Efficiency of a Doubly Fed Induction Generator Connected on Electrical Grid

The report presents the Efficiency of a Doubly Fed Induction Generator Connected to an Electrical Grid driven by a wind turbine. A DC prime mover is used instead of a wind turbine because it produces a constant speed. In the Doubly Fed Induction Generator (DFIG), the stator is connected directly to the grid while the rotor is connected to a back-to-back converter and also coupled with the DC prime mover.

This structure requires some care during grid synchronization to avoid undesired overloads. The main goal of synchronization is to minimize the electrical transients and mechanical stress components during synchronization.

Different panels are interlinked for the functionality of the machine, I.e., dimmer panel for increasing and decreasing the resistance, LC filter panel for filtering the PWM to a sinusoidal signal, Multifunction converter 3 phase measurement panel for metering, and they display frequency, power factor, voltage, current, energy, Digital Oscilloscope for displaying the signal waveform,

Efficiency of a Doubly Fed Induction Generator Connected on Electrical Grid

A DC prime mover is coupled to a generator to generate electricity, variable DC voltmeter and DC ammeter for measuring voltage and current respectively, Direct On-Line motor starter panel is used for protection against overload, fault and external fault and supply 3 phase power, Insulated Gate Bipolar Transistor (IGBT) acts as the back to back converter, and the FPGA displays the frequency.

The DFIG also determines the efficiency by using the shaft power, i.e., used to couple with the rotor, the inverter power for the back to the buck converter, and the powers exported to the grid in watt all expressed in percentage.

Efficiency of a Doubly Fed Induction Generator (Star Delta Starter) Connected on Electrical Grid

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