Hybrid power supply systems in the recent time are used in everyday life, primarily because humanity turns in exploitation of renewable energy sources, as well as the reduction of fossil fuel reserves, where most of the electricity produced is based. The hybrid power supply system in its most general form includes the following components: photovoltaic systems, wind generator, diesel generator, a system for energy storage (batteries), grid connection, and power converters through which is perform the conversion of electrical energy and power suppling. This paper will provide an analysis of the operation and viability of a hybrid power supply system, modeled in software package HOMER.

In this paper is presented realization of integral environment which consists of software and hardware components for the purpose of programming Altera DE boards. Software component is Toolbox FPGA Real Time which enables simple use of Matlab/Simulink with DSP Builder for the purpose of realization of control structures. Hardware component are Interface cards that make connection of DE board with object of control possible. Simulation and experimental results of DC motor control indicate the usefulness of the proposed concept.

Proper work of grid-connected converters requires an accurate detection of phase angle, frequency and amplitude of grid voltage. Phase locked loops (PLLs) based on synchronous reference frame theory can be used for estimation of these grid parameters. One of the issues that could appear during estimation of grid parameters is appearance of DC offset in measured grid voltage. This DC component (offset) is usually entered in PLL structure via measurement and A/D conversion process. Undesirable induced DC offset could appear as part of the reference sine current of photovoltaic inverters or other grid-connected converters. A lot of standards define allowed PV inverter's DC current injection in the grid. In this study, we propose an improved PLL structure with capability to fully reject DC offset and noise which could appear in measured input grid voltage. The key component of the proposed PLL is two-phase generator with a closed control loop for DC offset and noise rejection. Obtained simulation and experimental results show that the proposed PLL structure can solve important issues of presence of noise and DC offset in measured grid voltage. The proposed PLL structure shows excellent dynamical performances in conditions of fast changes of grid parameters.

Abstract In this paper is presented architecture of the controller for controlling the base configuration of PUMA 560 robot (three axes). Developed controller (designated for student education) has hardware part based on Altera Cyclon II FPGA chip implemented on DE2 development board and software part MATLAB® with corresponding toolboxes. Matlab with installed Robotics Toolbox was used for the purposes such as generating trajectory of movement, calculating inverse kinematics, gravity compensation and simulation of manipulator movements. The control structures were which have been previously devised in Matlab/DSP Builder using FPGA Real Time Toolbox were implemented on FPGA chip. Performed experimental results showed that proposed concept of the controller design satisfied appointed requirements such as easy simulation, programming and testing controller performances, so the next objective of research will be design of the improved control algorithms of robot and design of new Teachbox.

In this paper are presented our research results about possibility of use different types over-voltage protection circuits in push-pull inverters. We first analyzed the conventional passive type RC and RCD over-voltage protection circuits and gave experimental results. After that we analyzed active overvoltage protection circuit, made design of protection circuit components and provided experimental results. Final investigation has shown that active over-voltage protection is better solution than passive protection circuits with respect to efficiency and reliability.

Power TransformersInductors and Transformers for Power ElectronicsTransformer and Inductor Design Handbook, Third EditionTransformer Design Principles With Applications 3eModern Power Transformer PracticeEngineering ElectrodynamicsTransformer and Inductor Design HandbookPower Electronics DesignHandbook of Transformer Design and ApplicationsTransformer EngineeringFundamentals of Power ElectronicsTransformers for Tube Amplifiers: How to Design, Construct & Use Power, Output & Interstage Transformers and Chokes in Audiophile and Guitar Tube AmplTransformer and Inductor Design HandbookTransformer EngineeringTransformersPower Magnetic DevicesPractical Oscillator HandbookPractical Transformer Design HandbookComputer-Aided Analysis and Design of Switch-Mode Power SuppliesSwitched-mode Power Supply Transformer Design Nomograms. Philips' Gloeilampenfabrieken, Electronic Components and Materials DivisionMagnetic Components for Power ElectronicsPower Transformer Design PracticesDesign of TransformersEnergy Production Systems EngineeringSwitching Power Supply Design, 3rd Ed.High-Frequency Magnetic ComponentsTransformers and Inductors for Power ElectronicsMagnetic ComponentsPower Transformer Diagnostics, Monitoring and Design FeaturesTransformer Design PrinciplesPractical Transformer DesignTransformer Design PrinciplesSwitching Power Supply DesignSpotlight on Modern Transformer DesignTransformer EngineeringThe J & P Transformer BookPower and Distribution TransformersTransformersFundamentals of Electrical Design Module 4 Understanding Transformers Power Distribution and UtilizationDesign Aspects of Power Transformers

In this paper we described realization of digital assembly for processing of output signal from incremental encoder on FPGA platform in Matlab/DSP Builder. For the purpose of realization of the design and programming of FPGA circuit on development board DE2 we used Matlab/DSP Builder. Encoder functioning principle, accepting, processing and counting of impulses and acquiring velocity information through differentiating measured position are all described in detail. Functionality of realized design was verified through simulation in Matlab/DSP Builder and velocity (acquired through differentiating of measured position) was provided in experimental result (comparison of motor rotation speed acquired from encoder and tachogenerator). Experimental result confirms that chosen concept of encoder signal processing was correct.

In paper is presented HDL Code generation of Cordic Algorithm in MATLAB/Simulink, using HDL Code generation tool, and its implementation on FPGA Altera Cyclone, using Altera Quartus II. There are also tested data types which Cordic uses, as well as time which is need for sine or cosine calculation of given angle, depending on these data types. With this information Cordic can be easily implemented in any digital system.

For proper work of grid-connected converters it is important to have accurate detection of phase angle, frequency and amplitude of grid voltage. Estimation of these grid parameters can be achieved using PLL (phase locked loop) based on SRF (synchronous reference frame) theory. This PLL should have robustness against noise and offset introduced by measurement and data conversion. This paper proposes an improved PLL algorithm that has excellent noise and offset rejection property. The main part of proposed PLL is a novel two-phase generator which is used to obtain two quadrature signals for SRF block and PI regulator in closed control loop. Performances of proposed PLL are verified through experimental results given in this paper.

This paper deals with closed control loop implementation for robot single axis with DC motor on FPGA platform. Controlling algorithm is designed in Matlab/Simulink environment and its Custom Toolbox is specifically designed for the purpose of control structures development in real time. Torque is calculated on FPGA structure and brought to a motor which generates necessary PMW. On the motor axis is a pendulum which follows default trajectory. It is a stream of data obtained by calculating or recording robot axis position while moving it manually. Experimental results are also provided.

It is very important for proper work of grid-connected converters to have accurate detection of phase angle, frequency and amplitude of grid voltage. Estimation of these grid parameters can be achieved using PLL (phase locked loop) based on SRF (synchronous reference frame) theory. This PLL should have robustness against noise and offset introduced by measurement and data conversion. This paper proposes an improved PLL alorithm that has excellent noise and offset rejection property. The main part of the proposed PLL is a novel two-phase generator which is used to obtain two quadrature signals for SRF block and PI regulator in closed control loop.