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11. 发明专利

JPH03145944A AC-EXCITED ROTARY ELECTRIC MACHINE 失效
公开(公告)号：JPH03145944A
公开(公告)日：1991-06-21
申请号：JP28164089
申请日：1989-10-31
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： TSUJI EIJI , YASAKA YASUHIRO , NAGURA OSAMU , BANDO AKIRA , KITA EIZO , NAKAGAWA HIROTO , ONO YASUTERU , KUZUSAKA SATOSHI
IPC分类号： H02J15/00
摘要： PURPOSE:To prevent disturbance of a power system by starting an AC excitation rotary electric machine by power stored in a superconduction energy accumulating device through a converter which is capable of performing forward- reverse converting action. CONSTITUTION:A superconduction energy accumulating device 18 is normally held in a state of being charged with power from a power system 5 through power converters 19, 20. An AC excitation rotary electric machine 1, when it is started, is separated from the power system 5, and power is supplied to an excitation frequency converter 7 from the superconductive energy accumulating device 18 through the power converters 19, 20. The AC excitation rotary electric machine 1, when its rotary speed reaches a specified value, is connected to the power system 5 simultaneously with the change of connection of the excitation frequency converter 7 reconnected from the superconductive energy accumulating device 18 to the power system. The AC excitation rotary electric machine can be easily started without giving disturbance to the power system 5, resulting in an improvement of the stability of the power system.

12. 发明专利

JPH01243825A VARIABLE-SPEED INDUCTION GENERATOR/MOTOR CONTROLLER 失效
公开(公告)号：JPH01243825A
公开(公告)日：1989-09-28
申请号：JP6956388
申请日：1988-03-25
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： ITO AKIO , SAWA SHUSUKE , SUGISAKA HIROSHI , KITA EIZO , NAKAGAWA HIROTO , ONO YASUTERU
IPC分类号： H02J3/24 , G05F1/70 , H02J3/18
摘要： PURPOSE:To distinguish the internal accident or communication failure of a cycloconverter or the AC system accident as a cause of detected overcurrent, by detecting input currents and output currents of a cycloconverter connected to the secondary side of an inductor so as to monitor its deviation. CONSTITUTION:At the time of an AC system accident, the current value INN which is obtained through a detector 22 on the input side of a cycloconverter becomes almost the same wave shape as that of output side current value IOUT, so that output ALPHAI of a comparator 19 becomes almost zero. On the other hand, at the time of cyclone converter commutation failure, since a thyristor convertor 151 on the positive connection side of the cycloconverter and a thyristor converter 152 on the reverse connection side open their gates at the same time, they constitute a closed circuit, and over-current flows to a current detector 22 and IOUT becomes nearly zero at a current detector 11. For this reason, the output I of a comparator 19 becomes a large negative value and at the point that exceeded the judgement value, the main engine stop instruction ST is issued by a monitor 20.

13. 发明专利

JPH01231698A AC EXCITING GENERATOR MOTOR APPARATUS 失效
公开(公告)号：JPH01231698A
公开(公告)日：1989-09-14
申请号：JP5551888
申请日：1988-03-09
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： BANDO AKIRA , NAGURA OSAMU , KAYUKAWA SHIGEHIRO , SHIOZAKI JUNICHI , MOMIYAMA AKIRA , NAKAGAWA HIROTO , ONO YASUTERU
IPC分类号： H02P9/14 , H02H7/06 , H02P9/00 , H02P9/10 , H02P9/42
摘要： PURPOSE:To prevent the armature frequency of an AC exciting synchronous machine from abruptly increasing by applying a correction signal for suppressing a slip frequency to a predetermined value to an effective power controller when the slip frequency exceeds a set value. CONSTITUTION:A phase detector 9 detects a slip phase thetas between the voltage phase thetav of an AC power system 1 and the rotary phase thetar of an AC exciting synchronous machine. An exciting current controller 14 controls the secondary side current of the machine 5 on the basis of a vertical axis current command Id, a lateral axis current command Iq and the slip phase thetas. On the other hand, a slip frequency fs represented by the difference between a system frequency and a rotary frequency is applied to a dead zone calculator 28 and a primary delay calculator 29 thereby to obtain a power correction signal P0. An automatic effective power controller 20 and an automatic voltage controller 21 output current commands Iq, Id according to a power deviation and a voltage deviation.

14. 发明专利

JPH01160363A CONTROLLER FOR CYCLOCONVERTER 失效
公开(公告)号：JPH01160363A
公开(公告)日：1989-06-23
申请号：JP31768687
申请日：1987-12-16
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： ITO AKIO , SAWA SHUSUKE , SUGISAKA HIROSHI , KITA EIZO , NAKAGAWA HIROTO , ONO YASUTERU
IPC分类号： H02M5/27
摘要： PURPOSE:To effectively operate a cycloconverter by locking a gate operation signal for positive and negative thyristor groups at a synchronizing speed, and releasing the lock when it releases its synchronizing speed. CONSTITUTION:A controller is composed of a current deviation amplifier 101, a current constant control(ACR) arithmetic logic circuit 102, a gate shift phase generator 103, an automatic pulse phase shifter(APPS)110P-110N, a current command zero detector 104, a polarity discrimination flip-flop 105, a feedback current detector 106, AND elements 114-117, ON delay timers 107P-107N, etc. AND elements 214, 216-217, a delay timer 215, gate flip-flops 218-219, switches 220-221 are added, and a detector 222 at the time of synchronizing speed, a controller 223 for releasing the lock of the gate operation signal are composed. Thus, after a detected predetermined period of time, the gate operation signal is locked, and the lock is released after it is released from the synchronizing speed.

15. 发明专利

JPS6447297A GENERATOR-MOTOR 失效
公开(公告)号：JPS6447297A
公开(公告)日：1989-02-21
申请号：JP20170987
申请日：1987-08-14
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： BANDO AKIRA , NAGURA OSAMU , SAITO KEIJI , MIYASHITA IKURO , NAGAI HAJIME , NAKAGAWA HIROTO , ONO YASUTERU
IPC分类号： H02P9/00 , H02H7/06
摘要： PURPOSE:To make the current capacity of a system side breaker small by leading an excitation circuit for a secondary winding from an intermediate point between a synchronizing breaker connected in series with the primary winding of a generatormotor and said system side breaker. CONSTITUTION:A main circuit 100, in which a synchronizing breaker 4, a system side breaker 19 and a main transformer 20 are connected in series with each other, is provided between the primary winding 5-1 of an AC exciting generator- motor 5 and an electric system bus 1. Further, an excitation circuit 200 including a frequency converter 7 is provided between the intermediate point 3 of two breakers 4 and 9 of the main circuit 100 and the secondary winding 5-2 of the AC exciting generator motor 5. Thus, it is sufficient that the system side breaker 19 can break an incoming accidental current from the electric system 1 and the synchronizing breaker 4 can remove an accidental current from the generator-motor 5. Therefore, the capacities of these breakers can be made small.

16. 发明专利

JPH04121060A SEMICONDUCTOR POWER CONVERSION SYSTEM 失效
公开(公告)号：JPH04121060A
公开(公告)日：1992-04-22
申请号：JP23954890
申请日：1990-09-10
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： BANDO AKIRA , TANAKA CHIKARA , SAITO KEIJI , KAWAI TADAO , KITA EIZO , MIHASHI KEIICHI , ONO YASUTERU , NAKAGAWA HIROTO
IPC分类号： H02H7/12 , H02H7/125 , H02M7/12 , H02M7/155 , H02M7/162
摘要： PURPOSE:To shorten stop time and to restart by providing a short circuit switch on the DC output side of a bridge circuit constituting a power converter circuit, and by closing the short circuit switch and stopping firing the semiconductor controlling elements of the bridge circuit when commutation failure of the bridge circuit is detected. CONSTITUTION:A commutation failure detected signal CFD is held for a set time Ts by an off-delay timer 154, and outputted as a firing preventing signal GB. The time Ts is set longer than the turn off time of thyristors TY1-TY6, and commutation failure is surely finished. Besides, the commutation failure detected signal CFD is held for a set time Tp by an off-delay timer 155, and outputted as a short circuit command GTP to a short circuit switch TYSP. The time Tp is set longer than the sum of the turn on time of the short circuit switch TYSP and the operation delay time of a gate control circuit 13a, and short-circuiting operation is surely started. The firing preventing command GB is transmitted to a gate control circuit 12, and prevents the firing of the thyristors TY1-TY6 collectively.

17. 发明专利

JPH0360400A EXCITING DEVICE FOR VARIABLE SPEED GENERATING MOTOR 失效
公开(公告)号：JPH0360400A
公开(公告)日：1991-03-15
申请号：JP19624389
申请日：1989-07-28
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SAWA SHUSUKE , SUGISAKA HIROSHI , KITA EIZO , ONO YASUTERU , KATSUSAKA SATOSHI
IPC分类号： H02P9/00 , H02H7/06
摘要： PURPOSE:To prevent voltage rise instantaneously at the time of power supply cutoff by judging whether the voltage rise can be suppressed or not from the deviation be tween a voltage instruction value and a voltage detection value and the AVR integral value when a power system has been cutoff. CONSTITUTION:Automatic voltage adjuster(AVR) 16 is equipped with a means 22, which detects the cutoff of a power system 5, a means 21, which judges the polarity of the deviation Vg between an output voltage instruction and a detected value Vg, a means 23, which judges the polarity of the current instruction of current ingredients Id in the direction of magnetic flux, and a means 25, which inverts the polarities of the output voltage instruction and the detected value according to the outputs of the cutoff detection means 22, the polarity judging means 21, and the means 23 for judging the polarity of current instruction in the direction of magnetic flux. And the voltage is automatically controlled based on the inverted deviation. That is, this ts equipped with an AND circuit 24, which seeks the logical product of the outputs of comparators 21-23 by each mean, a switch 25, which changes over the polarity of the voltage deviation Vg by the output of the AND circuit 24, and others. Hereby, the voltage rise of a generator at the time of power system cutoff can be suppressed.

18. 发明专利

JPH02262832A SEMICONDUCTOR POWER CONVERSION SYSTEM 失效
公开(公告)号：JPH02262832A
公开(公告)日：1990-10-25
申请号：JP6839189
申请日：1989-03-20
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： BANDO AKIRA , TANAKA CHIKARA , SAITO KEIJI , KAWAI TADAO , KITA EIZO , MIHASHI KEIICHI , ONO YASUTERU , NAKAGAWA HIROTO
IPC分类号： H02H7/12 , H02H7/122 , H02H7/125 , H02M7/162 , H02P9/00
摘要： PURPOSE:To prevent spread of fault by judging that the abnormality is caused by a fault of machinery, such as short circuit of an element, if AC input current of bridge constituting a power conversion circuit is larger than output current and executing emergency stop thereby quickening detection of fault of machine in a semiconductor power conversion system. CONSTITUTION:If the current difference I1 is larger than a set value, a comparator 14 blocks gate signals to be fed from thyristors TY1-TY6 by means of a gate block command circuit 12 while simultaneously makes judgement whether a thyristor short circuit switch 4 is fired or not by means of a short circuit command circuit 13. If voltage V drops upto the time t1-t5 and overcurrent flows at DC side, commutation failures have occurred at times t2, t3, t4 and the current difference I1 have varied but since the sign is minus the comparator 14 does not function and since the voltage is reset to V at t6 commutation failure is finished and normal operation takes place.

19. 发明专利

JPH01243897A AUTOMATIC PARALELLING DEVICE FOR VARIABLE-SPEED POWER GENERATING SYSTEM 失效
公开(公告)号：JPH01243897A
公开(公告)日：1989-09-28
申请号：JP6956488
申请日：1988-03-25
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KANO YOSHIAKI , SUGISAKA HIROSHI , WATANABE MANABU , KITA EIZO , NAKAGAWA HIROTO , ONO YASUTERU
IPC分类号： H02P9/00
摘要： PURPOSE:To enable synchronous paralelling, by providing a circuit for correcting the phases of system voltage and generator voltage and a circuit for regulating the system voltage and the generator voltage uniformly. CONSTITUTION:A constant voltage operating unit 13, a phase detector 14 and a voltage regulation operating unit 16 in a reactive component operating unit 18 output a voltage difference signal Id, a phase difference signal theta and a reactive component difference signal Id based on the system voltage VL and the generator voltage Vg. A phase difference correction operating unit 15 for current operating units 12-1-12-3 outputs secondary induction voltage having corrected phase difference based on the secondary induction voltage of an induction generator 1 and a phase difference signal theta. An exciting current command operating unit 19 controls a cyclo-converter 3 connected to the secondary of the induction generator 1 based on the corrected secondary induction voltage, the voltage difference signal Id and the reactive component difference signal Id.

20. 发明专利

JPH01243896A FREQUENCY CONTROLLER FOR VARIABLE-SPEED GENERATOR MOTOR 失效
公开(公告)号：JPH01243896A
公开(公告)日：1989-09-28
申请号：JP6956088
申请日：1988-03-25
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KANO YOSHIAKI , KATO KOJI , SAWA SHUSUKE , WATANABE MANABU , MINATO MASAHIRO , NAKAGAWA HIROTO , ONO YASUTERU
IPC分类号： H02P9/00
摘要： PURPOSE:To stabilize the frequency of power system, by calculating increment/ decrement of load based on the difference between the frequency of power system and a reference frequency and controlling the phase of AC exciting current to be fed to the rotor winding. CONSTITUTION:A constant effective power controller 12 and a constant reactive power controller 13 output a difference signal between an effective set power P0 and an effective power P1 and a difference signal between a reactive set power Q0 and a reactive power Q1 respectively. A current pattern operating section 8 controls a cyclo-converter 6 connected to the secondary corresponding to the secondary induction voltage of a generator motor 3 outputted from a slip detector 4, the effective power difference signal and the reactive power difference signal. An automatic frequency controller 14 corrects the effective power P0 corresponding to the difference between a reference frequency f0 and the system frequency f1. By such arrangement, frequency of power system can be stabilized.

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