ANALYSIS OF INDICES OF ENERGY EFFICIENCY OF AUTONOMOUS VOLTAGE INVERTERS WITH VARIOUS MODULATION TYPES
Journal Title: Збірник наукових праць Українського державного університету залізничного транспорту - Year 2018, Vol 180, Issue 14
Abstract
In the article an analysis of energy characteristics and indices of electromagnetic compatibility of autonomous inverters of voltage with different types of modulation is given. Modes of single modulation with 120-, 150- and 180-degree control, one-way and two-way pulse-width modulation, as well as re-modulation mode are considered. The comparative analysis of the implemented parameters of the incoming current pulsation, sinusoidality of the output current, and the values of static and dynamic losses in power switches is presented. The data is obtained through simulation simulation, as well as calculation in the specialized program of MelcoSim from the company Mitsubishi. The obtained analytical expressions allow to determine the values of the amplitudes of higher harmonics in the forms of the output voltage and the output current of the autonomous voltage inverter under different algorithms of single modulation. It is established that the classical diagrams of the output voltage of the autonomous inverter voltage at 120- and 180-degree control are valid only for the resistive load and in the case of an RL load will have a distorted form. The dependencies of the output current THD, the THD of the output voltage, as well as the amplitude of the first harmonic of the output voltage on the value of the modulation coefficient are established. With the growth of the re-modulation coefficient, the amplitude of the output voltage increases, but with this there is an increase in the content of higher harmonics with frequencies lower than the frequency of pulse-width modulation. From the considered modulation algorithms in the autonomous voltage inverter, the smallest losses in the keys and the highest output power causes the mode of 180-degree control, and the best quality of the output voltage and current causes the mode of 150-degree control.
Authors and Affiliations
Volodymyr Nerubatskyi, Alexandr Plakhtiy, Vitaliy Kavun, Artem Mashura, Denys Hordiienko, Vladislav Tsybulnyk
Keywords
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