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Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator

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

Haoshu Shao¹, Qiang Dong², Zenglu Song²

¹School of Electrical Engineering, Nanjing Vocational University of Industry Technology, Nanjing, 210023, China. shaohaoshu1208@163.com.

Scientific Reports

|January 4, 2025

Summary

This study introduces a new soft grid integration strategy for Doubly-Fed Induction Generators (DFIG) to improve power system stability. The method reduces integration current, enhancing renewable energy system reliability.

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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.