An improved VSG control strategy based on transient electromagnetic power compensation.

Area of Science:

• Electrical Engineering
• Power Systems
• Control Theory

Background:

• Virtual synchronous generators (VSGs) enhance grid inertia but can lead to active power oscillations during disturbances.
• Existing control strategies may not fully address transient stability issues.

Purpose of the Study:

• To propose an improved VSG control strategy and a model order reduction method.
• To enhance the transient stability and damping of grid-connected VSG systems.
• To provide quantitative design criteria for system parameters.

Main Methods:

• Established a closed-loop active power small-signal model for the VSG system.
• Utilized root locus analysis to assess the impact of transient electromagnetic power compensation on stability.
• Reduced the system model order to an equivalent second-order model by neglecting less influential terms.
• Developed quantitative design criteria based on the reduced-order model.

Main Results:

• The proposed transient electromagnetic power compensation strategy increases system transient equivalent damping.
• The strategy effectively mitigates active power oscillations without compromising primary frequency modulation.
• The model reduction method yields an accurate second-order equivalent model for VSG systems.
• Experimental validation confirmed the theoretical analysis and effectiveness of the proposed methods.

Conclusions:

• The novel VSG control strategy with transient electromagnetic power compensation significantly improves power system stability.
• The model order reduction technique provides a simplified yet accurate representation for VSG analysis and design.
• The findings offer practical guidelines for designing robust VSG control systems.