Apparatus and method for an adaptive level transition of an NPC-inverter within a transformerless uninterruptible power supply

Systems and methods are provided for controlling an uninterruptible power supply (UPS) to transition between three- or higher-level operation and two-level operation in a neutral-point-clamped (NPC) inverter (22). In an example, a UPS system (10) includes an NPC inverter (22) and a controller (24)....

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Bibliographische Detailangaben
Hauptverfasser:	Strozzi, Lauro, Kolhatkar, Yashomani Y, Piemontesi, Marco, Prasad, Lakshmi, Colombi, Silvio
Format:	Patent
Sprache:	eng ; fre ; ger
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:	Systems and methods are provided for controlling an uninterruptible power supply (UPS) to transition between three- or higher-level operation and two-level operation in a neutral-point-clamped (NPC) inverter (22). In an example, a UPS system (10) includes an NPC inverter (22) and a controller (24). The NPC inverter (22) may supply power to a load (14). The controller (24) may control the inverter (22) to operate in a three-level mode or higher when the load (14) is substantially balanced and to operate in a two-level mode when the load (14) is substantially unbalanced.