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41. 发明专利

JP2001190077A POWER CONVERTING SYSTEM AND METHOD FOR CONTROLLING POWER CONVERTER 失效
公开(公告)号：JP2001190077A
公开(公告)日：2001-07-10
申请号：JP37267899
申请日：1999-12-28
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： ICHINOSE MASAYA , FUTAMI MOTOO , UEDA SHIGETA , SUZUKI KAZUO , MAEKAWA SATOSHI , KIYOFUJI YASUHIRO
IPC分类号： H02J3/38 , G05F1/67 , H02J3/32 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To prevent an overcurrent when the self-contained operation of a power converter is switched to a linkage operation in a power converting system linked to a power system. SOLUTION: At a linkage operation resetting time, the power converter is controlled so that the output voltage phase of the power converter coincides with a system voltage phase to close a circuit breaker.

42. 发明专利

JP2001116769A GUARANTY CHARGE PROCESSING METHOD AND PROCESSOR 失效
公开(公告)号：JP2001116769A
公开(公告)日：2001-04-27
申请号：JP29350499
申请日：1999-10-15
申请人： HITACHI LTD
发明人： YABUTANI TAKASHI , NUMANO MINORU , TOYODA MASASHI , KIYOFUJI YASUHIRO , SATO KAZUO
IPC分类号： G01D4/00 , G01R11/00 , G01R11/56 , G06Q30/02 , G06Q30/04 , G06Q50/06
摘要： PROBLEM TO BE SOLVED: To efficiently and effectively utilize a processor by enabling the use of an uniterruptive power supply without initial investment, and paying a charge for a guaranty period. SOLUTION: The operation state data of the uniterruptive power supply for a time guaranteeing the operation of the uniterruptive power supply(UPS) arranged between a load device and a commercial power source and used for uniterruptive operation are output, guaranty charge depending on the time guaranteeing the operation of the uninterruptive power supply is stored, and when the output operation state data satisfies the time gurateeing the operation, the stored guaranty charge is output as a demand for payment. The output operation state data are input to a remote monitoring device through a communication device, and the same operation state data are shown on the data display of the uniterruptive power supply side.

43. 发明专利

JPH05137363A AC-EXCITED DYNAMOTOR 失效
公开(公告)号：JPH05137363A
公开(公告)日：1993-06-01
申请号：JP29299391
申请日：1991-11-08
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KIYOFUJI YASUHIRO , BANDO AKIRA , KAYUKAWA SHIGEHIRO , TSUJI EIJI , NAKADA KENICHI , ONO YASUTERU , KANEDA TOSHIBUMI , NAKAGAWA HIROTO , KUZUSAKA SATOSHI
IPC分类号： H02P1/46 , H02P9/00 , H02P21/22 , H02P21/34 , H02P21/36 , H02P23/00 , H02P23/20 , H02P25/022 , H02P27/04 , H02P27/05 , H02P101/10 , H02P103/10 , H02P103/20
摘要： PURPOSE:To enable an AC-excited synchronous machine to be started smoothly without increasing the capacity of a frequency converter, by DC-exciting the AC-excited synchronous machine through using the output of one phase of the frequency converter for AC-exciting, and by supplying an AC electric power having a variable frequency to the AC-excited synchronous machine through using the outputs of the other two phases of the frequency converter, when starting the AC-excited synchronous machine. CONSTITUTION:When starting an AC-excited synchronous machine 1, switching apparatuses 4a, 4b, 4c, 6c, 8 are open-circuited, and switching apparatuses 7a1, 7b1, 7c1, 9c are closed-circuited. Thereby, a DC electric power is supplied from an output (C) of a frequency converter 5 to primary windings 1s of the AC- excited synchronous machine 1, and an AC electric power having a variable frequency is supplied from outputs (A), (B) of the frequency converter 5 to secondary windings 1r of the machine 1. Thereby, the AC-excited synchronous machine 1 is started and is accelerated as a synchronous machine. Thereby, when starting the AC-excited synchronous machine 1, connection of the outputs of the frequency converter are modified safely, and the machine 1 can be started smoothly without increasing the capacity of the frequency converter.

44. 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.

45. 发明专利

JPH09238478A MULTIPLE POWER INVERTER AND ITS CONTROL METHOD 失效
公开(公告)号：JPH09238478A
公开(公告)日：1997-09-09
申请号：JP4606996
申请日：1996-03-04
申请人： HITACHI LTD
发明人： MIYAZAKI KIYOKO , ICHINOSE MASAYA , FUTAMI MOTOO , KUBOTA YUZURU , KIYOFUJI YASUHIRO , MOTOBE MITSUSACHI
IPC分类号： H02M7/48 , H02M7/483
摘要： PROBLEM TO BE SOLVED: To output an AC voltage faithful to a command, without changing a switching frequency, also when a voltage command of O vicinity at a low frequency continues. SOLUTION: A gate pulse generating circuit 3 has single phase gate pulse generating circuits wherein each phase is the same constitution. A triangular wave CARL and a triangular wave CARLL whose amplitude and frequency are two times those of CARL are generated. The respective triangular waves are compared with a command value VU. Intermediate pulse commands SUU1, 2 and SUL1, 2 are outputted which are 1 when VU is large and 0 when VU is small. An output pulse command SUU which becomes 1 by the quicker rise out of SUU1, 2 and becomes 0 by the quicker fall out of them. Similarly an output pulse command SUL is outputted from SUL1, 2. SUU and SUL pass gate drive circuits, and four gate pulses containing SUU, SUL and the respective inversion signals ignite/extinguish four ignition control elements of U phase of a main circuit, and executes dipole control when the command is 0 vicinity.

46. 发明专利

JPH08322269A CONTROLLER FOR POWER CONVERTER 失效
公开(公告)号：JPH08322269A
公开(公告)日：1996-12-03
申请号：JP14828495
申请日：1995-05-23
申请人： HITACHI LTD
发明人： FUTAMI MOTOO , KUBOTA YUZURU , MIYAZAKI KIYOKO , KIYOFUJI YASUHIRO , MOTOBE MITSUSACHI
IPC分类号： H02M7/72
摘要： PURPOSE: To suppress the wide fluctuation of a DC voltage by accurately detecting the electric energy flowing to a DC side through a power converter and precisely processing the electric energy in a normal state or even when such a disturbance occurs that an unbalanced voltage is generated on the AC side of the power converter or an unbalanced current flows to the AC side of the converter. CONSTITUTION: A controller for a power converter in which two converters 1 and 2 which convert a direct current or alternating current into an alternating current or direct current is provided with a current detecting means 5 which detects the AC-side current of the converter 1, voltage detecting means 9 which detects a pulsative voltage on the AC side of the converter 1, power detecting means 10 which detects the electric power flowing through the converter 1 from the current and voltage detected by the detecting means 5 and 9, and means which corrects commands to the converters 1 and 2 so that the same electric power as the detected electric power flowing through the converter 1 can flow through the converter 2.

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