This paper presents WECS (wind energy conversion
system) installed with BTB (back-to-back) medium voltage
diode clamped five-level converter and SCIG (Squirrel-Cage-
Induction-Generator) for a large capacity wind turbine (5MW).
The DTC (direct torque control) has been used for the machine
side diode clamped five-level converter. The use of DTC with the
MLC (multilevel converter) gives a better performance of SCIG
(flux, torque, current and speed) to improve the energy
efficiency of a variable speed WECS. Utility-grid side diode
clamped five-level converter uses the DPC (direct power control)
technique. This technique is used to improve the performance of
the delivered power flowing from the dc-link to the electric
utility-grid (decrease ripples of the DC-link voltage, decrease
THD (total-harmonic-distortion) and improve the power factor
of the injected power to the utility-grid). The proposed system
simulation is done using Matlab/SimulinkSimscape Power
Systems to compare this system and the classical two-level
converter. |
