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In order to solve the system overshoot problems in big initial input signal, a new type of linear active disturbance rejection controller (LADRC) is investigated. The stability of the new LADRC is analyzed, and the equivalent transfer function is derived through this paper. The stability conditions that meet the performance requirements are also analyzed. Further more, the comparison between the two...
In this paper, a novel control method is proposed for single-input single-output second-order nonlinear systems. The proposed controller guarantees the system reach to the sliding mode surface from any initial states and converge to origin along the surface in finite time while solving the problem of singularity. Compared with traditional fast terminal sliding mode (FTSM) controller, the proposed...
A dynamical model with multi perturbation factors of unwinding tension was established by analyzing the web press experiment platform. A tension control simulation system was constructed whose actuator is a magnetic powder brake by using MATLAB. A fuzzy adaptive PID controller was designed, and compared with the traditional PID control through experiment. The results show that the fuzzy adaptive PID...
Due to the rapid development of the Internet, research on networked control system (NCS) has attracted much attention. However, when the control is over the network, the communication time delay will reduce the stability and performance of the entire system. This paper presents a comparative study of time delay compensation methods based on a communication disturbance observer (CDOB) architecture...
This paper investigates the use of feedback linearization to develop a control system for regulating the DC voltage and the reactive power of a VSC terminal. Firstly, a direct-quadrature (dq) state-space model of the VSC terminal is established. By analyzing the zero dynamics of the system, the static feedback linearization can be applied when the VSC terminal operates in inversion mode (power flowing...
In this work the synchronous detection and the indirect current-control methods are investigated for determining the reference compensating currents of the shunt active power filter under balanced, unbalanced and distorted source voltage conditions. The three-phase power system with a diode rectifier is simulated. The simulation results are used for comparison.
This paper studies a control mode of multiple UAVs flying in a close-coupled formation for the purposes of fuel reduction and then proposes a two-loop controller design methodology based on a two-time scale design approach: one is a Sliding Mode Controller in outer-loop to track relative position commands and generate body-axis rate commands for the inner loop, the other is a Self-Adaptive Controller...
This paper repots an optimum on-time (OOC) control with predicting correction technique (PCT) for ripple-based buck converter. The switching frequency (FSW) variation is analyzed with completely considering the parasitic resistances of the components and devices. The proposed converter achieved nearly constant switching frequency over a wide load range without extra clock controlled circuits and current...
In this paper, a Model Free Adaptive Control (MFAC) scheme is proposed for automatic car parking systems. The scheme consists of a control algorithm, a parameter estimation algorithm and a parameter reset algorithm. The design of the proposed scheme only uses the input and output (I/O) data, and does not involve any model information of the controlled car. Therefore, the MFAC based automatic parking...
Unlike the traditional dynamic positioning of single marine surface vessel, a local cooperative control scheme is proposed to achieve the dynamic positioning of multiple offshore vessels and rigs subject to the influence of persistent ocean disturbances through a connected communication network. Cooperative dynamic positioning controllers are developed with the aid of a dynamic surface control technique...
This paper presents dynamic surface control for longitudinal dynamics of a generic hypersonic flight vehicle in presence of unknown dynamics. For the attitude subsystem, the minimal-learning-parameter technique is combined with dynamic surface design. The uniform ultimate boundedness stability is guaranteed via Small-gain Theorem. The singularity problem is removed and the simpler adaptive algorithm...
This paper focuses on development of a wheelchair model and further on proposing a novel control strategy based on fuzzy logic control in order to lift the front wheels and maintain system stability in the upright position. A type-1 TSK FLS is first introduced to handle stability when the wheelchair is in an inverted pendulum-like situation. An extra control loop is designed to stop the motion after...
This paper deals with a new technology called Hardware-In-the-Loop (HIL) simulation. It is a method by which a simulation is carried out in real time (RT). In this system, a real product (Inverter) is used as a controller instead of a software-based controller; the power circuit, induction motor and machine (crane) are all modeled and loaded into an RT simulator. In this HIL simulation, the motor...
In public transportation, simulation provides capabilities of investigation of complex interactions between the components of the transportation system, including infrastructure, vehicles, passengers and intelligent transportation system. Although many simulation platforms (either commercial or open source) exist to test, validate and evaluate the performance of control systems, the development of...
In this paper, the design of simulation software and control system for unmanned aerial vehicle (UAV) during aerial refueling is proposed, in which the simulation software is constructed under Microsoft Visual Studio 2010, and control system is designed based on the linear control theory and assumption of relatively small perturbations during the docking. The proposed model has the merits of explicitly...
To improve the performance of the glutamic acid fermentation process, a multivariable adaptive inverse control method is proposed considering nonlinear and multivariable coupling of the fermentation process. According to the characteristics of the fermentation process, the kinetics model and the simplified model are given and the reversibility of the model is analyzed. An adaptive inverse control...
This paper presents the small-signal modeling and controller design of an isolated Quasi-Switched-Capacitor (QSC) dc/dc converter. The converter serves as an auxiliary power supply in automotive applications, connecting the highvoltage battery and the 14 V power net. It employs a front-stage QSC dc/ac circuit with a 3:1 voltage step-down ratio, and a poststage synchronous-rectifier, current-doubler...
An approach to optimize the control parameters for an extended-kanban control system (EKCS) is studied. The EKCS is a Just-in-Time production system that involves the advantages of classical kanban and base-stock control systems. Although EKCS can be modeled as a discrete-time Markov chain, the state space is gigantic even for a single stage production system, making it impossible to numerically compute...
As the power demand is increasing, the PV based microgrid has the important role to full fill the demand of energy today. In PV based microgrid, PV inverter is used to convert dc to ac with novel pulse width modulate control. A PWM is well known and powerful control technique for analog circuits. In this paper, we are discussing about inverter with neural network control to convert dc to 3-Phase ac...
Efficient damping control devices installed in a power system play a vital role in transient stability improvement. This paper presents a comprehensive approach to design and compare the direct and indirect NeuroFuzzy wavelet control schemes for supplementary control of Static Synchronous Series Compensator (SSSC) to damp power system oscillations. Machine rotor speed deviation and its derivative...
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