Method for operating parallel DC-linked AC converters for feeding an asynchronous motor and circuitry for carrying out the method

A first DC-linked AC converter with a machine converter (6) with controllable turn-on thyristors is connected in parallel with a second DC-linked AC converter with a machine converter (4) equipped with so-called gate-turn-off (GTO) thyristors which can be turned off. The second DC-linked AC converte...

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Bibliographische Detailangaben
Hauptverfasser:	HOHMUTH, GUENTER
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:	A first DC-linked AC converter with a machine converter (6) with controllable turn-on thyristors is connected in parallel with a second DC-linked AC converter with a machine converter (4) equipped with so-called gate-turn-off (GTO) thyristors which can be turned off. The second DC-linked AC converter with a machine converter equipped with controllable turn-on and turn-off thyristors is particularly adapted to feed a drive for pumps and fans where an exceedingly small torque and a small output power is required at low rotation speeds. The second DC-linked AC converter equipped with GTO thyristors is controlled so as to supply predominantly the reactive power for the asynchronous machine (5) and the commutation reactive power for the normal thyristor converter (6) minus the reactive power of the capacitors (CR).