DFIG-Based Power Generation System With UPS Function for Variable-Speed Applications
Iwanski, G.
Koczara, W.
Warsaw Univ. of Technol., Warsaw;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Aug. 2008
Volume: 55,
Issue: 8
On page(s): 3047-3054
ISSN: 0278-0046
Digital Object Identifier: 10.1109/TIE.2008.918473
First Published: 2008-02-22
Current Version Published: 2008-07-29
Abstract The power generation system with a doubly fed induction generator (DFIG), which can be used as an autonomous power system after the loss of mains in a distributed generation network, is described. After the mains outage, a fixed frequency and an amplitude of the output voltage are obtained, despite the variable rotor speed. For this reason, it can be successfully applied in the variable-speed wind turbines, adjustable speed water plants, or diesel engines. Moreover, the stand-alone operation of DFIG is useful in a flywheel-based high-energy rotary uninterruptible power supply system. An output voltage is controlled directly by the synchronization of an actual voltage vector with the reference vector represented in a synchronously rotating polar frame. The rotor current angular speed is obtained as a result of vectorial phase-locked loop operation. Any sensors or estimators of the rotor speed or position are unnecessary. Both amplitude and angle control loops are linear. The use of stand-alone operation in grid-connected systems requires mains outage detection. Also, the grid voltage recovery requires a method of synchronization and soft connection of a generator to the grid. The proposed methods of output voltage control, synchronization, and detection of mains loss were tested in a laboratory system.
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