Apparatus and method for active filters

An active filter (4) for compensation of variations in an apparatus (3) current consumption from a power grid (1) as a cause of variations in the apparatus electrical load, through active frequency filtering and dynamic compensation of reactive energy/current. For each of the power grid's phase...

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Bibliographische Detailangaben
Hauptverfasser:	STROM PETER, LILJENGREN DAN
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 CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION SYSTEMS FOR STORING ELECTRIC ENERGY
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Beschreibung
Zusammenfassung:	An active filter (4) for compensation of variations in an apparatus (3) current consumption from a power grid (1) as a cause of variations in the apparatus electrical load, through active frequency filtering and dynamic compensation of reactive energy/current. For each of the power grid's phases (a, b, c) the active filter comprises a transistor bridge (Ta, Tb, Tc) connected between each mentioned phase and a DC-link (7). The active filter comprises a filter circuit arranged to reduce disturbances on the power grid caused by the active filter of LCL-type. Preferably the active filter further comprises a control system (9) which comprises means in order to with a given working frequency (f) calculate point in time to which with said transistor bridges reverse the current direction through said DC-link, and said filter circuit is preferably adjusted to said working frequency.