HARMONIC REDUCTION IN POWER SYSTEM Ankit Vashi B.E. ...

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4.3.3 Sinusoidal Pulse Width Modulation Sinusoidal Pulse Width Modulation is a bit different compared to the Sinusoidal Pulse Width Modulation. In case of sinusoidal pulse width modulation, all the pulses are modulated individually. Each and every pulse is compared to a reference sinusoidal pulse and then they are modulated accordingly to produce a waveform which is equal to the reference sinusoidal waveform. Thus, sinusoidal pulse width modulation modulates the pulse width sinusoidally.[6] Figure 17 shows a representation of Sinusoidal Pulse Width Modulation. Figure 17 : Representation of Sinusoidal Pulse Width Modulation [6] 30
Note: For figures 16 and 17, • ts = Time of the triangular waveform • fs = frequency of the triangular waveform • Vref = Reference voltage of the square or sinusoidal waveform • Vp,ref = Peak value of the reference voltage • to = Time of the output waveform of the Inverter which is desired • fo = Frequency of the output waveform of the Inverter which is desired • ma = Amplitude modulation index of Inverter • mf = Frequency modulation index of Inverter • k = Number of pulses per half cycle 31
Page 1 and 2: HARMONIC REDUCTION IN POWER SYSTEM
Page 3 and 4: I certify that this student has met
Page 5 and 6: TABLE OF CONTENTS List of Figures
Page 7 and 8: LIST OF FIGURES 1. Figure 1: Single
Page 9 and 10: Chapter 1 INTRODUCTION The term har
Page 11 and 12: 2.2 Transients: In terms of power s
Page 13 and 14: obtained during the event is consid
Page 15 and 16: Non-linear loads are considered as
Page 17 and 18: an inductance is a passive filter.
Page 19 and 20: 3.2 Roles of Filters in Power Syste
Page 21 and 22: 3.3.1 Types of Passive Filters: The
Page 23 and 24: Figure 4 : Three Phase, Three Wire
Page 25 and 26: 3.4 Active Filters : Active filters
Page 27 and 28: Figure 9 : Single Phase Active Filt
Page 29 and 30: Theoretically the output voltage wa
Page 31 and 32: consists of four IGBT devices (also
Page 33 and 34: 4.2.3 Multi Level Inverters : Figur
Page 35 and 36: converters, the main objective is t
Page 37: order to reduce the harmonics is kn
Page 41 and 42: Figure 18 : Plot of Switching angle
Page 47 and 48: cos(7*s1)-cos(7*s2)+cos(7*s3)-cos(7
Page 49: REFERENCES 1.) Roger C. Dugan, Mark

HARMONIC REDUCTION IN POWER SYSTEM Ankit Vashi B.E. ...

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