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

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5.1 Introduction Chapter 5 SIMULATION AND CALCULATIONS This chapter shows how harmonic elimination is done in Inverter by Pulse Width Modulation technique by solving the non linear equations. Equations are used to determine switching angles of an Inverter. Switching angles play an important role to produce the desired output by eliminating selected harmonics. In order to form the equation set, fundamental component is given desired output value and all other harmonics are equated to zero. In my simulation I find the switching angles for the 5 th , 7 th and 11 th harmonics. [9] The equation which is derived for Total Harmonic Distortation of the the output voltage of an inverter is used in order to reduce the harmonics that are produced in the inverter. The percentage of the Total Harmonic Distortion is given by the following formula.[9] %THD = x 100 where n = 6i ± 1(i = 1,2,3….) The switching angles which are required for the THD are calculated as shown in the figures and the simulation codes. The codes for THD is also shown in detail. Simulation Results: 32
Figure 18 : Plot of Switching angle (ſ1 ) Vs Modulation index 33
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 and 38: order to reduce the harmonics is kn
Page 39: Note: For figures 16 and 17, • ts
Page 43 and 44: Figure 20 : Plot of Switching angle
Page 45 and 46: Figure 22 : 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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