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

Mohammad Ali Dashtaki, Hamed Nafisi, Amir Khorsandi, Mojgan Hojabri, Edris Pouresmaeil*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.
Original languageEnglish
Article number1160
Number of pages20
JournalEnergies
Volume14
Issue number4
DOIs
Publication statusPublished - 22 Feb 2021
MoE publication typeA1 Journal article-refereed

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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