This paper presents a technique to mitigate zero-sequence harmonics in power distribution systems. The method is based on the concept of passive zero-sequence harmonic filters. However, its basic configuration has been expanded to create a double-tuned filtering feature. This feature makes it possible to trap two harmonics with one filter and is especially attractive in solving harmonic-caused telephone interference problems. Furthermore, this paper has shown that common utility service transformers can be used to construct the filter. As a result, a practical and low-cost solution to mitigating zero-sequence harmonics has been found. A method for sizing and loading assessment of filters has also been developed. As an example application, the proposed filter package has been applied to mitigate a telephone interference problem. Issues, such as filter location, the number of filters required, and the effectiveness of filtering harmonics produced by distributed residential loads have been investigated. The results show that the proposed filter is a very promising technique to reduce zero-sequence harmonics in primary power distribution systems.
1 Abstract--This paper presents a novel scheme to mitigate harmonic distortions in modern residential distribution systems. The scheme deploys multiple low voltage filters in randomly selected locations of a distribution system. Main challenges of such a distributed filtering scheme, cost of installation and hardware, are solved through an innovative filter configuration and installation concept, namely, the filter is a 240V device that can be easily plugged into the sockets of utility revenue meters. Analytical, simulation, and economic studies have been conducted to understand the filter design parameters, performance characteristics, and cost implications. As an example application, the scheme is evaluated for mitigating an actual harmonic-caused telephone interference problem. The results show that the proposed scheme can be a promising option to reduce the harmonic distortions in selected areas of a distribution system. Index Terms-Power quality, harmonics, filter. 0885-8977 (c)
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