Abstract
Multi-level voltage source converter is integrated in various fields in renewable energy power generation technologies such as wind and solar sources for applications that need higher voltage and higher power. In wind power generation market, doubly fed induction generator (DFIG) based on wind power generation is now the leading technology as they are economically feasible, they do offer a variable speed and efficient substitute to the fossil fuel. This paper proposes a DFIG based on a back to back diode clamped multilevel converter systems (DCMLI) fired comparatively by sinusoidal pulse width modulation (SPWM) and third harmonic injection pulse width modulation (THIPWM) techniques. By using these technologies, the DFIG performance is compared for different wind speeds under normal operation condition. The proposed approach shows that the DCMLI systems generate a near sinusoidal voltage with lower values in total harmonic distortion (THD) thus, upgrading the power quality that is produced by DFIG. Lastly, the variation of frequency of induced rotor voltage and the active power flow due to the wind speed changes when the rotor speed changes from super synchronous to sub synchronous speeds is investigated.
Highlights
The last three decades, the resources of renewable energy are strongly penetrated into the conventional grid of power system
In doubly fed induction generator (DFIG), the stator is directly connected to the grid and a back to back multi-level inverter (MLI) fired by sinusoidal pulse width modulation (SPWM) and third harmonic injection pulse width modulation (THIPWM) techniques in the circuit of the rotor which initiate the link between rotor and grid sides
The performance of a diode clamped multilevel inverter based vector controlled DFIG is investigated under different operating conditions
Summary
The last three decades, the resources of renewable energy are strongly penetrated into the conventional grid of power system. The variable-speed WECS based on DFIG amount is almost fifty percent of the total number of all globally installed wind turbines. This is because they have obvious features as follow, lower cost, the back to back converters power rating is lower, speed span is wide, independent power control, and lower power 1osses [1]. The DFIG is able to be operated in two different modes: sub-synchronous mode or super synchronous mode due to the converters have bi-directionally power flow ability. The variation of frequency of induced rotor voltage and the active power flow due to the variation in wind speed according to the rotor speed changes from super synchronous to sub-synchronous speeds are considered
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