Fujitsu Corporation

Tetsuya Kashiwagi

Yuichi Matsufuji

Hironobu Kitajima

Sari Kawashima

Mioto Yoshida

Yuriko Korenaga

A recording medium stores a program for causing a computer to execute a process including: specifying, based on simulation data, related to an operation of a power distribution facility including power distribution lines and one or more transformers coupled to a phase corresponding to two of the power distribution lines, a correlation relationship between a phase current flowing through the transformer and a line current flowing through power distribution line; generating a scatter diagram indicating a degree of correlation between the phase current and each line current; calculating a probability density at each position in the scatter diagram; and determining, based on a position in a case where actual data of the phase current and the line current in the operation of the power distribution facility is plotted in the scatter diagram and a calculation result of the probability density, a coupling phase of the transformer in the actual data.

Computer-readable recording medium storing transformer coupling phase determination program, transformer coupling phase determination apparatus, and transformer coupling phase determination method

A non-transitory computer-readable medium storing a program that causes a computer to execute a process including, calculating, for each of a plurality of groups each of which is a combination of two power distribution lines selected from a plurality of power distribution lines, an index value that indicates a correlation between time-series data of a sum of line currents that flow through the two power distribution lines included in a group and time-series data of consumed power consumed by at least one consuming subject coupled to a transformer coupled to any one of phases that corresponds to combinations of two of the plurality of power distribution lines or current that corresponds to the power; and determining that a phase that corresponds to the group that corresponds to the index value indicating a highest correlation among the plurality of groups is a connection phase to which the transformer is coupled.

Transformer connection phase determination program, device, and method

A first time-series data set indicating first measured values obtained by a first device and a second time-series data set indicating second measured values obtained by a second device are obtained. First alignment is performed to convert the positions in the time domain of the first measured values belonging to a second period, based on the first measured values belonging to a first period. Second alignment is performed to convert the positions in the time domain of the second measured values belonging to the second period, based on a relationship between positions before and after the conversion. Correlation analysis is performed between third and fourth time-series data sets respectively obtained by the first and second alignment. The existence or absence of an inclusion relationship in which the second measured values contain a component of the first measured values is determined based on the correlation analysis result.

Determination method and determination apparatus

A power distribution management apparatus includes an electrical connection storage unit, a search unit, and an output unit. The electrical connection storage unit is configured to store electrical connection information in which a combination of a plurality of junctions that describes which a plurality of facilities of a power distribution system are electrically connected to each other and a facility determined based on the combination are associated. The search unit is configured to search a facility corresponding to the combination while investigating an uninvestigated junction among the plurality of junctions contained in the combination starting from a predetermined junction with reference to the electrical connection information stored in the electrical connection storage unit. The output unit is configured to output facility information obtained from the combination where the investigation is performed and a result of the search after the investigation and the search are performed.

Power distribution management apparatus, power distribution management method, and recording medium

A facility selection supporting device calculates a total current value of consumers located in and after a certain power supply section on the way from a distribution substation to a particular consumer and outputs a recommended distribution facility for the power supply section based on the calculated total current value.

Facility selection supporting method and facility selection supporting device

A power distribution management apparatus includes: a memory configured to store history information including a pattern of open and closed states of switches that switch a path that supplies power between a substation and load equipment of a customer, and attribute information related to an environment where the power is supplied; and a processor configured to execute a process. The process includes: upon acceptance of specification of the attribute information related to the environment, calculating a degree of similarity between the specified attribute information and attribute information included in the history information; and extracting a pattern of the open and closed states of switches whose degree of similarity satisfies a predetermined condition among the history information.

Power distribution management apparatus, pattern extraction method, and recording medium

A power distribution management apparatus includes an acquisition unit and a detection unit. The acquisition unit is configured to acquire predetermined data at a predetermined interval from meters classified into a predetermined group, the data containing power consumption. The detection unit is configured to detect, as an abnormal place, a facility of a power distribution system associated with the group when the predetermined data is not acquired within the predetermined interval from the respective meters included in the group.

Power distribution management apparatus and abnormality detection method

A first calculating unit calculates a load current of each distribution facility based on a sending voltage in a power source facility and load information on power consumption facilities in an electrical circuit including the power source facility, the distribution facilities, and the power consumption facilities connected to one another to form the electrical circuit. A second calculating unit calculates the amount of power loss in each distribution facility based on the calculated load current of each distribution facility.

Loss calculation method and loss calculating device

A power distribution management apparatus () stores electrical connection information in which a combination of a plurality of junctions at which a plurality of facilities of a power distribution system are electrically connected to each other and a facility determined based on the combination are associated, and searches a facility corresponding to the combination while investigating an uninvestigated junction among the plurality of junctions contained in the combination starting from a predetermined junction with reference to the electrical connection information, and acquires a display scale for displaying the power distribution system, and displays a facility having a junction near a substation from a predetermined facility among the facilities obtained as a result of the searching when the scale is equal to or less than a predetermined scale, and displays a facility obtained as a result of the searching when the scale is larger than the predetermined scale.

Power distribution management apparatus, display control method, and recording medium

A power distribution management apparatus () includes acquiring the amount of demand obtained by forecasting the amount of power to be used by load equipment of a customer, and the amount of power generation obtained by forecasting the amount of power to be generated by power generation equipment of the customer, and setting a plurality of voltage values as a plurality of candidates for a transmission voltage from a substation of a power distribution system, and calculating a voltage at a connection point of the load equipment of the customer and equipment of the power distribution system at each of the plurality of candidates by utilizing a difference between the demand amount and the power generation amount of each customer, and determining the transmission voltage of the substation from the plurality of candidates based on a result of the calculating.

Power distribution management method, voltage determination method, and recording medium for determining transmission voltage of substation

A power distribution management apparatus () includes acquiring a measurement result from a meter connected to a customer's load facility which receives a distributed power from a power distribution system, and using different display representation to display a facility where electricity flows from the load facility toward the facility of the power distribution system among facilities of the power distribution system to be distinguished from a facility where electricity flows from the facility of the power distribution system toward the load facility utilizing the measurement result of the meter.

Growing community of inventors

Fukuoka, Japan

Tetsuya Kashiwagi