Active fault-tolerant predictive control method for faults of multiple actuators in discrete system

Abstract

The invention discloses an active fault-tolerant predictive control method for faults of multiple actuators in a discrete system, especially provides an active fault-tolerant control method which considers common partial faults of multiple actuators in the discrete control system and combines with a discrete sliding mode observer and a model predictive control. According to an initial state modelof the system, considering the step type disturbance and error, an augmented state model of an embedded integrator is designed and predictive control rules are designed. According to a fault model, asecond-order discrete sliding mode observer is designed to detect fault factors of the faults of the multiple actuator, compensate the predictive control rules, and finally form a complete active fault-tolerant predictive controller. The active fault-tolerant predictive control method for the faults of the multiple actuators in the discrete system accurately estimates the fault factors by designing the second-order sliding mode observer, and designs the predictive control rules by using the model predictive control algorithm, can realize an online optimization of the control rules and effectively improves the control precision of the controlled system, provides good fault tolerance to the fault control system with multiple actuators. The active fault-tolerant predictive control method forthe faults of the multiple actuators in a discrete system is used for the active fault-tolerant control of the faults of the multiple actuators in the discrete system.

Description

technical field [0001] The invention relates to an active fault-tolerant predictive control method aiming at failure of multiple actuators in a discrete system, and belongs to the technical field of fault-tolerant control of a discrete control system. Background technique [0002] With the rapid development of science and technology and the continuous improvement of actual needs in key fields such as aerospace, large-scale power grids, and industrial automation, the analysis and design of discrete control systems has become an important part of control theory. And security also has higher and higher requirements. Due to various factors such as the large scale of the system, the complexity of its environment, and the inevitable wear and tear, the threat of failure in engineering systems is ubiquitous. The failure of commonly used sensors, actuators, control components, etc. will affect the maintenance of the overall performance of the system, leading to adverse conditions su...

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Problems solved by technology

Predictive control can be used for almost any control problem, but it is most advantageous in the following problems: the dimensionality of the manipulated variable and the controlled variable is very high; both the manipulated variable and the controlled variable need to satisfy physical constraints; the control index changes frequently and / or equipment (sensors / actuators) prone to failure; time-lag systems

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