COI code: IEAC04_007
Paper Language: English
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Authors Robust Nonlinear Control of MMC-VSC for Connection of Energy Resources to Weak Grids with Low SCRAmin Mohammadpour Shotorbani - Faculty of Electrical and Computer Engineering ،University of Tabriz, Tabriz, Iran
Behnam Mohammadi-Ivatloo - Faculty of Electrical and Computer Engineering ،University of Tabriz, Tabriz, Iran
Jaber Fallah Ardashir - Department of Electrical Engineering, Tabriz Branch, ،Islamic Azad University, Tabriz, Iran
Liwei Wang - School of Engineering, University of British Columbia, Okanagan, BC, Canada
Abstract:This paper discuss the application of robust finite-time nonlinear control scheme to voltage source converters (VSCs), to enhance the robustness and transient response of the VSC connected to a weak ac grid. Recently, modular multilevel converter (MMCs) are extensively used to connect large-scale renewable energy resources to grid, through MMC-VSCHVDC systems. Lyapunov stability criterion is used along with the detailed nonlinear model of the grid-connected VSC to derive an effective control scheme which is independent of the ac system strength. Power flow control and DC link voltage control are investigated. Finite-time convergence of the proposed controller provides very fast and accurate tracking capability to the closed-loop VSC system. The robustness of the system is mathematically proved and substantially analyzed in detail, for external disturbances and parameter variations. Average-value model of the VSC is used for simulation. The proposed scheme is applied to control of a modular multilevel converter VSC-HVDC system in both rectifying and inverter modes. Power control, current regulation, and circulating current suppressing control loops of the MMC-VSC are investigated using the proposed FTC scheme. Moreover, performance of the proposed control scheme is evaluated in connecting the grid-side VSC of a large-scale wind farm to a weak grid with a low SCR value at the PCC. The impact of different grid’s strength and the injected active/reactive power on the variations of the PCC’s voltage of a weak grid are investigated. It is shown that the proposed FTC yields fast transient and resilient response, and improves the robustness of the VSC control system in connection to a weak grid
Keywords:Voltage source converter, Modular multilevel ،converter, HVDC, control Lyapunov function, finite-time control
COI code: IEAC04_007
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Mohammadpour Shotorbani, Amin; Behnam Mohammadi-Ivatloo; Jaber Fallah Ardashir & Liwei Wang, 2017, Robust Nonlinear Control of MMC-VSC for Connection of Energy Resources to Weak Grids with Low SCR, 4th International Conference on Technology and Energy Management, تهران, انجمن انرژي ايران, https://www.civilica.com/Paper-IEAC04-IEAC04_007.htmlInside the text, wherever referred to or an achievement of this article is mentioned, after mentioning the article, inside the parental, the following specifications are written.
First Time: (Mohammadpour Shotorbani, Amin; Behnam Mohammadi-Ivatloo; Jaber Fallah Ardashir & Liwei Wang, 2017)
Second and more: (Mohammadpour Shotorbani; Mohammadi-Ivatloo; Fallah Ardashir & Wang, 2017)
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Type: state university
Paper No.: 17389
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