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1. 发明专利

CA1090417A EXCITATION CONTROL APPARATUS SUITED FOR NORMAL STOP OPERATION OF SYNCHRONOUS GENERATORS 未知
公开(公告)号：CA1090417A
公开(公告)日：1980-11-25
申请号：CA280498
申请日：1977-06-14
申请人： HITACHI LTD
发明人： GOTO MASUO , ISONO AKIRA , MOMOCHI YASUSHI , KAI TAKAAKI
IPC分类号： H02P9/08 , H02P3/06
摘要： EXCITATION CONTROL APPARATUS SUITED FOR NORMAL STOP OPERATION OF SYNCHRONOUS GENERATORS Disclosed is an apparatus for carrying out normal stop of a synchronous generator in an advantageous manner without use of a field breaker. The apparatus comprises a six-phase thyristor converter for controlling field excitation of the synchronous generator in dependence upon terminal voltage thereof, which converter exhibits not only a forward conversion function (power rectifier) but also backward conversion function (power inverter). When a generator operation stop command is produced, the operation of the converter in power rectifier mode is changed over to power inverter mode. During the inverter mode operation, when the terminal voltage of the synchronous generator becomes lower than a preset value, a pair of counter part thyristors among the thyristors constituting the converter are simultaneously fired to bring about a short-circuited state in the excitation circuit with all the firing pulses supplied to the other thyristors being suppressed, thereby to complete the stopping operation for the synchronous generator.

2. 发明专利

DE2813503A1 未知
公开(公告)号：DE2813503A1
公开(公告)日：1978-10-12
申请号：DE2813503
申请日：1978-03-29
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AOTSU HIROAKI , ISONO AKIRA , GOTO MASUO , KIMURA KOICHI , MOMICHI YASUSHI , KAI TAKAAKI IBARAKI , KITAMURA SATOSHI , KAIHARA AKIHISA , IKADA HIROSI
IPC分类号： H02J3/50 , H02P9/10 , H02P9/14 , H02P9/30
摘要： A field control apparatus for a generator having a field winding comprises a terminal voltage control unit for controlling a field current of the generator in accordance with a difference between a terminal voltage signal of the generator and a reference voltage signal, which control unit has at least one of a line drop compensation function, an under-excitation limitation function, an over-excitation limitation function, a power factor regulation function, an armature winding over-current compensation function and a cross-current compensation function. The field control apparatus includes a detector as a common signal source for detecting active power and reactive power components at an output terminal of the generator and means responsive to the output of the detector for performing scalar operation in accordance with a function of the added compensation/control function described above. An output of the operating means is added to the differential signal as an added function signal to control the field current for excitation of the field winding.

3. 发明专利

DE3634328A1 未知
公开(公告)号：DE3634328A1
公开(公告)日：1987-04-09
申请号：DE3634328
申请日：1986-10-08
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SUGIMOTO OSAMU , KATO TADAATSU , SAWA HIDENORI , ITO AKIO , SUGISAKA HIROSHI , NOHARA HARUO , GOTO MASUO
IPC分类号： H02J3/40 , H02P9/10 , H02P7/46
摘要： A control system for controlling the load of an AC motor/generator of secondary AC excitation type connected to a power system in parallel to at least a synchronous machine. The AC motor/generator has the secondary excitation winding thereof controlled in the amount of excitation so as to generate an output in accordance with an external output command. In the case of variation of power flow between the power system and the synchronous machine, the output command is corrected in accordance with the variation, and the amount of the secondary excitation is controlled by the corrected output command, whereby the variation of power flow between the power system and the synchronous machine is absorbed by the AC motor/generator thereby to prevent the synchronous machine from stepping out.

4. 发明专利

CA1105558A EXCITATION CONTROL APPARATUS FOR A GENERATOR 未知
公开(公告)号：CA1105558A
公开(公告)日：1981-07-21
申请号：CA299954
申请日：1978-03-29
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： AOTSU HIROAKI , ISONO AKIRA , GOTO MASUO , KIMURA KOICHI , MOMOCHI YASUSHI , KAI TAKAAKI , KITAMURA SATOSHI , KAIHARA AKIHISA , OKADA HIROSI
IPC分类号： H02J3/50 , H02P9/10 , H02P9/14 , H02P9/30
摘要： 39/11 EXCITATION CONTROL APPARATUS FOR A GENERATOR A field control apparatus for a generator having a field winding comprises a terminal voltage control unit for controlling a field current of the generator in accordance with a difference between a terminal voltage signal of the generator and a reference voltage signal, which control unit has at least one of a line drop compensation function, an under-excitation limitation function, an over-excitation limitation function, a power factor regulation function, an armature winding over-current compensation function and a cross-current compensation function. The field control apparatus includes a detector as a common signal source for detecting active power and reactive power components at an output terminal of the generator and means responsive to the output of the detector for performing scalar operation in accordance with a function of the added compensation/control function described above. An output of the operating means is added to the differential signal as an added function signal to control the field current for excitation of the field winding.

5. 发明专利

CA1070757A FIELD OVERVOLTAGE PROTECTING APPARATUS FOR SYNCHRONOUS MACHINE 未知
公开(公告)号：CA1070757A
公开(公告)日：1980-01-29
申请号：CA274887
申请日：1977-03-28
申请人： HITACHI LTD
发明人： MATUZAKI TAKESHI , GOTO MASUO , MOMOCHI YASUSHI
IPC分类号： H02P9/30 , H02H7/08 , H02P5/12
摘要： FIELD OVERVOLTAGE PROTECTING APPARATUS FOR SYNCHRONOUS MACHINE An apparatus for protecting a synchronous machine from a field overvoltage is disclosed. The apparatus comprises a field excitation control circuit which is impressed with the armature voltage of the synchronous machine so as to provide a DC power supply for producing a DC output to excite the field winding of the synchronous machine, a first discharge circuit which is adapted to discharge the stored energy of the field winding when the synchronous machine is to be tripped under predetermined conditions, and a second discharge circuit for reducing the field voltage by allowing a field current to flow therethrough in response to generation of an overvoltage whose absolute value is higher than a predetermined level, across the field winding. The resistance of the second discharge circuit is selected to be higher than that of the first discharge circuit so that even in the presence of an overvoltage across the field winding, the overvoltage is suppressed by the second discharge circuit thereby to prevent frequent tripping of the synchronous machine due to overvoltage.

6. 发明专利

DE3686804T2 未知
公开(公告)号：DE3686804T2
公开(公告)日：1993-02-11
申请号：DE3686804
申请日：1986-07-21
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： HARAGUCHI EIJI , NAKAGAWA HIROTO , NOHARA HARUO , GOTO MASUO , KUWAHARA TAKAO , BANDO AKIRA , ONO KENICHI
IPC分类号： H02P7/635

7. 发明专利

DE3686804D1 未知
公开(公告)号：DE3686804D1
公开(公告)日：1992-10-29
申请号：DE3686804
申请日：1986-07-21
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： HARAGUCHI EIJI , NAKAGAWA HIROTO , NOHARA HARUO , GOTO MASUO , KUWAHARA TAKAO , BANDO AKIRA , ONO KENICHI
IPC分类号： H02P7/635

8. 发明专利

JP2000224896A DC TRANSMISSION-CONTROLLING DEVICE 失效
公开(公告)号：JP2000224896A
公开(公告)日：2000-08-11
申请号：JP2520199
申请日：1999-02-02
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO , SHIKOKU ELEC POWER , ELECTRIC POWER DEV CO
发明人： SEKOGUCHI MASAHIRO , GOTO MASUO , MADORI IWAO , YOSHIZUMI TATSUNORI , AZUMA MASAKI , MURAKAMI HIROAKI , KATO KAZUO
IPC分类号： H02J3/36 , H02P9/00
摘要： PROBLEM TO BE SOLVED: To detect a frequency other than a shaft torsional vibration frequency region according to the bus voltage of a DC conversion station, and to efficiently suppress and control shaft torsion. SOLUTION: A device is equipped with frequency detectors 142a-142c that detect frequencies fa, fb, and fx of each phase according to phase voltages Va, Vd, and Vc of an AC bus 5 of a DC conversion station being connected to a generator 2, an averaging circuit 143 that obtains the average value of the frequencies fa, fb, and fc for detecting the frequency of the bus 5, a filter 144 and a judgment circuit 145 that detect shaft torsional vibration according fluctuation in the frequency of the bus 5, a filter 147 that detects a control signal for suppressing the detected shaft torsional vibration, and an adder 150 that adds the control signal to the output of a constant current-controlling device 149. By the output of the adder 150, the control angle of the DC conversion station is adjusted for suppressing the shaft torsional vibration.

9. 发明专利

JP2516210B2 失效
公开(公告)号：JP2516210B2
公开(公告)日：1996-07-24
申请号：JP6906887
申请日：1987-03-25
申请人： HITACHI LTD
发明人： GOTO MASUO , NOHARA GOO , KANO YASUNOBU
IPC分类号： H02P9/04

10. 发明专利

JPH06245385A METHOD AND APPARATUS FOR STABILIZING POWER SYSTEM 失效
公开(公告)号：JPH06245385A
公开(公告)日：1994-09-02
申请号：JP2894693
申请日：1993-02-18
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： FUJITA HIDENORI , KUREBAYASHI HISASHI , TAKAHAMA AKIRA , NOHARA GOO , GOTO MASUO
IPC分类号： H02J3/24
摘要： PURPOSE:To stabilize a power system based on a time change of effective power and reactive power to control phase shift of a phase-shift transformer at the time of a fault. CONSTITUTION:The apparatus for stabilizing a power system comprises phase shift control means 13 for calculating effective power and reactive power from voltage and current of the system to decide a phase shift amount responsive to it, time deciding means 12 for obtaining time changes of the effective and reactive powers to decide a time in which the time change of the effective power is increased and the time change of the reactive power is decreased, and switching means 15 for switching outputs of fault control means 11 for outputting a preset phase shift amount from lapse of set time to output of the means 12, the means 13 and the means 11.

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