DOI Number : 10.5614/j.eng.technol.sci.2014.46.3.8
Hits : 3

On Active Surge Control of Compression Systems via Characteristic Linearization and Model Nonlinearity Cancellation

Yohannes S.M. Simamora1,3, Harijono A. Tjokronegoro1,2 & Edi Leksono2

1Instrumentation and Control Graduate Program, Institut Teknologi Bandung
2Engineering Physics Research Group, Institut Teknologi Bandung
Jalan Ganesha 10, Bandung 40132, Indonesia
3Mechanical Engineering Study Program, PoliteknikPurbaya
JalanPancakarya 1,Talang, KabupatenTegal 52193, Indonesia

Abstract. A simple approach of active surge control of compression systems is presented. Specifically, nonlinear components of the pressure ratio and rotating speed states of the Moore-Greitzer model are transferred into the input vectors. Subsequently, the compressor characteristic is linearized into two modes, which describe the stable region and the unstable region respectively. As a result, the systemís state and input matrices both appear linear, to which linear realization and analysis are applicable. A linear quadratic regulator plus integrator is then chosen as closed-loop controller. By simulation it was shown that the modified model and characteristics can describe surge behavior, while the closed-loop controller can stabilize the system in the unstable operating region. The last-mentioned was achieved when massflow was 5.38 per cent less than the surge point.

Keywords: active surge control; compression systems; linear quadratic regulator; nonlinear model; nonlinearity cancellation.

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