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Reduced Components Count with Optimal Switching for Minimum THD in Multilevel Inverter

Zmniejszona liczba komponentów przy optymalnym przełączaniu zapewniającym minimalne THD w falowniku wielopoziomowym

10.15199/48.2024.03.27

nr katalogowy: 147749
10.15199/48.2024.03.27

Streszczenie

This paper presents the design and implementation of a 31 multi-level inverter (31-MLI) suitable for medium and high-power industrial applications. The research considers the reduction of the components in the switches and the DC sources used, as well as the reduction of the total harmonics distortion (THD) at the output voltage by selective harmonics elimination (SHE). For this purpose, three efficient algorithms are used to determine the optimum values of switching angles. Those algorithms are genetic algorithm_(GA), gray wolf optimization _(GWO) and slime mold algorithm_ (SMA). The switching angles that give the lowest value of THD were selected from each algorithm and tabulated for a wide range of modulation index (m), and named the integrated hybrid optimizer (IHO). A reduced switches model of 31-MLI is built, controlled by Arduino, and programmed with the selected optimized angles. A comparison study is carried out for all optimized cases. To validate the effectiveness of the proposed IHO, a 31-MLI is modeled in MATLAB Simulink environment. An experimental prototype was also built and tested. Comprehensive results from both simulation and experiment are analyzed and compared under different operating conditions. The results show the proposed IHO can achieve minimum THD in a 31-MLI.

Abstract

W artykule przedstawiono projekt i realizację wielopoziomowego falownika 31 (31-MLI) odpowiedniego do zastosowań przemysłowych średniej i dużej mocy. Badania uwzględniają redukcję komponentów stosowanych w przełącznikach i źródłach prądu stałego, a także redukcję całkowitego zniekształcenia harmonicznych (THD) napięcia wyjściowego poprzez selektywną eliminację harmonicznych (SHE). W tym celu stosuje się trzy wydajne algorytmy wyznaczające optymalne wartości kątów przełączania. Algorytmy te to algorytm genetyczny_(GA), optymalizacja szarego wilka_(GWO) i algorytm śluzowca_ (SMA). Z każdego algorytmu wybrano kąty przełączania, które dają najniższą wartość THD, zestawiono w tabeli dla szerokiego zakresu współczynnika modulacji (m) i nazwano zintegrowanym optymalizatorem hybrydowym (IHO). Zbudowany jest zredukowany model przełączników 31-MLI, kontrolowany przez Arduino i programowany pod wybranymi zoptymalizowanymi kątami. Dla wszystkich zoptymalizowanych przypadków przeprowadzane jest badanie porównawcze. Aby zweryfikować skuteczność proponowanej IHO, model 31-MLI jest modelowany w środowisku MATLAB Simulink. Zbudowano i przetestowano także eksperymentalny prototyp. Kompleksowe wyniki symulacji i eksperymentów są analizowane i porównywane w różnych warunkach operacyjnych. Wyniki pokazują, że proponowana IHO może osiągnąć minimalne THD w 31-MLI.

Słowa kluczowe

Keywords

Bibliografia

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