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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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2.发明申请DISTRIBUTED ENERGY RESOURCES CONTROL APPARATUS AND DISTRIBUTED ENERGY RESOURCES CONTROL METHOD 有权分布式能源资源控制装置和分布式能源资源控制方法公开(公告)号：US20130258730A1
公开(公告)日：2013-10-03
申请号：US13770177
申请日：2013-02-19
Applicant: HITACHI, LTD.
Inventor： Yasuo SATO , Takafumi EBARA , Masahiro WATANABE , Tsukasa ONISHI
IPC: H02M7/00
CPC classification number: H02M7/00 , H02J3/381 , H02J2003/388 , H02M1/4225 , H02M2001/385 , Y02B70/126
Abstract: A distributed energy resources control apparatus for controlling power from a distributed energy resource in a system section separable from a power system includes a detecting unit, a receiving unit, and a control unit. The detecting unit detects a fault of the power system. The receiving unit receives a signal indicating authorization for the distributed energy resource to perform independent operation as linking with the system section, when the system section is separated from the power system. The control unit controls a power converter converting power from the distributed energy resource and outputting to the system section, based on measurement results of a voltage and a frequency of the system section, when the fault is detected and the signal is received.
Abstract translation: 用于控制与电力系统分离的系统部分中的分布式能源的电力的分布式能源控制装置包括检测单元，接收单元和控制单元。 检测单元检测电力系统的故障。 当系统部分与电力系统分离时，接收单元接收指示分配能量资源的授权以执行独立操作的信号，作为与系统部分的链接。 当检测到故障并接收信号时，控制单元根据系统部分的电压和频率的测量结果，控制从分布式能量转换功率的功率转换器并将其输出到系统部分。
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公开(公告)号：US20170353033A1
公开(公告)日：2017-12-07
申请号：US15537986
申请日：2015-11-25
Applicant: HITACHI, LTD. , CHUBU ELECTRIC POWER CO., INC.
Inventor： Eisuke KURODA , Yasuo SATO , Taichirou KAWAHARA , Kouichi HARA , Kouichi YOKOI , Keisuke KATSURAGI , Toshihito ZASHIBO , Takumi MATSUBARA , Makoto KUWABARA
IPC: H02J3/24 , G05B19/042 , H02J3/00
CPC classification number: H02J3/24 , G05B19/042 , G05B2219/2639 , H02J2003/001 , H02P9/105
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.
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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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Patent Agency Ranking
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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6.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：US20160013648A1
公开(公告)日：2016-01-14
申请号：US14768938
申请日：2013-02-28
Applicant: HITACHI, LTD.
Inventor： Masatoshi KUMAGAI , Shota OMI , Kenichiro YAMANE , Yasushi HARADA , Masahiro WATANABE , Yasuo SATO , Yasushi TOMITA
Abstract: 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.
Abstract translation: 分布式控制器收集自身节点和另一节点中的电压和电流的测量值数据; 使用自身节点的测量电压和电流以及另一节点的测量电压和电流作为输入数据，估计电压或电流作为关于测量值数据不可能的另一个节点的电力系统的状态量 收集并输出估计值; 使用测量数据，从状态估计功能单元输出的估计值和为每个节点设置的电压目标值，基于电压变化量输出用于电压控制器的控制命令，分配给电压控制装置 节点包括自己的节点。 电力系统中的电压通过电压控制装置的电压变化量的叠加来控制。
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公开(公告)号：US20150084432A1
公开(公告)日：2015-03-26
申请号：US14461974
申请日：2014-08-18
Applicant: Hitachi, Ltd.
Inventor： Jun YAMAZAKI , Yasuo SATO , Toshiyuki SAWA , Taichiro KAWAHARA
IPC: H02J4/00
CPC classification number: H02J3/382 , H02J3/24 , H02J2003/007 , Y02E40/76 , Y02E60/76 , Y04S10/545 , Y04S40/22 , Y10T307/74
Abstract: A power system management device which manages a system state in a power system includes a system state candidate calculation unit for calculating state amounts of the system state based on an objective function from system characteristic information indicating characteristic information of a system structure, an inter-state distance calculation unit for calculating an inter-state distance representing a similarity of values between state amounts of the system state calculated by the system state candidate calculation unit, and a variability evaluation value calculation unit for calculating a variability evaluation value in which a variability of the system state is evaluated, based on an objective function value calculated from the state amount of the system state calculated by the system state candidate calculation unit and the inter-state distance calculated by the inter-state distance calculation unit. The system state is selected based on the calculated variability evaluation value.
Abstract translation: 管理电力系统中的系统状态的电力系统管理装置包括：系统状态候补计算部，其根据表示系统结构的特征信息的系统特性信息，基于目标函数计算系统状态的状态量; 距离计算单元，用于计算表示由系统状态候补计算单元计算的系统状态的状态量之间的值的相似度的状态间距离;以及变异性评估值计算单元，用于计算变异性评估值，其中， 基于由系统状态候选计算单元计算的系统状态的状态量和由状态间距离计算单元计算的状态间距离计算出的目标函数值来评估系统状态。 基于计算的变异性评估值来选择系统状态。
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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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