TY  - EJOU
AU  - Wang, Dianlang 
AU  - Yin, Qi 
AU  - Wang, Haifeng 
AU  - Chen, Jing 
AU  - Miao, Hong 
AU  - Chen, Yihan 

TI  - Improve Strategy for Transient Power Angle Stability Control of VSG Combining Frequency Difference Feedback and Virtual Impedance
T2  - Energy Engineering

PY  - 2025
VL  - 122
IS  - 2
SN  - 1546-0118

AB  - As the penetration rate of distributed energy increases, the transient power angle stability problem of the virtual synchronous generator (VSG) has gradually become prominent. In view of the situation that the grid impedance ratio (R/X) is high and affects the transient power angle stability of VSG, this paper proposes a VSG transient power angle stability control strategy based on the combination of frequency difference feedback and virtual impedance. To improve the transient power angle stability of the VSG, a virtual impedance is adopted in the voltage loop to adjust the impedance ratio R/X; and the PI control feedback of the VSG frequency difference is introduced in the reactive power-voltage link of the VSG to enhance the damping effect. The second-order VSG dynamic nonlinear model considering the reactive power-voltage loop is established and the influence of different proportional integral (PI) control parameters on the system balance stability is analyzed. Moreover, the impact of the impedance ratio R/X on the transient power angle stability is presented using the equal area criterion. In the simulations, during the voltage dips with the reduction of R/X from 1.6 to 0.8, Δ<i>δ</i> <sub>1</sub> is reduced from 0.194 rad to 0.072 rad, Δ<i>f</i><sub> 1</sub> is reduced from 0.170 to 0.093 Hz, which shows better transient power angle stability. Simulation results verify that compared with traditional VSG, the proposed method can effectively improve the transient power angle stability of the system.
KW  - Transient synchronous stability; virtual synchronous generator; impedance ratio

DO  - 10.32604/ee.2025.057670