363-26

Inverter-Based Power Flow Control of a Small-Scale Grid-Connected Doubly-Fed Induction Generator in Wind Energy Conversion Systems
Under Variable Wind Speed Conditions

Milkias Berhanu Tuka(1,2), Anatoli Wellhöfer(3)

1. Alexander von Humboldt Foundation Postdoctoral Research Fellowships Programme, Technical University of Applied Sciences Würzburg-Schweinfurt (THWS), Schweinfurt, Germany
2. Addis Ababa Science and Technology University, Addis Ababa, Ethiopia
3.Technical University of Applied Sciences Würzburg-Schweinfurt (THWS), Schweinfurt, Germany

2026-06-27

Inverters are critical components in wind turbine-based energy conversion systems, serving essential roles in control and grid synchronization under dynamic conditions. This paper presents an inverter-based power flow control using PI controller with an anti-windup mechanism for a small-sized 1 kW Doubly-Fed Induction Generator (DFIG), addressing a gap in the literature where the dynamic behavior of such systems is often insufficiently described. The control strategy is integrated with a Maximum Power Point Tracking (MPPT) algorithm. Key real-time machine parameters were derived from experimental tests. To evaluate controller robustness, the system was subjected to a random variation of wind speeds within a comprehensive grid-connected DFIG-based Wind Energy Conversion System (WECS) model. A key contribution and novelty of this work is its reliance on real machine parameters and modes for an in-depth performance analysis conducted using the latest MATLAB/Simulink 2025b environment. The findings indicate that the machine reaches its rated power at approximately 8.5 m/s wind speed at 0° pitch angle under MPPT control in effectively regulating and tracking active and reactive power flows independently, while the cut-in speed is 4 m/s. These findings indicate the machine's suitability for its operation in small-scale grid-connected or micro-grid systems tailored to specific site conditions.

Key words: Doubly-Fed Induction Generator, MATLAB/Simulink, Power Flow Control, PI Controller, Variable Wind Speed

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