Enhanced Power Quality in DFIG-Based Wind Energy Systems Using Efficient Control and Five-Level MMC Integration
Keywords:
Voltage Fluctuations, Multilevel Converter, Photovoltaic System, Pulse Width Modulation (PWM), Renewable Energy IntegrationAbstract
The integration of Doubly Fed Induction Generators (DFIG) in wind energy systems offers variable speed operation and enhanced energy capture. However, challenges like harmonic distortion, voltage fluctuations, and reactive power management affect power quality. This paper proposes an efficient control strategy with a five- level Multilevel Converter (MMC) to improve power quality in DFIG-based wind systems. The system starts with a three-phase AC source supplying power through a Point of Common Coupling (PCC), incorporating source inductance, a transformer, and an LC filter for voltage stability and harmonic reduction. A five-level MMC
converts high-frequency AC to low-frequency AC, enhancing efficiency. A Pulse-Width Modulation (PWM)nrectifier transforms AC input to DC, regulated by a PI controller to maintain voltage stability. PWM generators nprovide control signals for converters, while reference current generation using D-Q theory and a hyster esisn current controller ensure precise current regulation. This setup improves the reliability of renewable energy nintegration, ensuring stable and sustainable power generation. The proposed system is implemented using MATLAB 2021a simulations to validate its effectiveness in enhancing power quality in DFIG-based wind energy
systems.
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