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1. 发明专利

JP2011169732A Method and device for locating ground fault point of distribution line 有权
标题翻译：用于定位分布线地面故障点的方法和装置
公开(公告)号：JP2011169732A
公开(公告)日：2011-09-01
申请号：JP2010033558
申请日：2010-02-18
申请人： Hitachi Ltd , Tohoku Electric Power Co Inc , 東北電力株式会社 , 株式会社日立製作所
发明人： TAKAHASHI REIJI , YAMAZAKI MAKOTO , AIHARA TAKASHI , SUZUKI TSUTOMU , NAGANO MASAMI , HONGO YASUJI
IPC分类号： G01R31/08 , H02H3/00
摘要： PROBLEM TO BE SOLVED: To provide a method and device for locating a ground fault point of a distribution line by a capacitor addition method for accurately locating the ground fault point even when noise is in a measured current waveform.
SOLUTION: Ground accident current flowing in a capacitor disposed between the distribution line and the ground is measured, a first current is determined by eliminating a harmonic component, and the first current is Fourier-transformed to obtain the magnitude of the content included in each frequency band of a predetermined width. The frequency bands are ranked in the descending order of the content, the frequency bands between a maximum frequency band and a minimum frequency band are determined until a predetermined order, a second current which is the component of a frequency band between the maximum frequency band and minimum frequency bands is determined based on the first current, and a ground accident point of the distribution line is calculated based on the gradient of the second current.
COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供一种用于通过电容器添加方法来定位配线的接地故障点的方法和装置，用于即使当噪声处于测量的电流波形时也能精确地定位接地故障点。
解决方案：测量在配电线路和地线之间流过的电容器中的地面事故电流，通过消除谐波分量来确定第一电流，并对第一电流进行傅里叶变换，以获得包含的内容的大小在预定宽度的每个频带中。频带以内容的降序排列，确定最大频带和最小频带之间的频带，直到预定顺序为第二电流，第二电流是最大频带和最大频带之间的频带的分量基于第一电流确定最小频带，并且基于第二电流的梯度来计算配线的接地事故点。版权所有（C）2011，JPO＆INPIT

2. 发明专利

JP2004320859A Reactive power compensator 审中-公开
公开(公告)号：JP2004320859A
公开(公告)日：2004-11-11
申请号：JP2003108996
申请日：2003-04-14
申请人： Hitachi Ltd , Tohoku Electric Power Co Inc , 東北電力株式会社 , 株式会社日立製作所
发明人： ONOSE TAKAYUKI , AIHARA TAKASHI , MAEDA EIICHIRO , MADORI IWAO , ISHIOKA OSAMU , ICHIKAWA YOSHINORI , FUSE TAKASHI , INAMURA SATOSHI
IPC分类号： H02J3/16 , G05F1/67 , H02J3/18
CPC分类号： Y02E10/763 , Y02E40/34
摘要： PROBLEM TO BE SOLVED: To supply an electric power of improved quality to a load system by controlling a wind energy bus line voltage within a tolerable voltage range to suppress voltage fluctuation. SOLUTION: A detection voltage detected from a system bus line 1 is inputted in a voltage deviation preventing/controlling device 15. If the detection voltage deviates out of the tolerable voltage range, the detection voltage value is processed in addition or subtraction to control a capacitor 13 and a branch reactor 12 of a reactive power control circuit 10, so that a voltage of the system bus line 1 of wind energy in a reactive power compensator SVC is controlled to a prescribed value. COPYRIGHT: (C)2005,JPO&NCIPI

3. 发明专利

JP2004282878A System and method for simulating fluctuations in output of distributed power supply 审中-公开
公开(公告)号：JP2004282878A
公开(公告)日：2004-10-07
申请号：JP2003069713
申请日：2003-03-14
申请人： Hitachi Ltd , Tohoku Electric Power Co Inc , 東北電力株式会社 , 株式会社日立製作所
发明人： MAEDA EIICHIRO , AIHARA TAKASHI , MADORI IWAO , SATO HIROMICHI , MINASAWA KAZUO , OHINATA TAKASHI , IWAIDA HIROSHI
IPC分类号： F03D9/00 , H02J3/00
CPC分类号： Y02E10/72
摘要： PROBLEM TO BE SOLVED: To simulate fluctuations in the output of a distributed power supply, in a manner close to reality. SOLUTION: For natural energy amount generated by a natural energy amount generator 101, a basic characteristic model 102 generates a theoretical output determined by the power generation performance characteristics of generator and outputs it. For natural energy amount, an output fluctuation simulating unit 104 simulates an output fluctuation content, according to probability distribution (e.g., normal distribution) as the fluctuation content of the theoretical output, determined by the power generation performance characteristics of the generator, and outputs it. An adder 103 adds the output of the basic characteristic model 102 and the output of the output fluctuation simulating unit 104, to simulate uncertain output fluctuations, as are observed in actual equipment. In the basis of the result of this simulation, an electric power system is analyzed by the fluctuations in the output of realistic distributed power supplies. COPYRIGHT: (C)2005,JPO&NCIPI

4. 发明专利

JP2004064941A Distributed power supply analysis system 审中-公开
标题翻译：分布式电源分析系统
公开(公告)号：JP2004064941A
公开(公告)日：2004-02-26
申请号：JP2002222323
申请日：2002-07-31
申请人： Hitachi Ltd , Tohoku Electric Power Co Inc , 東北電力株式会社 , 株式会社日立製作所
发明人： AIHARA TAKASHI , MAEDA EIICHIRO , MADORI IWAO , SATO HIROMICHI , OHINATA TAKASHI , IWAIDA HIROSHI
IPC分类号： H02J3/00
摘要： PROBLEM TO BE SOLVED: To provide a distributed power supply analysis system capable of comprehensively analyzing various influences of a large variety of distributed power supplies on a system when they are introduced based on a small and limited number of pieces of data on distributed power supplies. SOLUTION: Based on a small and limited number of pieces of data (e.g. installation point distance, installation point capacity, output fluctuation, energy source fluctuation) about existing distributed power supplies, the distributed power supply analysis system creates stochastically apparently hard data about an unknown distributed power supply using a distributed power supply instantaneous value analysis library, a probability distribution generating tool, a map information system, and the like. Such an unknown distributed power supply is, for example, a distributed power supply the information of which is difficult to procure, and a distributed power supply which is planned to be introduced in the future. Thus, the distributed power supply analysis system evaluates various influences of the introduction of a large variety of distributed power supplies on the system. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供一种分布式电源分析系统，其能够在基于分布式数据的小数量有限数量的数据引入时综合分析系统中各种各样的分布式电源的各种影响电源。解决方案：基于关于现有分布式电源的小量有限数量的数据（例如安装点距离，安装点容量，输出波动，能源波动），分布式电源分析系统创建随机显式硬数据关于使用分布式电源瞬时值分析库的未知分布式电源，概率分布生成工具，地图信息系统等。这种未知的分布式电源例如是其信息难以获得的分布式电源，以及计划在将来引入的分布式电源。因此，分布式电源分析系统评估了在系统上引入各种分布式电源的各种影响。版权所有（C）2004，JPO

5. 发明专利

JP2005198461A Effective-power control device 有权
标题翻译：有效功率控制装置
公开(公告)号：JP2005198461A
公开(公告)日：2005-07-21
申请号：JP2004004295
申请日：2004-01-09
申请人： Hitachi Ltd , Tohoku Electric Power Co Inc , 東北電力株式会社 , 株式会社日立製作所
发明人： ONOSE TAKAYUKI , AIHARA TAKASHI , NAMATAME SATORU , URANO KIMIO , WAKU HIDEKI , SATO TAKU
IPC分类号： H02J3/38
摘要： PROBLEM TO BE SOLVED: To restrain generation of a reverse power flow without stopping the operation of an effective power output apparatus when the reverse power flow occurs. SOLUTION: Effective power (P Line ) 7 at a linkage point 3 is calculated from a voltage by an output of a transformer 14 and a current by an output of a current transformer 15 using an effective power calculating device 16. If the effective power (P Line ) 7 is negative, an effective-power control circuit 13takes it as a reverse flow being generated, performs control for narrowing down the output for an effective-power output apparatus 5 without stopping the operation of the effective-power output apparatus 5, and performs control so that the effective power (P Line ) 7 may be zero, thus restraining the reverse power flow immediately. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：在发生反向电力流时，抑制反向电力流的产生而不停止有效电力输出装置的操作。
解决方案：通过变压器14的输出的电压和电流互感器15的输出使用有效的电力来计算在点3处的有效功率（P 线）7 功率计算装置16.如果有效功率（P 线路）7为负，有效功率控制电路13将其作为产生的反向流动，执行用于缩小输出的控制，功率输出装置5，而不停止有效功率输出装置5的动作，进行有效功率（P 线路）7的控制，从而能够立即抑制反向功率流。版权所有（C）2005，JPO＆NCIPI

6. 发明专利

JP2004320860A Reactive power compensator 审中-公开
标题翻译：无功补偿器
公开(公告)号：JP2004320860A
公开(公告)日：2004-11-11
申请号：JP2003108999
申请日：2003-04-14
申请人： Hitachi Ltd , Tohoku Electric Power Co Inc , 東北電力株式会社 , 株式会社日立製作所
发明人： ONOSE TAKAYUKI , MAEDA EIICHIRO , AIHARA TAKASHI , MADORI IWAO , ISHIOKA OSAMU , ICHIKAWA YOSHINORI , FUSE TAKASHI , INAMURA SATOSHI
IPC分类号： H02J3/16 , G05F1/70 , H02J3/18
CPC分类号： Y02E10/763 , Y02E40/34
摘要： PROBLEM TO BE SOLVED: To stabilize a system voltage by reducing voltage fluctuation in a power system. SOLUTION: A reactive power from a voltage fluctuation suppressing circuit 27 and a reactive power value of the difference between a reactive power detection value and a reactive power command value are inputted in a reactive power compensator 25. A voltage fluctuation of a power grid decreases by such amount as the increase/decrease in the reactive power value outputted from the increase/decrease value of the reactive power of the reactive power compensator 25, and the value from a capacitor element 25C and a reactance element 25L is suppressed in the power system, resulting in a stabilized system voltage. COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：通过减少电力系统中的电压波动来稳定系统电压。解决方案：来自电压波动抑制电路27的无功功率和无功功率检测值与无功功率指令值之间的差的无功功率值被输入到无功功率补偿器25中。功率的电压波动电网减少了从无功功率补偿器25的无功功率的上升/下降值输出的无功功率值的上升/下降量，并且抑制来自电容器元件25C和电抗元件25L的值电力系统，导致系统电压稳定。版权所有（C）2005，JPO＆NCIPI

7. 发明专利

JP2004153957A Power conversion apparatus 有权
公开(公告)号：JP2004153957A
公开(公告)日：2004-05-27
申请号：JP2002317638
申请日：2002-10-31
申请人： Hitachi Ltd , Tohoku Electric Power Co Inc , 東北電力株式会社 , 株式会社日立製作所
发明人： KIYOFUJI YASUHIRO , AIHARA TAKASHI , KAWABATA KATSUTO , ONOSE TAKAYUKI , ISHIDA YUJI , URANO KIMIO , SATO TAKU , WAKU HIDEKI
IPC分类号： H02M7/48
摘要： PROBLEM TO BE SOLVED: To provide a power conversion apparatus capable of preventing the occurrence of an excess current by quickly responding if an abnormality occurs in a grid to abruptly change a grid voltage, and suppressing the output of an unbalance component or a harmonic component in a normal time. SOLUTION: Filters 15 and 16 input a detection voltage of the grid through a three-phase/dq axes converter 5. A grid abnormality determination means 17 inputs one of the outputs of the three-phase/dq axes converter 5, and outputs a time constant switching command to the filters 15 and 16 when the change rate exceeds a prescribed value. The filters 15 and 16 switch a response time constant to a long value in a normal time or to a short value at grid abnormality under the time constant switching command. COPYRIGHT: (C)2004,JPO

8. 发明专利

JP2001268798A ELECTRIC POWER STORING SYSTEM 失效
公开(公告)号：JP2001268798A
公开(公告)日：2001-09-28
申请号：JP2000079300
申请日：2000-03-16
申请人： HITACHI LTD , TOHOKU ELECTRIC POWER CO
发明人： KIYOFUJI YASUHIRO , AIHARA TAKASHI , MADORI IWAO , TOYODA MASASHI , SUGIURA YASUYUKI , ICHINOSE MASAYA , FUTAMI MOTOO , UEDA SHIGETA , URANO KIMIO , SATO TAKU , WAKU HIDEKI , YAGI MAKOTO
IPC分类号： H02H3/16 , H02H3/20 , H02J3/12 , H02J3/32 , H02J15/00 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To improve operation continuity and safety (sure protective stop) when an accident is generated in a linked AC system of electric power storing system. SOLUTION: The electric power storing system equipped with an AC-DC converting apparatus 2 and a secondary battery 3 is connected with a connection point 8 of a three-phase AC system 1. Each of the line voltages of the connection point 8 is inputted in a positive phase voltage detecting part 4, which performs discrete Fourier transformation and detects a positive phase voltage amplitude Vs and a positive phase voltage phase θs on the basis of the transformed real axis component and imaginary axis component. In order to adjust AC power outputted from the AC-DC converting apparatus 2, a power conversion control part 6 performs vector control of an output voltage Vc of the converting apparatus 2 on the basis of the positive phase component phase θs of a connection point voltage at the connection point 8, and maintains stable control when a system accident is generated. A protective stop judging part 5 outputs a stop signal and stops the electric power storing system, when generation of an accident necessary for protective stop like 3-line grand fault is judged on the basis of the positive phase component amplitude Vs of the connection point voltage.

9. 发明专利

JP2003102130A POWER STORAGE SYSTEM 审中-公开
公开(公告)号：JP2003102130A
公开(公告)日：2003-04-04
申请号：JP2001287733
申请日：2001-09-20
申请人： TOHOKU ELECTRIC POWER CO , HITACHI LTD
发明人： URANO KIMIO , SATO TAKU , WAKU HIDEKI , KIYOFUJI YASUHIRO , AIHARA TAKASHI , MADORI IWAO , ISHIDA YUJI , ICHINOSE MASAYA
IPC分类号： H02J3/32 , H02J3/16 , H02J3/18
摘要： PROBLEM TO BE SOLVED: To provide a high reliability power storage system by adding a function for reducing flickers of a linkage system, in a arrange which will not influence the operation, although the power storage system is normally used for equalizing a load. SOLUTION: In a control system of an A/D converter 10 in the power storage system, a positive phase voltage 14 (e.g., effective value of the fundamental wave for the past 20 ms) is calculated continuously from a voltage at a battery system linkage point 6 by using DFT (Discrete Fourier Transform), a PQ vector control (a control for independently self-regulating active and reactive power of a self-excited converter to an arbitrary PQ instruction value) is implemented, by using the positive phase voltage at the linkage point as a reference, and the flickers are suppressed by filtering the positive phase voltage by using a high-pass filter, multiplying a filtered signal by the gain and adding the multiplied result to a horizontal axis current regulating part of the PQ vector control as a correction quantity.

10. 发明专利

JP2014103296A Estimation method of transformer characteristics 有权
标题翻译：变压器特性的估计方法
公开(公告)号：JP2014103296A
公开(公告)日：2014-06-05
申请号：JP2012255045
申请日：2012-11-21
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： AIHARA TAKASHI , TOKURA TOSHIYUKI , INAGAKI KEIZO , TOKUNAGA YOSHITAKA , ABE MINORU
IPC分类号： H01F41/00
摘要： PROBLEM TO BE SOLVED: To provide an estimation method of the transformer characteristics which allows for estimation of the % air core reactance or in-rush current of a transformer, by using the information that anyone can know.SOLUTION: An estimation method for knowing the unknown characteristics of a transformer comprises: an information collection organization step of making a regression equation representing the correlation of % short circuit impedance and % air core reactance, from the data of % short circuit impedance and % air core reactance, the data of a plurality of transformers being known in advance; and a characteristics estimation step of an unknown transformer for acquiring the value of % short circuit impedance, described in the faceplate of a transformer, for a transformer the value of air core reactance of which is unknown, and estimating the % air core reactance of the transformer by substituting the value of % short circuit impedance thud acquired into the regression equation.
摘要翻译：要解决的问题：提供允许通过使用任何人可以知道的信息来估计变压器的％空气磁芯电抗或浪涌电流的变压器特性的估计方法。解决方案：一种用于知道变压器的估计方法变压器的未知特性包括：信息收集组织步骤，根据％短路阻抗和％空心电抗的数据，形成代表％短路阻抗和％空心电抗的相关性的回归方程，多个数据的变压器提前知道; 以及未知变压器的特性估计步骤，用于获取变压器面板中描述的变压器的空心电抗值未知的％短路阻抗值，并估计变压器面板的空心电抗的％变压器通过将所获得的％短路阻抗值代入回归方程。

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