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Inverter 12V DC/230V AC
Stejskal, Jiří ; Huták, Petr (referee) ; Klíma, Bohumil (advisor)
This diploma thesis describes particular parts of power inverter such as gate driver, DSC, LC filter, low power supply, DC/DC converter and four-quadrant bridge and manner of its control by digital signal controller. Inverter is designated for generating of a mobile artificial electric grid (for example in a car).
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Control of Three-phase Sinusoidal Power Source
Žůrek, Tomáš ; Patočka, Miroslav (referee) ; Klíma, Bohumil (advisor)
This thesis deals with control of three phase inverter as three phase sinusoidal voltage source for UPS application. Thesis is split to two parts, teoretical and practical. Teoretical part deals with three phase inverter topology analysis according requirement of neutral line wire and possibilities of generating sinusoidal PWM in depend of topology. There are also analysed properties of contorled system and designed 3 regulation methods with simulations. Second part of thesis deals with realisation of sinusoidal power source with inverter borrowed by Elcom company. To inverter control is used digital signal controler TMS320F28335 with implemented control algorithms. There are also presented the measurement results of the prototype of power source. In conclusion, simulation results are compared with measurements and achieved results are summarized.
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Control of three-phase asynchronous motor
Nekvapil, Jan ; Huták, Petr (referee) ; Klíma, Bohumil (advisor)
This theses concern proposal and implementation asynchronous motor control algorithm in the processor DSP56F807 from the manufacturer Freescale. The complex design of applicable control algorithm and suitable interconnection with processor and outer component is solved in this work. Integral part is also choosing of suitable power elements of inverter and sensors.
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Inverters for lighting units with LEDs
Zuber, Zalán ; Feiler, Zdeněk (referee) ; Klíma, Bohumil (advisor)
The master‘s thesis deals with DC/DC converters for power LED diodes. Gives an overview of the field of LED lighting technology, analyzes various types of converters and shows their principle of operation. Furthermore presents some possible circuit designs for three different voltage levels and the calculations for each part. As an approval of their functionality the results of their measurements are plotted followed by the data evaluation.
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Drive design for Foil Winding Machine
Koncer, Adam ; Červinka, Dalibor (referee) ; Klíma, Bohumil (advisor)
Master’s thesis deals with the realization of motion drives for the foil winding machine. Drives for this machine are supplied by company Siemens. Whole project is made in cooperation with that company. The reader gets a comprehensive overview of the product group SINAMICS that will be used for the realization of drives in this machine. Thesis describes the selection of individual drive components, their control and regulation. Measurement and evaluation of results foil winding machine is made in the last chapter of this thesis.
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Model of electric vehicle in SIMULINK/SIMSCAPE program
Kachlík, Jan ; Klíma, Bohumil (referee) ; Huzlík, Rostislav (advisor)
The topic of this diploma thesis is mathematical model of electric vehicle. The traction drive consists of Li-Ion battery, free-phase DC/AC converter and permanent magnet synchronous machine. The main goal of the thesis is development of function model and making simulations in SIMULINK/SIMSCAPE program. Work is divided into three main parts. The first part is dedicated to the theoretical description of the main drive components. The second part describes partial subsystems of the model. In the last part is build a complete model of electric vehicle and simulated different driving mode.
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Design of the electric locomotive drive
Dočekal, Martin ; Klíma, Bohumil (referee) ; Patočka, Miroslav (advisor)
The focus of the work is the calculation and design of battery-powered drive of locomotive, operating in the sub-siding mode, ie when the locomotive is moving on the track section without the overhead line. The proposed battery groups to ensure the drive train will be installed directly into the locomotive engine room. In the theoretical part of the work there has been done the analysis of the electrical locomotives and electrical unit, which nowadays are used in the Czech Republic in driving of voltage controller with the integrated circuit. Then, in the chapter there is a brief description modern locomotives frequency convertor’s and rectifier’s function. The practical part of the work contains the necessary force and energy calculation for train moving on the determined rails. On the base of the received data, the design of battery groups has been done. These battery groups will work as an independent traction which insures the moving of the train on the determined rails. In the work the design, which consists of STEP-UP and STEP-DOWN convertors, has also been done. The power model and model management were created in Matlab Simulink programme. Data and graphs exported from the Matlab Simulink programm are determined for verifying convertor’s function, which can be found in a separate chapter. In addition to the proposal of the battery drive is at work also has been calculated loss of traction rectifier during normal operation of the locomotive, ie outside siding mode. For this calculation, in the conclusion is listed the theory of calculation of the losses incipient in the transistor and freewheeling diode of rectifier. According to the theory own calculation is performed. Subsequently the liquid cooler calculation of the rectifier is calculated.
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Asynchronous dynamometer - power inverter
Vetiška, Vojtěch ; Červinka, Dalibor (referee) ; Klíma, Bohumil (advisor)
This project deals with the power converter for the asynchronous dynamometer. Inside of the document we shall acquaint with claims towards switching transistors and actuators. Furthermore we shall go through the principle and the wiring of three-phase converters and active rectifiers . We specify particular conditions of parameters for the power converter. For these conditions we shall dimension particular elements of the power converter. On the end we shall design the mechanical arrangement of the power circuit and create the design documentation..
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Power Inverter Online Diagnostics
Knobloch, Jan ; Chlebiš,, Petr (referee) ; Drábek,, Pavel (referee) ; Klíma, Bohumil (advisor)
This doctoral thesis focuses on the problems of IGBT failure prediction in pulse converters using measurable changes of selected parameters (so--called trending variables) being influenced of transistor degradation during aging. Firstly the state--of--the--art in this field is presented in the dizertation. The description of designed and constructed automated measurement stand follows, enabling monitoring and recording of switching processes during accelerated aging. Further the problems of high--bandwidth measurement of electrical quantities during IGBT switching are described. Especially the problems of current sensing are analyzed and the most suitable sensor is selected. The data recorded using the developed apparatus served to identify potential trending variables allowing the failure prediction. Here the dependence of trending variables on aging and on parasitic influences (current, temperature, voltage) had to be distinguished. Finally the evaluation of trending variables is performed. Their insignificant sensitivity on accelerated aging is shown which complicates their practical implementation for the purpose of failure prediction.
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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.
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