Design of Active Magnetic Bearing for Industrial Size Compressor System using Kalman Filter Based Optimal Controller

Anti-surge controller has a very important role in industrial size compressor system to avoid the occurrence of a surge phenomenon. This anti-surge controller can be constructed using a component known as Active Magnetic Bearing (AMB), which can also provide a better efficiency for the overall compressor system compared the conventional bearing. The AMB consists of two components, a thrust magnetic bearing (TMB), and a radial magnetic bearing (RMB). The discussion presented in this paper will mainly focus on the design of the proposed RMB controller system, which is essential in AMB based anti-surge controller, for the industrial size compressor system. The RMB controller system consists of 3 main components, LQR controller, Kalman filter, and automatic compressor trip system. The RMB controller system helps to stabilize the rotor radial position and protect the compressor system when the rotor radial displacement is too far from its nominal value. The simulation result shows that the proposed system has a good performance to stabilize the rotor radial position. The simulation result also shows that the automatic compressor trip system can properly generate an appropriate output command when the rotor displacement is outside the permitted value.