Abstract
A synergetic sliding mode (SSM) approach is designed to address the drawbacks of the direct field-oriented control (DFOC) of the induction generators (IGs) integrated into variable speed dual-rotor wind power (DRWP) systems with the maximum power point tracking (MPPT) technique. Using SSM controllers in the DFOC strategy, the active power, electromagnetic torque, and reactive power ripples are reduced compared to traditional DFOC using proportional-integral (PI) controllers. This proposed strategy, associated with SSM controllers, produces efficient state estimation. The effectiveness of the designed DFOC strategy has been evaluated on variable speed DRWP systems with the MPPT technique.
Highlights
Induction generators have many advantages including low maintenance, high dynamic response, easy control, better speed versus torque characteristics, high efficiency, minimized weight, and more compact construction
Most of the presented techniques for power control of induction generators are based on pulse-width modulation (PWM) and use proportionalintegral (PI) regulators
We proposed a new technique based on the combination of synergistic control and sliding mode control (SMC), intending to create a more robust method and reducing the chattering phenomenon
Summary
Induction generators have many advantages including low maintenance, high dynamic response, easy control, better speed versus torque characteristics, high efficiency, minimized weight, and more compact construction. One of the main disadvantages of this technique is that its effectiveness depends highly on accurate induction generator parameters such as rotor, stator inductances, and resistances Another disadvantage of the direct FOC strategy is the highly active and reactive power ripples [15]. For effectively reducing the reactive and active power undulations, the sliding mode controllers (SMCs) are used to apply the controlled direct and quadrature rotor voltages from the replaced traditional PI controllers by robust control based on SMC technique [19]. This method has several drawbacks, for example, high financial cost, difficulty vantages is that it operates at lower tip-speed ratios compared to the classical wind turbine to control, and a risk of subsynchronous resonance It contains a large number of mechanical [24].
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