HIGHER HARMONICS MEASURING METHOD FOR POWER SYSTEM

Japanese Patent JP2940598

B2

PROBLEM TO BE SOLVED: To accurately obtain admittance of equivalent circuit on higher harmonic of at least one of upper or lower power system from actual measurement results without injecting higher harmonic.
SOLUTION: Higher harmonic with frequency of integer times of fundamental wave of system current is set a measuring harmonic. At the higher harmonic injection point (a) of power system 1, currents with frequency of non-integer times of fundamental wave of the upper and lower sides of the measuring harmonic are injected, respectively. The voltage of the higher harmonic injection point (a) based on the respective injection of both currents and the current at least one side at upper and lower level of the higher harmonic injection point (a) of power system 1 are measured. The upper and the lower equivalent circuits 6 and 2 are made parallel circuit of admittances 8 and 7 and current sources 10 and 9. At least one of the upper and lower levels is made an attention side and from the measurement results, admittances 8 and 7 of the injection currents in the attention side are calculated. By interpolating processing based on the admittances 8 and 7 of the both injection currents, the admittances 8 and 1 of the measuring harmonic in the attention side is obtained and determined.

FUJITA HIDENORI
NAKAMURA TOSHIHIRO
KODA ISAO
NISHIMURA SOJI
NATSUDA YASUKAZU

JP31019296A

August 25, 1999

November 05, 1996

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CHUBU DENRYOKU KK
NITSUSHIN DENKI KK

G01R27/02; G01R23/20; G01R29/00; H02J3/01; (IPC1-7): G01R23/20; G01R27/02; G01R29/00; H02J3/01

Ryutaro Fujita

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