| Project/Area Number |
10450109
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電力工学・電気機器工学
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| Research Institution | Meiji University |
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Principal Investigator |
MATSUSE Kouki Meiji University, Faculty of Science and Technology, Professor, 理工学部, 教授 (40061999)
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| Co-Investigator(Kenkyū-buntansha) |
KUBOTA Hisao Meiji University, Faculty of Science and Technology, Associate Professor, 理工学部, 助教授 (10170036)
MIKI Ichiro Meiji University, Faculty of Science and Technology, Professor, 理工学部, 教授 (20130833)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥7,400,000 (Direct Cost: ¥7,400,000)
Fiscal Year 2000: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1999: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1998: ¥3,900,000 (Direct Cost: ¥3,900,000)
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| Keywords | Multilevel Double Converters / Five-level Diode Clamped Inverter / Mutiple Connected Inverter / PWM Control / Current-Source-Inverter / Voltage-Source-Inverter / 多重形インバータ / 電流形インバータ |
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| Research Abstract |
In this research, one of the purpose of our works is to presents a control method for a three-phase five-level diode-clamp pulse width modulation (PWM) converter considering dc-link capacitor voltage balancing problem. The proposed control circuit uses multiband hysteresis comparators (MHC's) to simplify the control of the main circuit. The dc-link capacitor voltage balancing problem is solved by changing the shape of the MHC.The proposed method can 1) overcome voltage imbalance at the dc-link capacitors ; 2) achieve a unity power factor ; 3) generate nearly sinusoidal input currents ; 4) regenerate electric power back to the power system.
The next result of this research is to present a control strategy for a five-level double converter system constructed by connecting the rectifier to a five-level inverter for large ac motor drives. In addition to previous advanteges, the method can achieve adustable-speed drive. This research includes the following contents 1) Analysis of Five-Level Diode Clamped Inverter ; Main circuit Configuration, Circuit Analysis, Device Loss Characteristics, 2) Proposed Control Strategy for Five-Level Double Converter System ; Current Control Strategy, Control Method of the Five-Level Voltages, 3) Simulation Results ; 4) Experimental Results ; Experimental Setup, Experimental Results. Simulation and experimental results verified the validity of the control strategy. However, large voltage ripples were observed in the experimental results. Further study is needed to develop a control method that can reduce voltage ripples at the dc link capacitors as well as the harmonic distortions of the input and output waveforms.
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