This paper presents a single-phase seven level Cascaded H-Bridge DC-Link (CHBDCL) inverter for marine electric propulsion drives. The speed of propulsion drive can be changed by CHBDCL inverter by converting DC output from the rectifier to variable output voltage with or without change in frequency. The proposed CHBDCL inverter generates more output voltage with minimum harmonic content than classical Multilevel Inverters (MLIs). The CHBDCL inverter necessitates only ‘m + 3’ power devices for ‘m’ number of levels, although the classical MLIs requires ‘(2m − 1)’ power devices. CHBDCL inverter can have the effective performance by utilizing unipolar Sine Pulse Width Modulation (SPWM) and unipolar Space Vector PWM (SVPWM) with sine carrier. The effectiveness of the proposed CHBDCL inverter topology has been verified by using MATLAB/SIMULINK for various modulation indices in terms of voltage levels and harmonic analysis. Furthermore, an experimental setup involving pulse generation from a Field Programmable Gate Array (FPGA) has been used to test the performance of the proposed CHBDCL inverter.
This paper presents a solar-powered interleaved high-gain boost converter (IHGBC) that increases voltage gain with fewer ripples in the output voltage in comparison to existing DC–DC converters. The goal of this research is to develop a hybrid-based maximum power point tracking (MPPT) approach with the combination of a flower pollination (FP) algorithm assisted with a perturb & observe (P&O) MPPT approach for solar photovoltaic (SPV) systems integrated with IHGBC. To ensure effective usage of both FP and P&O algorithms, this study incorporates and validates the hybrid-based MPPT approach. The proposed solar-powered IHGBC with a hybrid-based MPPT algorithm has been computationally modelled and simulated using MATLAB® and Simulink® for both uniform and non-uniform irradiation and analysed for voltage gain, ripples in the output waveforms and convergence time. The proposed hybrid-based MPPT is based on a number of flowers that forecast the initial global peak, assisted by P&O in the last stage for faster convergence to attain the maximum power point (MPP). As a result, the hybrid-based MPPT approach alleviates the computational issues encountered in P&O and FP-based MPP approaches. The proposed hybrid MPPT is compared with conventional MPPT for SPV and the results show that the solar-powered IHGBC using a hybrid-based MPPT technique has negligible oscillations of 0.14% with a high-voltage gain of 7.992 and a fast convergence rate of 0.05 seconds compared to individual P&O-based MPPT and FP-based MPPT techniques. The simulation results of the proposed MPPT with IHGBC outperform the conventional MPPT with high-gain converters.
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