Multifunctional Control of Wind-Turbine Based Nano-Grid Connected to Distorted Utility-Grid

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Abstract

This paper proposes a multifunctional control strategy and associated control algorithms for distributed wind-turbine (WT) based nano-grids connected to a distorted utility-grid. The contribution is on a new strategy with innovative control algorithms to coordinate multiple converters for a multitasking operation of the nano-grids. The novelty is on a unique control design with feasibilities: maximizing the generated power from WT, maintaining power quality in both ac- and dc-sides under critical conditions of the power grid, and improving power quality against distortion from local nonlinear loads under a reduced switching frequency. A robust fast-dynamic predictive control method is developed for current controllers to fulfil the multifunction. Unconstrained deadbeat control inputs are derived in twofold targets: ensuring fast dynamic response and significantly reducing both the computation and switching frequency for finite predictive control. The control system is applied on a permanent-magnet synchronous generator (PMSG) WT-based nano-grid connected to a distorted utility-grid. An OPAL-RT-based real-time platform is used for comparative studies among the proportional integration (PI) control, finite predictive control (FS-MPC), and proposed control method. The performance verification exhibits the power quality improvement in both the nano- and utility-grids under critical conditions via high-performed regulation of currents, voltages, reactive power, and rotor-speed of the PMSG-WT.

Original languageBritish English
Pages (from-to)576-589
Number of pages14
JournalIEEE Transactions on Power Systems
Volume37
Issue number1
DOIs
StatePublished - 1 Jan 2022

Keywords

  • Deadbeat control
  • distortion
  • finite predictive control
  • harmonic
  • permanent magnet synchronous generator (PMSG)
  • unbalanced and distorted grid
  • wind energy conversion system

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