SUPPRESSING METHOD FOR HIGHER HARMONIC CURRENT OF CAPACITOR FOR POWER FACTOR IMPROVEMENT

PURPOSE:To provide the higher harmonic current suppressing means for the capacitor for power factor improvement which can reduce a higher harmonic current flowing in the capacitor for power factor improvement, an existent equipment, even if the voltage VS of a system power source contains higher har...

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Bibliographische Detailangaben
Hauptverfasser:	KAMIMURA YOSHIAKI, SHIODA TAKESHI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONTROL OR REGULATION THEREOF CONTROLLING CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION PHYSICS REGULATING SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES SYSTEMS FOR STORING ELECTRIC ENERGY
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Beschreibung
Zusammenfassung:	PURPOSE:To provide the higher harmonic current suppressing means for the capacitor for power factor improvement which can reduce a higher harmonic current flowing in the capacitor for power factor improvement, an existent equipment, even if the voltage VS of a system power source contains higher harmonics. CONSTITUTION:An active filter 7 is connected in parallel to the capacitor 4 for power factor improvement provided in a power distribution system and a control unit 9 for the active filter 7 is equipped with a current detector 121 which detects the resultant current ISC of the active filter 7 and capacitor 4 for power factor improvement; and the current detector 121 has a resistor 122 for current detection and means 123 and 124 which perform second order differentation of the outputs of the resistor to suppress the higher harmonic current, thus obtaining the higher harmonic current suppressing method for the capacitor 4 for power factor improvement.