公开(公告)号：US20150286227A1

公开(公告)日：2015-10-08

申请号：US14418236

申请日：2013-07-24

Applicant: Hitachi, Ltd. ,  Tohoku Electric Power Co., Inc. ,  Tohoku Electric Manufacturing Co., Ltd.

Inventor： Masahiro Watanabe ,  Ryo Egashira ,  Kenichiro Yamane ,  Katsuhiro Matsuda ,  Takafumi Futakami ,  Toshiyuki Seto ,  Jun Murakoshi

IPC: G05F1/14

CPC classification number: G05F1/14 ,  H02J3/1878 ,  Y02E40/12 ,  Y02E40/30

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US10211777B2

公开(公告)日：2019-02-19

申请号：US15113245

申请日：2015-01-14

Applicant: Hitachi, ltd. ,  Tohoku Electric Power Co., Inc. ,  Tohoku Electric Manufacturing Co., Ltd

Inventor： Masahiro Watanabe ,  Kenichiro Yamane ,  Takuya Matsumoto ,  Masatoshi Kumagai ,  Tsukasa Oonishi ,  Ryo Egashira ,  Katsuhiro Matsuda ,  Jun Murakoshi ,  Tomoya Sato

IPC: G01C21/00 ,  H02S50/00 ,  H02J3/38

Abstract: 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.

公开(公告)号：US20150293264A1

公开(公告)日：2015-10-15

申请号：US14443002

申请日：2013-11-14

Applicant: TOHOKU ELECTRIC POWER CO., INC. ,  NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY ,  TOHOKU UNIVERSITY

Inventor： Noriyasu Honma ,  Yasuji Hongo ,  Yukihiro Takahashi ,  Mitsuteru Sato ,  Fuminori Tsuchiya ,  Daiki Tsurushima

IPC: G01W1/16 ,  G01R33/02

CPC classification number: G01W1/16 ,  G01R33/02

Abstract: Magnetic field measurement means measures a magnetic field generated by a lightning strike in a frequency band that includes frequencies of 200 Hz or less. Electric charge calculation means determines the electric current waveform of the lightning strike on the basis of the waveform of the magnetic field measured by the magnetic field measurement means, and integrates the electric current waveform to determine an electric charge.

Abstract translation: 磁场测量装置测量在包括200Hz或更小的频率的频带内由雷击产生的磁场。 电荷计算装置基于由磁场测量装置测量的磁场的波形确定雷电的电流波形，并且积分电流波形以确定电荷。

公开(公告)号：US09606554B2

公开(公告)日：2017-03-28

申请号：US14418236

申请日：2013-07-24

Applicant: Hitachi, Ltd. ,  Tohoku Electric Power Co., Inc. ,  Tohoku Electric Manufacturing Co., Ltd.

Inventor： Masahiro Watanabe ,  Ryo Egashira ,  Kenichiro Yamane ,  Katsuhiro Matsuda ,  Takafumi Futakami ,  Toshiyuki Seto ,  Jun Murakoshi

IPC: G05F1/14 ,  H02J3/18

CPC classification number: G05F1/14 ,  H02J3/1878 ,  Y02E40/12 ,  Y02E40/30

Abstract: 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.

公开(公告)号：US20170012580A1

公开(公告)日：2017-01-12

申请号：US15113245

申请日：2015-01-14

Applicant: HITACHI, LTD. ,  TOHOKU ELECTRIC POWER CO., INC. ,  TOHOKU ELECTRIC MANUFACTURING CO., LTD.

Inventor： Masahiro WATANABE ,  Kenichiro YAMANE ,  Takuya MATSUMOTO ,  Masatoshi KUMAGAI ,  Tsukasa OONISHI ,  Ryo EGASHIRA ,  Katsuhiro MATSUDA ,  Jun MURAKOSHI ,  Tomoya SATO

IPC: H02S50/00 ,  H02J3/38

CPC classification number: H02S50/00 ,  H02J3/383 ,  Y02E10/563

Abstract: 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.

Abstract translation: 通过估计与太阳辐射测量点不同的点处的太阳辐射量来估计光伏发电机的输出，并且从在有限的点测量的太阳辐射值确定估计误差量。 光伏发电机输出估计方法基于所测量的太阳辐射值来估计光伏发电机的输出。 该方法包括：从太阳辐射计安装点信息，太阳辐射计测量的值和光伏发电机安装点信息估计光伏发电机安装点的太阳辐射量的第一估计方法; 以与第一估计方法不同的方式估计光伏发电机安装点的太阳辐射量的第二估计方法; 从估计的太阳辐射量和光伏发电机的额定容量估计光伏发电机的输出的输出估计方法; 以及根据第一和第二估计方法之间的差确定光伏发电机输出的估计误差的误差估计方法。