Название: Pulse Width Modulation In Power Electronics
Автор: Isaak Mayergoyz, Siddharth Tyagi
Издательство: World Scientific Publishing
Год: 2021
Страниц: 419
Язык: английский
Формат: pdf (true), epub
Размер: 26.2 MB

This book provides a theoretical discussion of pulse width modulation (PWM) in power electronic inverters. Pulse width modulation is widely used for the frequency control of speed of ac motors, the design of uninterruptible power supplies (UPS) as well as the integration of renewable energy sources into existing power grid systems. PWM technique is based on approximation of sinusoidal waveforms by sequences (trains) of rectangular pulses whose widths are properly modulated. This width-modulation results in the suppression of low order harmonics at the expense of amplification of high order harmonics which are suppressed by energy-storage elements in load circuits.

Pulse width modulation techniques are used in inverters to approximate sinusoidal waveforms by sequences (trains) of rectangular pulses of the same peak value. This approximation can only be achieved if the pulse widths are properly modulated. A common feature of PWM techniques is the suppression of low order harmonics in the Fourier spectra of PWM voltages. This suppression is achieved at the expense of some amplification of high order harmonics in the Fourier spectra. However, these high order harmonics are efficiently suppressed in output voltages by energy storage elements (inductors and capacitors) of load circuits of the inverters. As a result, almost sinusoidal output voltages are achieved.

In the book, the main emphasis is on the discussion of conceptual foundations of PWM techniques. For this reason, the book has a very strong theoretical flavor. The discussion covers various PWM techniques. However, special efforts are made to present in detail the optimal time-domain PWM techniques advanced by the authors.