International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 04 | Apr 2023
p-ISSN: 2395-0072
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Three Phase Seven-level Triple Voltage Booster Switched-Capacitors based Multilevel Inverter with Minimum Components Vikram Singh Sehmi1, Dr. Nagendra Tripathi2 1M.Tech. Student, Department of Electrical Engineering, Bhilai Institute of Technology, Bhilai (C.G.), India 2Professor, Department of Electrical Engineering, Bhilai Institute of Technology, Bhilai (C.G.), India
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Abstract: This research proposes an economically feasible 3-phase triple-gain switched-capacitor (SC) multilevel inverter (MLI) configuration. The proposed structure has one source and uses the fewest switching components possible to produce an output voltage waveform with seven levels from line to line. The newly proposed SCMLI configuration features a built-in capacitor voltage balancing capability and uses two switching capacitors per phase leg. Level shift pulse width modulation approach, operating theory, and structural description have all been discussed. To demonstrate the merits of the proposed work with the existing topologies, a fair comparison study has been provided. The simulation results show that the proposed SCMLI configuration is feasible and has been verified theoretically.
Keywords: Three Phase Multilevel Inverter; Seven Level MLI; Economically Feasible Inverter Design, SCMLI. 1. Introduction The population and industrialization are expanding quickly, which increases the usage of traditional energy sources and greenhouse gas emissions [1]. There has been a lot of focus on sustainable energy sources as a way to slow down the rate at which conventional energy sources are used up. However, electricity is produced by a variety of renewable energy sources, including solar photovoltaic, wind, and fuel cells. Solar and wind are the most widely used renewable energy sources due to their accessibility, environmental friendliness, and improvements in power semiconductor technology. Due to the relatively low output power from this source, it will not meet the requirements for power quality for applications like electric and fuel cell vehicles, grid connections, and industries. As a result, a transformer or boost converter must be used to increase the output voltage. The use of the transformer makes the system big and expensive. An extensive amount of study has been done on the converter to increase the output voltage. Among these converters, multilevel inverters are essential for power conversion owing to improved power quality, enhanced performance, and low, medium, and highpower applications. The cascaded H-bride (CHB), the flying capacitor (FC), and the neutral point clamped (NPC) inverter are the three primary topologies of the conventional multilevel inverter [2]. Every topology has advantages and disadvantages. A modularity feature, for example, is present in the common CHB. However, the need for isolated DC sources is its principal drawback. For NPC and FC topologies, the availability of clamping diodes and capacitors, respectively, and the accompanying voltage balance concerns provide a difficult problem. The uses of conventional inverters are constrained by these undesirable characteristics. In this context, research has concentrated on designing MLIs topologies that use the fewest possible power electronic components while still producing improved voltage waveforms [3, 4]. The ability to increase voltage is a key worry with such topologies, though. Researchers from all over the world have looked into the switched capacitor (SC) concept as a way to lessen the aforementioned limit. Such MLIs structures based on SC display exceptional voltage boosting capabilities, capacitor self-voltage balancing, and a greater number of levels due to its modularity characteristic. Based on the SC principle, the topologies [5-7] have properties of modularity. These designs are, however, constrained by high voltage stress on the power switching devices. A basic cell unit can generate an output voltage waveform with seven levels using the topology described in [8]. Despite having a symmetrical voltage source, the topology is less desirable and more expensive due to the need for numerous sources and a polarity generator. The gain is lower and there are more switching components in the architecture [9-11]. Another seven-level topology [12] also employs more switching components while gaining less than unity. The arrangement [13] has seven levels and three times the input voltage source's voltage boosting capabilities, furthermore, its drawback is that it causes undesirable voltage stress across the switches. Voltage boosting is not possible with the designed structure for the topologies shown in [14-17]. An innovative ANPC inverter that may generate maximum voltage levels while maintaining unity or a higher voltage gain was explored in the structures in [18–21]. Moreover, the overall component count is decreased, and complex balancing controls are not necessary. In [22], a unique SC T-type inverter is presented that soft-charges its integrated switching capacitors to
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