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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：US20190056436A1
公开(公告)日：2019-02-21
申请号：US16075401
申请日：2016-05-13
Applicant: Hitachi, Ltd.
Inventor： Norifumi NISHIKAWA , Jun YAMAZAKI , Mika TAKATA
IPC: G01R19/25
CPC classification number: G01R19/2513 , Y02E60/728 , Y04S10/265
Abstract: Example implementations described herein are directed to detection of historical anomalous events that are similar to currently occurring events in a transmission power system based on phasor management unit (PMU) data to provide information to grid operators with online decision support. From the high-resolution time synchronized PMU data, the historical events can be quickly retrieved and compared to the currently occurring event so that operators can be provided with remedy actions that were attempted in response to the historical events. Utilization of PMU information for such decision support may compliment operation practices relying on supervisory control and data acquisition (SCADA) measurements by allowing a much fast response to the currently occurring event. Accurate identification of similar, historical events can advise grid operators of the cause of disturbances and provide ideas for response. Implementations of the proposed technology may improve the resilience and reliability of the transmission power systems.
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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：US20210248481A1
公开(公告)日：2021-08-12
申请号：US16951088
申请日：2020-11-18
Applicant: Hitachi, Ltd.
Inventor： Tohru WATANABE , Masato UTSUMI , Ikuo SHIGEMORI , Tetsu ITO , Jun YAMAZAKI , Daisuke HAMABA , Hiroshi IIMURA
Abstract: An object of the invention is to provide a data processing system that can appropriately determine data to be used for identification of a prediction model. The data processing system that performs prediction using a prediction model, includes: a selection unit that selects data to be used for identification of a prediction model from a storage unit that stores data; and a processing unit that identifies the prediction model by using the data selected by the selection unit. The selection unit selects, from the storage unit, predetermined first data, and second data of a type and/or condition different from the first data, based on a branch condition of structure data of a structural prediction model.
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公开(公告)号：US20190033351A1
公开(公告)日：2019-01-31
申请号：US16081853
申请日：2016-10-28
Applicant: HITACHI, LTD.
Inventor： Mika TAKATA , Norifumi NISHIKAWA , Jun YAMAZAKI
Abstract: Example implementations described herein are directed to detecting similarity between anomalous events that are currently occurring or have previously occurred transmission power system based on phasor management unit (PMU) data to provide information to grid operators with online decision support. From the high-resolution time synchronized PMU data, the events can be quickly retrieved and compared so that operators can be provided with remedy actions that were attempted in response to the previous events. Utilization of PMU information for such decision support may compliment operation practices relying on supervisory control and data acquisition (SCADA) measurements by allowing a much fast response to the currently occurring event. Accurate identification of similar, historical events can advise grid operators of the cause of disturbances and provide ideas for response. Implementations of the proposed technology may improve the resilience and reliability of the transmission power systems.
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Patent Agency Ranking
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：US20210083475A1
公开(公告)日：2021-03-18
申请号：US16618816
申请日：2018-04-10
Applicant: Hitachi, Ltd.
Inventor： Kenta KIRIHARA , Sumito TOBE , Masahiro YATSU , Hiroo HORII , Jun YAMAZAKI
IPC: H02J3/00
Abstract: A system operation support device in a power system stabilizes the power system and has a predicted accident time system state calculation unit that receives measured data, a system topology, and a target accident type as inputs, and calculates a system state and a predicted accident time system state. A control menu calculation unit receives the results of the predicted accident time system state as inputs and calculates a control menu. A restoration control means calculation unit receives the result of the control menu calculation as an input and calculates a restoration control procedure. A restoration prevention control procedure calculation unit receives the result of the restoration control and a target restoration time parameter as inputs and performs a power generator output adjustment time simulation, a necessary prevention control amount calculation, and a prevention control procedure calculation. A display unit displays the restoration control procedure and the prevention control procedure.
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公开(公告)号：US20170146585A1
公开(公告)日：2017-05-25
申请号：US14952533
申请日：2015-11-25
Applicant: HITACHI, LTD.
Inventor： Alex WANG , Hsiu-Khuern TANG , Bo YANG , Jun YAMAZAKI
CPC classification number: G01R31/086 , G01P3/00 , G01P3/50 , G01P7/00 , G01R19/2513 , G01R23/02 , G01R29/18 , G01R31/08 , G01R31/085 , G01R31/088 , G01R31/11 , G01R31/44 , Y02E60/728 , Y04S10/265
Abstract: Example implementations described herein are directed to detection of anomalous events and locations on the transmission power system using phasor management unit (PMU) data, which provides information to grid operators for online decision support. From the high-resolution time synchronized PMU data, the transient abnormal events can be monitored and locations can be disclosed to operators for remedy actions. Utilization of PMU information for such decision support compliments operation practices relying on supervisory control and data acquisition (SCADA) measurements at much lower data resolution. Accurate identification of event locations can further advise grid operators the root cause of disturbances and illuminate possible cascading failures. Implementations of the proposed technology may improve the resilience and reliability of the transmission power systems.
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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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10.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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