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A cascaded H-bridge multilevel inverter offers important advantages over the conventional two-level topologies, though it necessitates isolated input dc sources. Even power distribution amongst these sources is an important control issue for an enhanced life-time of the overall system. In currently used control schemes, for ‘n’ number of input sources and a fundamental period ‘T’ for the output voltage,...
The newly emerged packed U-cell (PUC5) inverter topology is investigated in this paper considering the design criteria, switching technique, voltage balancing of DC capacitor and switches voltages ratings. Afterwards, It is compared with other popular multilevel inverter topologies such as 3-level full-bridge (FB), 5-level cascaded H-bridge (CHB), neutral point clamped (NPC) and T3, in terms of components...
Multilevel inverters are the new structures of power electronic circuits that are used in high voltage DC-AC conversion systems. These kinds of inverters create more output voltage levels in which reduce the harmonic components. In this paper, a new three source multilevel inverter is proposed that consists of eight switches in basic structure. Proposed topology is aimed in symmetrical and asymmetrical...
This paper presents a general and yet fast multilevel space-vector modulation technique, based on orientation of reference point in terms of hexagon lines. The main advantage of the proposed algorithm is the reduced volume of calculations that consequently makes it possible for implementing on cheaper microprocessors. The introduced technique in finding the reference vector location is extended to...
This paper presents a new voltage-balancing method of five-level neutral-point clamped inverter, based on space-vector modulation redundant switching states. The proposed method uses measurement of DC-link capacitors and output phase currents in order to determine the best fitted redundancies. Due to its severe approach, the proposed method provides relatively low voltage ripples using low-capacitance...
In this paper, Selective Harmonic Mitigation (SHM) and Selective Harmonic Elimination (SHE) modulation techniques are combined to generate the appropriated firing pulses for a 4-leg 3-Level Neutral Point Clamped (NPC) inverter. SHM modulation technique is applied to the phase legs in order to get a desired modulation index (ma) and to mitigate the lower order odd non-triplen harmonics (5th, 7th, …)...
One of the most suitable topologies for multilevel inverters is Cascade H-Bridge that contains full-bridge single-phase inverters. In this paper a similar cascaded structure is proposed which is made by half-bridge single-phase inverters. The proposed topology generates higher output voltage and power using the same switches and DC buses as full-bridge one. In other word, it can generate the same...
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