Abstract: In order to maintain a system frequency within a permissible range under limitations of the output of a power source to be controlled, a calculation device pertaining to a load-frequency-controlling device of the present invention: predicts time-series data indicating the status of individual power sources in a future control period, the prediction being carried out on the basis of system model data, system data, and renewable energy data; calculates, on the basis of power source data, and for each of the power sources, at least any one of a deviation state indicating the degree to which the time-series data deviates from the limitations and/or a surplus state indicating the degree to which the time-series data shows a surplus with respect to the limitations; resolves the deviation state; and calculates the amount of adjustment in the output of each of the power sources, on the basis of the deviation state and the surplus state, under the condition that the total output of the power sources is maintained.

Abstract: The objective is to provide a power system voltage reactive power monitoring control device with which a balance between the power system voltage and the reactive power can be maintained even when, for example, the output of renewable energy varies over time due to the weather, or the power supply configuration or system configuration changes, and a power system voltage reactive power monitoring control device with which the economic efficiency can be improved.

Abstract: A system stabilization control device controls a control instrument within a power system on the basis of measurement information from a plurality of measurement points within the power system. The system stabilization control device includes an equipment information database storing information of system equipment interconnected with the power system; a control priority determining unit determining the control priority of the control instrument on the basis of the information of the system equipment; a control target determining unit determining a control target on the basis of the measurement information from the plurality of measurement points and the control priority; a destabilization time calculating unit calculating destabilization time of the power system from the measurement information from the plurality of measurement points; and a control time determining unit determining control time of the control instrument on the basis of the destabilization time and the information of the system equipment.

Abstract: A power system stabilization device for the stabilization control of a power system, includes an indicator calculation unit for calculating an acceleration index, which is an index representing the acceleration of a generator for supplying electric power to the power system, by using the generator output, which is the output of the generator, and the generator phase difference that indicates the temporal change of the phase angle of the generator output; a threshold value determining unit for determining whether or not the acceleration index exceeds a preset threshold value; and a control command unit for generating a control command for control details that constitute a correction to the stabilization control, set in advance for the threshold value, when the acceleration index exceeds the threshold value.

Abstract: A system stability monitoring device monitors the stability of a power system and is equipped with: a storage unit for storing spot information indicating the positional relationship between a plurality of measurement spots in the power system; a receiving unit for receiving time-series measurement information measured by a measuring device provided at each of the measurement spots; and a calculation unit for detecting the frequency components of the power fluctuation from the measurement information, selecting, based on the frequency components, measurement spot group candidates that are measurement spots among the plurality of measurement spots, obtaining the electrical distances between the measurement spot group candidates on the basis of the spot information, and categorizing the measurement spot group candidates into at least one measurement spot group on the basis of the electrical distances.

Abstract: A voltage stability monitoring device for monitoring the voltage stability of a system, the device including: an assumed change scenario calculation unit for predicting the output variation of a renewable energy connected to said system and calculating an assumed change time-series power flow state on the basis of said output variation; a time-series voltage stability calculation unit for calculating a node voltage change with respect to demand at each node of said system on the basis of said power flow state calculated by said assumed change scenario calculation unit and calculating a voltage stability indicating the relationship curve between said node voltage and reactive power; and a voltage stability improvement countermeasure search unit for determining a controlled device on which an assumed control is to be performed, according to said voltage stability calculated by said time-series voltage stability calculation unit.

Abstract: When vibration information calculated using measurement information is classified using a distance between measurement points which is calculated using the point information, even in a case in which a plurality of vibration modes with close vibration frequencies are present at the same time, stability determination at a high speed and a high accuracy is realized. A system stability monitoring apparatus which monitors system stability of a power system includes a measurement information collecting unit that collects measurement information of a plurality of points in the power system, a vibration analyzing unit that calculates vibration information indicating vibration of a system state in the plurality of points using the measurement information, an information storage unit that stores point information including position information of the plurality of points, and a vibration classifying unit that classifies the vibration information based on the point information.

Abstract: An object is to accurately monitor deterioration of current or future voltage stability, by dynamically changing a bus in which current or future voltage stability deteriorates, in stability monitoring calculation of a power system.

Abstract: In administration based on the existing (N?1) reliability criteria, an appropriate administration plan may be not drafted in a power system in which renewable energy increases. Accordingly, according to the invention, a power system monitoring apparatus that monitors a power system includes: an input unit that inputs assumable system breakdown data including an occurrence frequency of each assumable breakdown of the power system and assumable output change data including an occurrence frequency of each assumable output change of each generator connected to the power system; and an output unit that generates conditions by which events of the assumable breakdowns and the assumable output changes are combined based on the occurrence frequencies of the assumable breakdown and the assumable output change and outputs a control plan for each of the conditions.

Abstract: A command system of a power conditioning system of the present invention receives return pattern information including a time instance and an upper output limit, and issues a command with respect to the upper output limit of the power conditioning system, the return pattern information being for preventing the frequency of an isolated power system, which is calculated by a planning server, from causing a sharp change.

Abstract: In a power equipment control system connected, via a communication network, to a system operation server of a power system and a single or a plurality of power equipments for performing power consumption or storage with interconnecting to the power system, to regulate power demand and supply balance of the power equipment, a contribution degree is obtained by preparing a demand plan of subsequent power of said power equipment; transmitting, to said power equipment, information relevant to demand regulation request to said power equipment, received from said system operation server, based on said demand plan; receiving demand regulation result of observation information on the demand regulation performed within said power equipment, based on said demand regulation request; and performing said demand regulation by said power equipment from said demand regulation result.

Abstract: A device in a power system is controlled so that the power system becomes close to a desired system state. Provided is a system control device including a storage unit which stores target information representing a target voltage phase of a specific site in a power system and measurement information representing a voltage phase of a measurement result of the specific site, and a control unit which controls a target device associated with the power system based on a difference between the measurement information and the target information.

Abstract: A command system of a power conditioning system of the present invention receives return pattern information including a time instance and an upper output limit, and issues a command with respect to the upper output limit of the power conditioning system, the return pattern information being for preventing the frequency of an isolated power system, which is calculated by a planning server, from causing a sharp change.

Abstract: In a power equipment control system connected, via a communication network, to a system operation server of a power system and a single or a plurality of power equipments for performing power consumption or storage with interconnecting to the power system, to regulate power demand and supply balance of the power equipment, a contribution degree is obtained by preparing a demand plan of subsequent power of said power equipment; transmitting, to said power equipment, information relevant to demand regulation request to said power equipment, received from said system operation server, based on said demand plan; receiving demand regulation result of observation information on the demand regulation performed within said power equipment, based on said demand regulation request; and performing said demand regulation by said power equipment from said demand regulation result.

Abstract: A process for producing a ceramic-base sinter, comprising sintering coated ceramic particles wherein the particles are prepared for sintering by the steps of: dispersing a powder of ceramic core particles in a gaseous atmosphere to form a mixture of a gas and particles in a powder of highly dispersed core particles; charging a precursor for the coat forming substance that has been formed via the vapor phase and/or a precursor for the coat forming substance in a vapor-phase state and the mixture of the gas and the powder of highly dispersed core particles that have a predetermined dispersity according to the average diameter of the core particles in a coating start region of a coating space; coating the surfaces of the core particles with the coat forming substance by allowing the precursor to contact and/or impinge against the core particles; shaping and sintering the thus coated ceramic core particles or a mixture containing them under appropriate sintering conditions.

Abstract: A process for producing a metal-base sinter, comprising sintering coated metal particles wherein the particles are prepared for sintering by the steps of: dispersing a powder of metal core particles in a gaseous atmosphere to form a mixture of a gas and particles in a powder of highly dispersed core particles; charging a precursor for the coat forming substance that has been formed via the vapor phase and/or a precursor for the coat forming substance in a vapor-phase state and the mixture of the gas and the powder of highly dispersed core particles that have a predetermined dispersity according to the average diameter of the core particles in a coating start region of a coating space; coating the surfaces of the core particles with the coat forming substance by allowing the precursor to contact and/or impinge against the core particles; shaping and sintering the thus coated metal core particles or a mixture containing them under appropriate sintering conditions.

Abstract: The present invention provides a powder classifier using a classification rotor capable of classifying powder with high efficiency and high accuracy. The classification rotor is attached to a rotating shaft as a body and rotatably supported in a casing. Within the classification rotor, a cavity is formed from the outer edge to the center and classifying vanes are provided around the circumference. The cavity is bent downwardly near the center with the lower end connected through a fine powder passage to a fine powder outlet. The outer edge of the classification rotor is connected to a coarse powder outlet. After feeding powder from a powder supply port, the powder is rotated by the classifying vanes such that coarse powder particles are taken out from the rough outlet by centrifugal force and fine powder particles are taken out by airflow from the fine powder outlet.

Abstract: The process for producing coated particles of the present invention is applicable to a process of producing coated particles by charging powder of core particles into the coating space and permitting a coat forming substance generated via a vapor phase or being in a vapor-phase state to contact against particles of the powder, and the process is characterized by dispersing powder of core particles having an average particle diameter of not more than 10 .mu.m and a particle size distribution of ((D.sub.M /5, 5D.sub.M), .gtoreq.90%) to adjust a dispersity .beta. to at least 70%, and contacting the dispersed powder of the core particles with the coat forming substance.

Abstract: Disclosed is a fiber of an organic, inorganic or metallic material or a simple substance wherein ultrafines of an inorganic or metallic material or a simple substance having an average particle diameter of 0.005-1 .mu.m are uniformly dispersed and deposited on 8-90% of the surface in a single layer. The fiber is produced by exposing a fiber of an organic, inorganic or metallic material or a simple substance to a gaseous stream forming ultrafines of an inorganic or metallic material or a simple substance by a vapor phase process, thereby contacting said ultrafines in the gaseous stream with said fiber in a state wherein the ultrafines are still active. The treated fiber is useful as a reinforcing material for a fiber reinforced composite.

Abstract: A powder of diamond or high-pressure phase boron nitride core particles charged into a coating space as it is dispersed, and a precursor of a coat forming substance allowed to contact and/or impinge against the particles in the powder of core particles so that their surfaces are covered with the coat forming substance, thereby preparing coated diamond or high-pressure phase boron nitride particles which are subsequently sintered. The thusly produced diamond of high-pressure phase boron nitride sinter is composed of coated core particles of high performance that are superhard, uniform, dense and sintered firmly, and which have a controlled microstructure.