Fault-tolerant controller design method for one machine infinite bus power supply system

Abstract

The invention relates to the technical field of fault-tolerant controllers, in particular to a fault-tolerant controller design method for a one machine infinite bus power supply system. According tothe design method, a fault-tolerant controller form capable of describing the one machine infinite bus power supply system with controller failure is established as follows: u (t) = alpha (t) K (theta(t)) x (t), wherein x (t) is a system state, K (theta (t)) is a controller gain state, u (t) is a control input, the value of a segmented function alpha (t) comprises two conditions that alpha (t) =1 and alpha (t) = 0, alpha (t) = 1 represents that a controller normally runs in a corresponding time t, and alpha (t) = 0 represents that the controller stops running in the corresponding time t. Whether the one machine infinity bus power supply system is stable or not is fully considered and measurement standards are established, namely, the most suitable fault-tolerant controller can be directly selected according to the measurement standards, so that the system is stable.

Description

technical field [0001] The invention relates to the technical field of fault-tolerant controllers, in particular to a design method of a fault-tolerant controller for a stand-alone infinite bus power supply system. Background technique [0002] In the field of automatic control, the higher and higher requirements for the efficiency, versatility and adaptability of the manufacturing process and industrial applications make the research on the single-unit infinite bus power supply system increase day by day. The dynamic model of the single-machine infinite bus power system is obtained from the classical Park model of the synchronous machine. And in this model, the stator winding resistance, the voltage generated by the magnetic flux, the damping winding, the saturation effect and the efficiency deviation of the speed voltage are ignored, and the transmission line resistance is assumed to be negligible. If the generator set controller is composed of an automatic voltage regula...

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Problems solved by technology

The traditional method is usually to establish corresponding models for the two situations of controller effective and controller failure, and consider the stability of the two models separately, and because the switching between the two models during the operation of the system is actually time-to-time Continuous, so processing between switching points usually makes the system less conservative, and such methods require more computation

Another method is to consider the stand-alone infinite bus power supply system as a linear constant system. Although the system is also stable, the change of the infinite bus voltage is not considered in the model.

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