Abstract
In this article, a method that allows sharing responsibilities for the generation of harmonic currents between the utility and consumers powered by one point of common coupling (PCC) is addressed. For these purposes, mathematical modeling of the power supply system (PSS) with two consumers is carried out in order to introduce new indices using the simplest PSS structure as an example. Two indices are introduced that quantify the consumers’ contribution to the distortion of current and voltage at the PCC and that evaluate harmonic emission from the utility side. Experimental tests are carried out where both linear and nonlinear loads are considered, capacitive loads are taken into account, and harmonic distortions from the utility side are modeled to show the applicability of the indices in a wide range of load types. The experiments confirmed the theoretical results and illustrated that the quantitative assessment of the contributions is unambiguous. It suggests that the proposed criterion could be a reasonable basis for further tax policy on harmonic pollution for each consumer at the PCC and for the utility.
Highlights
The uses of nonlinear loads are rapidly increased at the different types of industrial enterprises
Calculated by the proposed method, the consumer’s contribution to the current and voltage distortion at the point of common coupling (PCC) for each harmonic has a negative value for M. It indicates that the harmonic current flowing through the motor compensates for the non-sinusoidal current caused by the presence of thyristor rectifier (TR) and thyristor power controller (TPC) in the system, and the linear consumer (h) itself is not a harmonic source
Considering the contributions relative to I harmonic filter (HF) (h), in Figure 12c, it is shown that TR is a dominant source of harmonic currents, when current that flows through the power supply system (PSS) causes a negative contribution of about −55%
Summary
The uses of nonlinear loads are rapidly increased at the different types of industrial enterprises. In [29], the sharing of responsibilities for the generation of harmonic currents between PSS and consumers is performed by projecting the normalized vectors of current and voltage at the PCC on their vector sum for each harmonic separately The disadvantage of this method is the presence of an inductive load in the consumption side, which increases their contribution to the deterioration of the electric power quality at the PCC, which leads to a biased assessment of the consumers’ contribution.
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