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1. 发明专利

JPH0542236B2 失效
公开(公告)号：JPH0542236B2
公开(公告)日：1993-06-25
申请号：JP19369386
申请日：1986-08-19
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： ITO AKIO , SAWA SHUSUKE , SUGISAKA HIROSHI , HAYASHI SHIGEAKI , NAKAGAWA HIROTO , OONO YASUTERU
IPC分类号： H02P9/00 , H02H7/06 , H02J3/00

2. 发明专利

JPH03155398A METHOD AND APPARATUS FOR EXCITING VARIABLE SPEED PUMPING-UP GENERATOR MOTOR 失效
公开(公告)号：JPH03155398A
公开(公告)日：1991-07-03
申请号：JP28890789
申请日：1989-11-08
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SAWA SHUSUKE , ITO AKIO , HARASHIMA TOSHIHIKO , SUGISAKA HIROSHI , OURA MASAO , NAKAGAWA HIROTO , KATSUSAKA SATOSHI
IPC分类号： H02P9/00 , H02H7/06
摘要： PURPOSE:To suppress a malfunction due to an output voltage rise by detecting a cutoff when a power system is cut OFF, and reducing the exciting currents of secondary windings combined in vectors. CONSTITUTION:When a power system is cut OFF, an output voltage VG is abruptly raised. On the other hand, a power regulator 18 and a voltage regulator 19 starts operating in a direction for increasing a torque current component Iq in such a manner that the detected value PL of a feedback value of an effective power control becomes zero, and starts operating in a direction for decreasing a magnetic flux direction current component Id due to an increase in an output voltage VG. Then, when a load cutoff is detected, a flip-flop 20 is set, and a torque current component Iq becomes a set value. Thus, an exciting current is momentarily reduced, and the voltage VG starts falling. Thereafter, the voltage VG is held at a command value by the function of the regulator 19 to continue stable operation.

3. 发明专利

JPH01270799A METHOD OF CONTROLLING VARIABLE SPEED PUMPING-UP SYSTEM 失效
公开(公告)号：JPH01270799A
公开(公告)日：1989-10-30
申请号：JP9673188
申请日：1988-04-21
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SUGISAKA HIROSHI , SAWA SHUSUKE , ITO AKIO , UNO SEINOSUKE , ONO YASUTERU
IPC分类号： F03B15/08 , H02P9/00 , H02P9/04 , H02P9/14
摘要： PURPOSE:To stably shift a pump to a normal operation by adding a correction value responsive to the runner hydraulic pressure of a pump water wheel to a command value of an exciting current on the secondary side of an AC machine. CONSTITUTION:A secondary exciting AC machine 1 is started in a state that a water surface in a suction tube 4b is pressed down by a water surface pressing command A. When a pumping is started, the command A is released, and the water surface level in the tube starts rising. Even if the water surface is raised, a runner 4a is brought into contact with water, and a guide vane 4c is further opened, a runner water pressure capable of pumping the water to an upper dam is established. In this case, a runner water pressure signal W varying in response to a resistive torque of the rubber 4a is detected by a pressure detector 8, an input command correction signal Pep based on it is added to a value Peo.

4. 发明专利

JPS62181698A CONTROLLING DEVICE FOR VARIABLE-SPEED GENERATING SYSTEM 失效
公开(公告)号：JPS62181698A
公开(公告)日：1987-08-10
申请号：JP2316286
申请日：1986-02-05
申请人： KANSAI ELECTRIC POWER CO , HITACHI LTD
发明人： SUGIMOTO OSAMU , KATO TADAATSU , SAWA SHUSUKE , ITO AKIO , SUGISAKA HIROSHI
IPC分类号： H02J3/24 , H02P9/00 , H02P9/14
摘要： PURPOSE:To ensure stable control and the stabilization of system frequency by vector-synthesizing an effective-current component value and a reactive-power component value and acquiring a secondary exciting current command and controlling power by the command. CONSTITUTION:An effective current component is obtained from a deviation between an effective power value on the primary side of a main transformer 4 and an effective-power command value by an effective component computing element 7, and a reactive current component is acquired from a deviation between a reactive power value on the primary side of the main transformer 1 and reactive-power command value by a reactive component computing element 8. Current controllers 12-1-12-3 synthesize the effective current component and the reactive current component obtained, and output an exciting current command transmitted over a secondary winding for a wound-rotor type induction generator 1 to cycloconverters 3-1-3-3.

5. 发明专利

JPH05111297A VARIABLE SPEED GENERATOR MOTOR SYSTEM AND LOAD INTERRUPTION DETECTING METHOD FOR VARIABLE SPEED GENERATOR MOTOR 失效
公开(公告)号：JPH05111297A
公开(公告)日：1993-04-30
申请号：JP26215391
申请日：1991-10-09
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SAWA SHUSUKE , HARASHIMA TOSHIHIKO , ITO AKIO , NISHI YOSHINORI , KUZUSAKA SATOSHI , NAKAGAWA HIROTO
IPC分类号： H02P9/00
摘要： PURPOSE:To provide a highly reliable interruption detector and detecting method for variable speed generator motor in order to suppress voltage rise of a generator motor upon interruption of primary system. CONSTITUTION:The system interruption detecting method for monitoring excessive difference between a secondary exciting current command Iref and an actual exciting current IFB comprises a filter 51 for damping a frequency component corresponding to the rotational speed in a detected value of the actual exciting current IFB in order to make a discrimination against disturbance at the time of system fault, and a comparator 52 for making a comparison with a set value 54.

6. 发明专利

JPH0467800A METHOD AND APPARATUS FOR CONTROLLING REVERSIBLE GENERATOR 失效
公开(公告)号：JPH0467800A
公开(公告)日：1992-03-03
申请号：JP17789490
申请日：1990-07-05
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SAWA SHUSUKE , HARASHIMA TOSHIHIKO , ITO AKIO , SUGISAKA HIROSHI , KITA EIZO , KUZUSAKA SATOSHI , NAKAGAWA HIROTO
IPC分类号： H02P9/04
摘要： PURPOSE:To enable suppressing the deviation between the input energy and output energy of a variable speed generator, even if a generating quantity command changes, by detecting the generating quantity and rotational speed of the variable speed generator, by obtaining the deviation between the detected generating quantity and the generating quantity command and by generating an exciting current command for suppressing the deviation to zero. CONSTITUTION:The optimum rotational speed command N0 changes from N01 to N02 as the generating quantity command P0 increases. Further, the optimum guide vane opening command Y0 changes from Y01 to Y02, and a guide vane correction value nap is added to this optimum guide vane opening command. That is, a guide vane opening Y is controlled according to characteristic Y3 obtained by addition of the guide vane correction value Y0 to characteristic Y2. Therefore, because a feedwater quantity to a water wheel 12 is immediately increased according to the increase of the generating quantity command P0, the output energy of the water wheel 12 can be increased according to the increase of the output power of a generator 10 and the generator 10 can be prevented from deviating from a variable speed operating range. Accordingly, even if the generating quantity command P0 increases abruptly, it is possible to continuously operate the generator in a stable state.

7. 发明专利

JPH0454899A METHOD FOR EXCITING VARIABLE SPEED GENERATOR OR MOTOR AND APPARATUS THEREOF 失效
公开(公告)号：JPH0454899A
公开(公告)日：1992-02-21
申请号：JP16198790
申请日：1990-06-20
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： ITO AKIO , SAWA SHUSUKE , HARASHIMA TOSHIHIKO , KITA EIZO , OURA MASAO , NAKAGAWA HIROTO , ONO YASUTERU
IPC分类号： H02J3/38 , H02H7/06 , H02P9/00 , H02P21/22 , H02P23/00 , H02P27/04 , H02P27/05
摘要： PURPOSE:To suppress the output voltage of a generator from increasing just after an electric power system is breaked, by monitoring the change of an exciting current generated when the electric power system is breaked or a system current is changed rapidly, and by sensing the break or rapid change of a load, and by restricting the exciting current of a secondary winding which is synthesized in such manner as a vector. CONSTITUTION:At a time t1, a deviation I of a sensed value If of an exciting current, which is reduced owing to an armature reaction, from a command value I2 of the exciting current, exceeds a fixed value. This is sensed by a comparator 27, and thus, the break of a load is sensed. Thereby, a change-over switch 55 cams into ON-state, and from a compensating circuit 54, its output Ic= I is outputted. By a subtracter 50, the output Ic (= I) is subtracted from the command value I2 of the exciting current. Accordingly, the input current value to a subtracter 51 is nearly equalized to the sensed value If of the exciting current. As a result, the deviation I comes into about zero, and the output of a current control computing element 23 itself is not changed too. Thereby, the sensed value If of the exciting current is restricted too, and a generator voltage VG is suppressed from increasing rapidly.

8. 发明专利

JPH0265697A CONTROLLER FOR VARIABLE SPEED GENERATOR MOTOR 失效
公开(公告)号：JPH0265697A
公开(公告)日：1990-03-06
申请号：JP21367688
申请日：1988-08-30
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SAWA SHUSUKE , ITO AKIO , SUGISAKA HIROSHI , KASHIWAZAKI HIROSHI , KANO TAKASHI , TANAKA CHIKARA , KITA EIZO , NAKAGAWA HIROTO , ONO YASUTERU
IPC分类号： H02P9/00 , H02H7/06
摘要： PURPOSE:To continue a safe operation by gate-shifting positive and negative side thyristor converters connected in anti-parallel with secondary side phases of a generator motor when the converters are not, even if gate-blocked, arc- extinguished. CONSTITUTION:The secondary side of a variable speed generator motor (variable speed) 1 is connected to a main transformer 4 by a cycloconverter (CYC) 3i (i=1-3) and an exciting transformer 7i, and a converter current Ifbi is detected by a CT. A voltage detector 14i detects a voltage between the anode and the cathode of a thyristor of the CYC3i, and a voltage establishment signal VFD is detected by its logic product. Phase exciting current commands Iref-i of a secondary winding is calculated by a phase signal theta from a phase detector 6 coupled directly to the motor 1 and a slip frequency Sf. The pulse phase shifter 10 of a control circuit 9a calculates and outputs a gate control signal with signals VFD, Ifb-i and Iref-i, and shifts the gate pulse of the CYC 3i failed in arc extinguishing. Thus, a stable operation is continued.

9. 发明专利

JPH01243898A DEVICE FOR EXCITING VARIABLE-SPEED AC GENERATOR/MOTOR 失效
公开(公告)号：JPH01243898A
公开(公告)日：1989-09-28
申请号：JP6956788
申请日：1988-03-25
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： ITO AKIO , SAWA SHUSUKE , SUGISAKA HIROSHI , MOMIYAMA AKIRA , KATO KOJI , KAMIYA KENJIRO , KITA EIZO , UNO SEINOSUKE , ONO YASUTERU
IPC分类号： H02P9/00 , H02H7/06 , H02P9/14
摘要： PURPOSE:To suppress voltage rise upon interruption of power system or load, by regulating the effective power control signal corresponding to the difference between an effective power command and an effective power based on a voltage control signal and an output voltage from an AC variable speed generator/ motor. CONSTITUTION:A constant effective power controller 8 outputs a torque directional component current control signal 105 based on the difference between an effective power command 103 and an effective power 102. A constant voltage controller 9 outputs a flux directional component current control signal 106 corresponding to the difference between a voltage command 104 and an output voltage 101. Current controllers 12a-12c control cyclo-converters 3a-3c connected to the secondary corresponding to the phase of secondary induced voltage of an AC variable speed generator motor 1 outputted from a reference signal operating circuit 10, the torque directional component current control signal 105 and the exciting direction component current control signal 106.

10. 发明专利

JPH01243895A EXCITING METHOD AND DEVICE FOR VARIABLE SPEED PUMPED STORAGE GENERATOR/MOTOR 失效
公开(公告)号：JPH01243895A
公开(公告)日：1989-09-28
申请号：JP6778388
申请日：1988-03-22
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SAWA SHUSUKE , SUGISAKA HIROSHI , ITO AKIO , KITA EIZO , ONO YASUTERU
IPC分类号： H02P9/00 , H02P9/14
摘要： PURPOSE:To suppress output voltage rise, by reducing and correcting the torque current component based on the increment of output voltage when the power system is interrupted. CONSTITUTION:A power controller 15 outputs a torque current component Iq and a flux direction current Id corresponding to the difference between an effective power command P0 and a detected power PL and the difference between an output voltage command V0 and a detected output voltage VG. An exciting current controller 14 operates an exciting current command I2 based on the phase of secondary induction voltage, torque current component Iq and the flux direction current Id outputted from a reference signal computing circuit 13, and controls the secondary current of a generator-motor corresponding to the excitation current command I2. When the power system is interrupted and a value produced by multiplying a voltage difference signal by K decreases below the torque current component Iq corresponding to the power difference, the torque current component Iq is controlled corresponding to the voltage difference signal.

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