DC-voltage regulation of a five levels neutral point clamped cascaded converter for wind energy conversion system

Multilevel converters are widely recognized as a suitable solution for directly interfacing different types of energy storage systems and power sources to medium voltage grids, due to their advantages for high-voltage and high-power applications. The modeling and the control of the different components of the wind energy conversion system using back-to-back five level converters are presented. The wind turbine is controlled using the maximum power point tracking algorithm (MPPT) based on the wind speed estimation. The vector control of active and reactive power is used to control the doubly fed induction generator (DFIG) through the rotor. The grid side converter allows the control of the average DC-voltage on closed loop. The dynamic behavior of the global system is simulated in MATLAB Simulink environment. The results are shown to validate the effectiveness of the proposed system.