Abstract
We review the most common topology of multi-level inverters. As is known, the conventional inverters are utilized to create an alternating current (AC) source from a direct current (DC) source. The two-level inverter provides various output voltages [(Vdc/2) and (−Vdc/2)] of the load. It is a successive method, but it makes the harmonic distortion of the output side, Electromagnetic interference (EMI), and high dv/dt. We solve this problem by constructing the sinusoidal voltage waveform. This is achieved by a “multilevel inverter” (MLI). The multilevel inverter creates the output voltage with multiple DC voltages as inputs. Many voltage levels are combined to produce a smoother waveform. During the last decade, the multilevel inverter has become very popular in medium and high-power applications with some advantages, such as the reduced power dissipation of switching elements, low harmonics, and low EMIs. We introduce the information about several multilevel inverters such as the diode-clamped multilevel inverter (DC-MLI), cascaded H-bridge multilevel inverter (CHB-MLI), and flying-capacitor multilevel inverter (FC-MLI) with Power systems CAD (PSCAD) simulation. It is shown that THD is 28.88% in three level FC-MLI while THD is 18.56% in five level topology. Therefore, we can decrease the total harmonic distortion adopting the higher-level topology.
Highlights
Inverters are very useful for various industrial applications
Three major multilevel inverter configurations applied in industrial applications and mentioned
−2Vdc asymmetrical according to the regulating policy, but the choice of the two pairs leads to the switching state redundancy, which may utilize to attain the voltage balancing of FC-multilevel inverter” (MLI) [2,28,29]
Summary
Inverters are very useful for various industrial applications. In the last few years, the voltage-driving method has been adopted. To reduce the semiconductor transient voltage and current rating, a series and parallel connection method is needed. The limited standard three-phase converter is adopted up to the maximum allowable voltage of the load. Both the primary and the Pulse width modulation (PWM) switching frequency can be useful. A multilevel inverter has a key role in providing improved operating voltage beyond the voltage limits of conventional semiconductors. The explanation of a multilevel inverter is: “The multilevel inverter can demonstrate the switching skill very effectively with different voltage and current levels of its input or output nodes”. It is a practical reply to raise the Electronics 2019, 8, x FOR PEER REVIEW power capacity with a comparably low elements load and decreasing the output harmonics
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