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Active neutral point clamped (ANPC) converter was developed in order to improve the performances of the neutral point clamped (NPC) converter in terms of the semiconductor loss distribution. Loss distribution depends primarily on modulation type used for generation of the switching signals, therefore it is important to find the appropriate modulation type that will allow the most uniform loss distribution...
Pulse width modulation is a widely used technique for both DC to DC and DC to AC voltage conversion, with most modern-day DC and AC drives control systems exploiting this method. This paper presents a simple and versatile time domain method to determine the spectrum of a pulse width modulated converter output voltage for an arbitrary modulation signal waveform, an arbitrary number of output voltage...
Photovoltaic modules as direct converters of solar energy into electrical energy are typically connected to the power grid trough standard two level converters. A photovoltaics system can be connected to the power grid if it can satisfy the IEEE standardized conditions set by the power grid operator. The conditions include limitations of THD factor and current harmonics. Multilevel converters which...
This paper presents the results of a study of the effect of dead time and finite semiconductor device voltage drops on the output voltage of three-level neutral point clamped power converters. Results showed that finite voltage drops and dead time caused a DC voltage shift, and lowered the base harmonic amplitude of output voltage. These effects were analysed and the results confirmed via simulation...
The development of production and increasing usage of light electric vehicles such as electric bicycles and electric scooters entails development of batteries, battery chargers and fast charging algorithms. Batteries with different nominal electrical characteristics and production technologies are currently in use. Among them, lithium-iron batteries are increasingly being used. The differences in...
This paper describes the educational method for selection of semiconductor switches based on the results of simulated behaviour of the converter circuit with ideal switches. The current-voltage relations on the converter circuit ports and the converter topology determine the requirements for the static and switching characteristics of semiconductor switches. Selection of the switches is illustrated...
The paper presents integrative approach for educational power electronics laboratory, where measurements and simulations are equally used in laboratory exercises. Hardware and software part of laboratory are described, with typical examples deeply explained. The best properties of measurement and simulation are used to reach final goal-better understanding of power electronic circuit behavior. Proper...
Electrothermal models of power semiconductor components are often too complex and requiring a long simulation time. Besides, there can be a situation that electrical and thermal behaviour of the circuit are not analyzed within the same department of a company. This necessitates an appropriate procedure of electrothermal simulation, sufficiently quick, accurate and simple, allowing an efficient exchange...
The paper presents integrative approach for educational power electronics laboratory, where measurements and simulations are equally used in laboratory exercises. Hardware and software part of laboratory are described, with typical examples deeply explained. Te best properties of measurement and simulation are used to reach final goal ?? better understanding of power electronic circuit behavior. Proper...
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