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1. 发明专利

JP2011047839A Vector measuring device, vector measuring system, and vector measuring method 有权
标题翻译：矢量测量装置，矢量测量系统和矢量测量方法
公开(公告)号：JP2011047839A
公开(公告)日：2011-03-10
申请号：JP2009197573
申请日：2009-08-28
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： BANDO AKIRA , KIYOFUJI YASUHIRO , ICHINOSE MASAYA , HIGUCHI MIKISUKE
IPC分类号： G01R23/16
摘要： PROBLEM TO BE SOLVED: To provide a method for measuring highly accurately at high speed, a frequency and a vector of an AC signal.
SOLUTION: Measurement data which are AC signals are inputted, and a fundamental wave component of discrete Fourier transform is operated by performing weighted addition with a complex constant determined by being repeated with a period which is a natural number. In the operation of the fundamental wave component, the operation is performed a plurality of times by changing the period of the discrete Fourier transform, and the frequency is operated from the ratio of each operation result of the discrete Fourier transform having each different period, and a phase detection result, by using a plurality of operation results of the discrete Fourier transform.
COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供一种高速精确地测量AC信号的频率和矢量的方法。
解决方案：输入作为交流信号的测量数据，并且通过以通过以自然数的周期重复确定的复常数执行加权相加来操作离散付里叶变换的基波分量。在基波分量的运算中，通过改变离散付里叶变换的周期来进行多次运算，并且从每个不同周期的离散付里叶变换的运算结果的比例来操作频率，以及通过使用离散付里叶变换的多个运算结果，进行相位检测结果。版权所有（C）2011，JPO＆INPIT

2. 发明专利

JP2003037938A Power conversion system 有权
标题翻译：电力转换系统
公开(公告)号：JP2003037938A
公开(公告)日：2003-02-07
申请号：JP2001225462
申请日：2001-07-26
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： HIGUCHI MIKISUKE
IPC分类号： H02J3/00 , H02J3/12
摘要： PROBLEM TO BE SOLVED: To support to the operation that a voltage on the system side or the load side becomes almost zero. SOLUTION: When a system voltage is lost while power is supplied from the power system 12 to the load 14 through a breaker 20 and a series transformer 24, the breaker 20 is opened, a shorting switch 22 is turned on, primary windings of phases of the series transformer 24 are mutually shorted, energy charged in an energy charging element 30 is supplied to the load 14 through a series power converter 28 and the series transformer 24 used as a delta-star connection transformer, and power to the load 14 is prevented from being interrupted while the energy charging element 30 maintains the energy.
摘要翻译：要解决的问题：为了支持系统侧或负载侧的电压几乎为零的操作。解决方案：当通过断路器20和串联变压器24从电力系统12向负载14供电时系统电压消失，断路器20断开，短路开关22接通，初级绕组绕组串联变压器24相互短路，能量充电元件30中的能量充电通过串联功率转换器28和用作三角星型连接变压器的串联变压器24提供给负载14，并且防止对负载14的电力在能量充电元件30保持能量的同时被中断。

3. 发明专利

JP2004096871A Linkage protection system for distributed power supply equipment 审中-公开
公开(公告)号：JP2004096871A
公开(公告)日：2004-03-25
申请号：JP2002253336
申请日：2002-08-30
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： UCHIYAMA TOMOYUKI , ONO YASUNORI , ARITA HIROSHI , HIGUCHI MIKISUKE , KAWAMURA NAOTERU
IPC分类号： H02J3/38
摘要： PROBLEM TO BE SOLVED: To provide a linkage protection system for distributed power supply equipment capable of performing smooth arithmetic processing. SOLUTION: A circuit breaker 12 for bus-bar communication is inserted into a bus bar 16 which connects between a power system 4 and distributed power supply equipment 5. A passing current I is detected by a current detector 13. A voltage on the power system side is detected by a voltage detector 14. The voltage on the distributed power supply equipment side is detected by a voltage detector 15. The detected current and each detected voltage are fetched into a control device 11. In the control device 11, a momentary voltage drop is detected by a combination of overcurrent or a current variation rate and a voltage drop, and a single run is detected according to a frequency variation rate of the voltage on the distributed power supply side. It is determined whether the direction of the power in the bus bar 16 is a direction from the distributed power supply equipment 5 side to the power system 4 side. The circuit breaker 12 is opened by outputting an interrupting instruction from the control device 11 to the circuit breaker 12 for the bus-bar connection, when the condition of a logic product between the positive determination result and the momentary voltage drop is satisfied or when the single run is detected. COPYRIGHT: (C)2004,JPO

4. 发明专利

JP2003047156A Linkage protection system for distributed power supply facility 有权
标题翻译：用于分布式电源设施的连接保护系统
公开(公告)号：JP2003047156A
公开(公告)日：2003-02-14
申请号：JP2001227211
申请日：2001-07-27
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： UCHIYAMA TOMOYUKI , ONO YASUNORI , ARITA HIROSHI , HIGUCHI MIKISUKE
IPC分类号： H02H3/24 , H02H3/46 , H02J3/38 , H02J3/42
摘要： PROBLEM TO BE SOLVED: To smoothly execute calculation process. SOLUTION: A circuit breaker 12 for bus-bar communication is inserted into a bus bar 16 which connects between a power system 4 and a distributed power supply facility 5; a passing current I is detected by a current detector 13; a voltage on the power system side is detected by a voltage detector 14; a voltage on the distributed power supply facility side is detected by a voltage detector 15; the detected current and each detected voltage are fetched in a control device 11; in the control device 11, an momentary voltage drop is detected by a combination of overcurrent or a current variation rate and a voltage drop, and a single operation is detected according to a frequency variation rate of the voltage on the distributed power supply side; and the circuit breaker 12 is opened by outputting an interrupting instruction from the control device 11 to the circuit breaker 12 for the bus-bar connection, when the momentary voltage drop is detected or when the single operation is detected.
摘要翻译：要解决的问题：顺利执行计算过程。解决方案：用于母线通信的断路器12插入连接在电力系统4和分布式供电设备5之间的母线16中; 通过电流检测器13检测出通过电流I; 由电压检测器14检测电力系统侧的电压; 通过电压检测器15检测分布式供电设备侧的电压; 检测到的电流和每个检测的电压被提取在控制装置11中; 在控制装置11中，通过过电流或电流变化率与电压降的组合检测瞬时电压降，根据分布式电源侧的电压的频率变化率来检测单个动作; 并且当检测到瞬时电压降或检测到单次操作时，通过输出从控制装置11到汇流条连接的断路器12的中断指令来断开断路器12。

5. 发明专利

JP2002374624A Load voltage regulator 审中-公开
标题翻译：负载电压调节器
公开(公告)号：JP2002374624A
公开(公告)日：2002-12-26
申请号：JP2001181253
申请日：2001-06-15
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： FUTAMI MOTOO , ISHIZAKI SHINICHI , KITAMURA HIROSHI , HIGUCHI MIKISUKE , UEDA SHIGETA
IPC分类号： H02J9/06 , G05F1/70 , H02J3/18 , H02M7/48
CPC分类号： Y02E40/30
摘要： PROBLEM TO BE SOLVED: To provide a load voltage regulator suitable for regulating load voltage and power supply power factor, without increasing the size thereof. SOLUTION: The load voltage regulator is constituted of a power converter INV1 connected via a transformer T1 inserted in parallel between a power system 1 and a load L1, and a power converter INV2 connected in parallel with the system side of the transformer; the power converter INV1 adjusts the amplitude and phase of a load voltage VL, so that the voltage on the load side of the transformer has desired voltage amplitude. The power converter INV2 regulates the direct-current voltage of direct-current filter capacitors C1 and C2, to a desired magnitude and further supplies a current different in phase from the voltage of the power system so that the phase of the load current IL or the current I1 of the power converter INV1 has desired phase. The load voltage phase is adjusted by the power converter INV1, so that desired power factor is obtained on the receiving side, and the amplitude of a current supplied from the power converter INV2 is determined according to the phase error, after the adjustment of the load voltage phase by the power converter INV1.
摘要翻译：要解决的问题：提供适合于调节负载电压和电源功率因数的负载电压调节器，而不增加其尺寸。解决方案：负载电压调节器由通过并联插入电力系统1和负载L1之间的变压器T1连接的功率转换器INV1和与变压器的系统侧并联连接的功率转换器INV2构成; 功率转换器INV1调整负载电压VL的幅度和相位，使得变压器的负载侧的电压具有期望的电压幅度。功率转换器INV2将直流滤波电容器C1和C2的直流电压调节到期望的幅度，并且进一步向电力系统的电压提供不同相位的电流，使得负载电流IL或功率转换器INV1的电流I1具有期望的相位。由功率转换器INV1调节负载电压相位，从而在接收侧获得期望的功率因数，并且在负载调整之后根据相位误差确定从功率转换器INV2提供的电流的幅度电压转换器INV1的电压相位。

6. 发明专利

JPH10201296A AC EXCITATION TYPE GENERATOR-MOTOR 失效
公开(公告)号：JPH10201296A
公开(公告)日：1998-07-31
申请号：JP400597
申请日：1997-01-13
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： ENDO MASAICHI , MAOKA AKIHIRO , HIGUCHI MIKISUKE , FUTAMI MOTOO , ICHINOSE MASAYA , MINOGUCHI KIYOSHI
IPC分类号： H02J3/24 , H02J3/30 , H02P9/00
摘要： PROBLEM TO BE SOLVED: To improve the stability of an AC power system by performing speed control at waiting operation, and performing the effective power control in the case that abnormality occurs in an AC power system, and discharging and absorbing the effective power from an AC excitation type generator-motor suddenly. SOLUTION: In the condition that an AC excitation type of generator-motor 2 is performing waiting operation, a switch 11 is closed, and a switch 12 is opened, and the phase control of the AC excitation type generator-motor 2 is performed with the output signal of a speed controller 6, and it is controlled so as to reduce the deviation between the rotational speed detected by a speed detector 5 and the rotational speed command value, thus the speed control operation is performed. In case that abnormality occurs in an AC power system, the switch 11 is opened, and the switch 12 is closed, and the output signal of a power controller 8 is inputted into a current controller 9, and it is controlled as a to reduce the deviation between the active power supplied from the AC power system 1 detected by the power detector 7 and the active power command value given from outside, thus the active power control operation is performed.

7. 发明专利

JP2000152664A POWER CONVERTER WITH OVERVOLTAGE-PREVENTING DEVICE 失效
公开(公告)号：JP2000152664A
公开(公告)日：2000-05-30
申请号：JP32314398
申请日：1998-11-13
申请人： HITACHI LTD
发明人： KUBOTA YUZURU , FUTAMI MOTOO , ICHINOSE MASAYA , MOTOBE MITSUSACHI , KAYUKAWA SHIGEHIRO , HIGUCHI MIKISUKE
IPC分类号： H02M7/48 , H02M7/483 , H02M7/72 , H02P9/00
摘要： PROBLEM TO BE SOLVED: To prevent the overvoltage of a multiplex power converter and at the same time reduce the voltage load to a specific switching element by independently determining the operation/non-operation of a chopper circuit that is provided for each capacitor so that a DC voltage for each capacitor of a power converter can be set within a predetermined range. SOLUTION: When a DC differential voltage is generated between DC smoothing capacitors 5 and 7 when a system fails, an upper chopper circuit 6 and a lower chopper circuit 8 are operated and the energy of the DC smoothing capacitors 5 and 7 is discharged if a first predetermined voltage is exceeded, based on the DC voltage detection signal of the DC smoothing capacitors 5 and 7 by an upper control circuit 13 and a lower control circuit 14. When the level becomes lower than a second predetermined level, operation is stopped. As a result, by allowing each different chopper current to flow to the upper and lower chopper circuits 6 and 8, the upper and lower DC voltage is controlled a given value or less and the overvoltage of power converters 1 and 2 is prevented, thus reducing the load of voltage to a switching element.

8. 发明专利

JPH10191640A CONTROLLER FOR CONVERTER 失效
公开(公告)号：JPH10191640A
公开(公告)日：1998-07-21
申请号：JP34710096
申请日：1996-12-26
申请人： HITACHI LTD
发明人： KUBOTA YUZURU , MOTOBE MITSUSACHI , FUTAMI MOTOO , ICHINOSE MASAYA , HIGUCHI MIKISUKE
IPC分类号： H02M7/162 , H02M7/12 , H02M7/155 , H02M7/17 , H02M7/483 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To suppress change of a DC output voltage by breaking down input voltages of two or more sets of converters connected in series to d-axis and q-axis components of rotary coordinate axes, controlling them, and correcting the q-axis component in response to a difference of the output voltages of the respective converters. SOLUTION: AC powers from an AC voltage 5 are converted into DC powers by converters 1, 2 via transformers 3, 4 and supplied to capacitors 6, 7 and load 8. In the case of controlling the converters 1, 2, it is converted into effective current Iq and reactive current Id based on a voltage reference phase detected from a sine wave generator 17, and input voltages of the converters 1, 2 are controlled by an effective current controller 20 and reactive current controller 21. Thus, phases of a power source voltage and power source current coincide, and power factor of the power source can be controlled to '1'. Simultaneously, an output of a voltage controller 15 is set to an effective current command Iq*, thereby maintaining a combined DC voltage E of the converters constantly.

9. 发明专利

JPH11220884A PROTECTION DEVICE OF SELF-EXCITATION TYPE CONVERTER, CONTROL DEVICE OF VARIABLE SPEED GENERATION GENERATOR, AND CONTROL DEVICE OF SELF-QUENCHING-TYPE CONVERTER 失效
公开(公告)号：JPH11220884A
公开(公告)日：1999-08-10
申请号：JP2173998
申请日：1998-02-03
申请人： HITACHI LTD
发明人： KUBOTA YUZURU , FUTAMI MOTOO , ICHINOSE MASAYA , MAOKA AKIHIRO , HIGUCHI MIKISUKE , MOTOBE MITSUSACHI
IPC分类号： H02M7/48 , H02P9/00
摘要： PROBLEM TO BE SOLVED: To perform gate blocking only for a phase where an overcurrent is generated and to continue gate control for the other phases by independently providing an over-current detection circuit and a gate block circuit for each phase of an inverter. SOLUTION: GTO elements 5a and 5b, GTO elements 7a and 7b, and GTO elements 9a and 9b of a self-quenching-type switching element are connected in series between both terminals of a DC power supply 1 for parallel connection. Further, U, V, and W-phase circuits are used, where diodes 6a-10b are connected in parallel with each GTO element with inverse polarity. Further, current detectors 11a-11c and gate pulse block circuits 13a-13c are independently provided for each phase, thus achieving a function for detecting an eddy current and for performing the gate pulse block of only the GTO element of a phase where the overcurrent is generated. As a result, the GTO element of a phase where the overcurrent is generated is protected from the overcurrent. The other phases continue gate control for achieving continuous operation without stopping a system.

10. 发明专利

JPH11168900A VARIABLE VELOCITY POWER GENERATING MOTOR CONTROL METHOD AND APPARATUS 失效
公开(公告)号：JPH11168900A
公开(公告)日：1999-06-22
申请号：JP33254597
申请日：1997-12-03
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： FUTAMI MOTOO , ICHINOSE MASAYA , KUBOTA YUZURU , MOTOBE MITSUSACHI , HIGUCHI MIKISUKE , ENDO MASAICHI , KATO YUICHI , NISHIO TORU , RIYOUMAN AKIRA
IPC分类号： H02P9/00 , H02P9/14
摘要： PROBLEM TO BE SOLVED: To realize the harmonization of velocity control and effective power control of variable velocity power generating motor. SOLUTION: An effective power exchanged between a power generating motor 3 and a power system 1 and a terminal voltage of the power generating motor 3 are respectively detected, frequency, phase and amplitude of an excitation current of a secondary coil of the power generating motor 3 are controlled based on deviation, in order to adjust these detected values to respective command value and detected value of the rotating velocity of the power generating motor 3 is adjusted to the command value. For compensation of control amount in relation to the effective power on the basis of the velocity deviation, the effective power is preferentially controlled when the detected value of the rotating velocity is in the preset range and the velocity is preferentially controlled when the detected value goes out of the preset range.

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