基于数学形态学的火电厂执行器恒增益故障诊断

Mathematical Morphology-based Diagnosis of Constant Gain Fault of Actuators in Thermal Power Plants

以主蒸汽调节阀为研究对象,简要介绍了数学形态学的基本原理,针对火电厂最常见的执行器故障之一的恒增益故障,给出了基于数学形态学的诊断方法。该方法能够充分利用执行器本身的信息,不需要建立精确的数学模型,也无须采集大量的特征故障样本,所需的执行器指令信号及反馈信号数据都可从DCS系统中直接获得,有利于工程实现。通过仿真实例证明了方法的有效性。

Taking main steam regulating valve as the research object,this paper briefly describes basic principle of mathematical morphology,and gives a mathematical morphology-based diagnosis method for one of the most common actuator faults in thermal power plants,i.e.,constant gain faults.The method can make full use of information of actuator itself,without establishing an accurate mathematical model and collecting a large number of characteristic fault samples.The required actuator command signal and feedback signal data can be readily obtained from DCS system,which is conducive to engineering implementation.The effectiveness of the proposed method is proved by an exemplary casual simulation.