Robust Nonlinear Control of MMC-VSC for Connection of Energy Resources to Weak Grids with Low SCR

  • سال انتشار: 1396
  • محل انتشار: چهارمین کنفرانس بین المللی فناوری و مدیریت انرژی
  • کد COI اختصاصی: IEAC04_007
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 655
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نویسندگان

Amin 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

چکیده

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

کلیدواژه ها

Voltage source converter, Modular multilevel ،converter, HVDC, control Lyapunov function, finite-time control

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