Frequency Stability Analysis of Grid-Forming PMSG Based on Virtual Synchronous Control

A small-signal model of a virtual synchronous generator (VSG) control system for wind turbines, which considers the rotor speed regulation characteristics, has been established in this paper. Additionally, the damping torque coefficient expression of the VSG based permanent magnet synchronous genera...

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Bibliographic Details
Published in:IEEE access 2024, Vol.12, p.84134-84148
Main Authors: Meng, Qingtian, Ren, Yongfeng, Liu, Huiqiang
Format: Article
Language:English
Subjects:
Control systems
Damping
damping torque coefficient
Frequency stability
Mathematical models
Maximum power tracking
Mechanical properties
Permanent magnets
Power system stability
Rotor speed
Rotors
Source dynamics of wind turbines
Stability analysis
Synchronous generators
Synchronous machines
virtual synchronous control
Voltage control
Wind turbines
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Summary:A small-signal model of a virtual synchronous generator (VSG) control system for wind turbines, which considers the rotor speed regulation characteristics, has been established in this paper. Additionally, the damping torque coefficient expression of the VSG based permanent magnet synchronous generator (PMSG) was derived. The critical factors affecting the frequency stability of the wind turbine system in the maximum power point tracking (MPPT) mode were analyzed. Furthermore, it has been clarified that when the DC voltage is controlled by the generator-side-converter, the mechanical characteristics of the generator can weaken the wind turbine's capability to damp the power oscillation. The minimum damping value of the VSG control system has been determined, which can provide a reference for the deployment of grid-forming PMSGs in industry. Finally, a typical VSG based PMSG system was established in the RT-LAB platform, and the correctness of the conclusions drawn in this paper was verified.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2024.3414424