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Aiming at that it is difficult to choose the value of virtual damping(VD) in passivity-based controller of the Boost converter, this paper proposes an approach which can be used to calculate and optimize the value of VD. The range of VD can be determined by constraining overshoot of the current response of Boost converter. The optimal VD can be found in the range of VD by genetic algorithm(GA) and...
This paper examines the accuracy of the zero-order hold (ZOH) model of the digital pulsewidth modulator (DPWM). The influence of the computational delay on the precision of this equivalent DPWM model is discussed in detail. A compensation method is proposed to compensate the deviation of this DPWM model for accurately calculating the stability region with different computational delay and duty-cycle...
This paper introduces a closed-loop control architecture for an impedance control network (ICN) resonant dc-dc converter that regulates the converter's output voltage while achieving soft-switching across wide operating ranges. This architecture is based on enhanced phase-shift control of the ICN converter, in which the inverter and rectifier phase-shifts are simultaneously controlled to regulate...
A design of a feed-forward-based fractional-order model reference adaptive control (FO-MRAC) compensator using a modified MIT rule to control a DC-DC boost converter is presented in this work. As the plant is non-minimum phase, an implementation of the so-called parallel feed-forward configuration is required to make the plant satisfy ASPR (almost strictly positive real) conditions that in turn, allows...
Designing of an effective and an efficient Fractional Order Proportional-Integral-Derivative (FOPID) controller, as a generalization of a conventional PID controller based on fractional order calculus, for an industrial control plant to obtain high-quality performances is of great theoretical and practical significance. This paper presents a new method for optimum tuning of practical FOPID controllers...
Because of nonlinear and strong coupling features, control system of permanent magnet synchronous motor usually requires high robustness, which can be achieved by fractional-order controller with strong ability against disturbances. A tuning approach based on D-decomposition method and maximum sensitivity is proposed to design fractional-order PIλ controller for permanent magnet synchronous motor...
The FOTF toolbox for MATLAB is proposed for research of fractional control systems in this article. For the technical realization of fractional controllers, it is proposed to approximate the transition functions by difference equations. For this purpose, the method of z-transform is used with the discrete integrator approximations. Telescope control system was use as the testing object of investigation...
Aiming at multiple-input multiple-output (MIMO) systems with multiple time delays in the process industry, all-pole approximation is proposed for different time delays in this paper. What is more, in order to reinforce the tracking performance and controller robustness in the case of uncertainty and disturbance, loop transfer recovery method at output side is proposed to realize the multiple-loops...
In Network Control Systems (NCSs), a dual rate controller is an approach that is applied to reduce the influence of packages loss and random delays. If the output measuring sensors is slower than the control action update can be reached, the dual rate controller is used as a possible solution. In this paper, a fuzzy controller will be combined with a dual rate controller in an NCS to regulate the...
The principle of the repetitive control circuit is that the control deviation from the previous interval is added to the control signal of the current time interval. This process is carried out continuously and in this way an asymptotic equality of the output signal time course with the control signal can be achieved. But this process is not always successful. Ensuring convergence of such a process...
This paper presents an adaptive slope compensation method for peak current mode control of digital controlled DC-DC converters, which controls the quality factor of the complex conjugated poles at half the switching frequency. Using quality factor control enables optimization of the dynamic performance and stability of current mode control. The presented method adapt to DC-DC converter operating conditions...
This paper considers the game-theoretic pursuit-evasion problem, where a group of pursuers is required to capture a moving target in airspace in the conditions of random perturbing wind actions. As participants of the game we assume the unmanned flight vehicles (FVs), which mathematical models are determined by transfer functions that describe the double-circuit control system with autopilot and settings...
This study aims to develop a Load Frequency Control (LFC) for a single area power system using a fuzzy logic tuned PI controller. A deviation of frequency value from the standard (±0.5Hz) arises when real power generation fails to supply demand along with network losses. Various LFC studies have been done exploiting control strategies ranging from classical control schemes to soft analysis techniques...
In this paper, we focus on time-delay linear systems with unknown dynamics. The optimal parameters for a feedforward controller are tuned in two degree-of-freedom (2DOF) control structure with fictitious reference iterative tuning (FRIT) which is one of data-driven controller tuning methods. We propose a new method in which Kautz expansion is used to approximate a linear time-delay system as well...
In dq-frame current control scheme for single-phase grid-connected inverters, an orthogonal signal generation (OSG) block is required to generate a virtual orthogonal signal. The OSG block makes the control system complicated and introduces extra disturbance, which deteriorates the dynamic performance. This paper presents a simplified dq-frame current controller for single-phase grid-connected inverters...
This paper introduces a new design method of discrete-time fractional-order PIλ controllers. It is based on using an exact discretization method that always guarantees the implementation of 3rd-order, minimum-phase, and stable discrete-time controllers. The structure of the controller can be considered as an adaptive one since it only depends on the order of the controller, which is one of three tuning...
This paper presents the control system of water level in double tank system with free flow, which uses in its structure a nonlinear model of the plant taking into account the dependence of the time constants on the value of the controlled variable. A model that reflects the properties of an object and is a part of the controller allows significant to shorten the settling time if the liquid is regulating...
In this paper we describe a new approach to the design of Multi-Input Multi-Output (MIMO) controllers which attain predesigned gain and phase margins. This is achieved by considering the Smith-McMillan form of the n×n plant transfer function with diagonal elements Pi(s), designing Single-Input Single-Output (SISO) controllers Ci(s) for the Smith-McMillan plants with corresponding loop gain margins...
This work implements two feedback control systems to stabilize the angular position of the shaft of a torsional plant subjected to torsion. The first control system stabilizes such a position using an IO (Integer Order) compensator, while the second employs a FO (Fractional Order) one. The latter compensator uses the structure (the transfer function) of the former. That is, to obtain the FO compensator...
In this paper, details the functioning of a plant of control, air suspension of a sphere, through which it will analyze its mathematical model, its nonlinear behavior, which must be linearized in a point of operation, to subsequently generate a PID control of it, in order to verify the correct behavior of the plant against several perturbations, their respective testing and simulation using MATLAB...
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