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The rapid development in communication networks made them very attractive to replace conventional wiring in distributed power electronic systems. Parallel DC/DC converters are one of the important distributed power electronic systems. Conventionally, the controllers exchange the control signals through wires. This reduces the reliability and increases the system cost and complexity. Replacing them...
Due to the random and uncertain characteristic of networked induced factors, the performance of networked control systems is seriously affected, which is not merely degraded but also cause system instability. In this paper, a newly enhanced control scheme with an improved smith predictor is proposed to solve the issues caused by the complex and uncertain network conditions. A database is integrated...
In this work, we propose the adaptive state filter for networked control system (NCS) with random induced delay. Communication constraints such as packet losses, random induced delay and quantization problems may be missing possibly in reality certain observations. Therefore, the proposed approach in this work is used ensure estimation in networked control system. We will show also the adaptive state...
Aiming at the problem of time delay in the networked control system, a kind of single neuron adaptive PID controller is applied. The controller does not need to establish accurate model of the controlled object, and is easy to be implemented. Considering the deficiency of fxed proportional coefficient of neuron in single neuron adaptive PID controller, an error function is used as the proportional...
A networked control system is a feedback control system which uses a sharing network for the communication between actuator, sensor and plant. This paper converse the modified smith predictor design for a type of networked control system with time delay. The designed modified smith predictor results have been compared with the PI controller and smith predictor. The networked control system stability...
The model and the stability of the networked control system with time delay and data packet dropout are studied in this paper. Based on the fixed rate of the data packet dropout, the networked control system is modeled as an asynchronous dynamical system(ADS) with rate constraints on events. The sufficient condition to the exponential stability of the networked control system is derived from the conclusion...
In this paper, the problem of stabilization of networked control Markovian jump linear systems with unobservable jump parameter is considered. The model of the networked control Markovian jump linear systems with unobservable jump parameter is first proposed. Then the sample data adaptive control is got, which is formed basing on both the estimation of the jump parameter and the state information...
In this paper, four new control methods of output feedback proportional-integral-derivative (PID) control, dynamical output feedback PID control, state feedback PID control and dynamical state feedback PID control are presented for networked control system (NCS) with time-delay and data packet dropout. The work focuses on the model, stability and PID controller design of NCS with time-delay and dropped...
In the paper, support vector machine is adopted to predict the time delay induced in the networked control system by using time delay historical data. We employ the reaction curve of sine to testify the feasibility of support vector machine. Finally, BP neural network delay predictor is used to compare with support vector machine delay predictor. The testing results demonstrate that the prediction...
The issue of time-delay is of primary importance in different areas of modern control systems and instrumentation such as power systems, industrial process control including the steel and oil industry, machining and metallurgical processes, remotely operated robots and control over computer networks (or as it is also known Networked Control Systems) to name a few. A Networked Control System (NCS)...
This paper concerns the problems of the model, stability and controller design for networked control system (NCS) with dynamical bi-feedback. For NCS with time-delay and packet dropout, two kinds of new control methods, which are dynamical bi-feedback control and dynamical bi-feedback proportion-integral (PI) control, are proposed. The bi-feedback NCS with time-delay and data packet dropout is modeled...
For solving the problem of network induced delay and the measuring difficulty of control state monitoring in Networked Control Systems(NCS), a discrete sliding mode observer (DSMO) is designed in this paper. DSMO is robust despite the presence of bounded uncertainties. Discrete time sliding mode controller base of the DSMO is designed for a type of NCS. The simulation results show that the method...
The performance of a Networked Control System is affected by transmission time delays in the communications network. In order to prove effectiveness of NCS algorithm design, experiment must be carried out. Therefore design and implementation of NCS hardware simulation platform is necessary. In this paper, NCS hardware simulation platform connects three computers, first as an object, second as a controller,...
Network-induced delays in a networked control system (NCS) are stochastic continuous variables that depend on the current network state, which, as an abstract and hidden variable, can not be well defined but can be perceived by the observation of the packet-delay process. We model the network in an NCS as a hidden Markov chain and the network delay as stochastic variable whose probability density...
This paper focuses on the robust stability of networked control systems (NCSs), considering time-delay and sampling period simultaneously. Particular stability problems involving constant and/or time-varying parameters are investigated, and the corresponding stability regions are derived. The methods are based on searching an appropriate Lyapunov matrix and parameter-sweeping. It is shown that the...
For the multi-packet transmission networked control systems with uncertain short time delay and data dropouts, system modeling and control problem is studied on the condition that packet transmission using dynamic scheduling strategy. Supposing that the packet transmission process has the Markov characteristic, it is modeled as a class of discrete Markov jumping system with parameter uncertainty....
Implementing a control system over a communication network induces inevitable time delays and packet dropout that degrade performance and can even cause instability. In this paper, adjustable deadbands are explored as a solution to reduce network traffic in networked control system and we presented a new modeling method for networked control system with random time delays and communication constraints...
Estimation and control in Networked Control Systems (NCSs) is, by and large, an open problem. There are many effects that communication network introduce. In this paper, from both control and communication standpoint, the state estimation problems and the related estimation strategy in NCSs are studied, which mainly concentrate on several constraints: quantization issues, time delays and packet dropped...
Feedback control systems wherein the control loops are closed through a real-time network are called networked control systems. Based on the linear time-invariant process, the mathematic model of networked control systems is set up when the sensor and the actuator are time driven, the is event driven, and the network induced delay is not longer than a sampling period. Using the optimal control theory,...
Networked control system (NCS) is distributed feedback control system which has the advantage of greater flexibility with respect to traditional control systems. Also, it allows for reduced wiring, as well as a lower installation cost. It also permits greater agility in diagnosis and maintenance procedures. Therefor, some problem such as time delay, data package loss, may occur in the network. Transmission,...
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