Summation of Supraharmonics in Neutral for Three-Phase Four-Wire System

Sutaria, Jil; Espín-Delgado, Ángela; Rönnberg, Sarah

doi:10.1109/ojia.2020.3026753

Cited by 8 publications

(8 citation statements)

References 13 publications

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“…Figure 7. geometric representation of Clark's Transformation [4] From this geometry, the following resolutions can be generated in terms of α and β frames [10]:…”

Section: Clark's Transformation (Abc To αβ0 Block)mentioning

confidence: 99%

“…Some of the noticeable and severe consequences of harmonics in power systems include core, hysteresis and eddy current losses which generate excessive heat in the windings of transformers and rotating machines leading to acute degradation of winding insulation, reduced dynamic torque, operating noise/mechanical vibration, and a consequent reduction in equipment lifetime [7], [8]. In a four-wire system, the existence of harmonics increases the zero-sequence component of current leading to a sharp increase in neutral conductor current [9], [10]. Harmonics can also increase line phase currents causing false operation of sensitive system components such as protective relays [11], [12].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of APF and STATCOM for Current Harmonic Mitigation

Galadima,

Mohamad Idris

2023

Elektrika

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The application of solid-state electronic devices has recorded a geometric increase in the last decade. Devices such as battery charging systems, inverters, switch mode power supplies and a host of electronic-based devices referred to as non-linear loads distort the source signal (particularly the current). Harmonics distortion imposes a severe impact on the well-being of the power system. They cause excessive device heating, reduced performance efficiency, early insulation failure, decreased dynamic torque in rotating systems, etc. This paper bases a study on Active Power Filter (APF) and Static Synchronous Compensator (STATCOM) for mitigation of these distortive harmonics in a system of 3-phase 11kV/400V, 400kVA feeding a system of non-linear loads. The study is based on the IEEE519 standard limits for current harmonics measured at the PCC. Therefore, the system short circuit ratio (SCR) is first determined. Using synchronous reference frame and instantaneous reactive power theories, the APF and STATCOM are respectively designed and run using MATLAB/Simulink software. The result analysis is obtained from the FFT signal processing toolbox of the software, and the device’s performances are evaluated based on the set standard. Results from the FFT spectra showed that the model system contains a considerable number of harmonics before filtering. However, when these devices are connected to the system, all higher-order harmonics have been minimized to the least fractions with respect to the standard, with STATCOM giving a comparatively better performance.

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“…Figure 7. geometric representation of Clark's Transformation [4] From this geometry, the following resolutions can be generated in terms of α and β frames [10]:…”

Section: Clark's Transformation (Abc To αβ0 Block)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of APF and STATCOM for Current Harmonic Mitigation

Galadima,

Mohamad Idris

2023

Elektrika

View full text Add to dashboard Cite

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“…Most combinations of multiple vehicles charging over one or two phases will result in a current flowing through the neutral conductor. Since EVs behave like a nonlinear load, generating harmonic distortion, the neutral conductor also consists of positive, negative, and zero sequence harmonic currents [53]. Higher order harmonics also affect the neutral current since they are superimposed on triple harmonics, adding the peak and RMS values [54].…”

Section: Site Characteristicsmentioning

confidence: 99%

Characterization of Supraharmonic Emission from Three Different Electric Vehicle Charging Infrastructures in Time and Frequency Domain

Streubel¹,

Kattmann²,

Eisenmann³

et al. 2022

Energies

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With the recent proliferation of electric vehicles (EVs), maintaining power quality within acceptable limits in future distribution grids will become a challenging task. A specific concern is the spread of Supraharmonics in the range from 2 to 150 kHz, generated by modern power electronic devices. In this paper, the long term Supraharmonic distortion from three differently sized electric vehicle charging infrastructures is analyzed in frequency and time domain. At the monitored sites several interruptions of EV charging processes were observed due to poor power quality. It was found that vehicles disconnect when exposed to high levels of harmonic distortion. Moreover, the impact of the charging EVs on the Supraharmonic distortion and the interaction with the background distortion for the individual sites is discussed. Results show that a general increase in Supraharmonics emission can be expected due to the rising number of EVs. However, measurements also indicate that damping effects can occur for certain load configurations.

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“…Methods were used according to IEC 61000-3-4 summation law and using complex phasors. Other recent works still deal with the theme of summation of waveform distortions also focused on problems such as supraharmonics [32,33]. Lastly, a study case [34] regarding a harmonic aggregation analysis in a Brazilian actual transmission system model was conducted using a similar approach of alternative summation laws proposed by this work.…”

Section: Introductionmentioning

confidence: 99%

Observations on Harmonics Summation in Transmission Systems: Alternative Aggregation Estimation

Salles

Silva

Ribeiro

2022

International Transactions on Electrical Energy Systems

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The aggregation of harmonic components from different sources is one of the critical and challenging assessments in electric power systems. Harmonic summation analysis and estimation is not a simple task since there will be variations because of the grid complexity, nonlinear sources, and unpredictable behaviour of harmonic currents that affect the results. An evaluation of harmonic summation using alternative methods to calculate the harmonic composition at any network point is suggested. A typical arrangement of transmission grids was modelled and used to simulate the results. This paper aims to highlight the results obtained by these alternative methods of harmonic summation and show the role of this type of analysis in transmission systems planning. The contributions are (a) illustrate how alternative methods of harmonic summation can be applied to investigate harmonic aggregation from different sources; (b) provide a case study that also discusses the harmonic aggregation effects with different locations of sources and component phase angle shifting; (c) show comparison and correlation between those alternative summations calculations with a standardized and firmly adopted method (proposed by IEC 61000-3-6). The software MATLAB/Simulink performs simulation and analysis. Finally, the work discusses the findings.

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Summation of Supraharmonics in Neutral for Three-Phase Four-Wire System

Cited by 8 publications

References 13 publications

Comparison of APF and STATCOM for Current Harmonic Mitigation

Comparison of APF and STATCOM for Current Harmonic Mitigation

Characterization of Supraharmonic Emission from Three Different Electric Vehicle Charging Infrastructures in Time and Frequency Domain

Observations on Harmonics Summation in Transmission Systems: Alternative Aggregation Estimation

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