Wind Energy Conversion Systems (WECS) are penetrating into Microgrids as they fit well to the concept of Distributed Generation. The variable speed Doubly Fed Induction Generators (DFIG) are most frequently used. Chan...
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Wind Energy Conversion Systems (WECS) are penetrating into Microgrids as they fit well to the concept of Distributed Generation. The variable speed Doubly Fed Induction Generators (DFIG) are most frequently used. Changing the speed (DFIG) according to the aerodynamic law, maximum wind power can be harvested. The paper investigates the way of speed change by rotor voltage in steady-state and in transient. Steady state characteristics and simulation results for dynamic behavior are included.
In this paper, a systematic synthesis method for Takagi-Sugeno fuzzy dynamic output feedback controller is proposed for T-S fuzzy plants with actuator saturation. By using the deadzone function, both the T-S fuzzy pla...
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In the paper an output control approach for a class of nonlinear MIMO systems is presented. A multicopter with four symmetrical rotors, i.e. a quadcopter, is chosen to illustrate effectiveness of the proposed adaptive...
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ISBN:
(纸本)9781479959020
In the paper an output control approach for a class of nonlinear MIMO systems is presented. A multicopter with four symmetrical rotors, i.e. a quadcopter, is chosen to illustrate effectiveness of the proposed adaptive control approach based on the high-gain principle so-called “consecutive compensator”. Output controller is designed by decomposition of the mathematical model on two parts. The first one is a static MIMO transformation (more precisely, in the considering case a system of linear equations which relates lift forces generated by the actuators and virtual control inputs). The second one is a few SISO channels. Such trick allows to design a control law in two steps. At the first step we design virtual controls for each SISO channel. Here we apply the mentioned systematic approach “consecutive compensator”. And then after the inverse MIMO transformation we get a set of real lift forces.
We present a new stabilization approach for a linear plant with the input delay and an unknown multisinusoidal disturbance affected the input and the output. To solve this problem, we combine the well-known predictor ...
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ISBN:
(纸本)9781479974108
We present a new stabilization approach for a linear plant with the input delay and an unknown multisinusoidal disturbance affected the input and the output. To solve this problem, we combine the well-known predictor feedback approach with the state observer and adaptive scheme that identifies the frequency of the disturbance. Compared to the existing approaches, our adaptive scheme is applicable to plants that are unstable, non-minimum phase, and have an arbitrary relative degree.
This paper presents recently introduced concept of Learning Entropy (LE) for time series and recalls the practical form of its evaluation in real time. Then, a technique that estimates the increased risk of prediction...
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ISBN:
(纸本)9781479914821
This paper presents recently introduced concept of Learning Entropy (LE) for time series and recalls the practical form of its evaluation in real time. Then, a technique that estimates the increased risk of prediction inaccuracy of adaptive predictors in real time using LE is introduced. On simulation examples using artificial signal and real respiratory time series, it is shown that LE can be used to evaluate the actual validity of the adaptive predicting model of time series in real time. The introduced technique is discussed as a potential approach to the improvement of accuracy of lung tumor tracking radiation therapy.
Field Oriented control (FOC) technique is one of the mostly applied algorithm to control the speed and the flux of a three-phase electric drive. The paper focuses on high speed or high-pole count motor FOC drives when...
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ISBN:
(纸本)9781479924004
Field Oriented control (FOC) technique is one of the mostly applied algorithm to control the speed and the flux of a three-phase electric drive. The paper focuses on high speed or high-pole count motor FOC drives when both the sampling over reference frequency ratio F and the carrier over reference frequency m f is low. The paper presents that the stability range of a speed sensor-less FOC motor drive can be extended by recalculating the reference signal of the Space Vector Modulation (SVM) algorithm at the negative peak of the carrier signal as well by approximating the rotor flux angle change over one half carrier period. The result was verified by computer simulations and laboratory measurements.
In the paper a comparative analysis is carried out on seven different self-excitation methods that have been developed in the past decades taking into account the technical and economical features of the methods compa...
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ISBN:
(纸本)9781479959020
In the paper a comparative analysis is carried out on seven different self-excitation methods that have been developed in the past decades taking into account the technical and economical features of the methods compared. A novel solution based on resonant circuit application is described in more detail, and the theoretical considerations have been confirmed by computer simulations and laboratory test results.
The paper studies the problem of finding a realization of a nonlinear system described by a higher-order differential equation in the so-called feedforward form. A necessary and sufficient condition for the problem to...
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A second order sliding mode control design for a mobile hydraulic system, including bounded model uncertainties and external disturbances, is the subject of study. The proposed algorithm provides a continuous control ...
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ISBN:
(纸本)9781467360890
A second order sliding mode control design for a mobile hydraulic system, including bounded model uncertainties and external disturbances, is the subject of study. The proposed algorithm provides a continuous control signal, achieving good performance and chattering attenuation in comparison to other sliding-mode-based techniques. The design includes the formulation of a partial stability problem and we provide the required Lyapunov-function-based analysis. Experimental results are performed over an industrial setup and confirm the effectiveness of the methodology. Moreover, promising results of a comparison with the Super-Twisting and PID controllers are presented.
One of the main functions of the human nervous system is the muscles control. The complexity of this function increases for hand and fingers control because of the high diversity and accuracy of the possible motions. ...
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One of the main functions of the human nervous system is the muscles control. The complexity of this function increases for hand and fingers control because of the high diversity and accuracy of the possible motions. Starting from the control mechanisms of the natural muscle we developed a structure of spiking neurons implemented in PCB hardware that is able to drive the elbow of a human-like robotic arm. In order to increase the biological plausibility of the designed robotic arm driving system, the artificial neural network controls artificial muscles that are implemented with Flexinol actuator wires. From our knowledge the control of the actuator wires using spiking neural networks was not performed previously. The results show that the excitatory spiking neurons are able to flex and straighten the artificial elbow by stimulating two antagonistic actuator wires. Moreover, by using inhibitory neurons that modulate the neural excitatory activity the arm mobile segment can be driven to specific positions. Our final goal is the development of a biologically plausible neural structure that is able to easily drive the hand and fingers of a human-like robotic arm by controlling the artificial muscles implemented with actuator wires. This will give important clues for future developments of spiking neural networks that drive robotic arms for performing complex tasks.
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