Research On Fault-Tolerant Control Of Power Distribution System For Separated Floating Bridge

Reliability is an important part when a complexity equipment completing its work. Because the separated fixed floating bridge involved in this paper must guarantee the safety of our army's fords project, its fault-tolerant performance and the reliability appears especially importantly.This paper has carried out the fault-tolerant control research in view of the separated fixed floating bridge control system. On the basis of summary of the existing fault-tolerant control methods, the paper chooses linear matrix inequality method (LMI) to conduct the robust fault-tolerant control method research. The result is suitable for the separated fixed floating bridge with robust fault-tolerant control. The main research content includes:The paper has studied the linear indefinite system based on robust fault-tolerant control system with linear matrix inequality method, and given sufficient condition of the existence of robust fault-tolerant controller, and has given comprehensive design method of the controller. This method has avoided the parameter estimate of space design method and the Riccati design method, thus reduced the conservative nature in the design. If the satisfying controller exists, then a region of the controller is given. In addition, other performances can be considered and designed.The problem of robust and reliable H_∞fault design for linear uncertain systems with time-varying norm-bounded parameter uncertainty and also with actuator failures based on linear matrix inequality(LMI). A H_∞-norm bound constraint on attenuation of augmented disturbances is introduced. Sufficient conditions for the existence of controller are derived. Ranges of consistent indices are analyzed. And effective controller design methods are provided via LMI approach.The establishment of the separated fixed floating bridge dynamics model, the model is a multi-rigid dynamics model. First the establishment preparation knowledge of system model is introduced Newton-Euler method and the application in the model establishment. Specifically the establishment of the separated fixed floating bridge model and floating bridge structure composition are analyzed. Finally the stress between the bridge structure and the binding force between the power boat and the span is analyzed. The floating bridge kinematics model and the posture dynamics model have established in this foundation, and the model is carried on simplification aims at the model's physical background and the control system design method's request.The above theory is applied in the separated fixed floating bridge control system robust fault-tolerant controller's design. First the simplification model is transformed to the state space equation form, and the split-ring model simulation is done to observe the accuracy of the model and bridge structure movement without outside control and with the outside wind perturbation and the fluent perturbation situation. The controller is designed separately for the fault condition of execution system device, and does mathematical simulation over the algorithm. The result shows that whether the execution system device under fault condition or not, robust fault-tolerant control makes both pointing precision and stability precision of floating bridge position control meets the requirements before fault condition occurs.