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公开(公告)号：US20170278200A1
公开(公告)日：2017-09-28
申请号：US15507397
申请日：2015-05-28
Applicant: HITACHI, LTD.
Inventor： Jun YAMAZAKI , Masahiro YATSU , Sumito TOBE , Yasuo SATO , Osamu TOMOBE , Eisuke KURODA
CPC classification number: G06Q50/06 , H02J3/24 , H02J13/00 , H02J13/0079 , Y04S10/60
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.
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公开(公告)号：US20170045558A1
公开(公告)日：2017-02-16
申请号：US15306226
申请日：2015-04-06
Applicant: Hitachi, Ltd.
Inventor： Eisuke KURODA , Yasuo SATO , Osamu TOMOBE , Jun YAMAZAKI , Masahiro YATSU , Kouichi HARA , Haruki MIYOSHI
CPC classification number: G01R19/2513 , G01R19/0084 , H02J3/00 , H02J3/24 , H02J13/00
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. Hence the present invention provides a voltage stability monitoring device, which monitors voltage stability of a power system, including an assumed change scenario calculation unit which produces a plurality of assumed change scenarios indicating a scenario of a change that is assumed based on at least one of a system configuration of the power system and a change of a tide state; a voltage stability calculation unit which calculates the voltage stability using the assumed change scenario; a voltage stability margin calculation unit which calculates a voltage stability margin indicating margin degree of the voltage stability, based on the voltage stability; an each scenario severity ranking calculation unit which selects an assumed change scenario with high severity of the voltage stability for each assumed change scenario, based on the voltage stability margin; a vulnerable bus calculation unit which calculates which of buses in the power system is a vulnerable bus that decreases voltage stability, based on the assumed change scenario which is selected; and a monitoring location change unit which changes a monitoring target of the voltage stability, based on information of the vulnerable bus.
Abstract translation: 在电力系统的稳定性监视计算中，目的是通过动态地改变当前或将来的电压稳定性恶化的总线来精确地监视电流或将来的电压稳定性的恶化。 因此，本发明提供了一种电压稳定性监视装置，其监测电力系统的电压稳定性，包括假设变化情景计算单元，该假设变化情景计算单元产生指示基于以下中的至少一个 电力系统的系统配置和潮汐状态的改变; 电压稳定性计算单元，其使用所述假定的变化情况来计算电压稳定性; 电压稳定裕度计算单元，其基于电压稳定性计算表示电压稳定性的余量的电压稳定裕度; 每个情景严重度排序计算单元，基于所述电压稳定性裕度，针对每个假定的变化情景选择具有高严重性的电压稳定性的假定变化情景; 弱电总线计算单元，基于所选择的假设变化情况，计算电力系统中的哪些总线是降低电压稳定性的易损性总线; 以及基于所述易损性总线的信息来改变所述电压稳定性的监视对象的监视位置变更部。
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公开(公告)号：US20180262010A1
公开(公告)日：2018-09-13
申请号：US15571172
申请日：2016-04-15
Applicant: Hitachi, Ltd.
Inventor： Daichi KATO , Eisuke KURODA , Osamu TOMOBE , Masahiro YATSU
CPC classification number: H02J3/383 , G05B19/00 , H02J3/00 , H02J3/24 , H02J3/28 , H02J3/38 , H02J3/386 , H02J3/46
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.
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公开(公告)号：US20170146574A1
公开(公告)日：2017-05-25
申请号：US15316221
申请日：2015-05-11
Applicant: Hitachi, Ltd.
Inventor： Eisuke KURODA , Yasuo SATO , Osamu TOMOBE , Jun YAMAZAKI , Masahiro YATSU , Haruki MIYOSHI
CPC classification number: G01R19/2503 , G01R19/2513 , H02J3/06 , H02J3/16 , H02J3/382 , H02J3/383 , H02J3/386 , H02J13/0006 , Y02E10/563 , Y02E10/763 , Y02E40/34 , Y02E40/72 , Y02E60/726 , Y02E60/74 , Y04S10/123 , Y04S10/24 , Y04S10/30
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.
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公开(公告)号：US20220320869A1
公开(公告)日：2022-10-06
申请号：US17596747
申请日：2020-06-26
Applicant: Hitachi, Ltd.
Inventor： Masanori ABE , Osamu TOMOBE , Masatoshi KUMAGAI
Abstract: The objective of the present invention is to diagnose an abnormality in the amount of electricity generated by a distributed power source while restricting an increase in the number of sensors. A packet generating unit 200 generates electricity generation amount packet data D2a from electricity generation amount data D1 and identification data D6; an electricity generation feature quantity calculating unit 201 calculates electricity generation feature quantity data D3a, D3b indicating a feature quantity of the amount of electricity generated by each distributed power source, from each item of and a result output unit 203 consolidates abnormalities in the amounts of electricity generated by the distributed power sources, indicated by the determination result data D5, as abnormality diagnosis result data D7, and outputs the same to a display unit 206.
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Patent Agency Ranking
公开(公告)号：US20180152020A1
公开(公告)日：2018-05-31
申请号：US15568238
申请日：2016-03-25
Applicant: Hitachi, Ltd.
Inventor： Eisuke KURODA , Daichi KATO , Osamu TOMOBE , Haruki MIYOSHI , Shintaro UENO
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. This power system voltage reactive power monitoring control device, which supplies transmission data to individual devices capable of adjusting the voltage and the reactive power of a power system, is characterized in that one or more indices indicating the stability of the power system are used to determine one or more target value restrictions, information about the target value is obtained from the target value restrictions, transmission data containing information about the target value is supplied to the individual devices, and the voltage and reactive power at the relevant installation site are adjusted by the individual devices.
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公开(公告)号：US20170097271A1
公开(公告)日：2017-04-06
申请号：US15127822
申请日：2014-09-19
Applicant: Hitachi, Ltd.
Inventor： Jun YAMAZAKI , Masahiro YATSU , Sumito TOBE , Yasuo SATO , Osamu TOMOBE , Eisuke KURODA
CPC classification number: G01M1/14 , G01N29/11 , G01N29/12 , G01N29/4445 , G01N29/48 , H02J3/1821 , H02J3/383 , H02J3/386 , H02J13/001 , H02J13/0086 , H02J50/20 , H02S50/00 , H02S50/10 , Y02E10/563 , Y02E10/763 , Y02E40/30 , Y02E40/72 , Y04S10/123 , Y04S10/40
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.
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8.发明申请POWER SYSTEM MONITORING APPARATUS, POWER SYSTEM CONTROL APPARATUS, AND POWER SYSTEM MONITORING METHOD 审中-公开电力系统监控装置，电力系统控制装置和电力系统监测方法公开(公告)号：US20160359363A1
公开(公告)日：2016-12-08
申请号：US15116524
申请日：2014-09-19
Applicant: HITACHI, LTD.
Inventor： Yasuo SATO , Masahiro YATSU , Kouichi HARA , Eisuke KURODA , Osamu TOMOBE , Jun YAMAZAKI
CPC classification number: H02J13/0017 , G05B17/02 , H02J3/382 , H02J3/46 , H02J13/0006 , Y02E60/74 , Y04S10/30
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 translation: 在基于现有（N-1）可靠性标准的管理中，可以在可再生能源增加的电力系统中起草适当的行政计划。 因此，根据本发明，监视电力系统的电力系统监视装置包括：输入单元，输入可假设的系统故障数据，所述系统故障数据包括电力系统的每个假设故障的发生频率和可假设的输出变化数据， 连接到电力系统的每个发电机的每个可变输出变化; 以及输出单元，其基于可假定故障的发生频率和可假设的输出变化产生将可假定故障和可假设输出变化的事件组合的条件，并输出每个条件的控制计划。
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公开(公告)号：US20250005228A1
公开(公告)日：2025-01-02
申请号：US18698810
申请日：2022-10-06
Applicant: HITACHI, LTD.
Inventor： Tetsushi ONO , Masashi YAMAMOTO , Osamu TOMOBE , Tsutomu KAWAMURA
IPC: G06F30/20
Abstract: An off-grid area selection device that selects an area in which an off-grid in a power distribution system having a plurality of switches arranged therein can be constructed, and an off-grid area selection method executed in the off-grid area selection device are configured to select an area in which an off-grid in the power distribution system can be constructed based on each piece of information regarding a load capacity and a power supply facility for each switch section and facility information of the power distribution system, simulate system stability in the selected area, and determine whether or not the area can comply with a system operation constraint of the power distribution system.
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公开(公告)号：US20240171002A1
公开(公告)日：2024-05-23
申请号：US18284169
申请日：2022-03-14
Applicant: Hitachi, Ltd.
Inventor： Masashi YAMAMOTO , Osamu TOMOBE , Tsutomu KAWAMURA , Mingyu JO
CPC classification number: H02J13/00002 , H02J3/003
Abstract: An independent operation system configuring device includes a system configuration plan creation unit that creates a system configuration plan, and an independent operation propriety determination unit that determines propriety of independent operation for each system configuration plan created by the system configuration plan creation unit. This configuration enables selecting a system configuration plan having a maximum load capacity among system configuration plans that allow independent operation.
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