The mathematical underpinning of the pulse width modulation (PWM) technique lies in the attempt to represent "accurately" harmonic waveforms using only square forms of a fixed height. The accuracy can be measured using many norms, but the quality of the approximation of the analog signal (a harmonic form) by a digital one (simple pulses of a fixed high voltage level) requires the elimination of...

This paper explains a control strategy SHE-PWM and a closed loop control of the cascaded multilevel inverter based on the modulation index. The modulation index is taken as the feedback to the cascaded multilevel inverter, the proposed system reduces the total harmonic distortion by optimizing the angles of the inverter and the DC voltage sources applied to the cascaded inverter. The specific l...

A new optimization method is proposed in this paper for finding the firing angles in multi-level voltage source inverters to eliminate low-order selective harmonics and reduce total harmonic distortion (THD) value of the output voltage. For thid end, Fourier series is used for calculating objective function and selecting specific harmonics. Regarding the nature and complexity of the employed no...

Selective harmonics elimination (SHE) is one of the prominent technique that is used to produce required fundamental voltage of multilevel inverters with elimination of selective harmonic orders. The SHE equations are nonlinear equations and are also termed transcendental equations owing to the fact that these equations contain trigonometric terms. Attempt has been made in previous works to sol...

The total number of switching pulses permitted in one-quarter the fundamental-cycle an inverter is restricted due to restrictions losses high-power devices. elimination major low-order dominating harmonics using SHEPWM (Selective Harmonic Elimination) suggested this research paper. positive or negative voltage transition at instant where fundamental has greatest slope distinguishes various type...

Continuous-wave Doppler radar is an established method for non-contact heart rate estimation. The output signal of the includes fundamental wave a heartbeat, heartbeat harmonics, respiration, respiration and artifacts due to body movement. harmonics degrade accuracy To this end, novel estimation proposed that uses adaptive notch filters (ANFs). First, system estimates frequency. Next, cascaded ...

This article considers ${l}$ -level cascaded H-bridge (CHB) inverters and proposes a new modulation method based on pulse active width (PAWM), capable to minimize all harmonics with order notation="LaTeX">$n< 2l+1$ satisfy the Euro...

Multilevel inverters (MLI) are becoming more common in different power applications, such as active filters, elective vehicle drives, and dc sources. The Multi-Group Marine Predator Algorithm (MGMPA) is introduced this study for resolving transcendental nonlinear equations utilizing an MLI a selective harmonic elimination (SHE) approach. Its applicability superiority over various SHE approaches...