On active surge control of compression systems via characteristic linearization and model nonlinearity cancellation

A simple approach of active surge control to 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 system’s 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. © 2014 published by itb journal publisher.