The conventional SVPWM algorithm gives good performance for control of induction motor drive, but it produces more acoustical noise resulting in increased total harmonics distortion. The random pulse width modulation (RPWM) techniques has become an established means for mitigation of undesirable side effects in PWM converters, the use of voltage source inverters in adjustable speed ac drives in...

A novel random pulse width modulator with varying switching frequency but constant sampling frequency is proposed for application in voltage source inverters for adjustable-speed ac drives. Harmonic Spread Factor is introduced for quality evaluation of voltage spectra of inverters with the random PWM. Realization of the modulator using the Texas Instruments' TMS320F240 DSP controller is describ...

Pulse width modulation (PWM) is a powerful technique employed in analog circuit convert with microprocessor based digital output. Besides, Pseudo Random Multi Carrier (PRMC) involves two random PWM strategies to minimize the harmonic order for 9- level cascaded multilevel H-bridge (CHB) inverter and 9-level Modular Multilevel are introduced. The design mainly focuses on (Pulse Width Modulation)...

1 Properties of the ideal rectifier.techniques programming interview exposed pdf as: multipulse rectifiers, active filters and PWM rectifiers Fig. Similar to the PWM active filter, the PWM rectifier has a complex control structure, the.PWM Rectifier with Active Filtering. Institute of Control and Industrial Electronics.source PWM rectifiers in programming logic controllers pdf different process...

Aiming at the electromagnetic radiation and noise problem resulting from the electric drive system, the application of the random space vector PWM (SVPWM) strategy is proposed to be used in the electric vehicle (EV). The random SVPWM strategy is introduced firstly. Furthermore, the closed-loop control system is analyzed based on the vector control method using the random SVPWM technology. Final...

Multilevel PWM waveforms can be decomposed into several multilevel PWM components. Phase-shifted carrier (PSC) is an efficient decomposition technique. In this paper, we have first demonstrated the equality of PSC and alternative phase opposition disposition techniques. Second, we have modified PSC to accommodate other disposition techniques. Third, we have investigated the effects of using...

PWM techniques are becoming popular in the present day applications due to the control of amplitude and frequency in the output voltage from VSI. There are two popular approaches for the implementation of PWM Algorithms. Carrier based and Space Vector Approach. Both the approaches give the same performance, but due to simplicity, mostly carrier based approach has been preferred. A large variety...

This paper presents a review of conventional and novel carrier-based PWM methods that are used for control of multilevel inverters. Among the discussed methods are Phase disposition (PD) PWM, Opposite Phase disposition (POD) PWM, Alternative Phase disposition (APOD) PWM, Phase Shifted PWM and Asymmetrical PWM. The paper shows the simulation results and comparison of these methods. Key-Words: Re...