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

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-02-22
Major/Subject
Mcode
Degree programme
Language
en
Pages
21
Series
Energies, Volume 14, issue 4
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.
Description
Keywords
Virtual synchronous generator, VGS, Virtual inetrtia, 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
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Citation
Dashtaki , M A , Nafisi , H , Khorsandi , A , Hojabri , M & Pouresmaeil , E 2021 , ' Dual Two-Level Voltage Source Inverter Virtual Inertia Emulation: A Comparative Study ' , Energies , vol. 14 , no. 4 , 1160 . https://doi.org/10.3390/en14041160