Book

Pulse Width Modulation for Power Converters : Principles and Practice

ISBN: 0471208140
Source: IEEE Xplore

ABSTRACT An integrated and comprehensive theory of PWM The selection of the best algorithm for optimum pulse width modulation is an important process that can result in improved converter efficiency, better load (motor) efficiency, and reduced electromagnetic interference. However, the identification of the best approach is a complex process requiring extensive mathematical manipulation. Pulse Width Modulation for Power Converters: Principles and Practice is the first single-volume resource written to help researchers in the field attain a working knowledge of the subject. The authors bring together today’s seemingly diverse approaches into a single integrated and comprehensive theory of modulation. The book provides a generalized approach to the fundamentals of PWM, looking at:
Active switch pulse width determination
Active switch pulse placement within a switching period
Active switch pulse sequence between phase legs and across switching periods
The main benefit of this generalized concept is that once the common threads are identified, the selection of a modulation strategy for any converter topology becomes immediately clear, leaving only secondary factors, such as practical performance, cost, and difficulty of implementation to consider. Additionally, it allows the performance of any particular converter topology and PWM strategy to be quickly and easily identified without complex and time-consuming analysis. Pulse Width Modulation for Power Converters: Principles and Practice enables the reader to achieve optimum PWM results for any application.

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    ABSTRACT: The authors have recently proposed a novel modulation strategy for Voltage Source Inverters (VSI) which utilizes feedback applied around the inverter treated as a quantizer - Feedback Quantizer Modulator (FBQM). On the surface, FBQM has some similarities with Sigma Delta Modulator (SDM). However, the authors believe that FBQM is a genuine and substantial generalization of the feedback based modulation, and are presenting in this paper a comparative analysis detailing similarities as well as fundamental differences. Distributed spectrum of the inverter noise and flexible noise shaping are the two major features of FBQM which make it an attractive option in certain applications. When using FBQM of VSI as a part of a closed loop current control, current sampling is not ripple-free due to a random nature of generated voltage waveforms. In this paper the authors also propose an effective strategy to reduce the effects of non-ripple-free current sampling. The comparative study and proposed strategies are supported by detailed simulations in physics-based Saber environment, as well as experimental results.
    IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society; 01/2012
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    ABSTRACT: This paper takes a new look at the mechanisms underlying the double-edge pulse-width modulation (PWM) process. It presents a novel way of deriving equations for the spectrum of double-edge PWM using basic mathematical techniques. In the process the underlying nonlinearities that generate the PWM sidebands are identified. Unlike the classical double Fourier series approach, the proposed method of deriving the PWM spectrum does not require the construction of the so-called unit cell. The interaction between this new model of the pulse-width modulator and the regular sampling process is studied, and generalized equations for the Fourier transforms of regularly sampled PWM waveforms are derived. A general solution to the important question of what happens to the PWM spectrum when the PWM reference consists of a summation of signals is presented. It is shown that the addition of reference signals in the time domain results in a double convolution of the PWM sidebands in the frequency domain. As an application of this result, it is shown how new analytic equations for the harmonics of third-harmonic injection PWM and space vector modulation can easily be derived. Finally, the new theoretical results are benchmarked against results from the well-established double Fourier series method.
    IEEE Transactions on Power Electronics 12/2014; 29(12):6762-6778. DOI:10.1109/TPEL.2014.2304677 · 5.73 Impact Factor