Abstract
This paper presents a new boost inverter topology with nine level output voltage waveform using a single dc source and two switched capacitors. The capacitor voltages are self-balancing and thus is devoid of any sensors and auxiliary circuitry. The output voltage is twice higher than the input voltage, which eliminates the need for an input dc boost converter especially when the inverter is powered from a renewable source. The merits of the proposed topology in terms of the number of devices and cost are highlighted by comparing the recent and conventional inverter topologies. In addition to this, the total voltage stress of the proposed topology is lower and have a maximum efficiency of 98.25%. The operation and dynamic performance of the proposed topology have been simulated using PLECS software and are validated using an experimental setup considering a different dynamic operation.
Highlights
Multilevel inverters (MLIs) have emerged and evolved as a perfect solution for the medium and high voltage/power applications where high-quality dc-ac power conversion is needed
A new single-phase nine-level MLI topology has been proposed in this paper
The proposed nine-level boost inverter topology has been based on switched capacitors with a reduced number of switches
Summary
Multilevel inverters (MLIs) have emerged and evolved as a perfect solution for the medium and high voltage/power applications where high-quality dc-ac power conversion is needed. The authors in [13] proposed two new topologies with two dc voltage source along with two capacitors Both topologies generate nine levels of the voltage across the load. Both topologies use H-bridge for the polarity change, which requires switches with a higher voltage rating. Most of the SC-based topologies use single dc voltage source and the SC units are used to create different dc-link voltages for the multilevel output across the load. In [28], a new nine-level boost topology based on SC has been proposed to which the capacitors are charged in the first two levels and discharged to give the boost feature in the two states of the output voltage. Siddique et al.: Single DC Source Nine-Level Switched-Capacitor Boost Inverter Topology With Reduced Switch Count TABLE 1.
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