based on the status of the storage battery at each location that has been acquired by the monitor unit, a duration of power distribution to a certain location, and one or more locations from which power is to be distributed to the certain location; and a control unit that controls each location serving as a distribution source such that power distribution is performed for the duration determined by the judgment unit.

Abstract: A direct-current power distribution system for distributing power from a power supply device to a load device via a power distribution network includes a measuring instrument included in the power distribution network, and a control device including a determination unit configured to acquire a voltage value and a current value measured by the measuring instrument, and determine an operating state in the direct-current power distribution system on the basis of a waveform indicating change in the voltage value and a waveform indicating change in the current value.

Abstract: A power transaction control device for virtually performing a power transaction between a plurality of grids includes a data storage unit that stores order information about power trading between the plurality of grids, and a matching unit that establishes the power transaction between a first site of a first grid of the plurality of grids and a second site of a second grid of the plurality of grids when a pair of the first site and the second site each having an identical price for a selling order and a purchase order of power is established, and when existence of a site that interchanges balancing power identical to balancing power interchanged by the first site in the first grid and existence of a site that interchanges balancing power identical to balancing power interchanged by the second site in the second grid are detected in accordance with order information.

Abstract: A control apparatus that controls power consumption in a service providing system configured to provide a service using servers provided, respectively, in a plurality of bases placed in a geographically dispersed manner, the apparatus including: a target power setting unit configured to set target power values of the respective bases based on requests for increases/decreases in power consumption in the bases equipped with the servers; and a load balance setting unit configured to perform load transfer among a plurality of servers based on the target power values.

Abstract: A feeding system that feeds power to a load includes only a single device configured to have neutral point high-resistance between a feeding line and the earth. The device functions as a ground fault overvoltage detection type of ground fault detector. The feeding system further comprises a control device. When the ground fault overvoltage detection type of ground fault detector detects a ground fault, the ground fault overvoltage detection type of ground fault detector transmits, to the control device via a signal line, a signal indicating that the ground fault has occurred. The control device instructs a breaker corresponding to the specific distributed unit in which it is determined that the ground fault has occurred to perform breaking.

Abstract: A feeding system feeds power from a power unit to a load via a feeding line and includes a protection device configured to operate by a current equal to or greater than a predetermined current; a monitoring unit configured to monitor whether an accident occurs in the feeding line; and a gate block unit configured to stop the feeding of the power of the power unit when the monitoring unit detects that an accident causing the protection device not to operate has occurred.

Abstract: Provided is a communication system including a communication building side communication device in a communication building and a user's home side communication device in a user's home that are connected via an optical fiber and a metal cable. When a power fed to the user's home side communication device from a commercial power supply stops, the communication building side communication device feeds the power to the user's home side communication device via the metal cable to operate the user's home side communication device, and the user's home side communication device communicates with the communication building side communication device via the optical fiber.

Abstract: A model management apparatus for managing a power grid model having, as a model value, a parameter of a power grid connecting a plurality of sites includes: a storage unit configured to store the model value; a monitoring unit configured to acquire a measured value from each site in the power grid; and a model correction unit configured to calculate a parameter in the power grid based on the measured value obtained from the monitoring unit, and correct the model value using the calculated parameter.

Abstract: Provided is a power management apparatus for determining an order of priority with respect to power supply to a consuming device at a target location in a power system that includes a plurality of locations between which power can be interchanged, the target location including at least the consuming device, a power generation unit that generates power from natural energy, a power storage unit, and a commercial power source. The power management apparatus includes a determination unit for determining an order of priority among a plurality of controlled objects including at least power supply from the power generation unit, power supply from the power storage unit, power supply from the commercial power source, and power consumption reduction by transferring a load from the consuming device, and a priority setting unit for setting the order of priority that has been determined by the determination unit for the target location.

Abstract: Provided is a power management apparatus for controlling power distribution from a location that includes a storage battery and a current control type converter to another location that includes a storage battery, the power management apparatus including: a monitor unit that acquires a status of the storage battery at each location; a judgment unit that determines, based on the status of the storage battery at each location that has been acquired by the monitor unit, a duration of power distribution to a certain location, and one or more locations from which power is to be distributed to the certain location; and a control unit that controls each location serving as a distribution source such that power distribution is performed for the duration determined by the judgment unit.