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1. (WO2017156359) DFIG-BASED UPS SYSTEMS AND METHODS OF CONTROL

Pub. No.:    WO/2017/156359    International Application No.:    PCT/US2017/021721
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Sat Mar 11 00:59:59 CET 2017
IPC: H02J 9/06
H02J 9/08
H02P 9/00
H02P 9/04
H02P 9/08
H02J 3/40
Applicants: GENERAL ELECTRIC COMPANY
Inventors: KOLHATKAR, Yashomani, Y.
COLOMBI, Silvio
TIWARI, Arvind, Kumar
Title: DFIG-BASED UPS SYSTEMS AND METHODS OF CONTROL
Abstract:
An uninterruptable power supply (UPS) system for providing power to a load coupled to a utility power source is provided. The UPS system includes a doubly-fed induction generator (DFIG), a rechargeable energy storage system, a first inverter, and a controller in communication with the DFIG and the first inverter. The DFIG includes a stator and a rotor coupled to the load. The stator and rotor are magnetically coupled together. The DFIG generates an auxiliary power output. The first inverter is coupled between the rotor and the rechargeable energy storage system. The controller detects a power disturbance associated with the utility power source and controls the first inverter to provide an excitation input to the rotor in response to the power disturbance. The DFIG provides the auxiliary power output to the load based on the excitation input.