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Robust Control Scheme for a Grid Connected DG System under Weak Grid Conditions

Mahdian Dehkordi, Nima | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43173 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Namvar, Mehrzad; Karimi, Hoshang
  7. Abstract:
  8. Three-phase voltage source converter (VSC) is vastly utilized in the renewable energy resource and distributed generation (DG) systems interface units due to its high controllability and flexibility. Because of the high nonlinear nature of the system, the gird-connected inverter shows poor performance if the conventional control scheme are used. In this thesis, a new control scheme based on backstepping strategy is presented for control of a grid connected DG systems. The proposed scheme is responsible for regulating the active and reactive power components of the VSC power of the DG system. The VSC of the DG system is connected to a stiff utility grid through an L-type filter. In the first case it is assumed that the system parameters are fixed and known and a backstepping procedure is applied to regulate the power components appropriately. In the second case the system parameters, i.e., the DC capacitor and line inductance are assumed to be unknown. In this case a new adaptation law is exploited to improve the system performance in presence of uncertainties. Finally, the performance of the proposed nonlinear control strategy is verified using case study carried out in Matlab and Simulink/SimPowerSystems. The result shows that the proposed nonlinear controller is highly robust with respect to the system parameter uncertainties and external disturbances
  9. Keywords:
  10. Dispersed Generation ; Voltage Sourced Converter ; Robust Control ; Adaptive Control ; Grid Connected State

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