Abstract: When the load is reduced to a certain degree，the compressor will produce dramatic instabilities. The instabilities are inherent of axial compression system，including rotating stall and surge.Although the traditional control method can guarantee the security of the compressor，but it narrows the operating range of compressor and seriously influences compressor performance.In order to improve the active control effect on instabilities，first，for the reason of simple structure and conspicuous effect，the close-coupled valve(CCV)was selected as an active actuator to be used in the compressor system in this paper.At the same time the dynamic mathematics model with CCV was built based on the classical MG model and unstationary theory.Then the active control law under conditions of constant speed and non-constant speed was designed based on the backstepping method and was applied to the simulation of the rotating stall and surge with the active control law in different times，then the influence brought by parameter B was evaluated.Finally，the results of the simulation validated the effectiveness of the active control law and proved the high effect of the CCV actuator on the control.

Key words: axial compression system, instabilities, active control, close-coupled valve

摘要： 压缩机工作时，当负荷降低到一定程度时，会产生剧烈的失稳现象。旋转失速和喘振为轴流压缩系统的两类失稳现象，为其固有特性，传统的防喘振控制虽然能确保压缩机的安全运行，但却缩小了压缩机工作范围，使压缩机不能工作在高性能区域。为了改善防失稳现象的控制效果，首先选取结构简单、控制效果明显的紧连控制阀（CCV）作为主动控制执行机构，并基于轴流压缩系统经典MG模型和非定常理论，建立了包含CCV的动态响应数学模型；然后运用反步递推法(backstepping)设计推导了恒转速和变转速情况下抑制压缩系统失稳现象相应的主动控制律；最后针对压缩机恒转速和变转速下的旋转失速和喘振失稳现象在不同时间施加主动控制以及B参数变化的影响等多种情况进行了仿真实验，验证了CCV主动控制律的有效性以及CCV的执行高效性。

关键词: 轴流压缩系统, 失稳, 主动控制, 紧连控制阀