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Transient Stability Analysis of DC Off-Grid Photovoltaic Hydrogen Production Systems Considering Electrolyzer Operating States.

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Title: Transient Stability Analysis of DC Off-Grid Photovoltaic Hydrogen Production Systems Considering Electrolyzer Operating States.
Authors: Kong, Lingguo1 (AUTHOR) klgwin@126.com, Ding, Yuxuan1,2 (AUTHOR), Tian, Yangjin2,3 (AUTHOR), Xu, Guizhi1,3 (AUTHOR)
Source: Energies (19961073). May2026, Vol. 19 Issue 9, p2013. 22p.
Subject Terms: *Dynamic stability, *Lyapunov stability, *Hydrogen production, *Nonlinear dynamical systems
Abstract: This paper investigates the transient stability characteristics of a DC-coupled off-grid photovoltaic hydrogen production system. A nonlinear state-space model of the system is established by integrating the photovoltaic generation unit, the energy storage unit, and the electrolyzer unit. To enhance system dynamic performance, a virtual DC machine (VDCM) control strategy is introduced for the energy storage converter. Based on the nonlinear system model, a Takagi–Sugeno (TS) fuzzy model is constructed to approximate the system dynamics, and the largest estimated domain of attraction (LEDA) is derived using Lyapunov stability theory. Simulation studies are conducted to evaluate system stability under sudden photovoltaic power fluctuations caused by environmental disturbances, and the obtained LEDA is compared with the simulated attraction domain and the power boundary derived from the Lyapunov eigenvalue method. The results show that the LEDA obtained from the TS fuzzy model can effectively estimate the stability boundary of the system, although it remains slightly conservative. Furthermore, the impacts of VDCM control parameters and electrolyzer operating states on system stability are analyzed. Simulation results demonstrate that appropriate adjustment of system parameters can enlarge the LEDA and significantly improve the transient stability of the off-grid photovoltaic hydrogen production system. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 193715909
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Transient Stability Analysis of DC Off-Grid Photovoltaic Hydrogen Production Systems Considering Electrolyzer Operating States.
– Name: Author
  Label: Authors
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  Data: <searchLink fieldCode="AR" term="%22Kong%2C+Lingguo%22">Kong, Lingguo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> klgwin@126.com</i><br /><searchLink fieldCode="AR" term="%22Ding%2C+Yuxuan%22">Ding, Yuxuan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tian%2C+Yangjin%22">Tian, Yangjin</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xu%2C+Guizhi%22">Xu, Guizhi</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)
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  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. May2026, Vol. 19 Issue 9, p2013. 22p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Dynamic+stability%22">Dynamic stability</searchLink><br />*<searchLink fieldCode="DE" term="%22Lyapunov+stability%22">Lyapunov stability</searchLink><br />*<searchLink fieldCode="DE" term="%22Hydrogen+production%22">Hydrogen production</searchLink><br />*<searchLink fieldCode="DE" term="%22Nonlinear+dynamical+systems%22">Nonlinear dynamical systems</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This paper investigates the transient stability characteristics of a DC-coupled off-grid photovoltaic hydrogen production system. A nonlinear state-space model of the system is established by integrating the photovoltaic generation unit, the energy storage unit, and the electrolyzer unit. To enhance system dynamic performance, a virtual DC machine (VDCM) control strategy is introduced for the energy storage converter. Based on the nonlinear system model, a Takagi–Sugeno (TS) fuzzy model is constructed to approximate the system dynamics, and the largest estimated domain of attraction (LEDA) is derived using Lyapunov stability theory. Simulation studies are conducted to evaluate system stability under sudden photovoltaic power fluctuations caused by environmental disturbances, and the obtained LEDA is compared with the simulated attraction domain and the power boundary derived from the Lyapunov eigenvalue method. The results show that the LEDA obtained from the TS fuzzy model can effectively estimate the stability boundary of the system, although it remains slightly conservative. Furthermore, the impacts of VDCM control parameters and electrolyzer operating states on system stability are analyzed. Simulation results demonstrate that appropriate adjustment of system parameters can enlarge the LEDA and significantly improve the transient stability of the off-grid photovoltaic hydrogen production system. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=193715909
RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.3390/en19092013
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 22
        StartPage: 2013
    Subjects:
      – SubjectFull: Dynamic stability
        Type: general
      – SubjectFull: Lyapunov stability
        Type: general
      – SubjectFull: Hydrogen production
        Type: general
      – SubjectFull: Nonlinear dynamical systems
        Type: general
    Titles:
      – TitleFull: Transient Stability Analysis of DC Off-Grid Photovoltaic Hydrogen Production Systems Considering Electrolyzer Operating States.
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            NameFull: Tian, Yangjin
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            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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              Value: 19
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              Value: 9
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            – TitleFull: Energies (19961073)
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