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公开(公告)号：US20190148977A1
公开(公告)日：2019-05-16
申请号：US16099448
申请日：2017-03-21
Applicant: Hitachi, Ltd.
Inventor： Eisuke KURODA , Toshiyuki MIYAKE , Nao SAITO , Masahiro YATSU , Taichirou KAWAHARA
Abstract: The voltage and reactive power monitoring/control method includes: measurement data for the power system and data for the system equipment of the power system are used to calculate the system status for the power system at the time of measurement; data for a status estimation calculation result and predicted data for the power generation and load of the power system are used to predictively calculate a system status at a future time from the time of the power system measurement; a fluctuation component is obtained for the predicted value of the data obtained from the power system; the reactive power required to suppress the fluctuation component is obtained, as a required reactive power amount; a reactive power distribution subject is selected from a plurality of pieces of control subject equipment; an output distribution calculation is performed for the required reactive power amount for the selected control subject equipment.
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公开(公告)号：US20180054059A1
公开(公告)日：2018-02-22
申请号：US15555571
申请日：2016-03-04
Applicant: HITACHI, LTD.
Inventor： Jun YAMAZAKI , Osamu TOMOBE , Eisuke KURODA , Akira TSUBOTA , Sumito TOBE , Masahiro YATSU
CPC classification number: H02J3/24 , G01R31/40 , G05B9/02 , H02J3/38 , H02J3/381 , H02J3/382 , H02J3/383 , H02J13/00 , H02J13/0006 , Y02E10/563 , Y02E40/72 , Y04S10/12 , Y04S10/123
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.
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公开(公告)号：US20230420937A1
公开(公告)日：2023-12-28
申请号：US18038123
申请日：2021-07-19
Applicant: Hitachi, Ltd.
Inventor： Eisuke KURODA , Kunihiko TSUNEDOMI , Daiki NISHIMURA , Shinya OHARA , Yasuyuki TADA
CPC classification number: H02J3/003 , H02J3/004 , H02J3/0012 , H02J3/381 , H02J2203/10 , H02J2203/20 , H02J2300/20
Abstract: A power system operation plan creation assistance device and method capable of maintaining or improving system stability or economy includes an optimization target snapshot power flow determination unit that uses one or more pieces of foundational information to determine an optimization target snapshot power flow. The foundational information includes a power generation plan, a total demand prediction, a sales plan, a renewable energy prediction, a work stoppage plan, system data, and a setting value. A system manipulation variable candidate extraction unit uses the one or more pieces of foundational information and the optimization target snapshot power flow to extract a candidate for a variable for a variable manipulating the system. An optimal system configuration calculation unit uses the one or more pieces of foundational information and the system manipulation variable candidate to calculate an optimal system configuration.
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公开(公告)号：US20200273120A1
公开(公告)日：2020-08-27
申请号：US16334401
申请日：2017-02-24
Applicant: Hitachi, Ltd.
Inventor： Kenta KIRIHARA , Eisuke KURODA , Nao SAITO , Hiroo HORII , Masahiro YATSU
Abstract: In order to provide a power grid decision-making support device and method which are capable of providing operator decision-making support, and quickly presenting control candidates, and a system which applies the same, one representative embodiment of the present invention provides a power grid decision-making support device characterized by comprising: a control candidate learning unit for deriving, by learning, a plurality of control candidate models for stabilizing a power grid; a control candidate extraction unit for extracting, from the plurality of control candidate models derived by the control candidate learning unit, control candidates using power grid measurement data and extraction parameters; a control candidate evaluation unit for evaluating the control candidates using a power grid model and the control candidates; and an information presentation unit for presenting information about the evaluation results and the control candidates.
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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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Patent Agency Ranking
6.发明申请公开(公告)号：US20180351361A1
公开(公告)日：2018-12-06
申请号：US15777433
申请日：2016-10-25
Applicant: Hitachi, Ltd.
Inventor： Toshiyuki MIYAKE , Eisuke KURODA , Masahiro YATSU
Abstract: There is provided a voltage/reactive power control device, method, and a voltage/reactive power control system that allow a proper control even with a control delay or in a situation where the system conditions at the time of setting the voltage reference value may not be always reproduced. A voltage/reactive power control system is applied to a power system in which a monitoring point is set in a local system divided as appropriate from the power system and the local system includes a voltage/reactive power control device capable of adjusting voltage and reactive power at the monitoring point. The voltage/reactive power control system includes: a central control unit that sets a control target value of the voltage and reactive power at the monitoring point in the local system based on optimal power flow calculation using total system data on the power system, generates a correction function to correct the control target value in accordance with a change in state of the power system relating to the monitoring point by using past history information on the states of the power system, and outputs the control target value and at least one or more correction functions; a local control apparatus that, when the control target value is different from system data on the local system, uses the correction function to calculate a controlled variable for the voltage/reactive power control device necessary to attain the control target value; and a device control apparatus that controls the voltage/reactive power control device in accordance with the controlled variable from the local control apparatus.
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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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公开(公告)号：US20240305100A1
公开(公告)日：2024-09-12
申请号：US18271052
申请日：2021-12-16
Applicant: Hitachi, Ltd.
Inventor： Yuki TSUJII , Eisuke KURODA
Abstract: A power supply-demand adjustment device performs output distribution to M adjustment power supplies among N adjustment power supplies in a system, based on adjustment information and supply-demand imbalance. The adjustment information includes output change rate, a distributed output, and an output limit value for each adjustment power supply. For each period, the output distribution satisfying the following (x) and (y) is performed; where (x) is the distribution of an output to the adjustment power supply in an increasing direction in ascending or descending order of the adjustment cost; and (y) is regardless of whether an output direction is the increasing or decreasing direction, an output to be distributed to the adjustment power supply in the period is in a reducing direction with respect to reduction in a difference between the distributed output to the adjustment power supply and the output limit value of the adjustment power supply.
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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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