METHOD OF SUPPRESSING HIGHER HARMONIC VOLTAGE OF DISTRIBUTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To adjust the property of the seventh harmonics and control the higher harmonic voltages, by installing a small-capacitance capacitor fitted with a specified % series reactor permanently in this system when installing a high-voltage capacity fitted with a series reactor for control of the second harmonic voltage. SOLUTION: In a power distribution system where a capacitor fitted with a series reactor for control of the fifth harmonic voltage, a small-capacitance capacitor (42) fitted with an % series capacitor is installed permanently in parallel in this system. In other words, to suppress the seventh harmonic voltage, a small-capacitance capacitor (42) fitted with an % series capacitor is installed permanently in parallel for the purpose of shifting the parallel resonance point of the seventh harmonic wave viewed from a higher harmonic current source. That is, a 200kVar capacitor C' fitted with an 42% series reactor is added. Hereby, it does not relate to the system operation state, and the occurrence of abnormal voltage by the seventh harmonic waves is suppressed completely.