Measurement system for harmonic impedance of the network and validation steps

Moreau, G.; Le, Hu; Croteau, G.; Beaulieu, G.; Portales, Esteban

doi:10.1109/qsepds.2003.159798

Cited by 9 publications

(9 citation statements)

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“…Methods like active harmonic power flow direction [4], [5] and online impedance measurements [6], [7] have been proposed to offer a solution to the problem. However most methods assume a radial feeder supplying a single load through a known feeder impedance, or multiple loads connected to a PCC which has a sinusoidal voltage and with zero impedance in the supply feeder.…”

Section: Harmonic Current Determinationmentioning

confidence: 99%

Monitoring the true harmonic current of a variable speed drive under nonsinusoidal supply conditions

Mazumdar

Harley

Lambert

et al. 2006

2006 37th IEEE Power Electronics Specialists Conference

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The increased use of nonlinear devices in industry has resulted in direct increase of harmonic distortion in the industrial power system. Variable speed drives are an example. With the widespread proliferation of nonlinear loads in a power distribution network, the voltage at the point of common coupling is rarely a pure sinusoid. It has become necessary to identify accurately which load(s) is injecting the excessively high harmonic currents. Simply measuring the harmonic currents at each individual load is not sufficiently accurate since these harmonic currents may be caused by not only the nonlinear load, but also by a non-sinusoidal PCC voltage. This paper proposes a neural network solution methodology for the problem of measuring the actual amount of harmonic current injected into a power network by a three phase variable speed drive, and this technique can be extended to any nonlinear load in general. The proposed method has been experimentally verified by applying the scheme to a commercially available variable speed drive. The scheme has been applied to each phase individually as well as to all three phases together. The goal of this paper is to quantify the difference in current distortion of a load when supplied from a distorted source as compared to a clean sine wave. A Multilayer Perceptron Neural Network is used to estimate the true harmonic current distortion of a load. Theory and practical results are presented. This technology could be integrated into any commercially available power quality instrument or be fabricated as a standalone instrument.I.

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Section: Harmonic Current Determinationmentioning

confidence: 99%

Monitoring the true harmonic current of a variable speed drive under nonsinusoidal supply conditions

Mazumdar

Harley

Lambert

et al. 2006

2006 37th IEEE Power Electronics Specialists Conference

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“…In the literature, there is a noted use of capacitor switching in studies that involve power quality for determining harmonic impedances of electric systems. [21][22][23][24][25][26][27] The originality of the proposed study is in the development of a theory capable of determining the harmonic responsibility percentages of the parties involved in the sharing process, without the need to pass through the harmonic impedance estimation step. This is possible by only measuring the harmonic voltages and currents at the point of interest, before and after performing the switching of a capacitor.…”

Section: Introductionmentioning

confidence: 99%

Capacitor switching methodology for responsibility sharing of harmonic voltage distortions

Santos

Oliveira

2019

Int Trans Electr Energ Syst

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Summary In the context of the electric power quality, there is not a definitive consensus about the theme sharing of responsibility concerning harmonic distortions. This paper presents a new methodological proposal, based on capacitors switching, which contributes effectively to the scientific breakthroughs needed to close this challenging issue. Following a discussion of the physical concepts that make up the basis of the method, its performance is investigated through two case studies. At first, the tests for the application of the proposed procedure were performed by means of computer simulations, which involved a large‐scale electric system. After this step, laboratory tests were carried out in a setup that maintained a structure very close to that simulated, however, on a reduced scale. In both situations, the results found indicated the consistency of the proposed method, which, due to its robustness and simplicity, has great potential in terms of its application to power systems.

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“…The invasive methods on the other hand provide a better accuracy and a controllable frequency range (e.g. [10]- [12]). They use an external setup to generate the excitation current and to carry out the measurements.…”

Section: Introductionmentioning

confidence: 99%

Impact of Modern Electronic Equipment on the Assessment of Network Harmonic Impedance

Chakravorty

Meyer

Schegner

et al. 2017

IEEE Trans. Smart Grid

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Abstract--Network harmonic impedance forms the link between harmonic currents emitted by individual devices and the harmonic voltage levels in the grid. It is essential for the definition of current emission limits in order to ensure Electromagnetic Compatibility between all equipment connected to the grid. Among all electrical equipment in future smart grid electronic devices, like PV inverters, EV chargers or lamps with electronic ballast, will have a dominating share. This is expected to have a considerable impact on the network harmonic impedance characteristic.The paper discusses the frequency-dependent input impedance of different types of modern electronic equipment and its potential impact on the network harmonic impedance. It is shown that the semiconductor switching results in a variation of the impedance within the fundamental cycle. This is not considered by the presently used assessment methods as they assume only passive network elements. Beside a method to measure these variations, several indices are introduced to quantify the level of its impact. The paper aims to provide some impulses for further discussions, particularly about the definition of network harmonic impedance in presence of electronic devices, the necessity to include these variations in realistic harmonic studies and if this has to be considered in the standardization.

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Measurement system for harmonic impedance of the network and validation steps

Cited by 9 publications

References 0 publications

Monitoring the true harmonic current of a variable speed drive under nonsinusoidal supply conditions

Monitoring the true harmonic current of a variable speed drive under nonsinusoidal supply conditions

Capacitor switching methodology for responsibility sharing of harmonic voltage distortions

Impact of Modern Electronic Equipment on the Assessment of Network Harmonic Impedance

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