This work is devoted to the development of an algorithm for controlling transistors in a three-phase multilevel conversion system. The developed algorithm allows to organize a correct operation and describes the state of transistors at each moment of time when constructing a computer model of a three-phase multilevel converter. The developed algorithm of operation of transistors provides in-phase of a three-phase converter and obtaining a sinusoidal voltage curve at the converter output.
This article considers the design of circuits of multilevel inverter on IGBT transistors with pulse-amplitude control. The output of multilevel inverter on IGBT transistors can produce voltage, which is close to the sinusoidal form. The main task of this multilevel inverter is the conversion of solar energy into electric power of industrial frequency. There has been carried out the analysis of the obtained output curves of the voltage for sinusoidal behavior. This scientific article describes the developed scheme of the multilevel inverter, which allows to obtain at the output the voltage, close to the sinusoidal voltage, and also the regulation of level of the output voltage. In multilevel inverters on IGBT transistors with pulse-amplitude modulation, the formation of the multilevel voltage, approximating a sinusoid, is realized by summing the voltages of power supplies. The best option is considered when the multilevel voltage is applied to the input of the inverter and the sinusoidal voltage is formed at the output of the inverter.
In this work we consider the developed scheme of multi-level invertor, which is collected on
IGBT transistors. Transistor switching, which provides harmonicity of output tension, is calculated on each level. For
verification the settlement data, the imitating model of multilevel inverter was constructed in MatLab program. The
output curve tension received at the exit of multilevel inverter’s imitating model was spread out to harmonious
components. It allowed investigating most precisely harmonious structure of the received multi-level inverter’s tension
curve. For ensuring output tension with a sinusoidal curve, researches and calculations of a corner of switching for each
source of the multi-level inverter are conducted. Calculation of switching corner for each source for eight, twelve and
twenty-six step single-phase inverters is carried out. For each step the necessary level of tension is provided, it carries
out the harmonicity the whole inverter’s output tension. Calculations were carried out in algorithm presented below, in
this case for eight, twelve, and twenty-six step inverters.
The given paper considers the multilevel 6 kW-power transistor inverter at supply by 12
accumulators for transformation of solar battery energy to the electric power. At the output of the multilevel
transistor inverter, it is possible to receive voltage close to a sinusoidal form. The main objective of this
inverter is transformation of solar energy to the electric power of industrial frequency. The analysis of the
received output curves of voltage on harmonicity has been carried out.
In this paper it is set forth the developed scheme of the multilevel transistor inverter (DC-to-ac
converter) which allows receiving at the output the voltage close to sinusoidal form, as well as to regulation
of the output voltage level.
In the paper, the results of computer modeling and experimental studies are presented.
The paper investigated the possibility of measuring the resistive physical quantity generator using deterministic chaos based RL-diode circuit. A generalized structure of the measuring device using a deterministic chaos signal generator. To separate the useful component of the measurement signal of amplitude detector is proposed to use. Mathematical modeling of the RL-diode circuit, which showed a significant effect of the barrier and diffusion capacity of the diode on the occurrence of deterministic chaotic oscillations in this circuit. It is shown that this type deterministic chaos signal generator has a high sensitivity to a change in output voltage resistance in the range of 250 Ohms, which can be used to create the measuring devices based on it.
This article considers multilevel transistor inverter for converting energy of solar panels into electroenergy. The output of multilevel transistor inverter produces the voltage of almost sinusoidal form. The primary objective of this inverter is to transform solar energy into electroenergy of industrial frequency. The analysis of received output curves of voltage for sinusoidality has been conducted.
The system "solar panels-commutator-inverter-load" with amplitude-impulse control was researched. It was shown that if the solar panels are located in a certain way at the input of the inverter, it will be possible to get multilevel voltage close to sine wave with the help of amplitude-impulse control of commutator at the output of inverter. Herewith the effect is saving of solar panels depending on the quantity of voltage level, and also the enhanced voltage distortion coefficient (THD). For instance, with 8-level of voltage 28,2% and THD=4,64%, with 13-level of voltage, 30,5% and THD=2,65%, and with 26-level of voltage 31,7% and THD=1,22%. The given results were obtained through computer modeling and experimental research.