Bjørnar Bøhagen

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A globally exponentially stable (GES) observer for the mass flow in a compression system is proposed. Further, a previously proposed active surge control scheme is shown to be GES. This nonlinear control scheme employs the drive torque of the compressors drive unit as the control variable in an active surge control system. The controler is based on feedback(More)
In this paper we present a novel globally exponentially stable (GES) mass flow observer for compression systems. A nonlinear separation principle for a class of controllers for the compression system is shown, allowing a control law and the proposed observer to be tuned separately. The results are supported by simulations and experiments. I. BACKGROUND(More)
This thesis addresses modeling and active surge control of a simple compression system, using only the drive system of the compressor for actuation. Theoretical results are validated by experiments on a test rig that was built as a part of this work. Control laws are derived in two stages. First all system states, such as pressure mass ‡ow and impeller(More)
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