Abstract
The cascaded multilevel inverters (MLIs) are suitable topologies when a high number of voltage levels are needed. Nonetheless, cascaded topologies possess the main drawback of a high number of power switches and gate drivers that make sophisticated control, reducing efficiency, and increasing cost. This article proposes a new fundamental switched-diode topology that is capable of generating five positive-voltage levels with only three power switches, three power diodes, and three dc voltage sources. Based on a combination of the n number of new fundamental topology, two cascaded topologies are proposed, which increases the number of voltage levels and decreases the number of power switches and voltage stress. The proposed cascaded topologies can operate in asymmetric dc sources, so different dc voltage source magnitudes are submitted to minimize the number of components. The main advantages of the proposed cascaded topologies are reducing the number of power switches, and gate drivers with reasonable dc voltage sources count in comparison with other state-of-the-art cascaded topologies. Furthermore, the proposed topologies reduce the cost in comparison with other recent MLI topologies. The power loss analysis and the recommended application for the proposed topologies are discussed. The simulation and experimental works are presented to verify the operation correctness of the proposed topologies.
Highlights
M ULTILEVEL power inverters create a higher number of voltage levels compared to the two level inverters that are widely used in medium-voltage high-power applications
Multi-level inverters (MLIs) can be applied in medium-voltage applications and have some advantages compared to conventional two level power inverters, in some power system conditions including static synchronous compensator (STATCOM), flexible alternating current transmission system (FACTS) devices, electrical vehicle (EV), AC motor drives, renewable energy sources (RES) [1]-[4]
The basic operation of MLIs can be found in three general topologies: neutral point clamped (NPC), flying capacitor (FC), and cascaded H-bridge (CHB) multilevel inverters [5]-[7]
Summary
Mohammad Ali Hosseinzadeh, Maryam Sarbanzadeh, Marco Rivera, Ebrahim Babaei and Patrick Wheeler. Abstract—The cascaded multilevel inverters are suitable topologies when a high number of voltage levels is needed. Cascaded topologies possess the main drawback of a high number of power switches and gate drivers that make sophisticated control, reducing efficiency, and increasing cost. This paper proposes a new fundamental switched-diode topology which capable of generating five positive voltage levels with only three power switches, three power diodes, and three dc voltage sources. Based on a combination of the n number of new fundamental topology two cascaded topologies are proposed which increase the number of voltage levels and decrease the number of power switches and voltage stress. The main advantages of the proposed cascaded topologies are reducing the number of power switches and gate drivers with reasonable dc voltage sources count in comparison with other state-of-the-art cascaded topologies.
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