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Source: alexandria.tue.nl
File size: 2.1 MB
File type: pdf
Last download on:
Sat May 25, 2013 03:23:46 PM
Short Desciption:
Surge is an aerodynamic flow instability which can lead to the catastrophic failure of the compressor system.
One way to cope with this compressor flow instability is active control. For a laboratory-scale gas
turbine installation, an active surge control system is proposed which consists of a plenum pressure sensor
and a bleedhecycle valve. This work focuses on the selection of a control valve. More specifically, the
required bandwidth and capacity of the valve are specified.
Summary:
To study the influence of the control valve on system behavior, simulations are done with the Greitzer
model which describes the behavior of the nonlinear compression system during surge. This model is
extended with a control valve model which accounts for the control valve dynamics and the effect of valve
saturation. A linear static output feedback controller is used to stabilize the compression system around its
nominal operating point.
The main contributions of this study are the following. First, a systematic approach is presented to determine
the required bandwidth and capacity of a control valve for active surge control. Second, an efficient
control strategy is applied: one-sided control. In this control strategy, the control valve is nominally closed
and only opens to stabilize the system in its nominal operating point. Third, a stability analysis of the
constrained linearized compression system is presented.
Using the bounded static output feedback controller, surge limit cycles are stabilized in the nominal operating
point. Stable operation can be sustained in this point with zero control valve mass flow if disturbances
are absent. From simulations, the minimal bandwidth and capacity of the control valve needed for stabilization
are determined. Surge point mass flow is seen to reduce by approximately 15% with the applied
one-sided control strategy. Furthermore, it is concluded that nonlinear flow curves of the control valve are
unfavorable for active surge control.
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"Valve Selection for Compressor Surge Control"
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