A novel microgrid control is proposed in the paper. Independent control of active and reactive power for each unit connected to the common microgrid bus is realized in addition to the power sharing in the designed rat...
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A novel microgrid control is proposed in the paper. Independent control of active and reactive power for each unit connected to the common microgrid bus is realized in addition to the power sharing in the designed ratio among the units. The concepts of voltage droop and frequency droop applied widely are incorporated here as well. The price paid for the independent control is the reference frame transformation needed in the novel control.
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.
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.
A basic control course is taught for electrical engineering students at the University of Debrecen, Hungary. Through two semesters the students get a basic knowledge on control concepts. Every week there are 2 hours o...
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The paper deals with the robust control of air-flow in air heating set. The identification is performed using step responses and approximation via second order system. The controller is designed using the structured s...
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ISBN:
(纸本)9781479909964
The paper deals with the robust control of air-flow in air heating set. The identification is performed using step responses and approximation via second order system. The controller is designed using the structured singular value (SSV or μ) and algebraic approach. Since the cost function is nonconvex the optimization cannot be done using standard tools. Hence an evolutionary algorithm - Differential Migration (DM) is employed yielding good results in this case. The functionality of the controller is verified through experiments on the real plant.
The paper deals with the robust control of airflow in air heating set. The identification is performed using step responses and approximation via second order system. The controller is designed using the structured si...
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A basic control course is taught for electrical engineering students at the University of Debrecen, Hungary. Through two semesters the students get a basic knowledge on control concepts. Every week there are 2 hours o...
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A basic control course is taught for electrical engineering students at the University of Debrecen, Hungary. Through two semesters the students get a basic knowledge on control concepts. Every week there are 2 hours of theoretical lectures immediately followed by 2 hours of MATLAB based interactive computer laboratories. In the curriculum besides the conventional material new aspects of control design such as Youla parametrization have also been included. Practical considerations as e.g. controller saturation are also dealt with. The paper reviews briefly the curriculum and the educational process of this program.
In this paper, a fractional order PD μ controller based on visual features is presented. A manipulator robot with 6 degrees of freedom and an eye-in-hand camera configuration is employed to design a visual servoing ...
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ISBN:
(纸本)9781479901890
In this paper, a fractional order PD μ controller based on visual features is presented. A manipulator robot with 6 degrees of freedom and an eye-in-hand camera configuration is employed to design a visual servoing control architecture. The image based control law was designed using point features. A Matlab simulator which implements the visual control architecture was developed and the results were compared with a classical integer order controller. The validity of the visual based controllers is shown by the simulation results which demonstrate that the proposed approach based on a fractional order controller has a stable and convergent behavior when dealing with visual servoing applications. The fractional order PD μ controller provides better performances in comparison with an integer order PD controller.
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