Dynamic performance of rotor-side nonlinear control technique for doubly-fed multi-rotor wind energy based on...

Area of Science:

• Electrical Engineering
• Control Systems
• Renewable Energy

Background:

• Multi-rotor wind power systems require precise control of the rotor side converter (RSC).
• Traditional direct power control (DPC) methods face challenges with power and current quality.
• Doubly-fed induction generators (DFIGs) are commonly used in these systems.

Purpose of the Study:

• To propose a novel nonlinear controller, the dual super-twisting sliding mode command (DSTSMC), as an alternative to DPC for RSC regulation.
• To enhance the robustness, performance, and efficiency of multi-rotor wind power systems.
• To address and overcome the power and current quality issues associated with existing control strategies.

Main Methods:

• Development of the DSTSMC controller integrated with pulse width modulation (PWM) for RSC regulation (DPC-DSTSMC-PWM).
• Comparative analysis of the proposed DPC-DSTSMC-PWM strategy against standard and existing control methods.
• Validation of the controller's effectiveness through simulations in Matlab/Simulink.

Main Results:

• Significant reduction in active power ripples (up to 83.33%) and reactive power ripples (up to 68.7%).
• Substantial decrease in total harmonic distortion (THD) of currents (up to 76.22%) compared to conventional methods.
• Demonstrated robustness, high performance, and efficiency of the proposed DSTSMC strategy.

Conclusions:

• The proposed DPC-DSTSMC-PWM strategy offers superior performance and robustness for controlling the RSC in multi-rotor wind power systems.
• The controller effectively mitigates power quality issues, enhancing overall system characteristics.
• The DSTSMC presents a viable and effective alternative for advanced wind power system control.