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This paper joins the developing trend of modeling distributed generators based on dq0 quantities, and proposes an open-source software for modeling and analysis of large-scale power networks based on dq0 signals. The dynamic models describing the network are provided as state-space objects that are sparse and of minimal order. The software supports integration of various models of synchronous machines,...
In complex systems, such as military organizations, a large number of technical resources requiring regular maintenance is used. These resources are often exposed to difficult working conditions increasing the probability of a fault occurrence. Fault diagnosis as a part of the maintenance process is often a complex process, which is why expert systems for fault diagnosis are developed. One of the...
For pursuing the high speed information transmission, the design and research of the high speed SerDes circuit are actively developing now. Due to the requirements for long transmission path, intensive equalization and high speed transmission circuit testing function, two high speed SerDes circuits are designed and fabricated based on 130nm SiGe BiCMOS technology. One is for the research of the equalization...
This paper deals with the design and test of a Reluctance based Magnetic Lead Screw Power Take Off (PTO) system for a Wave Energy Converter for powering a LED light buoy. In order to meet the power requirement for the LED marking light, measurements of the seastate at the specific location of the buoy is carried out using a special wave measurement buoy. The data is used to set up a simulation model...
Experiments with a simple plane wave generator consisting of two cylindrical explosive charges and a metal ring are presented in this work. Detonation front curvature emerging from the second charge is measured using high-speed camera and Optimex fiber based device. The results are compared with LS-DYNA simulations.
The purpose of this paper is the simulation development of A5/3 algorithms used by GSM networks security, one of the elements of the GSM networks security is A5/3 algorithm. the simulation facilities of the MATLAB, specifically by the used SIMULINK environment. According to knowledge, this is the first time to develop a SIMULINK approach for realization the proposed developments of A5/3, and testing...
It is possible to carry out activities related to load profiling, energy consumption estimation, planning, taking new investment decisions, managing voltage and energy quality, system efficiency and loss of line with the evaluation of collected data from smart grid. Therefore, it is important to analyze and forecast the smart grid. Energy efficiency in fast-growing countries like Turkey is an important...
this paper presents results on the simulation, modeling and optimization of an off grid hybrid solar PV/diesel/battery/inverter power system for residential application. The principal objective is to design a standalone renewable energy system to meet the desired electric load with high renewable fraction, low excess power and low cost of energy. Hourly simulations and optimization were performed...
Splitting the real time image of size P x Q into four enlarged image blocks without zooming. Each splitted image blocks are interpolated to the dimension of the original image without blurring and display image in four different screens. The design is implemented using the simulink, system generator module and finally on the FPGA. In this paper, techniques for splitting and enlarging an image are...
As more renewable energy resources connected by power electronics and gas-fueled generators are integrated into power grids, total system inertia has been significantly decreasing in recent years. The resulting decline in system primary frequency response threatens the reliability and stability of power grids. This paper aims to study the locational dependence of the impacts of inertia on system primary...
In this paper, a three-stage generator model is established based on Modelica/Dymola. Start from the mathematical model of the generator, the main generator (MG) and the main exciter (ME) are remodeled by using the Modelica language. Then, the generator control unit (GCU), the pre-exciter (PE) and the rotating rectifier model are built using components in standard library of Dymola. And Dymola is...
In this paper, a planar metasurface operating in microwave region to generate Bessel beam carrying orbital angular momentum (OAM) is proposed. The beam generator is realized by utilizing the abrupt phase changes at the interface of the metasurface, instead of the gradual phase differences in the optical lenses. The proposed planar metasurfaces are designed and simulated respectively, and the results...
As in most of the renewable energy sources it is not possible to generate high voltage directly, the study of high gain dc-dc converters is an emerging area of research. This paper presents a high step-up dc-dc converter based on current-fed Cockcroft-Walton multiplier. This converter not only steps up the voltage gain but also eliminates the use of high frequency transformer which adds to cost and...
Switch mode power supplies generated a wide range of conductive and inductive interference. Moreover, the spectrum dominated by discrete components with a switching frequency of a power transistor and its harmonics. To ensure the electromagnetic compatibility of devices necessary to reduce the amplitude of these spectral components. In this paper the questions of usage of spread spectrum technology...
Based on the analysis of the turbine generator system, steam turbine and its speed governor system, synchronous generator and its excitation controller and load model of turbine generator system are modeled mathematically. Then, the model of turbine generator system is simulated in Matlab/Simulink, the model of turbine generator system can conclude characteristics curves that are similar with actual...
This paper is focused on the improvement of the grid current at the point of common coupling of a three-phase grid connected photovoltaic system supplying a non-linear load. This improvement is achieved by using the PV inverter as a shunt active power filter in addition to its main function of power injection in the grid. The shunt active power filtering is performed to compensate the disturbing grid...
In this paper, a DC-DC buck converter using a multi-bit (two-bits) delta-sigma modulator to control segmented output switches of the converter is proposed to enhance its efficiency and improve its output ripple. This converter operates in continuous condition mode (CCM). Here, the two output bits of the modulator control the switching of the main and the supplementary switches. The circuit is simulated...
This paper studies how to determine an optimal order of recovering interdependent Cyber Physical Systems (CPS) after a large scale failure. In such a CPS, some failed devices must be repaired first before others can. In addition, such failed devices require a certain amount of repair resources and may take multiple stages to repair. We consider two scenarios: 1) reserved model where all the required...
In this paper is presented an algorithm for estimating the wind speed by solving the non-linear model of a wind turbine (WT) using the Newton Raphson iterative method. The wind speed estimations obtained are used for computing the WT generator speed that maximize the extraction of wind power. This optimum generator speed is used as reference for the speed controller of a permanent magnet synchronous...
In this paper, a new single-phase multilevel inverter topology suited for distributed DC sources is proposed. The proposed inverter is comprised of a voltage-level generator connected in series to the input of the classical H-bridge. The voltage-level generator is only able to generate positive DC voltage levels at its output. The H-bridge is used to generate the negative and zero voltage levels....
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