Computation of Nonlinear Load Harmonic Currents in the Presence of External Distortions

Skamyin, Aleksandr; Belsky, A. A.; Dobush, V. S.; Gurevich, Ilya

doi:10.3390/computation10030041

Cited by 9 publications

(8 citation statements)

References 43 publications

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“…In this case, the measurement of the harmonic currents I 1h and I 2h corresponds to a certain error of the currents I 01h and I 02h . An estimation of such an error is given in [38,39] and is insignificant due to the fact that the harmonic impedance of the filter at the h th harmonic frequency is significantly less than the harmonic impedance of Load 1 and Load 2 of the consumer at the same frequency. Then harmonic currents I 1h and I 2h flow through the supply feeder circuit and the passive filter circuit at the h th harmonic frequency.…”

Section: Methods For Determination the Share Contribution Of Harmonic...mentioning

confidence: 99%

Influence of Background Voltage Distortion on Operation of Passive Harmonic Compensation Devices

Skamyin,

Shklyarskiy,

Gurevich

2024

Energies

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This paper discusses the issues of assessing the influence of external distortion sources on the functioning of a shunt passive harmonic filter. In this study, we evaluated the overload of a passive harmonic filter based on determining the contributions of distortion sources. A method was proposed for assessing the contributions of distortion sources, which allowed us, regardless of background distortions, to determine the contributions of consumer loads, as well as the contribution of background distortions. The simulation was carried out using the Simulink MatLab software (version R2023a). Several scenarios were considered in which the following values were varied: supply feeder impedance, level of background distortions, consumer electrical load composition, and passive filter parameters. It was found that the contribution of the background distortion source decreases with increasing impedance of the supply grid. It was determined that the consumer load contribution is independent of background voltage harmonics and can be used to estimate the overload of a passive harmonic filter. It was shown that it is necessary to take into account the overload of the passive filter by currents from background distortion sources, which did not exceed 135% of the rated rms current for the conditions under consideration. A mathematical model was proposed to estimate the overload of a passive filter in the presence of background voltage distortions. This model was obtained during analytical studies and allows one to evaluate the overload of a passive filter, taking into account the short circuit ratio, detuning frequency and power of the passive filter, and the share contribution of background distortion sources.

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Section: Methods For Determination the Share Contribution Of Harmonic...mentioning

confidence: 99%

Influence of Background Voltage Distortion on Operation of Passive Harmonic Compensation Devices

Skamyin,

Shklyarskiy,

Gurevich

2024

Energies

Self Cite

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“…Such a phenomenon will degrade the original converted signal and lead to SFDR. That is, in IEEE Standard 1241, SFDR is the ratio of discrete fourier transform (DFT) regenerated digital signal amplitude to the largest harmonic (spurious) component observed over the full Nyquist band [19], [22], [23].…”

Section: (N) = X(t) + Ementioning

confidence: 99%

“…Yet, as the fourier transform is based on the summation series of sine and cosine waveforms, characteristics of spectral impurity such as noise, harmonics, and frequency drifts may add and affect the digitizer testing output integrity [19]. As fourier transform articulates signals in the frequency domain, there will be no time representations in such an algorithm [19], [23]- [26].…”

Section: Numerical Relay Operation and Testingmentioning

confidence: 99%

Modeling of power numerical relay digitizer harmonic testing in Wavelet transform

Awada

Radwan

Nour³

et al. 2023

Bulletin EEI

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In today’s modern power devices and rapid growth power demands, the need for precise and accurate protection relays is a must for the power distribution system. That is, to segregate faulty sectors within fewer cycles, power relays should perform at the highest level of accuracy to detect abnormal conditions in power distribution. Therefore, this work will investigate the enhancement of the numerical relay testing in terms of harmonic distortions effect on the digitized output waveform as direct causes of relay failures. However, as it is an expensive process of testing the digitizing element of the numerical relay, this paper proposes a new algorithm of Wavelet transforms in power quality signal processing testing using MATLAB simulation. As this newly proposed method of advanced waveform analysis algorithm will enhance the testing process of digitizing elements, and reduce data compiling complexity, a comparison between conventional Fourier Transforms testing and Wavelet algorithm under abnormal conditions will be simulated based on inserting multi harmonics effect. As a result, based on the Wavelet bank of filters, de-noising, and decomposition structure filters, Wavelet has provided promising results in defining the effect of waveform distortion tripping time, fault location, total harmonic distortion, signal-to-noise ratio, and spurious-free dynamic range.

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“…i.e., the provision of Reactive demand to the local load. Instead of Reactive demand being fed from the centralized source, the reactive demand is fed local by two ways: Passive Source-capacitor banks [12] tied before the reactive load center or by active equipment consisting of SVC [13], IVR [14], Synchronous Generators. Passive topologies are manually operated, while active ones automatically regulate their reactive power injection, so as to optimize their input to VR.…”

Section: Conventional Voltage Regulation Techniquementioning

confidence: 99%

Ancillary Service of Voltage Support for a Weak Medium Voltage Grid through Injected Distributed Generation

Haider¹,

Yousuf²,

Idrees³

et al. 2022

Preprint

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Voltage Stability & Control, is very crucial compared to other Power System (PS) Quality and Stability issues. Long-Vertical-Power-Flows in Conventional Grids, causes voltage drops which in turn causes huge power losses, especially in the Medium Voltage (MV) and Low Voltage (LV) Distribution Networks. Such technical losses in abysmally-planned weak distribution networks, lead to substantial loss of revenues to the utility grid. Apart from classic Voltage Regulation (VR) techniques, with the rise of Distributed Generation (DG) based on Renewable Energy Sources (RES), Horizontal-Power-Flows can be introduced in the network, through various Smart Grid techniques. Coupling such sources, near load centers shall mitigate long flows from expensive conventional sources at times of huge demands, improving feeders’ Voltage Profile. This Ancillary Service of Voltage Support from DG RESs shall thereby alleviate revenue losses caused by long-power-flows in weak distribution grids. For a developing country like Pakistan, loss of revenue from an already expensive utility gives huge blow to the economy. So, a similar technique for voltage support is proposed for an 11-kV feeder, which faces similar problem, and the results are remarkable. The technique is implemented using OpenDSS Tool by modelling 3MWp PV Penetration along with some future storage.

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Computation of Nonlinear Load Harmonic Currents in the Presence of External Distortions

Cited by 9 publications

References 43 publications

Influence of Background Voltage Distortion on Operation of Passive Harmonic Compensation Devices

Influence of Background Voltage Distortion on Operation of Passive Harmonic Compensation Devices

Modeling of power numerical relay digitizer harmonic testing in Wavelet transform

Ancillary Service of Voltage Support for a Weak Medium Voltage Grid through Injected Distributed Generation

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