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1. 发明授权

US09606554B2 Voltage adjustment device for power distribution system, voltage adjusting method, and power control system 有权
公开(公告)号：US09606554B2
公开(公告)日：2017-03-28
申请号：US14418236
申请日：2013-07-24
申请人： Hitachi, Ltd. , Tohoku Electric Power Co., Inc. , Tohoku Electric Manufacturing Co., Ltd.
发明人： Masahiro Watanabe , Ryo Egashira , Kenichiro Yamane , Katsuhiro Matsuda , Takafumi Futakami , Toshiyuki Seto , Jun Murakoshi
IPC分类号： G05F1/14 , H02J3/18
CPC分类号： G05F1/14 , H02J3/1878 , Y02E40/12 , Y02E40/30
摘要： A voltage adjustment device, a voltage adjusting method and a power control system for a distribution system are provided, in which the voltage adjustment device and a static var compensator are appropriately operated in a coordinated manner and the sustention of voltage and the enhancement of the operation efficiency are attained. A voltage adjustment device for a distribution system is installed in the distribution system including a static var compensator on an end side and controls a secondary voltage to be within a predetermined limit value by adjusting a tap position. The voltage adjustment device includes a first unit configured to estimate the secondary voltage; a second unit configured to obtain a corrected voltage by correcting the estimated secondary voltage by using a correction amount obtained from an output of the static var compensator; and a third unit configured to compare the corrected voltage with the predetermined limit value and operate the tap position when the corrected voltage deviates from the predetermined limit value.

2. 发明授权

US10211777B2 Photovoltaic power generator output estimation method and device, and power system monitoring device using same 有权
公开(公告)号：US10211777B2
公开(公告)日：2019-02-19
申请号：US15113245
申请日：2015-01-14
申请人： Hitachi, ltd. , Tohoku Electric Power Co., Inc. , Tohoku Electric Manufacturing Co., Ltd
发明人： Masahiro Watanabe , Kenichiro Yamane , Takuya Matsumoto , Masatoshi Kumagai , Tsukasa Oonishi , Ryo Egashira , Katsuhiro Matsuda , Jun Murakoshi , Tomoya Sato
IPC分类号： G01C21/00 , H02S50/00 , H02J3/38
摘要： The output of a photovoltaic power generator is estimated by estimating a solar radiation amount at a point different from solar radiation measurement points and determining an estimation error amount from solar radiation values measured at limited points. A photovoltaic power generator output estimation method estimates an output of a photovoltaic power generator based on a measured solar radiation value. The method includes a first estimation method of estimating a solar radiation amount at a photovoltaic power generator installation point from solar radiation meter installation point information, a value measured by a solar radiation meter, and photovoltaic power generator installation point information; a second estimation method of estimating the solar radiation amount at the photovoltaic power generator installation point in a manner different from that of the first estimation method; an output estimation method of estimating the output of the photovoltaic power generator from an estimated solar radiation amount and a rated capacity of the photovoltaic power generator; and an error estimation method of determining an estimation error of a photovoltaic power generator output from a difference between the first and second estimation methods.

3. 发明申请

US20150286227A1 VOLTAGE ADJUSTMENT DEVICE FOR POWER DISTRIBUTION SYSTEM, VOLTAGE ADJUSTING METHOD, AND POWER CONTROL SYSTEM 有权
标题翻译：用于配电系统的电压调节装置，电压调节方法和功率控制系统
公开(公告)号：US20150286227A1
公开(公告)日：2015-10-08
申请号：US14418236
申请日：2013-07-24
申请人： Hitachi, Ltd. , Tohoku Electric Power Co., Inc. , Tohoku Electric Manufacturing Co., Ltd.
发明人： Masahiro Watanabe , Ryo Egashira , Kenichiro Yamane , Katsuhiro Matsuda , Takafumi Futakami , Toshiyuki Seto , Jun Murakoshi
IPC分类号： G05F1/14
CPC分类号： G05F1/14 , H02J3/1878 , Y02E40/12 , Y02E40/30
摘要： A voltage adjustment device, a voltage adjusting method and a power control system for a distribution system are provided, in which the voltage adjustment device and a static var compensator are appropriately operated in a coordinated manner and the sustention of voltage and the enhancement of the operation efficiency are attained. A voltage adjustment device for a distribution system is installed in the distribution system including a static var compensator on an end side and controls a secondary voltage to be within a predetermined limit value by adjusting a tap position. The voltage adjustment device includes a first unit configured to estimate the secondary voltage; a second unit configured to obtain a corrected voltage by correcting the estimated secondary voltage by using a correction amount obtained from an output of the static var compensator; and a third unit configured to compare the corrected voltage with the predetermined limit value and operate the tap position when the corrected voltage deviates from the predetermined limit value.
摘要翻译：提供一种用于配电系统的电压调节装置，电压调节方法和功率控制系统，其中电压调节装置和静态无功补偿器以协调的方式适当地运行并且电压的维持和操作的增强效率达到。用于分配系统的电压调节装置安装在分配系统中，包括端侧的静态无功补偿器，并通过调节分接头位置来控制次级电压在预定极限值内。电压调节装置包括：第一单元，被配置为估计次级电压; 第二单元，被配置为通过使用从静态无功补偿器的输出获得的校正量来校正所估计的次级电压来获得校正电压; 以及第三单元，其被配置为将所述校正电压与所述预定极限值进行比较，并且当所述校正电压偏离所述预定极限值时，操作所述分接头位置。

4. 发明授权

US10361560B2 Power system control instruction device and method for controlling a voltage of a power system 有权
公开(公告)号：US10361560B2
公开(公告)日：2019-07-23
申请号：US15129721
申请日：2014-03-31
申请人： Hitachi, Ltd.
发明人： Shota Omi , Masatoshi Kumagai , Kenichiro Yamane , Masahiro Watanabe
IPC分类号： H02J3/12 , H02J13/00 , G05B17/02
摘要： A power system control instruction device performing a control instruction to the control device that controls the power system on the basis of a measured value transmitted from a sensor measuring a state value of the power system and a method for performing such a control instruction are provided. The device obtains a centralized control amount using a measured value of the sensor such that a system voltage meets a predetermined control purpose, and creates a distributed control model using the measured value and the centralized control amount. The device then determines whether or not a voltage deviation from the voltage appropriate range occurs when the control device performs control on the basis of the distributed control model, and re-creates the distributed control model when the voltage deviation occurs, and transmits the distributed control model that is re-created to the control device.

5. 发明授权

US10045375B2 Multi-hop radio communication method 有权
公开(公告)号：US10045375B2
公开(公告)日：2018-08-07
申请号：US15111917
申请日：2014-02-05
申请人： Hitachi, Ltd.
发明人： Yasutaka Serizawa , Masayuki Miyazaki , Kenichiro Yamane , Tatsuki Inuduka , Ryo Nakano , Satoru Harada
IPC分类号： H04W74/04 , H04W4/06 , H04W84/18 , H04W88/08
摘要： In a multi-hop radio communication network including a base station (a radio station connected to a management server), each radio station in the network is given a data transmission opportunity in turn according to a predetermined transmission order, and transmits data via broadcast or multicast upon occurrence of transmission timing. The radio station having received the data adds data of the radio station to the received data and then forwards the packet via broadcast or multicast when it is the radio station's turn for transmission.

6. 发明申请

US20150212138A1 METHOD FOR DETECTING OPEN-CIRCUIT FAULTS IN ELECTRIC POWER DISTRIBUTION SYSTEM, AND POWER DISTRIBUTION FACILITIES MANAGEMENT SYSTEM 审中-公开
标题翻译：检测电力分配系统中的开路故障的方法和功率分配设备管理系统
公开(公告)号：US20150212138A1
公开(公告)日：2015-07-30
申请号：US14419482
申请日：2013-07-22
申请人： Hitachi, Ltd.
发明人： Kazutoshi Tsuchiya , Kenichiro Yamane , Masahiro Adachi , Mitsugu Daino
IPC分类号： G01R31/02 , H02J13/00 , G01R21/133
CPC分类号： G01R31/02 , G01R21/133 , G01R31/08 , G01R31/085 , H02J13/00
摘要： An open-circuit fault in an electric power distribution line is detected using metering devices each having a communication function and each placed on a power consumer's circuit connected to an electric power distribution system, and a location of the open circuit is identified. An electric power distribution facilities management system obtains, from the power distribution system to which are connected consumers each including a sensor provided with a communication function, meter-reading data within each of the sensors having a communication function, via a communication system. The system includes a number-of-unavailable-data calculation unit that calculates a number of unavailable meter-reading data from the sensors having a communication function, an on-fault number-of-unavailable-data calculation unit that calculates the number of sensors each having a communication function and each placed in the power distribution system, and a fault determining unit that determines whether an open-circuit fault is occurring in the power distribution system.
摘要翻译：使用各自具有通信功能的计量装置来检测配电线路中的开路故障，并且每个放置在连接到配电系统的电力用户的电路上，并且识别开路的位置。电力配送设备管理系统经由通信系统从具有通信功能的传感器的连接消费者的配电系统获得具有通信功能的每个传感器内的读表数据。该系统包括一个不可用数据计算单元，其计算来自具有通信功能的传感器的不可用的读表数据的数量，故障数不可数数据计算单元，其计算传感器的数量每个具有通信功能并且各自放置在配电系统中，以及故障确定单元，其确定在配电系统中是否发生开路故障。

7. 发明授权

US10389127B2 Power system stabilization system 有权
公开(公告)号：US10389127B2
公开(公告)日：2019-08-20
申请号：US15554273
申请日：2015-03-09
申请人： Hitachi, Ltd.
发明人： Masatoshi Kumagai , Yukihiro Takatani , Shota Omi , Kenichiro Yamane
IPC分类号： H02J3/18 , H02J3/24 , G06Q50/06 , H02J13/00
摘要： A system stabilization system (101) is provided with: at least one of a power flow state database (DB2) and a system configuration database (DB3); a device state database (DB1) in which the device states of a stabilizing device are recorded; a stabilizing effect index calculation function (204) for indexing the stabilizing effect of the stabilizing device on the basis of a device state and one or both of a power flow state and a system configuration; and a display means for displaying or outputting a stabilizing effect index obtained by the stabilizing effect index calculation function, in contrast with contrasted elements included in the device state, the power flow state, and the system configuration.

8. 发明授权

US11342750B2 Power demand/supply adjustment power procurement plan support device and method, and power demand/supply adjustment power procurement plan support system 有权
公开(公告)号：US11342750B2
公开(公告)日：2022-05-24
申请号：US16476309
申请日：2017-10-11
申请人： Hitachi, Ltd.
发明人： Toshiyuki Miyake , Kenichiro Yamane , Masahiro Yatsu , Taichiro Kawahara , Toshiyuki Sawa
IPC分类号： H02J3/24 , H02J3/28 , H02J3/46
摘要： A power demand/supply adjustment power procurement plan support device supports a power system through a power transaction in the power market and has an added power transmission capacity analysis means and a target power transmittable capacity determination means. The added power transmission capacity analysis means obtains: actual power supply data including a power supply having supplied power to the power system and the actual value of a power supply amount; an actual power system stabilization data including a power supply performing power supply restriction for power system stabilization, an electric control amount or a customer facility performing a load restriction, and the actual value of a load control amount; and an actual power demand/supply adjustment power procurement data including a procurement amount of the power demand/supply adjustment power of a power supply participating in the power market and the actual value of the total procurement cost.

9. 发明授权

US09780563B2 Power system control system and distributed controller used in same 有权
公开(公告)号：US09780563B2
公开(公告)日：2017-10-03
申请号：US14768938
申请日：2013-02-28
申请人： Hitachi, Ltd.
发明人： Masatoshi Kumagai , Shota Omi , Kenichiro Yamane , Yasushi Harada , Masahiro Watanabe , Yasuo Sato , Yasushi Tomita
IPC分类号： H02J3/16 , G01R19/25 , H02J3/00
CPC分类号： H02J3/16 , G01R19/25 , H02J2003/007 , Y02E40/34 , Y02E60/76 , Y04S40/22
摘要： 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.

10. 发明授权

US10860000B2 Power system stabilization system and method 有权
公开(公告)号：US10860000B2
公开(公告)日：2020-12-08
申请号：US15566461
申请日：2015-04-24
申请人： Hitachi, Ltd.
发明人： Shota Omi , Masatoshi Kumagai , Kenichiro Yamane
IPC分类号： G05B19/4093 , H02J3/24 , G05B19/418 , G05F1/66 , H02J3/18 , H02P9/10 , H02J3/38
摘要： It is possible by means of a system simulation device to extract a disturbance mode wherein multiple accident conditions are assumed and to determine control parameters, but when the number of accident conditions increases, a threshold value pertaining to a divergence constant deviates prior to an update period, with the result that an uncontrollable disturbance mode appears. In order to solve this problem, the present invention is a power system stabilization system for determining control parameters for a control device connected to a power system, the power system stabilization system equipped with: a disturbance mode prediction unit for predicting a disturbance mode of a power system on the basis of operation information and an assumed system configuration for the power system; a post-control parameter update period prediction unit for predicting an update period for a post-control parameter in post-control after a disturbance has occurred; a threshold value setting unit for setting a threshold value pertaining to a divergence constant on the basis of the disturbance mode and the update period for the post-control parameter; and a control parameter determination unit for determining a control parameter of the control device on the basis of the disturbance mode and the threshold value.

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