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1. 发明专利

JPH07218557A SIGNAL DETECTION CIRCUIT OF DIGITAL CONTROL DEVICE 失效
公开(公告)号：JPH07218557A
公开(公告)日：1995-08-18
申请号：JP30618194
申请日：1994-12-09
申请人： HITACHI LTD , HITACHI PROCESS COMPUTER ENG , HITACHI ELECTRIC SYSTEMS
发明人： KOIZUMI MINORU , MANJO MINORU , WAKUKAWA TAKESHI
IPC分类号： G01R15/18 , G01R19/00 , H02H3/02 , H02P9/14
摘要： PURPOSE:To make correction of the frequency and phase lag of analog filters which are furnished to absorb surge and remove DC component from signals detected from the AC momentary value signal. CONSTITUTION:AC momentary value signals given by a transformer (PT) 10 for instrument and a current transformer (CT) 9 for instrument are processed by analog filters 21, 22, and then the frequency for performing correction by a frequency (f) detecting means 103 is detected, and upon detecting of the effective values 102, 112, a frequency correction of the detected signal gain is performed by frequency (f) correcting means 104, 114, and the corrected signal is supplied to an automatic digital voltage adjuster 120. This enables removal of DC component and absorption of surges, correcting in compliance with change in the input signal, and detecting of stable signals.

2. 发明专利

JPH09215198A AUTOMATIC VOLTAGE REGULATOR 失效
公开(公告)号：JPH09215198A
公开(公告)日：1997-08-15
申请号：JP2090796
申请日：1996-02-07
申请人： HITACHI LTD , HITACHI ELECTRIC SYSTEMS
发明人： WAKUKAWA TAKESHI , SHIMOYAMADA TAKASHI
IPC分类号： H02J3/18 , G05F1/00 , G05F1/67 , G05F1/70 , H02J3/38
摘要： PROBLEM TO BE SOLVED: To eliminate a reactive power controller for exclusive use by providing a switching function for determining reactive power command values for individual synchronous machines including one master machine, delivering a reactive power command value to other voltage regulator and making an automatic switching to other sound voltage regulator upon failure of the master. SOLUTION: A reactive power command value is transmitted from a master automatic voltage regulator through a transmission processing section 5 and a transmission network 6 to the automatic voltage regulator for each axis and stored in the memory section thereof. The automatic voltage regulator for each axis performs reactive power control, based on the received command. When all axes are normal, an automatic voltage regulator 7 having highest pruority serves as a master and the master is switched sequentially to an automatic voltage regulator 7 having lower priority when the master becomes abnormal. This arrangement eliminates a reactive power controller for exclusive use and enhances the economy.

3. 发明专利

JPH0270300A EXCITATION CONTROLLER FOR SYNCHRONIZER 失效
公开(公告)号：JPH0270300A
公开(公告)日：1990-03-09
申请号：JP21835288
申请日：1988-09-02
申请人： HITACHI LTD , HITACHI ELECTRIC SYSTEMS
发明人： MANJO MINORU , WAKUKAWA TAKESHI
IPC分类号： H02P9/14
摘要： PURPOSE:To assure the high functions at low cost by a method wherein the excitation amount of an excitor is set up corresponding to the difference between an output voltage and the set up voltage so that the circuit to control a specified terminal voltage and the low and medium speed control circuit may be respectively composed of an analog circuit and a digital circuit. CONSTITUTION:The output from a generator G is transferred 7 to feed an excitor with excitation current through the intermediary of a thyristor 8, a breaker 9. An automatic voltage regulator 1 digital-processes 2 the data (sub loop) from PT14, CT6 and a field current detector 14 to output medium low speed voltage signals (a), auxiliary functional signals (b) for inputting to an analog circuit 3. The analog circuit 3 (main loop) inputs system voltage from a PT25 to analog-process the difference from a voltage setter 10 for outputting high speed signals and reducing from the auxiliary functional signals to amplify 11 for controlling the opening and closing of another thyristor 18 by the output from an automatic pulse shifter 13 through the intermediary of a transfer switch 12. Through these procedures, only the parts required of high speed processing are analog-processed while the other parts are digital-processed to assure the control with high functions and reliability at low cost.

4. 发明专利

JPH05227800A AUTOMATIC VOLTAGE REGULATOR 失效
公开(公告)号：JPH05227800A
公开(公告)日：1993-09-03
申请号：JP2389792
申请日：1992-02-10
申请人： HITACHI LTD , HITACHI ELECTRIC SYSTEMS
发明人： WAKUKAWA TAKESHI , MANJO MINORU
IPC分类号： H02P9/30
摘要： PURPOSE:To provide an automatic voltage regulator for generator or the like in which man-machine interface is visualized and the operation is made simple and reliable. CONSTITUTION:CPU 32 in a digital automatic voltage regulator controls a display 22 to display an allowable curve or the like and the coordinates of at least one point designated on the display through a keyboard 20 or the like are read out. Function of limit curve is then created according to the formula of an arc, a straight line, a hyperbolic curve, a spline, or the like passing through the designated point and thus created function of limit curve is then displayed on the display 22. The function of limit curve is then outputted to a pulse generator 34 and employed in the test or actual automatic regulation of voltage. According to the constitution, voltage setting/modifying operation and field current setting/modifying operation are made simple and reliable and accuracy thereof is enhanced, resulting in reduction of manpower and materials in field test operation with high efficiency.

5. 发明专利

JPH05224701A AUTOMATIC CONTROLLER 失效
公开(公告)号：JPH05224701A
公开(公告)日：1993-09-03
申请号：JP2389892
申请日：1992-02-10
申请人： HITACHI LTD , HITACHI ELECTRIC SYSTEMS
发明人： WAKUKAWA TAKESHI , MANJO MINORU
IPC分类号： G05B11/36
摘要： PURPOSE:To always detect the signals with high precision by correcting automatically the proper errors like the gain, phase, hysteresis, etc., of an input signal detecting circuit. CONSTITUTION:A reference signal which is free from the phase and waveform distortions is applied to a signal detecting circuit 3 and then inputted to an input signal correcting circuit 4 in an automatic correcting circuit for input signals. In this correcting circuit, a constant calculating circuit 6 automatically sets the parameter (constant) of the circuit 4 so that the coincidence is secured between the output of the circuit 4 end the output of an input signal reference value circuit. Therefore the signal of the circuit 4 is coincident with the output of the input signal reference value circuit. Then the proper errors of the circuit 3 can be automatically corrected.

6. 发明专利

JPS58207827A RECEIVED POWER FACTOR CONTROLLER 失效
公开(公告)号：JPS58207827A
公开(公告)日：1983-12-03
申请号：JP8991682
申请日：1982-05-28
申请人： HITACHI LTD , HITACHI OMIKA DENKI
发明人： WAKUKAWA TAKESHI , MOMOCHI YASUSHI
IPC分类号： H02J3/50

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