Pre-synchronization Control Method for Virtual Synchronous Generator Based on Power Matching and Self-adaptive Inertia
[1]XING Pengxiang,JIA Xuanyue,XU Changqing,et al.Pre-synchronization Control Method for Virtual Synchronous Generator Based on Power Matching and Self-adaptive Inertia[J].Journal of Zhengzhou University (Engineering Science),2023,44(03):71-77.[doi:10.13705/j.issn.1671-6833.2023.03.015]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
44卷
Number of periods:
2023 03
Page number:
71-77
Column:
Public date:
2023-04-30
- Title:
- Pre-synchronization Control Method for Virtual Synchronous Generator Based on Power Matching and Self-adaptive Inertia
- Keywords:
- virtual synchronous generator; operation mode switching; pre-synchronization control; self-adaptive in; ertia; oscillation suppression
- CLC:
- TM73
- DOI:
- 10.13705/j.issn.1671-6833.2023.03.015
- Abstract:
- It was necessary for the virtual synchronous generator (VSG) to be synchronized with the grid when it switched from off grid mode to grid connected mode. In this study, a modified pre-synchronization control method based on power matching and self-adaptive inertia for the VSG was proposed to improve its stability after grid connection. The proposed method took the amplitude and frequency of grid voltage as the reference value for the VSG output voltage, and then adjusted its output power reference value according to the local load power, thus the voltage frequency and amplitude of the VSG could be regulated to be synchronized with the grid. Besides, feedback control of phase deviation with PI controller was applied in the frequency control loop to achieve phase synchronization. With this method, the output power corresponding to the steady-state operation point of the VSG in grid connected mode was consistent with that before grid connection, and the output power step after the VSG connected to the grid could be avoided. While, when the VSG connected to grid in non-ideal situation, power and frequency oscillations would occur in the synchronization process, so time-varying inertia was introduced in this study to accelerate the VSG to stable state. A simulation model was constructed based on MATLAB / Simulink and simulation results indicate that the proposed method can maintain the same steady-state output power before and after the VSG connected to grid, besides, oscillation time after the VSG connected to grid in non-ideal situation could be reduced by about 60%, which proved the proposed method effective.
- References:
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Last Update:
2023-05-09