Multilevel level single phase inverter implementation for reduced harmonic contents

Abstract

<p>Selective harmonic elimination technique SHE is adopted in this work to reduce the harmonic contents in single phase cascaded multilevel inverter. The firing instants for the electronic switches MOSFETs in the inverter are calculated off line for five level to thirteen level inverter. An Arduino microcontroller is programmed to cope with different topologies of the multilevel inverter. The implemented multi-level (MLI) inverter results are compared with Simulink simulation program and are found very close to each other. SHE technique works at system frequency (50 Hz or 60 Hz) and the switching losses are very small. The sinusoidal pulse width modulation SPWM requires a carrier frequency not less 20 times the system frequency so SHE approach is found to be superior compared with SPWM. Also, SHE technique shows significant reduction in THD as the number of levels increased. Results for the output voltages and currents along with their frequency spectrum are shown and compared with traditional SPWM.</p>

CSA-based harmonic elimination controlled reduced switch multilevel inverter for standalone PV system

“…Seven insulated gate bipolar transistor (IGBT) switches with antiparallel diodes are utilized in the topology. The capacitor value is chosen 2200 µF with minimum voltage ripple consideration [22]. The proficiency of control techniques verified by applying SHE-PWM control using CSA.…”

“…An improved genetic algorithm-based control in [21] is applied for an asymmetrical 9-level inverter to suppress the 5 th , 7 th , and 11 th -order harmonics. The fundamental frequency SHE scheme has been compared with a high-frequency pulse-width modulation scheme in [22]. Tests are carried out on the 7-level inverter to justify the advantages of the SHE schemes.…”

Design and implementation of reduced number of switches for new multilevel inverter topology without zero-level state

“…Furthermore in 2021 [21], a detailed survey on MLI such as symmetric, asymmetric, hybrid and modularized were introduced in order to generate 81-level. Besides reducing number of switches, reducing the number of harmonics at the output of inverters are of great importance [22]- [24].…”