Universal Virtual Synchronous Generator Based on Extended Virtual Inertia to Enhance Power and Frequency Response

Hao Liu, Bo Yang, Song Xu, Mingjian Du and Shuai Lu ()
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Hao Liu: School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Bo Yang: School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Song Xu: School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Mingjian Du: School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Shuai Lu: School of Electrical Engineering, Chongqing University, Chongqing 400044, China

Energies, 2023, vol. 16, issue 7, 1-20

Abstract: Virtual synchronous generators (VSG) are considered a new generation of grid-friendly inverters with the same inertial support characteristics as synchronous generators (SG). However, the inertia support comes with the side effects of power and frequency response deterioration. The existing VSG power oscillation suppression methods have limitations such as complex controller parameter tuning, altering the frequency support characteristics, and power quality degradation. To address these issues, this paper proposes a universal VSG control strategy based on extended virtual inertia (VSG-EVI). Herein, the virtual inertia is no longer a constant or varying number; it is endowed with frequency domain characteristics to improve the VSG transient responses. Moreover, a detailed parameter design process is given in detail. Compared with the conventional VSG (CVSG), VSG-EVI significantly suppress the power and frequency oscillations. Compared with the existing VSG oscillation suppression methods, VSG-EVI addresses the issues of the reduction of frequency support capability, whereas the controller parametric design process is simplified with the proposed intuitive extended virtual inertia. Finally, the proposed VSG-EVI method is thoroughly validated by experiments under both grid-connected and stand-alone modes.

Keywords: virtual synchronous generator; virtual inertia; power control; power oscillation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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