Compressor Active Stability Control Based on Backstepping Sliding Mode Control

Aiming at the surge and rotating stall of the aero-engine compressor, this paper is concerned with the design scheme of backstepping sliding mode control. First, in order to solve the adverse effects of surge or rotating stall, a compressor model with steady air injection as the actuator is established. Next, based on the basic principles of backstepping control and sliding mode control, the control system is designed according to Lyapunov stability, and appropriate control parameters are selected to make the designed control system asymptotically stable. In the end, an active stability controller of backstepping sliding mode algorithm is designed. Finally, it is verified by simulation. The simulation results show that the designed controller can effectively suppress the unstable disturbance of the compressor in the initial state, and has faster response time and stronger robustness to external disturbances than other algorithms.

1 Introduction

Compressor, as a kind of machinery to increase fluid pressure, is widely used in petrochemical, aerospace, electronics industry and other industries. Compressor is one of the basic components of aeroengine. Its aerodynamic stability restricts the stable working range of aeroengine. According to the basic principle of compressor, at a given speed, with the gradual reduction of flow rate, air separation will occur in the compressor blade channel, resulting in aerodynamic instability. This phenomenon will limit the operation range of aero-engine, reduce the efficiency of the system, and even damage the whole system. Therefore, in order to avoid compressor instability, the compressor active stability control technology has gradually become a research hotspot in this field.