In many applications, cascading multilevel inverter (CMI) topologies are common. However, the biggest disadvantage of CMI is the need for many separate switches and DC sources. As a result, the CMI topology becomes more expensive, more complex, and larger, and its performance suffers. In the proposed SC-CHMI, only one DC source is used and the other DC sources are replaced by switched capacitor cells. Thanks to the self-balancing function, the capacitor charging process occurs naturally without the need for any auxiliary equipment. In the proposed SC-CHMI, the inrush current of the capacitor is attenuated using a load inductor or a front-end boost converter. To improve the performance of multi-level inverters, several types of techniques can be tested with existing multi-level inverters. Due to the modulation algorithm, modulation frequency, voltage drop on the switches and bus voltage modulation, the output voltage of the inverter has overall harmonic distortion, leading to overheating of the device and shortening the life of the device bag. In the proposed SC-CHMI, a level-shifted pulse width modulation technique is proposed to improve the output voltage quality and reduce the total harmonic distortion. This new control scheme is applicable to nine-level, eleven-level and fifteen-level SC-CHMI. The proposed topology can be used as a general-purpose inverter in renewable energy systems, due to its voltage gain characteristics, minimal number of switches, and single DC source. The effectiveness of the proposed inverter topology is confirmed by simulation results.
Multi-level inverter An inverter is a power electronic circuit that converts direct current into alternating current, used as a backup power source in the home. Nowadays, multilevel inverters are used in high-power switching applications. Multi-level inverters consist of several switches, used in industrial applications, railway and tram traction drives, etc.
A new single-source switched-capacitor cascaded half-bridge multilevel inverter (SC-CHMI) with voltage boosting features is implemented using MATLAB software. For the intended SC-CHMI, a single DC supply and fewer switches are required. The developed configuration, constructed from 10 switches for 9 level inverter 12 switches for 11 level inverter and 16 switches for 15 level . The proposed SC-CHMI topology also features a modular architecture and may be scaled up to a desired voltage level. In the suggested topology, the capacitors are charged via a charging inductor which removes inrush currents during the charging stages.Switching states are designed to ensure sufficient charging period for the capacitor, and hence no big ripple in the capacitor voltage.To drive switches of the inverter, LS-PWM(PD,POD and APOD) is applied.The performance of proposed SC-CHMI is evaluated in purely resistive load and resistive-inductive load.
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