Establishment of typical harmonic voltage levels in radial distribution systems

Abstract

This paper reports on a simple method to identify problem areas with relation to harmonic distortion within radial distribution systems at the planning stage. The purpose of the work is to produce a simple method of establishing harmonic distortion levels throughout a study distribution system when only limited system data and load information is available. The preliminary work presented in this paper is aimed at establishing useful planning guidelines for utilities to help with the analysis of harmonics in medium voltage (MV) distribution systems during the design phase. Harmonic analysis during the design of a distribution system is seen as an important step in controlling harmonic distortion levels. Abstract: This paper reports on a simple method to identify problem areas with relation to harmonic distortion within radial distribution systems at the planning stage. The purpose of the work is to produce a simple method of establishing harmonic distortion levels throughout a study distribution system when only limited system data and load information is available. The preliminary work presented in this paper is aimed at establishing useful planning guidelines for utilities to help with the analysis of harmonics in Medium Voltage (MV) distribution systems during the design phase. Harmonic analysis during the design of a distribution system is seen as an important step in controlling harmonic distortion levels. Disciplines Physical Sciences and Mathematics

Probabilistic assessment of the impact of distributed generation and non-linear load on harmonic propagation in power networks

“…These random values are selected from uniformly distributed ranges. The selection of uniform distribution was based on several past reports [8,14,15]. Four harmonic spectra are used for the selected loads.…”

“…It is a common practice to take harmonic measurements for at least one week, and to compare the 95th percentile of the measured THD with the planning values specified in relevant standard. Based on that comparison the utility could get penalized if the limit is exceeded [8]. However, a recent survey performed by ERGEG with different types of respondents (utilities, academia, research centers) stated that most of the respondents agreed that "95%-of-time" clause should be avoided and the limits should be applied for 100% of the time, to have a more efficient and transparent voltage quality limits.…”