Hitachi, Ltd.

Xanavi Informatics Corporation

Tohoku Electric Power Company, Inc.

Tohoku Electric Manufacturing Co., Ltd.

Clarion Co

Kenichiro Yamane

Masatoshi Kumagai

Takayoshi Yokota

Takumi Fushiki

Junsuke Fujiwara

Yoshinori Endo

Kimiyoshi Machii

Mariko Okude

Shigeru Matsuo

Masahiro Watanabe

Shota Omi

Takeshi Inoue

Kimiya Yamaashi

Yukihiro Kawamata

Hirotaka Takahashi

Yasushi Tomita

Shinichi Amaya

Masato Horita

Manabu Kato

Katsuhiro Matsuda

Ryo Egashira

Jun Murakoshi

Masayuki Miyazaki

Yasuo Sato

Toshiyuki Miyake

Masahiro Yatsu

Kunihiko Tsunedomi

Yasushi Harada

Toshiyuki Sawa

Yasutaka Serizawa

Ryo Nakano

Noriyuki Uchiyama

Tatsuki Inuduka

Hideo Hiroshige

Tsukasa Onishi

Taichiro Kawahara

Seiji Ukai

Yukihiro Takatani

Tsukasa Oonishi

Tomoya Sato

Satoru Harada

Takuya Matsumoto

Takafumi Futakami

Toshiyuki Seto

A power demand/supply adjustment power procurement plan support device supports a power system through a power transaction in the power market and has an added power transmission capacity analysis means and a target power transmittable capacity determination means. The added power transmission capacity analysis means obtains: actual power supply data including a power supply having supplied power to the power system and the actual value of a power supply amount; an actual power system stabilization data including a power supply performing power supply restriction for power system stabilization, an electric control amount or a customer facility performing a load restriction, and the actual value of a load control amount; and an actual power demand/supply adjustment power procurement data including a procurement amount of the power demand/supply adjustment power of a power supply participating in the power market and the actual value of the total procurement cost.

Power demand/supply adjustment power procurement plan support device and method, and power demand/supply adjustment power procurement plan support system

It is possible by means of a system simulation device to extract a disturbance mode wherein multiple accident conditions are assumed and to determine control parameters, but when the number of accident conditions increases, a threshold value pertaining to a divergence constant deviates prior to an update period, with the result that an uncontrollable disturbance mode appears. In order to solve this problem, the present invention is a power system stabilization system for determining control parameters for a control device connected to a power system, the power system stabilization system equipped with: a disturbance mode prediction unit for predicting a disturbance mode of a power system on the basis of operation information and an assumed system configuration for the power system; a post-control parameter update period prediction unit for predicting an update period for a post-control parameter in post-control after a disturbance has occurred; a threshold value setting unit for setting a threshold value pertaining to a divergence constant on the basis of the disturbance mode and the update period for the post-control parameter; and a control parameter determination unit for determining a control parameter of the control device on the basis of the disturbance mode and the threshold value.

Power system stabilization system and method

A system stabilization system () is provided with: at least one of a power flow state database (DB) and a system configuration database (DB); a device state database (DB) in which the device states of a stabilizing device are recorded; a stabilizing effect index calculation function () for indexing the stabilizing effect of the stabilizing device on the basis of a device state and one or both of a power flow state and a system configuration; and a display means for displaying or outputting a stabilizing effect index obtained by the stabilizing effect index calculation function, in contrast with contrasted elements included in the device state, the power flow state, and the system configuration.

Power system stabilization system

A power system control instruction device performing a control instruction to the control device that controls the power system on the basis of a measured value transmitted from a sensor measuring a state value of the power system and a method for performing such a control instruction are provided. The device obtains a centralized control amount using a measured value of the sensor such that a system voltage meets a predetermined control purpose, and creates a distributed control model using the measured value and the centralized control amount. The device then determines whether or not a voltage deviation from the voltage appropriate range occurs when the control device performs control on the basis of the distributed control model, and re-creates the distributed control model when the voltage deviation occurs, and transmits the distributed control model that is re-created to the control device.

Power system control instruction device and method for controlling a voltage of a power system

The output of a photovoltaic power generator is estimated by estimating a solar radiation amount at a point different from solar radiation measurement points and determining an estimation error amount from solar radiation values measured at limited points. A photovoltaic power generator output estimation method estimates an output of a photovoltaic power generator based on a measured solar radiation value. The method includes a first estimation method of estimating a solar radiation amount at a photovoltaic power generator installation point from solar radiation meter installation point information, a value measured by a solar radiation meter, and photovoltaic power generator installation point information; a second estimation method of estimating the solar radiation amount at the photovoltaic power generator installation point in a manner different from that of the first estimation method; an output estimation method of estimating the output of the photovoltaic power generator from an estimated solar radiation amount and a rated capacity of the photovoltaic power generator; and an error estimation method of determining an estimation error of a photovoltaic power generator output from a difference between the first and second estimation methods.

Photovoltaic power generator output estimation method and device, and power system monitoring device using same

In a multi-hop radio communication network including a base station (a radio station connected to a management server), each radio station in the network is given a data transmission opportunity in turn according to a predetermined transmission order, and transmits data via broadcast or multicast upon occurrence of transmission timing. The radio station having received the data adds data of the radio station to the received data and then forwards the packet via broadcast or multicast when it is the radio station's turn for transmission.

Multi-hop radio communication method

A distributed controller collects measurement value data of a voltage and a current in an own node and in another node; using the measurement voltage and the current of the own node and the measurement voltage and current of another node as input data, estimates a voltage or a current as a state quantity of the electric power system regarding another node from which the measurement value data cannot be collected, and outputs the estimate values; using the measurement data, the estimate value outputted from the state estimation functional unit and a voltage target value that has been set for each node, outputs the control commands for voltage controllers based on voltage change amounts to be distributed to the voltage control devices of the nodes including the own node. The voltages in the electric power system are controlled by superposition of voltage change amounts by the voltage control devices.

Power system control system and distributed controller used in same

To control a power state of a power system properly according to a communication state. A system for controlling a power system includes a plurality of sensor devices configured to output measurement data; a first control apparatus configured to estimate a first power state of the power system by using the measurement data obtained by the plurality of sensor devices, calculate a first controlled variable according to the estimated first power state, and output the calculated first controlled variable; and at least a second control apparatus configured to execute a predetermined control operation according to either the first controlled variable calculated in the first control apparatus, or a second controlled apparatus calculated in the second control apparatus. When it is not able to obtain part of the measurement data, the first control apparatus estimates the first power state by using predetermined measurement data among the obtained measurement data.

System and method for controlling power system

A voltage adjustment device, a voltage adjusting method and a power control system for a distribution system are provided, in which the voltage adjustment device and a static var compensator are appropriately operated in a coordinated manner and the sustention of voltage and the enhancement of the operation efficiency are attained. A voltage adjustment device for a distribution system is installed in the distribution system including a static var compensator on an end side and controls a secondary voltage to be within a predetermined limit value by adjusting a tap position. The voltage adjustment device includes a first unit configured to estimate the secondary voltage; a second unit configured to obtain a corrected voltage by correcting the estimated secondary voltage by using a correction amount obtained from an output of the static var compensator; and a third unit configured to compare the corrected voltage with the predetermined limit value and operate the tap position when the corrected voltage deviates from the predetermined limit value.

Voltage adjustment device for power distribution system, voltage adjusting method, and power control system

Disclosed is a traffic information distribution apparatusincluding date-time information in traffic information acquired by the traffic information acquire unitor generated by the traffic information prediction unit, and accumulates the traffic information in the traffic information DB. When the traffic information distribution apparatusreceives distribution request information transmitted from the in-vehicle terminal, based on date-time information of reference traffic information held by the in-vehicle terminalincluded in the distribution request information, the traffic information distribution apparatusretrieves traffic information including the same date-time information as the date-time information of the reference traffic information from the traffic information DB. Then, difference traffic information generation unitgenerates difference traffic information between the retrieved traffic information and traffic information to be distributed, and the traffic information distribution apparatusdistributes the generated difference traffic information to the in-vehicle terminal

Traffic information distribution method, traffic information distribution apparatus and in-vehicle terminal

The present invention relates to a method and apparatus for determining traffic data. The method comprises the steps of providing statistical data relating to traffic at links of a street map, providing condition data relating to links of the street map, and determining traffic data based on the statistical data and the condition data.

Method and apparatus for determining traffic data

There is provided a method for displaying traffic information, a navigation system, and a program for displaying the traffic information. A data processing unit receives a specified time, which is a future or current time, through an operation input unit, specifies an area of a map to be displayed, and then obtains map data of the specified area from a map data storage unit. The data processing unit obtains traffic informationof the specified time from a traffic information storage unit, and then makes the display unit show links in association with the traffic information. It is, therefore, possible to display the traffic information of an arrival time at each point on a route in a user-friendly manner.

Method for displaying traffic information and navigation system

The invention relates to a method for generating traffic information to be used in a car navigation system, comprising the steps of acquiring traffic information data including information relating to a travel time of links making up a road on a map and for acquiring map data relating to the link, the map data comprising at least information on a road type of the link and checking if a volume of the traffic information data available in is sufficient for performing a statistical estimate for the travel time. In order to enhance the traffic information generated, it is proposed to use the steps of checking if the volume of traffic information data relating to links located in a target area is sufficient and adapting a size of the target area depending on the amount of available traffic information data.

Traffic information providing system and method for generating traffic information

A traffic state predicting apparatus, which predicts congestion states of parts of a link based on limited information (the travel time for the link), comprises storage means that stores link data including a link length of each link forming part of a road on a map and parameters including, for each link, a smooth traffic speed indicting being smooth, a congested traffic speed indicating being congested, and a congestion reference position which is a reference position for a congested section; means that acquires a predicted travel time for the link; and congestion degree classified section calculating means that obtains sections classified according to their level of congestion in the link with use of the predicted travel time and the parameters.

Traffic state predicting apparatus

There is provided a method and a device for accurately estimating traffic information of a link having no traffic information even if different types of roads are mixed. The device finds a parameter characterizing a damping curve of a quantity of change of relative speed based on stored traffic information for links on a city center side on a minimum-time cost route connecting the city center and suburbs, finds a quantity of change of relative speed of the link having no observed traffic information and estimates its traffic information based on the damping curve. The device also calculates a ratio of quantities of change of relative speed of two links whose road types change as a speed change similarity ratio and estimates traffic information of the link of a second road type from known traffic information of the link of a first road type by using that ratio.

Method of estimation of traffic information, device of estimation of traffic information and car navigation device

Growing community of inventors

Tokyo, Japan

Kenichiro Yamane