Abstract
This article investigates the feasibility of using a simplified approach, based on the measurement of power ratio parameters, for harmonic emissions assessment at the point of common coupling (PCC). The proposed approach comes from the common concept of power factor correction and the definitions of the IEEE Std. 1459-2010, where line utilization and harmonic pollution levels are evaluated by means of ratios between the power quantities of the apparent power decomposition. In addition to the IEEE Std. 1459-2010 indicators, in this article, the behavior is studied of additional parameters that are conceptually similar to those defined by the IEEE Std. 1459-2010. The suitability of such parameters is discussed, for both single- and three-phase balanced/unbalanced cases, taking into account both their behavior in different scenarios and their effectiveness when the measurement uncertainty is taken into account. The study is supported by some simulation results that have been obtained on an IEEE benchmark power system, which allows reproducing linear and nonlinear load conditions, balanced and unbalanced operating conditions, and the presence of capacitors for power factor correction.
Highlights
T HE effective assessment of harmonic emissions and the detection of harmonic sources have been discussed for many years in the scientific literature
This work has been aimed at investigating the feasibility of using the IEEE Std. 1459-2010 power factors and other newly defined power ratio parameters for the assessment of harmonic emissions level at the point of common coupling (PCC)
A critical analysis has been made on measurement issues related to the evaluation of the IEEE 1459 parameters for line utilization and harmonic pollution parameters
Summary
T HE effective assessment of harmonic emissions and the detection of harmonic sources have been discussed for many years in the scientific literature. They are able to quantify the total amount of distortion; they cannot give information about the source of pollution For this last purpose, several approaches have been studied for assessing harmonic emission levels and locating harmonic sources; such methods have been based on both distributed measurements and single-point measurement at PCC [5]–[14]. The measurement of electric power quantities in sinusoidal or distorted conditions, in both balanced or unbalanced situations, is covered by the IEEE Standard 1459-2010 [18] It introduces some definitions of active, nonactive, and apparent powers, together with some indicators for harmonic pollution, line utilization, and load unbalance assessment (see Tables I and II). In this framework, Cataliotti et al [21] presented a preliminary study focused on the feasibility of using the IEEE 1459 indicators and new power ratio parameters for assessing harmonic emission levels at PCC.
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