This paper presents a random space vector pulse width modulation (SVPWM) strategy for a three-phase voltage source inverter based on Field Programmable Gate Array (FPGA). It is more flexible and faster to realize randomization algorithm in FPGA than digital signal processor (DSP). What's more, it is easily extensible for multiphase driving systems with FPGA. Models in Simulink and an experiment platform with FPGA have been built up. Results of experiments have proved the correctness of the proposed strategy and the effectiveness and feasibility of implementation using FPGA.

Implementation of random SVPWM strategy for three-phase voltage source inverter based on FPGA

The purpose of the article is: to determine the dynamic properties of automatic control systems of the pulse DC voltage converter with one-way and two-way modulations by studying the influence of the form of the reference signal on dy-namic processes in the systems of automatic control of the output coordinate of the converter with widely used propor-tional (P), integral (I) and proportionally - by integral (PI) regulators. The novelty of the proposed work lies in the de-termination of the influence of one-sided and two-sided pulse width modulation on the stability and conditions of the process of the finite duration of the automatic control system of the pulse converter of constant voltage. The dynamic characteristics of the system are investigated using impulse models of the pulse DC voltage converter and the use of the Z-transformation mathematical apparatus and simulation modeling. Analytical dependencies were obtained: stability conditions for proportional, integral and proportional-integral regulators; conditions of the process of finite duration of finite duration in a system with an aperiodic link in the load circuit; oscillograms of transition processes that confirm the theoretical results. The practical value lies in the fact that the results obtained in the work provide, during the de-velopment of an automatic regulation system with given parameters, the possibility of optimal selection of the type of pulse-width modulation. References 17, figures 15.

/pdf/features-of-dynamic-characteristics-of-regulation-systems-gkm7sfo9.pdf

Features of dynamic characteristics of regulation systems with one-sided and two-sided pulse-width modulations

This paper reviews the analysis of modulation techniques on A.C inverter in relation to harmonic pollution and reliability. Modulation techniques applications, advantages and disadvantages has been discussed, and methods of implementation are highlighted. Inverters have been faced with harmonic contents pollution in its output current and voltage waveforms. In comparison of different modulation techniques, Key Performance Indicator (KPI) is less time of execution, cheaper or cost-effective method, of implementation are the selection criterion. Modulation techniques discussed were applied on a Single-Phase topology on a full-bridge inverter. It has been proved from the analysis that, a Sinusoidal pulse width modulation (SPWM) technique, shows to be the best method that meet the selection criteria of modulation technique in this paper. The findings on modulation techniques are based on literature review and no experimental work has been conducted.

Analysis on Basics of Modulation Techniques for AC Drive on Efficiency Improvements

Random PWM techniques have been employed in most of the industrial drive applications. Sinusoidal Pulse Width Modulation (SPWM) techniques for AC drives have been developed in the early 1990s, but they failed to yield acceptable level of fundamental voltage. Acoustic noise is found to be more in SPWM. To overcome the drawbacks, Random Pulse Width Modulation (RPWM) techniques are introduced. This paper proposes a saw tooth carrier based RPWM for Voltage Source Inverter (VSI) fed Induction Motor (IM) drives. Simulation results prove that proposed RPWM is found to better than conventional RPWM.

Sawtooth carrier based Random PWM technique for AC drives

PSO Based Optimal Random PWM for Three Phase Induction Motor Drives

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Sawtooth carrier based Random PWM technique for AC drives

PSO Based Optimal Random PWM for Three Phase Induction Motor Drives