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...

Introduction: Multilevel converters are finding considerable attention in academia and industry as one of the preferred choices for high power conversion applications, such as traction drives, active filters, reactive power compensators, photovoltaic power conversion, uninterruptible power supplies, static compensators and flexible AC transmission systems. In general, multilevel converters are ...

The purpose of this paper is to present a linear quadratic simultaneous multi-model stabilizing approach based on simulated annealing algorithm. This method is developed to design robust control laws for AC drives. A specific application to a synchronous self-controlled motor is detailed. The main objective here is design a robust controller with predetermined structure. Experimental results ar...

Power MOSFETs first started appearing in 1976 as alternatives to bipolar transistors. These majority carrier devices were faster, more rugged, and had higher current gain than their minority-carrier counterparts. As a result, switching power conversion became a commercial reality. AC-DC switching power supplies for early desktop computers were among the earliest volume consumers of power MOSFET...

A new method for current control of multiphase drives is presented. The proposed control method is based on a model based predictive controller which minimises a predefined function cost. A voltage vector to minimise the current error is selected. A discrete-time model of the drive is also used to generate the control signals. Simulation and experimental results are provided. These preliminary ...

In this paper, a method for minimization of Total Harmonic Distortion (THD) is proposed in case of PWM inverter. Inverters are widely used in many applications such as in the UPS and ac motor drives resulting in harmonics production. A phase compensation Resonant Controller (RSC) is proposed for 1-phase pulse width modulation (PWM) inverter using MATLAB simulation. The simulation results are th...

The work presented in this paper proposes an approach to reduce the common mode voltage at the output of matrix converters when a direct torque control scheme is employed to drive a permanent magnet synchronous motor. A mathematical analysis of the common mode voltage at the output of matrix converters is firstly carried out which is then corroborated by simulation results. Based on this analys...

The high polarizability and dielectrophoretic mobility of single-walled carbon nanotubes (SWNT) are utilized to capture and detect low numbers of bacteria and submicron particles in milliliter-sized samples. Concentrated SWNT solutions are mixed with the sample and a high-frequency (>100 kHz) alternating current (AC) field is applied by a microelectrode array to enhance bulk absorption of the p...

EMC simulations are an indispensable tool to analyze noise propagation in power converters and assess the best filtering options. In this paper, we first show how set up of then demonstrate their use on example industrial AC motor drive. Broadband models key converter components reviewed combined into a circuit model complete setup enabling detailed analysis. The approach is demonstrated by ana...