DFIG-Based Power Generation System With UPS Function for Variable-Speed Applications

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...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2008-08, Vol.55 (8), p.3047-3054
Main Authors: Iwanski, G., Koczara, W.
Format: Article
Language:English
Subjects:
Amplitudes
Distributed control
Distributed power generation
Electric potential
Frequency synchronization
Induction generators
Mathematical analysis
Power generation
power generation faults
Power systems
Rotor speed
Rotors
Synchronism
Synchronization
Uninterruptible power supply
Uninterruptible power systems
Vectors
Vectors (mathematics)
Voltage
Voltage control
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Description
Summary: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.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2008.918473