Dual Two-Level Voltage Source Inverter Virtual Inertia Emulation: A Comparative Study

Mohammad Ali Dashtaki, Hamed Nafisi, Amir Khorsandi, Mojgan Hojabri and Edris Pouresmaeil
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Mohammad Ali Dashtaki: Department of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran 15875-4413, Iran
Hamed Nafisi: Department of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran 15875-4413, Iran
Amir Khorsandi: Department of Electrical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran 15875-4413, Iran
Mojgan Hojabri: Competence Center of Digital Energy & Electric Power, Institute of Electrical Engineering (IET), Lucerne University of Applied Sciences and Arts, 6048 Horw, Lucerne, Switzerland
Edris Pouresmaeil: Department of Electrical Engineering and Automation (EEA), Aalto University, 02150 Espoo, Finland

Energies, 2021, vol. 14, issue 4, 1-20

Abstract: In this paper, the virtual synchronous generator (VSG) concept is utilized in the controller of the grid-connected dual two-level voltage source inverter (DTL VSI). First, the topology of the VSG and the DTL VSI are presented. Then, the state-space equations of the DTL VSI and the grid-connected two-level voltage source inverter (TL VSI), regarding the presence of the phase-locked loop (PLL) and the VSG, are given. Next, the small-signal modeling of the DTL VSI and the TL VSI is realized. Eventually, the stability enhancement in the DTL VSI compared with the TL VSI is demonstrated. In the TL VSI, large values of virtual inertia could result in oscillations in the power system. However, the ability of the DTL VSI in damping oscillations is deduced. Furthermore, in the presence of nonlinear loads, the potentiality of the DTL VSI in reducing grid current Total Harmonic Distortion (THD) is evaluated. Finally, by using a proper reference current command signal, the abilities of the DTL VSI and the TL VSI in supplying nonlinear loads and providing virtual inertia are assessed simultaneously. The simulation results prove the advantages of the DTL VSI compared with the TL VSI in virtual inertia emulation and oscillation damping, which are realized by small-signal analysis.

Keywords: Virtual Synchronous Generator (VSG); Virtual Inertia; Dual Two-Level Voltage Source Inverter (DTL VSI); Two-Level Voltage Source Inverter (TL VSI); small signal stability analysis; stability enhancement; Total Harmonic Distortion (THD); oscillation damping (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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