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Model-Based Simulation of Surge and Active Controller Design of an Industrial Centrifugal Compressor applied in Gas Compression Systems

Khodaparast, Pooya | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42538 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Ghofrani, Mohammad Bagher
  7. Abstract:
  8. Efforts to model and control surge, as the underlying instability of centrifugal compressors, were conducted. Of the three major instabilities in compressors, namely chokage, stall and surge, the latter has a significant role in limiting the available range of operation in centrifugal compressors, which are the most common devices for the transportation of Natural gas. The customary method to circumvent surge, which if occurred, could impose severe, catastrophic and irreversible damages to the machine, is to avoid the zones in which it is likely to develop by means of a recycling system. These often called "surge avoidance" or "surge prevention" schemes have the benefit of high reliability, but sacrifice a continuous energy rate due to the recycle. Active control, however, seeks to stabilize the operating point located to the left of surge line, which by nature is dynamically unstable. In this work, in addition to a brand new scheme to reproduce the compressor performance curve, an active controller was implemented on the model provided to simulate surge phenomena on an industrial centrifugal compressor, wherein the Emotional controller was applied. Results indicated a significant extension of 110 percent for the stable range in the proximity of the design speed, which was the focus the performed case-study
  9. Keywords:
  10. Performance Curve ; Simulation ; Model Based Control ; Aerodynamic Instability ; Centrifugal Compressor

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