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

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Normally more than 3 filters are connected in a system to reduce the harmonics. The first two filters are connected in order to reduce the effect of harmonics which are less effective and then a high pass filter is used. Figure 6 and 7 shows shunt and series connected passive filters respectively. Figure 6: Shunt Passive Filter Block. [3] Figure 7: Series Passive Filter Block. [3] 16
3.4 Active Filters : Active filters are a perfect alternative to the passive filters. The active filters are used in a condition where the harmonic orders change in terms of magnitudes and the phase angles. In such conditions it is feasible to use the active elements instead of passive ones in order to provide dynamic compensation. The active filters are used in nonlinear load conditions where the harmonics are dependent on the time. Just like the passive filters, active filters can be connected in either series or parallel depending on the type of sources which create harmonics in the power system. The active filters minimize the effect of harmonic current by using the active power conditions to produce equal amplitudes of opposite phase there by cancelling the harmonics that are caused in the nonlinear components and replace the current wave from the nonlinear load. Advantages of Active Filter over Passive Filter: • One of the main advantage of using an active filter over the passive filter is that it can be used to reduce the effects of harmonics of more than one order. • Active filters are also useful in flickering problems that are caused in the power system. One disadvantage of an active filter over a passive filter is that Disadvantages of Active Filter over Passive Filter: • Active filters cost more than the passive filters • Active filters cannot be used for small loads in a power system 17
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: Figure 4 : Three Phase, Three Wire
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 and 40: Note: For figures 16 and 17, • ts
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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