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

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harmonic effect. Figure 1 shows a single phase representation of distribution system with the nonlinear load and passive shunt filter. Figure 1 : Single Phase Representation of Non Linear load and Passive Shunt filter [3] One of the most important aspect in installing the passive filters in the power system is that they should be installed based on the order of the harmonics that are supposed to be filtered. For example, in order to install a filter for the 3 rd order of harmonics, it is required that the filter of 1 st order of harmonics is already installed. In order to reduce the harmonic effect, the passive filters create a resonance frequency. This resonance frequency is kept away from the nonlinear load’s harmonic distortion. Also, the passive filters are caliberated at a point which is a bit lower than the point at which the harmonics is supposed to be reduced so that, if there is any change in the parameters there is still margin for improvement. If this is not done, then there might be a condition in power system due to capacitance and inductance of filter that the resonance is shifted causing unfavourable conditions in the power system. [3] 12
3.3.1 Types of Passive Filters: There are two types of passive filters : • Shunt Passive Filters and • Series Passive Filters These filters are used for single phase and three phase power system. One important thing to note is that, more than one shunt and series passive filters can be used with and without each other in a system. Some of the basic differences between the shunt passive and series passive filters are as follows. • The shunt passive filters carry only part of the total load current while the series passive filter carries full load current. • The shunt passive filters are cheaper compared to the series passive filters so they are used more often than the series passive filters. Figure 2 and 3 shows the single phase passive filter with shunt and series configuration respectively. 13
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: 3.2 Roles of Filters in Power Syste
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 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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