Research On Optimal State Estimation Strategy With Distributed Controllers Based On Kalman Filtering

Networked Control Systems(NCSs)is a real-time closed-loop feedback Control system composed of sensors,controllers,actuators,etc.According to the different transmission media in the Network,the Network Control System can be divided into Wired Network Control System(WNCS)and Wireless Network Control System(WiNCS).However,with the function of control system is more and more perfect,combined with the integration of wireless network and communication technology,in the process of data transmission due to the limitation of network bandwidth and the influence of the network is not stable,the data transmission will inevitably produce network time delay,packet loss,quantization error,and many other problems,these problems will not only destroy the stability of the control system,and on the analysis and design of the WiNCS has brought many difficulties.At present,the research on optimal control strategy of wireless network is still in the study of single controller,and there are few researches on the wireless networked control system of distributed multicontroller.Aiming at the above problems,this paper puts forward the optimal control strategy design scheme based on distributed multi-controller.In this paper,a multicontroller optimal state estimation control strategy based on kalman filtering algorithm is proposed for the condition that the controller state is not completely knowable.The main contents of this paper are as follows:(1)Optimal control strategy design method for distributed multi-controller based on full state information.At present,the research on the wireless networked control system stays in the system stability and system performance analysis of the single controller.Due to the introduction of the wireless network in the control system,the choice of the location of the controller node in the wireless networked control system is more flexible than that of the traditional point-to-point control systems.Therefore,this paper first proposes a design scheme of optimal control strategy for distributed wireless networked control systems based on full state information.The optimal control strategy is derived by using the system state equation,combining the matrix theory and the quadratic gauss equation.The simulation results show that the distributed multi-controller based on the whole state information has a significant improvement on the stability of the network control system.(2)Study on optimal state estimation strategy with distributed controllers based on kalman filteringBecause of the network bandwidth and the variability of the transmission path,status information in the process of transmission will inevitably produce the problem such as loss of data,so in this paper,based on the full state information,on the basis of the optimal control strategy is proposed based on kalman filter controller design method of optimal control strategy of state estimation.Through the kalman filtering algorithm,the current state of control is estimated by using the former state information.According to the initial state of the system,the state of the system can be estimated by the recursive algorithm.Finally,the optimal control strategy is solved according to the estimated state,and the multi-control under the estimated state is known through the simulated real experiment.The system stability of the system is obviously higher than that of the single controller system,and for the multi-controller wireless network control system,the system using state estimation is significantly better than the control system under the whole state information.