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1. 发明专利

JP2001016862A POWER CONVERTER 失效
公开(公告)号：JP2001016862A
公开(公告)日：2001-01-19
申请号：JP18774599
申请日：1999-07-01
申请人： MITSUBISHI ELECTRIC CORP , TOKYO ELECTRIC POWER CO
发明人： NAKAMURA FUMINORI , TAMAI SHINZO , YAMAMOTO TOUMA , MORI HARUYOSHI , OSHIMA MASAAKI
IPC分类号： H02M7/48 , H02M7/5387
摘要： PROBLEM TO BE SOLVED: To reduce waste loss by suppressing direct change between modes 1, 3 in the vicinity of zero cross of an AC output current command. SOLUTION: An AC voltage control means 15 generates an AC output current command of a self-excited voltage type AC/DC converter 6 from a deviation between an AC voltage command generated in an AC voltage command generating means 12 and an actually measured value of load voltage applied to an AC load 7 detected in a voltage detection means 13. A load voltage applied to the AC load 7 is controlled so as to conform to the AC voltage command, but a low-pass filter means is provided as a direct change suppressing means 22 between the voltage detection means 13 and a subtraction means 14, a large component of high change rate of the frequency included in the load voltage is removed. In this way, a large component of change factor included in the AC output current command of the self-excited voltage type AC/DC converter can be removed, direct change between modes 1, 3 is suppressed, the switching frequency can be set lower, consequently losses can be reduced.

2. 发明专利

JP2002084767A POWER CONVERTER 审中-公开
公开(公告)号：JP2002084767A
公开(公告)日：2002-03-22
申请号：JP2001224843
申请日：2001-07-25
申请人： MITSUBISHI ELECTRIC CORP , TOKYO ELECTRIC POWER CO
发明人： NAKAMURA FUMINORI , TAMAI SHINZO , YAMAMOTO TOUMA , MORI HARUYOSHI , OSHIMA MASAAKI
IPC分类号： H02M7/5387
摘要： PROBLEM TO BE SOLVED: To overcome a problem that a constant deviation of the amplitude is maintained between an AC output current command and an actual AC output current of a self-exciting AC/DC voltage converter 6 in the non-loaded condition, when a current error does not cross the threshold and thereby the linear characteristics cannot be obtained in the output AC voltage drop applied to an AC load 7 and in the load current into the AC load 7. SOLUTION: An adder obtains the final AC output current command by obtaining the sum of an AC output current command and an AC output current command compensated value, and a gate command calculation means generates a gate command for each semiconductor switching of the self-exciting AC/DC voltage converter to result in matching between the AC output current and the final AC output current command.

3. 发明专利

JPH1132435A POWER CONVERTER 失效
公开(公告)号：JPH1132435A
公开(公告)日：1999-02-02
申请号：JP18282997
申请日：1997-07-08
申请人： MITSUBISHI ELECTRIC CORP , TOKYO ELECTRIC POWER CO
发明人： NAKAMURA FUMINORI , TAMAI SHINZO , YAMAMOTO TOUMA , OSHIMA MASAAKI , MIYAZAKI SATOSHI
IPC分类号： H02J3/01 , G05F1/70 , H02J3/18
摘要： PROBLEM TO BE SOLVED: To obtain an AC current waveform close to a desired waveform by supplying a power output section with a power command value varying such that the impedance characteristics of a power converter, viewed from an AC power supply, suppresses a harmonic current flowing into the power converter. SOLUTION: A current IS flowing from an AC power supply 1 into a capacitor 6 is detected by a second current detector 7b at a position closer to the AC power supply 1 than the joint of the capacitor 6 and a reactor 5 and the output current Ia from a voltage type inverter 3 is corrected by operating the harmonic component of the detection current IS according to a transfer function. Since such impedance characteristics as the harmonic current IS is suppressed by the output current Ia from the voltage type inverter 3 are attained, the harmonic current IS flowing into the capacitor 6 from the AC power supply 1 can be suppressed effectively even if the output voltage from the AC power supply 1 contains a harmonic voltage.

4. 发明专利

JPH1090311A APPARATUS FOR DETECTING A.C. AMPLITUDE 失效
公开(公告)号：JPH1090311A
公开(公告)日：1998-04-10
申请号：JP24623696
申请日：1996-09-18
申请人： MITSUBISHI ELECTRIC CORP , TOKYO ELECTRIC POWER CO
发明人： TAMAI SHINZO , NAKAMURA FUMINORI , YAMAMOTO TOUMA , OSHIMA MASAAKI , MIYAZAKI SATOSHI
IPC分类号： G01R19/00 , G01R19/04
摘要： PROBLEM TO BE SOLVED: To simplify a circuit constitution by forming an a.c. amplitude estimation value, controlling a controller to make zero an error between the value and an amplitude value of an a.c. signal to be detected, and obtaining the amplitude value from an output. SOLUTION: A phase advancement circuit 5, receiving a voltage signal from an a.c. voltage detector 4, outputs a shift phase voltage signal having a phase advanced by a predetermined amount. A multiplier 14 and a multiplier 15 operate respectively a first, a second a.c. estimation signals by multiplying a first a.c. reference wave of the same phase as that of a voltage signal output from a trigonometric function calculator 13, a second phase-advanced a.c. reference wave output from the calculator 13 by an output of a controller 11. An output of a subtracter 6 becomes a difference of the voltage signal and the first a.c. estimation signal, and an output of a subtracter 7 becomes a difference of the output of the phase advancement circuit 5 and the second a.c. estimation signal. These outputs are multiplied by the first, second a.c. reference waves, and the results are added thereby obtaining an output at an adder 10. The output of the controller 11 as an integrator is changed so that the output of the adder 10 becomes close to zero, whereby the output is nearly equal to the voltage signal, and an amplitude value of a target voltage is detected.

5. 发明专利

JP2003333753A System linked power converter 有权
标题翻译：系统连接电源转换器
公开(公告)号：JP2003333753A
公开(公告)日：2003-11-21
申请号：JP2002140838
申请日：2002-05-16
申请人： Mitsubishi Electric Corp , 三菱電機株式会社
发明人： NAKAMURA FUMINORI , SANADA KAZUNORI
IPC分类号： H02J3/38 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To surely rapidly cut off a current of a linked switch 3 using a semiconductor switch or a mechanical switch not having self-arc suppressing capability at a power system fault time in a system linkage power converter connected to a system power source and a load 2 via the switch 3 and having a DC power source 5 connected to the load 2 side of the switch 3 via a power converter 4 to linkage operate the power system 1 and the power source 5. SOLUTION: The system linked power converter comprises: a switch current command forming means 19 for controlling to feed back the switch current of the linked switch 3; and a switch current control circuit 18. The output current command of the power converter 5 is calculated so that the command for expediting the cut-off of the switch current at the system voltage fault time and the output current command of the power converter 4 is calculated so as to follow to the command, and the converter 4 is controlled. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：在与系统联动功率转换器连接的电力系统故障时刻，使用半导体开关或不具有自电弧抑制能力的机械开关，可靠地快速切断连接开关3的电流系统电源和经由开关3的负载2，并且具有经由功率转换器4连接到开关3的负载2侧的DC电源5以联动操作电力系统1和电源5.解决方案：系统连接电力转换器包括：开关电流指令形成装置19，用于控制反馈链接的开关3的开关电流; 电源转换器5的输出电流指令被计算，以便在系统电压故障时间和功率转换器4的输出电流指令下加速切断开关电流的指令是按照命令进行计算，并且转换器4被控制。版权所有（C）2004，JPO

6. 发明专利

JP2002084796A GENERATING SYSTEM 失效
公开(公告)号：JP2002084796A
公开(公告)日：2002-03-22
申请号：JP2000266630
申请日：2000-09-04
申请人： MITSUBISHI ELECTRIC CORP
发明人： NAKAMURA FUMINORI , TAMAI SHINZO , NAKAYAMA HITOSHI
IPC分类号： F03B13/14 , F03D7/04 , F03D9/00 , H02P9/00 , H02P9/48
摘要： PROBLEM TO BE SOLVED: To provide a power generating system capable of stably supplying power of a predetermined amount to a power system with to an infinitesimal power change or an abrupt power change of a generator. SOLUTION: The power generating system comprises the generator driven by a natural energy such as a wind power; a wave motion or the like for generating a power to transmit power to the power system; a rotating machine connected to a flywheel to convert the power into an electric power to compensate for power of the generator; and a power change suppressing means for extracting a power change waveform increasing or decreasing in association with a change of an electric power amount generated from the generator, forming a power waveform smoothly changing based on the power change waveform, and calculating the power change waveform and the power waveform to decide the power amount to be compensated by the rotary machine. Thus, the power amount can be easily compensated for a relatively large power change from the abrupt or infinitesimal power change. Hence, the power generating system for stably supplying the power of the predetermined amount to the power system with high reliability can be realized.

7. 发明专利

JP2000050642A POWER CONVERSION DEVICE 失效
公开(公告)号：JP2000050642A
公开(公告)日：2000-02-18
申请号：JP21908998
申请日：1998-08-03
申请人： MITSUBISHI ELECTRIC CORP
发明人： NAKAMURA FUMINORI , OGUSA SHINICHI , KOAN TOYOICHI
IPC分类号： H01F27/42 , H01F19/00 , H02J3/38 , H02M7/12 , H02M7/219 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To provide a power conversion device which precisely calculates the magnetic flux of the iron core of a transformer and can suppress the DC- biased magnetization of the transformer, even when the multiplex transformer having a common magnetic path is used. SOLUTION: An AC-side output voltage command for controlling power converters 3A-3C is outputted from a voltage current control circuit 9. Meanwhile, magnetic flux which includes the effect of mutual stages is calculated by a transformer magnetic flux state calculation part 16, a transformer-biased magnetization quantity calculating sections 10A-10C, and output voltage value DC component correction control parts 11A-11C. A voltage command correction is outputted, and two outputs are added in adders 13A-13C.

8. 发明专利

JPH1052055A POWER CONVERTER 失效
公开(公告)号：JPH1052055A
公开(公告)日：1998-02-20
申请号：JP20233696
申请日：1996-07-31
申请人： MITSUBISHI ELECTRIC CORP
发明人： NAKAMURA FUMINORI , TAMAI SHINZO , YAMAMOTO TOUMA
IPC分类号： H02J9/06 , G05F1/70 , H02J3/01 , H02J7/34 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To shape the waveform of electric power flowing from an AC power source in a sine wave even when the AC power source contains harmonic distortion, by suppressing the harmonic current component which is caused by the harmonic voltage distortion of the AC power source and flows in a capacitor from the power source. SOLUTION: An adding circuit 13a generates the current command value Iref of a current control circuit 8, by adding the output of a current command value generating circuit 7 to a harmonic current command value Ihref outputted from a harmonic current command value generating circuit 12 in a capacitor flowing-in harmonic current suppressing means 20, and the circuit 8 outputs a voltage command value Vref which controls an inverter 2 to make the current Ifb matching the current command value Iref. to flow. Consequently, the inverter 2 outputs the harmonic current component of the electric current, which is caused by the harmonic voltage distortion of an AC power source 1 and flows to the connecting point between a reactor 4 and a capacitor 5, and shapes the waveform of the electric current Is from the AC power source 1 to a sine wave, by offsetting the harmonic current component of the electric current Is from the power source 1 having a polarity which is opposite to that of the outputted harmonic current component.

9. 发明专利

JPH07170749A POWER CONVERTER 失效
公开(公告)号：JPH07170749A
公开(公告)日：1995-07-04
申请号：JP31556893
申请日：1993-12-15
申请人： MITSUBISHI ELECTRIC CORP
发明人： NAKAMURA FUMINORI , TAMAI SHINZO , ARITSUKA TOMOHIKO
IPC分类号： G06F9/44 , G06N7/02 , H02J3/18 , H02M7/48 , H02M7/493
摘要： PURPOSE:To obtain a power converter, in which control delay is removed and a higher harmonic requiring instantaneous response can be compensated sufficiently. CONSTITUTION:A first voltage command DELTAV1* is prepared on the basis of the deviation DELTAI* of a current IR* prepared from a higher harmonic component and currents IC output from a power converter 4 while the current command IR* is converted into a second voltage command DELTAV2* according to the correspondence relation of the preset currents IC output from the power converter 4 and a voltage command M* transmitted to a voltage control means 8. The sum of the first voltage command DELTAV1* and the second voltage command DELTAV2* is transmitted to the voltage control means 8 as the voltage command M*.

10. 发明专利

JP2003244981A CONTROL DEVICE FOR AC MOTOR 审中-公开
公开(公告)号：JP2003244981A
公开(公告)日：2003-08-29
申请号：JP2002037864
申请日：2002-02-15
申请人： MITSUBISHI ELECTRIC CORP
发明人： SATAKE AKIRA , NAKAMURA FUMINORI , HATAKEYAMA YOSHIHIRO
IPC分类号： H02P27/02 , H02P23/07 , H02P23/26 , H02P25/04 , H02P29/00 , H02P5/00
摘要： PROBLEM TO BE SOLVED: To provide a control device for an AC motor capable of accurately controlling an AC voltage effective value applied to the AC motor in which load fluctuations are large and a power factor rapidly changes. SOLUTION: This control device controls an AC voltage applied to the AC motor 4 by driving thyristors located between an AC power supply 3 and the AC motor 4. This device comprises a voltage detector 6 for detecting an actual voltage value applied to the AC motor 4 and outputting a detected voltage value, a voltage controller 18 for comparing a voltage command value with the detected voltage value to decrease a value of a firing angle when the voltage command value is larger than the detected voltage value and increase a value of the firing angle when the voltage command value is smaller than the detected voltage value for outputting a value of the firing angle, and a thyristor firing signal generating circuit 10 for firing the thyristors 1, 2 at timing corresponding to the value of the firing angle in which the value of a voltage phase of the AC power 3 is outputted from the voltage controller 18. COPYRIGHT: (C)2003,JPO

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