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This paper presents a control technique based on structured singular value (μ) approach for a boost converter with voltage-mode control. Boost converter is used in most grid-connected photovoltaic (PV) applications in order to stabilize the fluctuating input voltage. Due to their time-varying uncertainty in the converter structure, control of DC-DC converter is a difficult task. By using this new...
This paper presents a novel distributed control scheme in the general frequency domain framework, in order to not only achieve the stability but also improve consensus performance of the interconnected heterogeneous dynamical systems with time delays. The controller design procedure has four steps. Firstly, the feedback control diagram of the global system and local subsystem are both established...
PID controller is widely used in industrial process control, however, because of improper parameter, most of the PID controllers have failed to meet the control requirements. This paper proposes the parameter tuning method of PID controller based on vector model in the complex plane, the method not only can solve parameters of the controller easily and quickly according to the model of controlled...
This paper presents quantitative feedback theory (QFT) based control and tracking of ball and beam system. QFT is a frequency domain approach using Nichols chart. This technique achieves desired robust design over a specified range of plant uncertainty. QFT is used for the design of robust controllers for the plant with uncertainties in the parameters, input/output disturbances and noises. Ball and...
In this paper, closed loop performance of a system with hard nonlinear limitations is analyzed. In order to adequately control such a challenging process, an Internal Model Control strategy has been implemented. The controller has been applied to a real time process described by a radio satellite antenna. The performance of the closed loop has been evaluated by changing the natural frequency and the...
This paper deals with the H2/H∞-approach to design of the equipment devices operated at unmanned aerial vehicles in difficult conditions of real operation. The task is formulated as the vector optimization problem. The robust optimization algorithm and results of its execution are represented.
PID control schemes have been widely used in most process industries. Since the control performance strongly depends on PID parameters, it is important to suitably choose a set of these parameters. Especially, it is difficult to determine these parameters in the case where the time-delay is unknown and/or large. On the other hand, it is well-known that the generalized predictive control(GPC) design...
In this paper an attempt is made to design a dynamic state feedback based decoupler (PD compensator) for MIMO system. The condition for decoupling and mathematical expressions for the set of dynamic state feedback gain matrices (K, F and Γ) for a given decoupled system transfer function matrix is formulated. Further the robustness has been tested.
The paper presents an approach to design a robust PI controller for an active suspension system with uncertain parameters. To take care of parametric uncertainty in the system, the transfer function of controlled system is modified in the interval plants by using the kharitonov's theorem of stability. The stability region of the system is found by plotting the (kp, ki) - plane which is plotted using...
In this survey paper, different approaches to deal with input/output time delayed disturbed plants are considered. First, the classical Smith predictor and some of its modifications to deal with unstable and non-minimum phase plants are reviewed, being applied to single-input-single-output (SISO) plants. Then, combining the internal and external representation, a generalized dead-time compensator...
Control of active magnetic bearings is an important area of research. In this paper authors present the methodology of design, discretization and implementation PIλD controller for magnetic levitation system. Implementation on the laboratory system was performed to validate the presented methodology. The presented methodology is promising and can be successfully used in other control systems.
In this paper, a robust nonlinear tracking control design for an ionic polymer metal composite (IPMC) is proposed by using a multi-objective particle swarm optimization-based robust right coprime factorization approach. Addressing the difficult in obtaining the PI control parameters (Kp, Ki) of the former proposed nonlinear robust tracking control system based on PI-based robust right coprime factorization...
Second level adaptation using multiple models for the adaptive control of linear systems with unknown parameters was introduced in [1], and its robustness properties were discussed in [2]. In both cases, the plant, the identification models, and the reference model were assumed to be described by state equations in companion form, with all state variables accessible.
This paper deals with the problem of fixed-order controller design of LTI continuous-time and discrete-time polytopic systems via homogeneous polynomially parameter-dependent Lyapunov matrices. The proposed method is based on the concept of Strictly Positive Realness (SPRness) of a transfer function depending on a parameter-dependent gain. To convert the problem to a set of LMI conditions, the parameter-dependent...
In this paper, a novel robust tracking control (RTC) approach is developed for networked control systems (NCSs) included uncertainties, such as random delays, packet losses and disturbances. Different from the existing control techniques for NCSs, the RTC scheme is a hybrid robust controller with variable sampling period. Firstly, the delay and packet loss information are online updated. This information...
This paper addresses the issues of security and vulnerability of links in the stabilization of networked control systems from robustness viewpoint. As is done in recent research, we view network security as a robustness issue. However, in this paper we shed considerable new insight into this topic and offer a new and differing perspective. We argue that ‘robustness’ aspect is a common theme related...
Sufficient conditions for stability of feedback interconnections of negative imaginary systems are derived via an integral quadratic constraint (IQC) approach. These extend existing results in the literature by exploiting the flexibility present at the static and infinite frequencies to reduce conservatism. Negative imaginary transfer functions with poles on the imaginary axis are accommodated using...
Absolute stability of bilateral teleoperation has been investigated under the assumption that both human and environment behave as passive systems. This robust design is required since human and environment must be considered as unknown systems at the design stage. If this approach is widely used in the literature, it leads to conservative conditions. Recently, teleoperation has been described in...
The paper proposes and implements a performance control structure as a answer to cascade reservoir processes. It is elaborated by relying on the combined decentralized/distributed - decoupled method specific to processes with multiple variables. In every important designing step for the structure parts, we show a few illustrative numerical examples. The intended means is set against the well-known...
The work deals with design and application of robust controllers for a shell-and-tube heat exchanger. The heat exchanger is used for pre-heating of petroleum by hot water. The control objective is to keep the outlet temperature at a reference value. Two robust control techniques are used. In the first approach the robust PI controller design is based on plotting the stability boundary locus in the...
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