National Repository of Grey Literature 37 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
NMPC Application for PMSM Drive Control
Kozubík, Michal ; Blaha, Petr (referee) ; Václavek, Pavel (advisor)
This thesis focuses on the possibilities of application of nonlinear model predictive control for electric drives. Specifically, for drives with a permanent magnet synchronous motor. The thesis briefly describes the properties of this type of drive and presents its mathematical model. After that, a nonlinear model of predictive control and methods of nonlinear optimization, which form the basis for the controller output calculation, are described. As it is used in the proposed algorithm, the Active set method is described in more detail. The thesis also includes simulation experiments focusing on the choice of the objective function on the ability to control the drive. The same effect is examined for the different choices of the length of the prediction horizon. The end of the thesis is dedicated to the comparison between the proposed algorithm and commonly used field oriented control. The computational demands of the proposed algorithm are also measured and compared to the used sampling time.
Novel Methods of Sensorless Control of Drives with PMSM Motor
Lepka, Jaroslav ; Klíma, Bohumil (referee) ; Lettl,, Jiří (referee) ; Václavek, Pavel (advisor)
Purpose of this dissertation is to explore control techniques of PMSM motors and the design of a complex solution of sensorless control across a wide range of speed and torque. The proposed solution supports industrial implementation of different types of end equipment which use a PMSM motor. The work covers a thorough analysis of position and speed estimation. The Control structure is based on field oriented control technique, processes estimated quantities, and optimizes motor conditions to achieve maximum efficiency, start-up torque, and speed. The work discusses how the solution complies with the latest IEC standards. Compliance with these standards requires adapting the sensorless control technique and field oriented control structure. The elimination of a rotor position sensor and a temperature sensor measuring winding temperature requires development of techniques in software for blocked rotor detection and overload detection. The proposed solutions, which have been granted US patents, are explained in this work and utilize the unique features of an NXP microcontroller optimized for motor control applications. The achieved results are demonstrated on real industrial applications.
Anti-windup Schemes for Linear Dynamical Systems Control
Kozubík, Michal ; Pohl, Lukáš (referee) ; Václavek, Pavel (advisor)
The aim of this bachelor thesis is to study windup effect and methods of its compensation. Introduced methods are clamping, back-calculation, internal model control (IMC) and design based on solution of linear matrix inequalities (LMI). The Matlab tool was created for the last two methods. All mentioned methods were then tested on chosen systems by simulaton in Matlab Simulink. After that results of simulation were evaluated with respect to computational time, overshoot, settling time and ITAE criterion.
Optimization in control systems
Daniel, Martin ; Václavek, Pavel (referee) ; Pohl, Lukáš (advisor)
Master’s thesis deals with using a linear matrix inequality (LMI) in control of a dynamic systems. We can define a stability of a dynamic system with a LMI. We can use a LMI for research if the poles of a system are in a given regions in the left half-plane of the complex plane with a LMI or we can use a LMI for a state feedback control. In the work we describe a desing of a controller minimizing a norm from an input to an output of the system. There is also a desing of a LQ controller with a LMI. In the end of the work, there are two examples of a design a LQ controller, which minimize the norm from the input to the output of the system and moves a poles of a dynamic system in a given regions in the complex plane, with the LMI. We use a LMI for a design a continuos LQ controller in the first example. In the second example we use a LMI for a design a discrete LQ controller.
Alternative control SW for dedicated thermal performance chambers with customized UI
Žlebek, Jan ; Veselý, Libor (referee) ; Václavek, Pavel (advisor)
This thesis is oriented on simulating thermal chambers, their SW and HW and improving SW to meet specifications. Testing problematics connected with this thesis is briefly mentioned also. Thermal chambers used here are dedicated to run simulating test procedures for thermostats and similar devices designed to sense temperature and regulate it. Design and realisation of new SW are clarified in latter chapters of this thesis, as well as evaluating functionality and resulting dynamics and accuracy.
PMSM Modeling in Non-standard Situations
Daniel, Martin ; Otava, Lukáš (referee) ; Václavek, Pavel (advisor)
There is an increasing use of synchronous motors with permanent magnets in industrial applications. Therefore, it is also required simulation of the behavior of these engines in non-standard situation. We want to prevent destruction of the engine thanks to these simulations. Waveforms of signals are the result of the simulation. The bachelor thesis deals with a design of simulation schemes. Specifically, is about the short circuit phases at the input of the engine, disconnect engine from the source and change duty cycle of inverter. One part of the thesis belongs to a creation of user interface for setting the technical parameters of the engine and an activation of simulations with using the created simulation schemes.
AC Drives Modeling in Modelica
Lalović, Goran ; Otava, Lukáš (referee) ; Václavek, Pavel (advisor)
Tato závěrečná bakalářská práce se zabývá s postupy fyzikálního modelování a simulaci střídavých pohonů v jazyce Modelica a prostředí OpenModelica. Za prvé, zde se nachází přehled všeobecných vlastností modelů pro základní typy střídavých pohonů, asynchronní a synchronní stroje a příslušných regulačních struktur v prostředí OpenModelica. Poté se bakalářská práce zaměřuje na srovnání chování vytvořených modelů s dostupnými modely v prostředí Matlab-Simulink. Cílem bakalářské práce bylo vyexportovat FMU, přeložit, odsimulovat a prácovat s modely z prostředí OpenModelica do Matlab-Simulink. Teoretický popis základních typů střídavých pohonů se nachází na prvních dvou kapitolách. Ve třetí kapitole se bakalářská práce zabývá srovnáváním modelů vytvořených v OpenModelica a Matlab-Simulink, a porovnává výsledky simulace. Na konci, jsou uvedeny základní informace o standardu FMI, FMU a mluví se o překadu modely z prostřdí OpenModelica, pomocí JModelica-y do Matlab-Simulink-u.
Losses Minimizing Control of AC Drives
Džama, Igor ; Otava, Lukáš (referee) ; Václavek, Pavel (advisor)
This semestral thesis deals with issues of controll of alternating current drives of reluctance-synchronous type with interest on energy efficient controll. Thist hesis contains description of permanet magnet synchronous machine with reluctance moment and vector controll. On the model of the motor are than designed algorims tried. Algoritms are than between each other and algorithm of of controll of synchronous machine withount reluctance moment compared.
Room Temperature Advanced Control Algorithms
Glos, Jan ; Graf, Miroslav (referee) ; Václavek, Pavel (advisor)
This bachelor's thesis deals with constructing a thermal model of the specific room and algorithms design for heating and air conditioning. The model is created using Simscape extension for Matlab/Simulink and is based on real attributes of room and its walls (materials, dimensions etc.). This thesis contains design of MPC (Model Predictive Control) and PI controllers. In comparison with the original regulation designed controllers achieve better quality of control and MPC controllers seems to be the best. Because of preliminary for integration of split air conditioner, possibility of control actuators by MPC controller and because of necessary setpoint separation (for heating and air conditioning) software equipment of the individual zone controller was revised.
AC Induction Machine Field Weakening Algorithms
Mynář, Zbyněk ; Veselý, Libor (referee) ; Václavek, Pavel (advisor)
Nowadays, thanks to advances in information and power technology induction motors are deployed there, where previously only other types of electric motors were possible to use. Those typically lack the reliability and low cost of induction motors. Best results in control of induction motors are achieved when vector control is used, to which part of the work is paid. If induction motor reaches the speed when it is no longer possible to continue to increase stator voltage, there is possibility of field weakening or reduction of magnetic flux and thus achieve higher speed. A comparison of several algorithms is devoted to this work. As a simulation tool MATLAB-Simulink was used. Another part is devoted to implementation of these algorithms to the processor of 56F800E series which uses calculations in fixed point.

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See also: similar author names
1 Václavek, Patrik
3 Václavek, Petr
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