DESIGN AND ANALYSIS OF ACTIVE FILTERS IN POWER SYSTEMS WITH HVDC TRANSMISSION (OPTIMIZATION)

DANIEL WILLIAM HART, Purdue University

Abstract

A major source of power system harmonics is the line-commutated solid-state bridge converter. These converters have characteristic harmonics which can be identified and targeted for suppression. A further increase in such installations is predicted for a variety of reasons. Because the harmonics from these sources may effectively add to produce deterioration of the sinusoidal properties of the power system waveforms, harmonic suppression is essential even for modest installations. Filter performance is recognized to be system dependent. However, the power system is often ignored in the design and analysis of harmonic suppression devices because of the inability to either model of analyze easily the power system at harmonic frequencies. Recently, an important new tool has been developed that will enable the effect of the suppression device on the external system to be analyzed. The harmonic power flow algorithm recently developed by Xia and Heydt and implemented by Grady enables the examiner to determine the propagation of the characteristic harmonics of a converter throughout the power system. The central objective of this project focused on the design and analysis of a type of harmonic suppression device known as an active filter. A controlled harmonic current injection device is the basic component of the active filter. An algorithm for including this device in power system studies was developed and implemented in the harmonic power flow study program. A procedure was developed for optimizing a particular active filter configuration, known as a modified high-pass filter, on the basis of system performance. Required ratings of the filter components are determined in this analysis, and a comparison is made between an active filter and conventional passive filters in a test system.

Degree

Ph.D.

Subject Area

Electrical engineering

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