Abstract
Though the multilevel inverters hold attractive features, usage of more switches in the conventional configuration poses a limitation to its wide range application. Therefore, a renewed 7-level multilevel inverter topology is introduced incorporating the least number of unidirectional switches and gate trigger circuitry, thereby ensuring the minimum switching losses, reducing size and installation cost. The new topology is well suited for drives and renewable energy applications. The performance quality in terms of THD and switching losses of the new MLI is compared with conventional cascaded MLI and other existing 7-level reduced switch topologies using carrier-based PWM techniques. The results are validated using MATLAB/SIMULINK.
Highlights
The term “multilevel inverter” was rooted years ago
Multilevel inverters offer various applications in voltage ranging from medium to high such as in renewable sources, industrial drives, laminators, blowers, fans, and conveyors
Cascaded multilevel inverters were developed in the initial stage
Summary
The term “multilevel inverter” was rooted years ago. Multilevel inverters offer various applications in voltage ranging from medium to high such as in renewable sources, industrial drives, laminators, blowers, fans, and conveyors. H-bridge inverters have isolation transformers, and Hbridge cascaded MLIS were introduced to separate DC input sources They do not need either clamping a diode or flying capacitors. A 7-level MLI was generated with 9 switches reducing 3 switches from the main conventional CMLI [5]. The new MLI configuration is made of 5 switches eliminating 1 switch from the existing 6 switches, 7-level topology [7] in a special arrangement with 4 inputs DC sources to generate 7 level output. The proposed 7 level MLI as shown in Figure 5 is about redesigning of existing 6-switch topology eliminating 1 switch attaining the tag of 5 switch configuration. (a) PD PWM (b) POD PWM (c) APOD PWM Figure 7: Carrier alignment of carrier-based pwm techniques
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