Title:
同期フェーザ測定装置
Document Type and Number:
Japanese Patent JP4038484
Kind Code:
B2
Abstract:
A synchronous vector measuring device can measure an absolute phase angle of a synchronous vector excellent in continuous numerical stability at high speed and with high accuracy in a noisy electric power system. A voltage measuring part measures the voltage of the electric power system at a period equal to 1/4N (N being a positive integer) of one period of a reference wave. A voltage root-mean-square value calculation part calculates, at each voltage measuring timing, a voltage root-mean-square value at a specific timing from the voltages measured at past 4N timings including the specific timing. An absolute phase angle calculation part makes, at each voltage measuring timing, an inverse cosine of a value obtained by dividing the voltage measured at the specific timing by the product of the voltage root-mean-square value and the square root of 2, as the absolute phase angle of the synchronous vector at the specific timing.
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Inventors:
Kenpei Seki
Application Number:
JP2004005917A
Publication Date:
January 23, 2008
Filing Date:
January 13, 2004
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
G01R25/00; H02H3/48; G01R21/133; G01R23/02; G01R29/00; G01R31/08; H02H3/26
Domestic Patent References:
| JP9093792A | ||||
| JP11225426A | ||||
| JP2002199579A | ||||
| JP2003270277A | ||||
| JP2002196025A |
Attorney, Agent or Firm:
Michiharu Soga
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order