Stability Analysis Of Plant-based Networked Control System

Networked Control System is a real time feedback control system, which is the further development of computer control system, and is the spread and application of computer network in control domain. With the introducing of network communication, network delay and packet dropout can degrade the performance of control system and can even destabilize the system. So the stability analysis of NCS with the delay and packet dropout is the important part in the studying domain of NCS.For the wrong order of data packets in NCS, The additional buffer method is put forward to deal with the problem in this report. The Markov characteristic of delay in NCS is analyzed, the evaluation method of element in state transition matrix is given when the wrong order of data packet is considered, Jump linear systems methods are used to analyze the stability of NCS, the sufficient and necessary conditions for stochastic stability of NCS are presented.For the influence of network-induced delays and packet dropout in the NCS, a combination of compensation and estimation is proposed to solve the problem. The combination of compensation and estimation is added at the controller unit to improve the performance of control system, a sufficiency condition of the system exponential stability is derived. Simulation results indicate that the approach can effectively improve the control system performance.For the plant is the descriptor system, the stability of the NCS is analyzed in this report. When modeling, the coefficient matrix of the model is established using the distribution of the solution of the primary coefficient matrix, via introducing the new augmented state vector, the state transferred matrix is derived, and the sufficiency and necessity condition of the system exponential stability is derived. The correctness of the theory is proved with the simulation result.