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1. 发明专利

JPH0662583A CONTROLLER AND SELF-EXCITED REACTIVE POWER COMPENSATOR OF POWER CONVERTER AND DC POWER TRANSMISSION SYSTEM 失效
公开(公告)号：JPH0662583A
公开(公告)日：1994-03-04
申请号：JP20906692
申请日：1992-08-05
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： ICHIKAWA FUMITOSHI , SUZUKI KENICHI , UEDA SHIGETA , MOTOBE MITSUSACHI , AIZAWA HIDETOSHI
IPC分类号： G05F1/44 , H02J1/00 , H02M7/537
摘要： PURPOSE:To enable distorted current to be detected with high precision by integrating one of excited currents which runs through only a distorted current generation period and by suppressing a distorted amount according to its integral value. CONSTITUTION:Pulse signals PKP, PKN are outputted sequently from a gain adjuster 56 in response to generation of positive and negative gate pulses predicted to be influenced by generation of the DC distorsion. On the other hand, the excited current i0 of a transformer is detected by an excited current detector 52 and multiplied by multipliers 62, 64 in response to the signals PKP, PKN. Its multiplication values are integrated by integrators 66, 68, respectively, and integral values SP, SN are held until reset signal R is generated, where these integral values SP, SN are added by an adder 70 to obtain deviation DELTAS. Next, the deviation DELTAS is sample-held by a sample holder 72 at a predetermined timing to obtain differential signal DELTASh. Correction widths DELTAOP, DELTAON orresponding to polarity and level of the differential signal DELTASh are obtained by gain elements 74, 76, so that respective switching angles OP1, PN1 are corrected.

2. 发明专利

JPH044755A SELF-EXCITED CONVERTER USING NORMALLY ON THYRISTOR 失效
公开(公告)号：JPH044755A
公开(公告)日：1992-01-09
申请号：JP10454190
申请日：1990-04-20
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： WAKASUGI KENJI , KAWAI TADAO , TOKIWA YUKIO , ICHIKAWA FUMITOSHI
IPC分类号： H02H7/12 , H02M7/12 , H02M7/155 , H02M7/162
摘要： PURPOSE:To surely prevent short-circuiting of a normally ON thyristor at the time of starting conversion to enable applying the normally ON thyristor to an AC/DC converter, especially to a high-voltage-converter by turning OFF only a series switch prior to operating a breaker through adding the switch to the arm of the normally ON thyristor. CONSTITUTION:At the time of starting conversion, all switches 7 are turned OFF and then a breaker 1 is closed. In this case, electric current does not flow through the arm of normally ON thyristors 2. In gate pulse amplifiers 3, power is established by the current flowing through diodes 4 to control all normally ON thyristors 2 to OFF, immediately after the breaker 1 is closed. Accordingly, AC voltage is applied to both ends of each normally ON thyristor 2 and a converter is placed in a starting state. Because the power supply of the gate pulse amplifiers 3 is a charging type, the switching operation of the switch 7 is unnecessary after the gate power supply has been once established so that a normal operation as AC/DC converter is made possible.

3. 发明专利

JPH0799779A CONTROLLING DEVICE FOR SELF-EXCITED TYPE POWER CONVERSION DEVICE 失效
公开(公告)号：JPH0799779A
公开(公告)日：1995-04-11
申请号：JP24146493
申请日：1993-09-28
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： KONISHI HIROO , KAWAZOE HIROSHIGE , SUZUKI KENICHI , NAKAJIMA TATSUTO , ICHIKAWA FUMITOSHI
IPC分类号： H02M7/155 , H02M7/12
摘要： PURPOSE:To execute a high-speed control and also to suppress occurrence of an overcurrent due to a ground fault accident by a method wherein a three-phase AC voltage and a three- phase alternating current are converted into coordinate systems of two axes of alphabeta respectively so as to determine an instantaneous actual power and an instantaneous virtual power, these powers are divided by the amplitude of the AC voltage and thereby the current converted into a two-axes coordinate system of (dq) is determined. CONSTITUTION:A deviation of an output of an operational amplifier 33 which computes and amplifies a deviation of a current command value Iqp of an axis (q) from a current value Iq of an AC system of dq-system coordinates, from an output of a multiplier 34 which multiplies a current value Id by an impedance of a transformer 4, is determined by an adder 35. Besides, an output of an operational amplifier 37 which computes and amplifies a deviation of a current command value Idp of an axis (d) from the current value Id of the AC system of the dq-system coordinates, an output of a multiplier 38 which multiplies the current value Iq by the impedance of the transformer 4 and a bias signal V0 are added up by an adder 39. Outputs of these adders 35 and 39 are converted inversely into an alphabeta coordinate system by a converter 40 and further transformed into three-phase values by a conversion circuit 41, and a switching element of a power conversion device 5 is controlled by a PWM circuit 42.

4. 发明专利

JPH06217462A STARTING SYSTEM FOR REACTIVE POWER CONTROLLER 失效
公开(公告)号：JPH06217462A
公开(公告)日：1994-08-05
申请号：JP347293
申请日：1993-01-12
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO
发明人： KIZAWA TAKASHI , ICHIKAWA FUMITOSHI , SUZUKI KENICHI
IPC分类号： G05F1/70 , H02J3/18
摘要： PURPOSE:To suppress overcurrent at the time of starting a self-excited reactive power controller connected with a power system in order to stabilize the system. CONSTITUTION:An active power P command 21 and a reactive power Q command 22 delivered from an inverter are fed to start limiters 7, 8 and then a system voltage 6 is applied to an adder 9. Consequently, unnecessary overcurrent is suppressed and unnecessary function of overcurrent relay is prevented.

5. 发明专利

JPH06261549A VOLTAGE SELF-EXCITED CONVERSION SYSTEM 失效
公开(公告)号：JPH06261549A
公开(公告)日：1994-09-16
申请号：JP4905393
申请日：1993-03-10
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： ICHIKAWA FUMITOSHI , YOSHINO TERUO
IPC分类号： H02M7/155 , H02H7/125 , H02M7/12 , H02M7/162 , H02M7/525
摘要： PURPOSE:To obtain a title system which can safely protect and stop a voltage self-excited power converter without raising DC voltage. CONSTITUTION:This system comprising at least a line linkage transformer 3, a power converter 1 made up of self-extinguishing devices and reverse parallel diodes, and a DC capacitor 2 is provided with a protective relay element which protects and stops the power converter 1 from an operation state and a first protection circuit 21 which turns on self-extinguishing devices connected to the + side DC bus P of the power convertor 1 when this protective relay element acts. It further comprises a second protection circuit 22 which turns off self-extinguishing devices connected to the-side DC bus N of the power converter 1 when the protective relay element acts.

6. 发明专利

JPH02174562A VOLTAGE TYPE CONVERTER 失效
公开(公告)号：JPH02174562A
公开(公告)日：1990-07-05
申请号：JP32977388
申请日：1988-12-27
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： TOKIWA YUKIO , ICHIKAWA FUMITOSHI , ITO KATSURO
IPC分类号： H02H7/122 , H02M7/493
摘要： PURPOSE:To protect a semi-conductor element from breakdown by magnetically coupling first and second conductors connected each other with reverse polarity and operating converters in phase at high and low potential sides. CONSTITUTION:First conductor 12 connecting between one end of a high potential side capacitor having the other end connected with positive pole and the negative pole of the high potential side converter 9 is magnetically coupled with second conductor 13 connecting between one end of a low potential side capacitor 5 having the other end connected with the negative pole of the low potential side converter 10 and the positive polarity of the low potential side converter 10, where the high potential side converter 9 and the low potential side converter 10 are operated in phase. The conductors 12, 13 function as normal connecting conductors during steady operation. If trouble occurs, the capacitors 2, 5 are discharged through the conductors 12, 13, and the conductors 12, 13 function as reactors and suppress di/dt of discharge current.

7. 发明专利

JPH11103527A HIGHER HARMONICS COMPENSATING SYSTEM 失效
公开(公告)号：JPH11103527A
公开(公告)日：1999-04-13
申请号：JP26297497
申请日：1997-09-29
申请人： TOKYO ELECTRIC POWER CO , MEIDENSHA ELECTRIC MFG CO LTD
发明人： ICHIKAWA FUMITOSHI , MIYAZAKI SATOSHI , SHIMOMURA JUNICHI
IPC分类号： H02J3/01 , H02J3/18
摘要： PROBLEM TO BE SOLVED: To correct and surely compensate amplitude and phase by detecting k-th higher harmonics current without delays. SOLUTION: A k-th higher harmonics constituent of a load current detected by a current transformer CT1 is converted into a DC part with a three-phase/kω coordinate transformer 22, which rotates with a value kω obtained by multiplying the k-th higher harmonics with a degree k and power source angular frequency, and the rest of the constituents into an AC part. The DC part is extracted with low-pass filters 23, 24 and converted with a kω/three-phase coordinate transformer 25, which rotates with the value kω for detecting three-phase k-th higher harmonics. Since control cycle, delays in current detection by CT and delay in current control exist, amplitude and phase are each corrected for the k-th higher harmonics current with a amplitude/ phase correcting circuit 27 after the three-phase k-th higher harmonics is converted into the k-th higher harmonics current of dq axis with a three-phase/dq coordinate transformer 26. Then, it is converted into three-phase k-th higher harmonics current, whose amplitude and phase are corrected with a dq/three-phase coordinate transformer 28. The k-th higher harmonics current of a three-phase power source is corrected by PWM control, in such a way that the deviation between the k-th higher harmonics current and the output current of an inverter 10 becomes zero.

8. 发明专利

JPH02174553A ELECTROSTATIC INDUCTION THYRISTER CONVERTER 失效
公开(公告)号：JPH02174553A
公开(公告)日：1990-07-05
申请号：JP32977488
申请日：1988-12-27
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： TOKIWA YUKIO , ICHIKAWA FUMITOSHI , ITO KATSURO
IPC分类号： H02M1/00
摘要： PURPOSE:To prevent shortcircuit fault upon throw-in of main circuit by throwing a main circuit circuit breaker in based on an AND condition of an output signal from a circuit for judging application of reverse bias voltage more than a predetermined times and a main circuit circuit breaker throw-in command signal. CONSTITUTION:LEDs 18a, 18b emit light normally because of reverse bias voltage higher than a predetermined level, and optical signals are fed to photoe lectric converters 9a, 9b where the optical signals are converted into reverse bias signals which is then fed to a judging circuit 19. Since all reverse bias signals are normally '1', output from the judging circuit 19 is '1'. Upon provi sion of a main circuit breaker throw-in command, an AND gate 20 produces '1' output because the output signal from the judging circuit 19 is '1' and the circuit breaker throw-in command is fed to a circuit breaker 23 thus throw ing in the circuit breaker 23. By such arrangement, shortcircuit fault can be prevented upon application of voltage onto the main circuit.

9. 发明专利

JPH02155435A CONTROLLER FOR SYSTEM DC INTERLOCKING DEVICE 失效
公开(公告)号：JPH02155435A
公开(公告)日：1990-06-14
申请号：JP27793388
申请日：1988-11-02
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： TOKIWA YUKIO , ICHIKAWA FUMITOSHI , NAKAMURA NAOMI , INOGUCHI HARUHISA , HIROSE SHUNICHI
IPC分类号： H02J3/38 , H02J3/36 , H02M7/12 , H02M7/155 , H02M7/48
摘要： PURPOSE:To drive a remaining converter without stopping even if one converter of interlocking operation is stopped due to its trouble, etc., and to easily invert a tide by controlling effective power constantly by voltage source type self-excited converters. CONSTITUTION:When the selector 93 of voltage source type self-excited converters 110, 210 of interlocking operation selects a maximum value, the converter 110 in which a DC voltage reference difference is added to a DC voltage reference Edp controls a DC voltage constantly under DC voltage constant control, and the other converter 210 in which the DC voltage reference difference is not added controls effective power constantly under effective power constant control. When the selector 93 of the converters 110, 210 of the interlocking operation selects a minimum value, the converter 210 in which the DC voltage reference difference is subtracted from the DC voltage reference Edp controls the DC voltage constantly under the DC voltage constant control, and the other converter 110 in which the DC voltage reference difference is not subtracted controls the effective power constantly under the effective power constant control.

10. 发明专利

JPH01235413A ABNORMALITY DETECTION CIRCUIT FOR ELECTROSTATIC INDUCTION THYRISTOR CIRCUIT 失效
公开(公告)号：JPH01235413A
公开(公告)日：1989-09-20
申请号：JP6025788
申请日：1988-03-16
申请人： TOKYO ELECTRIC POWER CO , TOSHIBA CORP
发明人： TOKIWA YUKIO , ICHIKAWA FUMITOSHI , ITO KATSURO
IPC分类号： H03K17/73 , H03K17/00
摘要： PURPOSE:To easily and securely detect the abnormality of an off gate circuit and the fault of a thyristor circuit itself at low cost and to operate a protection circuit by providing an exclusive OR circuit of an off gate command signal and the output signal of a voltage detection circuit. CONSTITUTION:The voltage detection circuit 12 which detects that a voltage between the gate G of the electrostatic induction thyristor 1 and a cathode K is below a reference voltage is provided, the exclusive OR circuit 18 takes the exclusive OR of a voltage detection signal (b) being the output of the voltage detection circuit 12 and an off pulse signal (a), and the output is set to a fault signal (d), whereby the protection circuit 20 executes an appropriate protection action when the fault signal (d) shows '1'. Thus, the bias voltage monitor of the electrostatic induction thyristor 1 and the fault of the thyristor itself can be realized by the simple circuit and at low cost, and the protection circuit 20 can be operated.

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