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1. 发明专利

JP2001268798A ELECTRIC POWER STORING SYSTEM 失效
公开(公告)号：JP2001268798A
公开(公告)日：2001-09-28
申请号：JP2000079300
申请日：2000-03-16
申请人： HITACHI LTD , TOHOKU ELECTRIC POWER CO
发明人： KIYOFUJI YASUHIRO , AIHARA TAKASHI , MADORI IWAO , TOYODA MASASHI , SUGIURA YASUYUKI , ICHINOSE MASAYA , FUTAMI MOTOO , UEDA SHIGETA , URANO KIMIO , SATO TAKU , WAKU HIDEKI , YAGI MAKOTO
IPC分类号： H02H3/16 , H02H3/20 , H02J3/12 , H02J3/32 , H02J15/00 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To improve operation continuity and safety (sure protective stop) when an accident is generated in a linked AC system of electric power storing system. SOLUTION: The electric power storing system equipped with an AC-DC converting apparatus 2 and a secondary battery 3 is connected with a connection point 8 of a three-phase AC system 1. Each of the line voltages of the connection point 8 is inputted in a positive phase voltage detecting part 4, which performs discrete Fourier transformation and detects a positive phase voltage amplitude Vs and a positive phase voltage phase θs on the basis of the transformed real axis component and imaginary axis component. In order to adjust AC power outputted from the AC-DC converting apparatus 2, a power conversion control part 6 performs vector control of an output voltage Vc of the converting apparatus 2 on the basis of the positive phase component phase θs of a connection point voltage at the connection point 8, and maintains stable control when a system accident is generated. A protective stop judging part 5 outputs a stop signal and stops the electric power storing system, when generation of an accident necessary for protective stop like 3-line grand fault is judged on the basis of the positive phase component amplitude Vs of the connection point voltage.

2. 发明专利

JP2003134892A WIND-POWER GENERATOR AND METHOD OF WIND POWER GENERATION 审中-公开
公开(公告)号：JP2003134892A
公开(公告)日：2003-05-09
申请号：JP2001327458
申请日：2001-10-25
申请人： HITACHI LTD
发明人： KIKUCHI TERU , FUTAMI MOTOO , SUGIURA YASUYUKI , SUGAWARA NAOSHI , MIYAZAKI KOICHI
IPC分类号： F03D9/00 , F03D9/02 , H02P9/00
摘要： PROBLEM TO BE SOLVED: To prevent the risk of a conventional wind-power generator which supplies a power system with the power which marring quality due to short cycles of fluctuations that it cannot respond by the pitch control of a windmill or the output control of a power rectifier. SOLUTION: The power system can be supplied with a proper quality of power where power ripples are suppressed, by providing a generator with a controller which outputs commands of charging a DC capacitor 4 with DC power, when the output of a synchronous generator 2 connected to the shaft of a windmill 1 increases, and lowering the terminal voltage across the DC capacitor 4 and discharging DC power to the inverter 5 from the DC capacitor 4 to an inverter 5, when the output of the synchronous motor 2 decreases.

3. 发明专利

JPH09331678A POWER CONVERTER 失效
公开(公告)号：JPH09331678A
公开(公告)日：1997-12-22
申请号：JP17066796
申请日：1996-06-10
申请人： HITACHI LTD
发明人： SUGIURA YASUYUKI , FUTAMI MOTOO , SATO HIROYASU , UEDA SHIGETA
IPC分类号： H02J3/36 , G01R25/00 , H02M7/12 , H02M7/155
摘要： PROBLEM TO BE SOLVED: To continue operation of a power converter by detecting the phase of an accurate and positive system voltage and controlling it safely even if abnormality occurs in an AC system. SOLUTION: The phase (θFi) of an angular speed integrating circuit 134 obtained by integrating a frequency standard signal 132 is used for operating trigonometric function of a Fourier transform operating circuit 127. A positive phase voltage phase (θdi) which is obtained by a positive phase absolute value phase variation operating circuit 128 from Fourier transform is made a phase variation between the phase (θs) of a system voltage and the phase (θFi) of the angular velocity integrating circuit, and a deviation to a zero value 129 is proportional integral-controlled. The output of the proportional integral control 131 is added to the frequency standard signal, and negative feedback is given to the phase of the trigonometric function of the Fourier transform. When some abnormality is found in a three-phase AC power source, the integral term of a phase difference proportional integral circuit is kept constantly at the value before the abnormality, and the integral term is added to the frequency standard signal to detect the phase of the system voltage.

4. 发明专利

JPH08266058A POWER CONVERTER 失效
公开(公告)号：JPH08266058A
公开(公告)日：1996-10-11
申请号：JP8877095
申请日：1995-03-22
申请人： HITACHI LTD
发明人： SUGIURA YASUYUKI , UEDA SHIGETA , IMAIE KAZUHIRO , KOSEKI SHOICHIRO
IPC分类号： H02J1/00 , H02J3/18 , H02M7/12 , H02M7/155
摘要： PURPOSE: To provide a power converter which performs stable power conversion control even if unbalanced voltage occurs by the abnormality of an AC power system, and stably controls 5 DC power transmitter, a reactive power controller, etc., where the power converter is connected to the power system, thereby enables nonstop operation. CONSTITUTION: This power converter is equipped with a means 119, which gets a voltage and β voltage of two phases by converting the voltage for three phases of a three-phase AC power into that for two phases, a means 120, which finds out sine amplitude of fundamental wave on a coordinate, cosine amplitude of fundamental wave on α coordinate, sine amplitude of fundamental wave on β coordinate, and cosine amplitude of fundamental wave on 3 coordinate by storing the a voltage and βvoltage of two phases separately for each sample over one cycle of AC power, and summing up the products of this value and sine wave and cosine wave tables in order, and finds out the fundamental wave amplitude for positive phases on αcoordinate and the fundamental wave amplitude for positive phase on β coordinate by adding or subtracting these, and a means 121 which detects the phase for positive phase by dividing these amplitude of fundamental waves for positive phase on αcoordinate and the amplitude of fundamental waves for positive phase on β coordinate and operating reverse tangent from the results of division.

5. 发明专利

JPH06339277A MULTIPLEX POWER CONVERSION DEVICE 失效
公开(公告)号：JPH06339277A
公开(公告)日：1994-12-06
申请号：JP12674393
申请日：1993-05-28
申请人： HITACHI LTD
发明人： NOHARA MIKIYA , UEDA SHIGETA , SUGIURA YASUYUKI , MOTOBE MITSUSACHI
IPC分类号： H02M7/497 , H02P27/06 , H02M7/48 , H02P7/63
摘要： PURPOSE:To make a high speed response of a multiplex power converter control possible providing second controllers at every unit power converter and processing in parallel the arithmetic operations of the AC output voltage of the converters respectively having phase difference commanding values. CONSTITUTION:Second controller 3 input AC-DC voltage commanding values Vp* and Vq* of a rotational coordinate system, voltage phase commanding value theta*, and phase difference commanding values delta1*-deltan* with respect to a fundamental-wave voltage on the AC side from a first controller 2 and outputs inverter driving signals PG1-PGNn to a power converter 1. Then the controllers 3 respectively process in parallel the arithmetic operations of the AC output voltage of the converter 1 having the phase difference commanding values delta1*-deltan*. Therefore, a high speed response of the power converter control can be achieved, because the controlled arithmetic operations can be processed at a high speed and the sampling period can be shortened.

6. 发明专利

JPH0446582A CONTROLLER FOR AC SERVOMOTOR 失效
公开(公告)号：JPH0446582A
公开(公告)日：1992-02-17
申请号：JP15247090
申请日：1990-06-11
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： SUGIURA YASUYUKI , SUZUKI KATSUNORI , TOMITA HIROYUKI , NAKAGAWA KAZUYUKI
IPC分类号： H02P21/00 , H02P21/06 , H02P21/22 , H02P23/07 , H02P23/16 , H02P23/18 , H02P23/22 , H02P27/04 , H02P27/08 , H02P27/12
摘要： PURPOSE:To share IM and SM only by simple changeover by obtaining the angle of rotation at the position of magnetic flux corresponding to sliding velocity and selectively adding the angle of the sliding rotation to the position of magnetic flux detected. CONSTITUTION:An inverter 2 is switching-driven according to PWM gate pulses given from a control board 101, and converts input DC power 3 into the ACs of fixed frequency and fixed voltage and outputs them. The control of an AC servomotor 1 variably controls the speed of the motor 1 at a desired value fundamentally, the actual speed of the motor 1 is detected for the control, and motor currents are controlled so as to bring the deviation of the actual speed of the motor 1 and a speed command value to zero. When the motor currents are controlled, motor currents are divided into a (d) axis component and a (q) axis component, and a voltage vector is selected in response to these components and the inverter 2 is driven. Accordingly, the position of the magnetic flux of the motor 1 is detected, and the current components of (d) and (q) axis are controlled in conformity with the detection.

7. 发明专利

JPH0337396B2 失效
公开(公告)号：JPH0337396B2
公开(公告)日：1991-06-05
申请号：JP14194083
申请日：1983-08-04
申请人： HITACHI LTD
发明人： SUGIURA YASUYUKI , MORINAGA SHIGEKI , ENDO TSUNEHIRO , TAJIMA FUMIO , MYASHITA KUNIO , KATO KAZUTOSHI , MURAMATSU MASAHARU
IPC分类号： H02P29/00 , G01P3/489

8. 发明专利

JPH02131389A SINUSOIDAL GENERATOR 失效
公开(公告)号：JPH02131389A
公开(公告)日：1990-05-21
申请号：JP27724488
申请日：1988-11-04
申请人： HITACHI LTD
发明人： ONOE TOSHIKA , SUGIURA YASUYUKI , WATABE MITSURU , MIYASHITA KUNIO
IPC分类号： H02P6/16 , H02P6/06 , H02P6/08
摘要： PURPOSE:To obtain continual sinusoidal waves and to reduce a sinusoidal wave ROM of U- and V-phases by adding U-phase, V-phase and W-phase signals, a U/V switching signal and a normal rotation/reverse rotation signal to the higher-order of an updown counter, and by extending the addresses of the sinusoidal wave ROM. CONSTITUTION:The address of a sinusoidal wave ROM 21 to output sinusoidal waves is extended to 13-bits by adding 8-bits of an updown counter 9 and more significantly a normal rotation/reverse rotation signal selecting 0.1 as a result of operation of a microcomputer, a U/V switching signal alternately fetching U-phase and V-phase data and U-phase, V-phase and W-phase signals deviated by 120 deg.C in phase. Continual sinusoidal waves can thereby be obtained and a U-phase and V-phase sinusoidal wave ROM reduced.

9. 发明专利

JPH029983B2 失效
公开(公告)号：JPH029983B2
公开(公告)日：1990-03-06
申请号：JP10248580
申请日：1980-07-28
申请人： HITACHI LTD
发明人： KAWAMATA SHOICHI , SUGIURA YASUYUKI , MYASHITA KUNIO , SAITO SHIGEKI , KOIZUMI OSAMU
IPC分类号： F04D27/00 , B60L1/00 , B60L3/00 , B61C3/00 , B61C17/00 , H02P7/28 , H02P7/29

10. 发明专利

JPH01314016A INPUT SIGNAL CONVERTING METHOD FOR DIGITAL SERVO SYSTEM 失效
公开(公告)号：JPH01314016A
公开(公告)日：1989-12-19
申请号：JP14372488
申请日：1988-06-13
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： NAGASE HIROSHI , MUTO NOBUYOSHI , MIYASHITA KUNIO , SUGIURA YASUYUKI , KOBAYASHI SUMIO , NAKAGAWA KAZUYUKI
IPC分类号： H03M1/60
摘要： PURPOSE:To attain inexpensive input signal conversion with high accuracy by converting once an analog command signal into a pulse signal having a frequency proportional to the command signal and detecting the said frequency. CONSTITUTION:A voltage/frequency converter (V/F converter) 1 receives an analog speed command signal and outputs a pulse signal having a frequency proportional to the level. The output of the V/F converter 1 is given to a counter 2, which counts number of pulses from the V/F converter 1 and just after a microcomputer circuit 101 reads the value for each prescribed read time, the counter 2 is reset by a reset signal from the microcomputer circuit 101. In this case, the count of the counter 2 is a value proportional to the pulse frequency, that is, the input analog signal and a digital signal proportional to the analog command signal is extracted. Then the digital command signal with high accuracy is obtained from the analog command signal with inexpensive constitution.

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