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1. 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.

2. 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

3. 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.

4. 发明专利

JPH0576278B2 失效
公开(公告)号：JPH0576278B2
公开(公告)日：1993-10-22
申请号：JP7812886
申请日：1986-04-07
申请人： KANSAI ELECTRIC POWER CO , HITACHI LTD
发明人： HARAGUCHI EIJI , NAKAGAWA HIROTO , NOHARA GOO , GOTO MASUO
IPC分类号： H02J3/00 , H02P9/00 , H02P9/04 , H02P9/14

5. 发明专利

JPH03256599A GENERATOR UNIT FOR POWER SYSTEM SIMULATION 失效
公开(公告)号：JPH03256599A
公开(公告)日：1991-11-15
申请号：JP5169990
申请日：1990-03-05
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： NOHARA GOO , GOTO MASUO , YOSHIDA HIROTAKA , SUZAKI SHIRO
IPC分类号： H02J3/00 , H02P9/00
摘要： PURPOSE:To establish synchronism pull-in conditions in early stage by controlling the inner voltage of a generator unit according to the voltage difference and the frequency difference between the generator side and the system side. CONSTITUTION:A control unit CU is provided with signals from a potential transformer PTS arranged on the system S side wiring and a potential transformer PTG arranged on the generator unit G side wiring. When the voltage difference between the generator side and the system side is lower than a predetermined value, a command is provided to the generator unit G based on a command fed from an operating end Ta while simultaneously a throw-in command is provided to a circuit breaker CB. When the voltage difference exceeds the predetermined value, phase difference between the generator side and the system side is calculated and transmitted to the generator unit G thus performing synchronization control.

6. 发明专利

JPS6416223A INTER-SERIES CHECKING METHOD 失效
公开(公告)号：JPS6416223A
公开(公告)日：1989-01-19
申请号：JP17099187
申请日：1987-07-10
申请人： HITACHI LTD
发明人： NOHARA GOO , GOTO MASUO
IPC分类号： H02J3/38
摘要： PURPOSE:To improve the reliability, by transmitting/receiving power calculated respectively for two series and then obtaining an average level and selecting a generator to be interrupted based on the average level. CONSTITUTION:An average effective power between series A and B is calculated based on effective power C1A-C3A is series A and effective power C1B-C3B in series B. No control is made for an average frequency lower than a judging level. When the average frequency is higher than the judging level, an interruption signal is fed through a signal line C4A to a circuitbreaker CB1 if the absolute value of a difference between the average effective power and a comparison level is equal to or lower than the judging level so as to separate a generator G1 from the system. If the average effective power is lower than the comparison level, an interruption signal is fed through a signal line C5A to a circuitbreaker CB2 so as to separate a generator G2 from the system. If the average effective power is higher than the comparison level, an interruption signal is fed through a signal line C6A to a circuitbreaker CB3 so as to separate a generator G3 from the system. Consequently, the reliability can be improved.

7. 发明专利

JPS63285472A DETECTING DEVICE OF FREQUENCY 失效
公开(公告)号：JPS63285472A
公开(公告)日：1988-11-22
申请号：JP12159887
申请日：1987-05-19
申请人： HITACHI LTD
发明人： NOHARA GOO , GOTO MASUO
IPC分类号： G01R23/02 , H02H3/46
摘要： PURPOSE:To enable precise frequency detection even at a low sampling rate by measuring the period of a cycle of voltage on the basis of a time point where a sampled value has a sign opposite to the previous one. CONSTITUTION:The state of inversion of a sampling value is detected on the basis of an instantaneous sampling voltage information obtained by sampling a voltage which is an object of detection. When the inversion of the sign thereof is detected, a voltage at the intermediate time point of two sampling values a1 and a2 used for said detection is assumed. Next, an input information, that is, a zero point a'1 of the voltage is assumed by using the information used for the detection of the sign inversion and an information at the intermediate time point. Based on an information on detection of this zero point, subsequently, a zero point of a subsequent period is detected from a zero point of minus, and a 1/2 period of the voltage is determined. Then, the reciprocal number of this period is calculated, so as to determine a frequency.

8. 发明专利

JPS63188775A EFFECTIVE VALUE AND ELECTRIC POWER DETECTION SYSTEM 失效
公开(公告)号：JPS63188775A
公开(公告)日：1988-08-04
申请号：JP2041787
申请日：1987-02-02
申请人： HITACHI LTD
发明人： NOHARA GOO , GOTO MASUO
IPC分类号： G01R21/133 , G01R19/02 , H02H3/02
摘要： PURPOSE:To calculate an accurate effective value regardless of variation in system frequency by calculating the effective value, active power, and reactive power from two sampling data in time series. CONSTITUTION:Multiplication parts 301 and 302 calculates the products of sampled values i1 and v2, and v1 and i2 of a current and a voltage respectively, and a block 303 subtracts the output of the multiplication part 302 to find v2i1-i2v1. A division part 304, on the other hand, divides a variation DELTAf in frequency by a reference value f0 of frequency and multiplication parts 305-307 halve the outputs of the division part 304 and multiplication parts 305 and 307. Further, an addition part 308 adds the outputs of the multiplication parts 305-307, an addition part 309 adds '1' to the output of the addition part 308, and a block 310 halves the output of the addition part 309 to obtain sinomegaDELTAt. A division part 311, on the other hand, divides the output of the block 303 by the output of the block 310 to obtain the reactive power Q. Thus, the accu rate effective value is calculated.

9. 发明专利

JPS63136999A COMMAND VALUE CALCULATION METHOD FOR VARIABLE SPEED PUMPING-UP GENERATOR SYSTEM 失效
公开(公告)号：JPS63136999A
公开(公告)日：1988-06-09
申请号：JP28179786
申请日：1986-11-28
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： NOHARA GOO , GOTO MASUO , HARAGUCHI EIJI , NAKAGAWA HIROTO
IPC分类号： H02P9/14 , H02P9/00 , H02P9/04
摘要： PURPOSE:To reduce the capacity of a cycloconverter by altering a target speed in case that the target speed is near a zero slip at the time of AFC operation of generating and pumping-up and passing it through the vicinity of the zero slip in a short time. CONSTITUTION:A command value calculator 15 calculates the opening command value HV and a target speed N0 of a guide vane in accordance with a static head H and an output command P0. A target speed controller 29 uses as the target speed the value N0 when the value N0 is out of an inhibiting zone and lower or upper limit value when in the inhibiting zone. A phase angle calculator 116 calculates the phase angle of a secondary winding on the basis of effective power, output command P0, target speed and the speed N, and applies it to a setter 17. Phase shifters 23a-23c excite a-, b-and c-phases in accordance with the excitation amount set by the setter 17. Thus, the capacity of a cycloconverter can be reduced.

10. 发明专利

JPS6343598A OPERATION CONTROLLER FOR VARIABLE-SPEED PUMP-STORAGE GENERATING SYSTEM 失效
公开(公告)号：JPS6343598A
公开(公告)日：1988-02-24
申请号：JP18682986
申请日：1986-08-11
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： NOHARA GOO , GOTO MASUO , HARAGUCHI EIJI , NAKAGAWA HIROTO
IPC分类号： H02P9/00 , H02P9/04
摘要： PURPOSE:To stably operate a variable speed pumping-up generator by adding a correction signal to a power control command value when the variation of the rotating speed of an induction machine is a constant value or higher and the rotating speed of the machine is displaced at predetermined value or more from a target value. CONSTITUTION:A power control command P0 is applied through a delay circuit 15 to a phase angle calculator 16, and an optimum guide vane opening Y is provided by an optimum opening function generator 25 according to a head H. A phase angle calculator 16 calculates a phase angle A/by an effective power output P and a power control command P0. A rotating speed N is applied to an immovable band circuit 30 and a differentiator 31, and the output of the differentiator 31 is applied to an immovable circuit 32. The outputs of the circuits 30, 32 are applied to an integrator 33, the output of the integrator is applied by an adder 34 to the output of the circuit 15. Thus, a system frequency is stably held, and an optimum operation control is performed.

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