The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents the results from the research of output power control in a bridge converter with IGBT transistors loaded with a serial resonant circuit. The purpose of the research is operation of the bridge converter in mode of induction device. The mode of induction heating of metals have retroactive effect of the parameters of the resonant circuit on the power converter. The change of the parameters...
This work presents an experimental control strategy of stand-alone photovoltaic (PV) system composed of: PV array, DC-DC converters, electrolytic storage and programmable DC electronic load. This control aims to extract maximum power from PV array and manages the power transfer through the DC load, with respect to available storage level. The designed system can supply a DC load at the same time as...
The presented paper deals with control strategy of flying capacitors multilevel inverters. The main issue is the analysis of the permissible switching states, especially the possibility of the multiple commutations.
The performance of the Grid Connected Inverters (GCIs) (like windmill and large central PV converters) is extremely important related to stable and safety operation of a "Smart Grid" SG. These inverters' control features not only cover the renewable energy conversion and active power feeding into the utility grid but furthermore they cover the helping of the grid voltage stabilization, supporting...
In the paper there are presented results of the sensorless control of AC drive with the permanent magnet synchronous motor. The method is based on the rotor magnetic flux components estimation. Practical realization was made by the microcomputer control system with the digital signal processor TMS320F2812. The graphical visualization of the electrical controlled drive was made by the software Lab...
This paper deals with the scalable and transformerless Modular Multilevel Converter (MMC). A new modulation algorithm for this converter is presented, together with a Matlab-Simulink simulation based validation, of eight sub-module single phase MMC. In addition, the capacity of the proposed modulation to operate at high power applications with high number of sub-modules is demonstrated, by means of...
The paper presents investigation, digital control realization and efficiency evaluations of a single-phase grid connected photovoltaic system, composed of DC-DC boost converter and full-bridge inverter with timesharing modulation. The system is analyzed with the use of Matlab-Simulink and FPGA-based real-time models.
This paper presents research motivated by industrial demand for energy storage system for city transport vehicles. The kinetic energy is accumulated into the supercapacitor during vehicle braking. This energy can be used to accelerating again. It is important to save the energy in the vehicles, which accelerate very often.
The natural balancing processes of a 2-cell cascaded active rectifier converter is investigated in the frequency domain. Two balancing mechanisms are identified, weak and strong. Expressions for the time constant of both mechanisms are derived. The limitations and applicability of both mechanisms are discussed. The results are compared to time domain simulation results for the constant duty cycle...
This paper presents a control algorithm for the newly proposed diode-assisted buck-boost voltage-source inverters (VSIs), with high voltage gain, which takes into account the changing of the DC-link voltage (two leveled) during one switching period due to the parallel charging and series discharging of the capacitors in the diode-capacitor network Additionally it lowers the components voltage ratings.
The beginning of modern semiconductor power electronics is connected with invention of Silicon Controlled Rectifier (SCR) in the 1957, wide known as thyristor. It was the base component for power electronics converters during 1960s and early 1970s. What is the situation today? Is thyristor still dominant power electronics component? Is the development of thyristor according to former expectations?...
Natural voltage balancing property is an attractive feature of a flying capacitor converter. In this paper, time domain approach based on stitching piece-wise analytical solutions for consecutive switching intervals is applied to a six-level single-leg flying capacitor converter. The small parameter approximation analysis yields physically meaningful, simple, and accurate expressions for average voltage...
With introduction of recent standards on limiting harmonic pollution of electrical power distribution system, three-phase PWM converters are being considered as prime candidates for interfacing high-power electronic equipment to power supply lines. In these applications, converters can provide input currents without distortion and with unity power factor. In this paper, a unified discrete event model...
This contribution presents results of high frequency measurements on low voltage and medium voltage cables and motors. Bode diagrams and Nyquist diagrams are presented and real parameters are determined. The comparison with calculation results and with data sheet parameters is down.
A full-bridge PWM DC/DC converter with controlled output rectifier is presented in this paper. Soft switching for all power switches is achieved by using controlled output rectifier with new lossless energy recovery turn-off snubber on the secondary side of the converter. No circulating current is occurred in the proposed converter with used new control method. The principle of operation is explained...
Recent concepts of modular multilevel converters (M2LC) require voltage balancing of capacitors and an on-line voltage monitoring circuit connected to Field-Programmable Gate Array (FPGA) board is represented by this article. Recitation of paper includes a schematic of the circuit with characteristics of it and algorithm of program for FPGA board.
Auxiliary power supply systems for rolling stock are less standardized today due to railway specific products with low lot sizes, thus requiring specific system engineering effort and making maintenance and refurbishment difficult. An overview on a standardization initiative is given defining target supply systems for future trains with its essential system interfaces.
In order to maximize the output power from a photovoltaic system, the maximum power point tracking method proposed is an extended version of the algorithm Perturb and Observe (P&O). A PV system based on a DC-DC converter as MPPT device is considered. A programmable DC electronic load is fed by the PV system controlled with P&O, in which incremental steps are different. The experimental results,...
The paper describes a new sliding mode agent-based, decentralized architecture and control for parallel DC-DC converters, supplying low power consumers in the range of 0-250 W. The system provides increased flexibility with autonomic system reconstruction capability in the case of malfunction or fault, significantly increasing the reliability. The distributed intelligence facilitates the optimization...
In this paper, the control of Voltage source converter which consists of six IGBT power switches is realized. Grid connection of VSC is provided through LCL filter and sinusoidal pulse width modulation (SPWM) technique which has 9 kHz switching frequency, is used for switching. Three different way of control including a - b - c, d - q and input - output linearization nonlinear control, are analyzed...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.