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Stabilization of Back-to-Back Converters in the Presence of Nonlinear and Constant Power Loads

Akrami, Milad | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51605 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mokhtari, Hossein
  7. Abstract:
  8. In this research, a new step-by-step and comprehensive method for the design of back-to-back converters in the presence of nonlinear and constant power loads is proposed. Common methods for the design and control of back-to-back converters consider the design procedure independent of the linearity and dynamic of the load, also, the control system design and performance of the load-side and grid-side inverters of back-to-back converters are assumed to be independent of each other which is shown in this thesis that this assumption is not valid in the presence of nonlinear loads. These methods result in challenges and problems regarding stability and power quality indices of back-to-back converters’ performance. In this thesis, the dynamic model of system is introduced and used for band-width oriented proportional-integral controller design. By the use of converters power quality indices sensitivity analysis, it is shown that the design procedure must consider all effective factors on the converters performance simultaneously to guarantee its proper and stable operation in the presence of all kinds of loads. Finally, with taking all the limits, equations, sensitivity analyses and trade-offs for selecting power electronic elements and controller coefficients into account, a step-by-step and comprehensive procedure for the design of back-to-back converters considering the effective factors simultaneously, is proposed. The performance of the proposed method is evaluated by simulation for a study system using MATLAB/SIMULINK software.
  9. Keywords:
  10. Back-to-Back Converter ; Constant Power Load ; Nonlinear Load ; Stabilization ; Power Quality

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