The paper is focused on AC railway traction system 25kV / 50Hz (respectively 60Hz). Currents progress at fields of power electronic allows to use semiconductors converter as a part of traction substations. It brings more advantages for operation modes of TSS (symmetrization, compen...

This paper describes novel method of balancing of multi-level flying capacitor converters. The proposed balancing block is placed behind PWM modulator instead of balancing table and it is independent on type of modulator nor number of levels. The method was simulated in ModelSIM an...

This paper presents a new zero current switching bidirectional DC-DC converter for dual voltage automotive systems. The improved version of hard-switched DC-DC converter with an additional auxiliary resonant network, which is a combination of two auxiliary switches, two resonant inductors and...

Two different approaches for the calculation of the household photovoltaic (PV) installations energy balance are presented and discussed in this paper. The main methodology is based on the Monte Carlo method is proposed and applied to the case study with the effort to increase ...

Main focus of this work is to design a three–phase rectifier based on silicon–carbide power diodes. Main part of the article is dedicated do equations which are then used to obtain temperatures of power diode junction based on current, voltage and switching frequency. From the...

A new universal multi H-bridge converter is introduced in this paper. The main purpose of proposed universal converter is simple testing of modular multilevel topologies as CHB and M2LC topology. The whole converter is designed to fit a standard 2U height 19” rack mount enclos...

Thermal analysis is one of the key aspects of electrical machine design. This paper presents an analysis of lumped parameter thermal model (LPTM) of the electrical machine. The paper shows a comparison of the different sizes of thermal models. Different quantities of the thermal&#x...

The paper is focused on topologies of traction substations for AC railway traction system especially for 25kV, 50Hz (respectively 60Hz). The current progress of power electronic field of study allows to use semiconductor converters as a part of distribution power grid (i.e. for HVD...

Active filters are necessary devices in the infrastructure of power grid. The active filters improve the quality of electrical energy. This paper describes design of control strategy for active filter, which uses three delta connected 5-level CHB converters. The proposed control strategy...

The interturn short-circuit is one of the most often failures of electric motors which can lead to serious consequences with the irreversible damage of the whole drive. The detection of these short-circuits is a challenging task depending also on the parameters of the winding ...

The most common control algorithms for PMSM are based on simplified interpretation of the mathematical model, assuming strictly harmonic signals and linear distribution of the magnetic flux of permanent magnets in the air gap. Nevertheless neglected phenomenons in the mathematical mode leads...

The calculation of the winding's series resistance is complicated, especially when high frequency and geometrical effects like the skin-, the proximity, or the current-loop effect can affect the electromagnetic field inside the wire. Finite element analysis (FEA) can calculate any electromagn...

In a real-time control systems, reliability plays a key role. This topic is closely related to a control algorithm design as well as its effective implementation. The In the Loop testings such as Model In the Loop (MIL), Software In the Loop (SIL), Processor In the L...

The Thermal overstress behavior of power semiconductor components is a determining factor to evaluate the reliability and performance of power electronic devices. Many theoretical and empirical methods have been presented to address the thermal effects of power electronics components on the ...

Power semiconductor installations in mediumvoltage power grids are usually built by numerous particular power converter units containing large number of power modules. Such large installations place high demands on control systems including precise timing and signal distribution across the whole ...

This paper deals with study of operating states for AC traction substation. The selected topology of traction substation is described in paper. The topology suitability is discussed with the respect to industrial component parameters (25kV / 50 Hz, substation power 12.5MVA, 3 kV&#x...

The descriptions and simulations of different differential order synchronous machine models are analyzed in this paper. Focus is paid on the Power System Analyses Toolbox models in the Simulink environment (MATLAB). The response of the models on the three-phase short circuit fault is&#x...

This paper is focused on the transient thermal model of the Permanent Magnet Synchronous Motor (PMSM) and the airflow cooling model through the ribs in the stator lamination. The stator lamination has a new specialized designed shape. This type of lamination does not need a&#x...

Single-phase ground faults are the most common faults in medium-voltage distribution grids. High-impedance grid grounding using a special four-leg transformer is discussed in the paper. The transformer’s zero-sequence impedance differs from positive-sequence impedance&#x...

The paper describes the symmetrization method of power converter used in topology of AC traction substation with power balancer. This topology provides the three-phase current symmetrization and the reactive power compensation for AC traction substation fe...