Soft grid integration control strategy for self synchronized voltage source DFIG wind turbine generator

Area of Science:

• Electrical Engineering
• Renewable Energy Systems
• Power Systems

Background:

• Integrating renewable energy sources like wind power requires advanced control strategies beyond simple replacement of fossil fuels.
• Maintaining power system stability, including voltage establishment and power balance, is crucial for high wind energy penetration.
• Doubly-Fed Induction Generators (DFIG) with self-synchronized voltage source control offer potential for virtual inertia and improved frequency stability.

Purpose of the Study:

• To address the gap in research concerning soft grid integration of DFIG wind turbine generators.
• To propose a novel control strategy for the mechanical and electrical start-up processes of DFIGs during grid integration.
• To significantly reduce the integration current of DFIGs during grid connection.

Main Methods:

• Development of a novel soft grid integration control strategy for DFIGs.
• Coordination of pre-synchronization control for both the DFIG rotor-side converter and grid-side converter.
• Implementation and verification of the strategy on a Real-time Digital Simulator (RTDS).

Main Results:

• The proposed strategy effectively manages both mechanical and electrical start-up phases.
• Coordination of converters significantly reduces the integration current of the DFIG.
• The control strategy demonstrates effectiveness in soft grid integration scenarios.

Conclusions:

• The novel soft grid integration strategy enhances the stability and reliability of DFIG-based wind power systems.
• This approach is vital for the successful transformation towards power systems dominated by renewable energy.
• The validated strategy contributes to smoother and more robust grid integration of wind energy.