Two-level inverters are the most basic kind of multi-level inverter (MLIs). Total harmonic distortion diminishes as the number of output levels is increased. In classic MLI topologies, more electronic components are utilized to get higher-level outputs, which raises the cost, complexity, and volume of typical MLI installations. By reducing the use of power components, overall costs can be reduced. Further, the two and three-level inverters produce constant dv/dt output, which increases the stress on the power switches. This research proposed an asymmetric MLI topology that is suitable for PV applications and utilizes a minimum number of components. A selective harmonic elimination-based pulse width modulation (SHEPWM) is implemented for the proposed inverter to eliminate the lower-order dominant harmonics. The non-linear transcendental equations produced by the SHEPWM are solved for the switching angles of the proposed inverter using the Newton-Raphson approach. The performance of the inverter is analyzed based on the THD of output for different operating levels of the inverter. In this research, the NR method yielded a THD of 7.3% at a 0.9 modulation index. Also, the proposed inverter is applied to grid-connected solar PV systems for the analysis of THD.T The THD of the grid voltage is measured as 0.06% and the THD of the grid current is 4.8% with the proposed inverter which is acceptable as per the IEEE519 standards.
Recent Advancements in the semiconductor technology leads to the use of Silicon Carbide (SiC) materials in the design of power switches due to its wide band gap that performs superior compared to conventional Silicon material. Nevertheless, the cost of manufacturing IGBT with the SiC material is of major concern. Hence, this article proposes a hybrid Si-SiC based IGBT to improve the performance and reliability. The hybrid Si-SiC IGBT consist of Si-IGBT with SiC Feedback Diode. A test case of 600V/30A hybrid Switch (Si-IGBT (IGW30N60H3)/SiC-diode (C3D20060D)) is considered and implemented on a 3 kW PV inverter. Mission Profile oriented reliability analysis is carried out using PLECS thermal model at two different atmospheric conditions and its effectiveness is evaluated in comparison with conventional Si IGBT. Monte Carlo simulation is implemented to calculate the B 10 lifetime. The population size of 10000 with 5 % variation is considered. The improved B 10 lifetime and reliability with the proposed hybrid Si-SiC IGBT is obtained at both India and Denmark locations.
While designing the inverter, the total harmonic distortion (THD) in the output is a major concern to decide its performance. In order to calculate the total harmonic distortion (THD) of a symmetric modular multilevel inverter (MMI) with switched capacitors, a Harris hawk optimization (HHO) was used in this study. Utilizing symmetric and identical DC sources, the suggested modular multilevel inverter is designed. The suggested topology may be expanded up to many levels and utilizes fewer switches to provide 9 levels of output than conventi1al cascaded H-bridge multilevel inverters. Using a low-frequency switching control approach known as selective harmonic elimination pulse width modulation, the switches are less stressed and the inverter output's THD profile is improved. Additionally, the switching angles of the MMI have been optimized by solving the non-linear equations of the SHEPWM using the Harris Hawk Optimizer. Ant colony optimization (ACO) and particle swarm optimization (PSO), two alternative optimizers, were compared in terms of the THD of the output. This comparison shows that the HHO delivers a lower THD than other optimization techniques approximately near to 5%, as per the IEEE-519 standard, and is thus more highly advised. Finally, a hardware configuration for the suggested inverter is implemented to confirm the simulation findings.
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