| Project/Area Number |
08455135
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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 | Okayama University |
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Principal Investigator |
AKAGI Hirofumi Okayama University, Electrical Engineering, Professor, 工学部, 教授 (80126466)
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| Co-Investigator(Kenkyū-buntansha) |
FUJITA Hideaki Okayama University, Electrical Engineering, Research Associate, 工学部, 助手 (40238580)
OGASAWARA Satoshi Okayama University, Electrical Engineering, Associate Professor, 工学部, 助教授 (40160733)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥8,300,000 (Direct Cost: ¥8,300,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1996: ¥6,000,000 (Direct Cost: ¥6,000,000)
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| Keywords | Voltage harmonics / Active filters / Passive filters / PWM inverters / Harmonic porpagation / Harmonic damping / 配電系統 / 高調波拡大現象 / インバータ / パワーエレクトロニクス / 高調波 / 電力用アクティブフィルタ |
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| Research Abstract |
The serious status of harmonic pollution in Japan has been reported : The maximum value of 5th harmonic voltage in the downtown area of a 6.6-kV power distribution system exceeds 7% under light-load conditions at night. These observations, which are based on the actual measurements, suggest that the increase of 5th harmonic voltage on the 6.6-kV bus at night is due to "harmonic propagation" resulting from harmoni resonance between line inductors and shunt capacitors installed on the distribution system for power factor correction.
Research has been done on a shunt active filter based on voltage detection, which is controlled in such a way as to present infinite impedance to the external circuit for the fundamental frequency, and as to exhibit a low resistance for harmonic frequencies. A power distribution feeder rated at 200 V and 20 kW has been designed and constructed to verify the practical viability and justification of the active filter rated at 0.67 kVA.Experimental results obtained from the laboratory system, along with theoretical results, are summarized as follows.
・Installation of the active filter on the end bus of a power distribution line is more effective in harmonic damping than installation on the beginning bus or in the vicinity of a primary ditribution transformer.
・Installation on the end bus makes the required current ration of the active filter smaller than installation at the beginning bus.
・Harmonic mitigation ofvoltage and current is a welcome "byproduct, " as a result of harmonic damping throughout the power distribution line.
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