Extension of the CPC power theory to four-wire power systems with non-sinusoidal and unbalanced voltages

Škrbić, Bojana; Mikulović, Jovan; Šekara, Tomislav B.

doi:10.1016/j.ijepes.2018.08.032

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…On the other hand, the signals change to a nonlinear profile, and there is always a valid concern about harmonic distortion. This issue has received more attention in recent years with the extensive use of electronic devices with nonlinear elements, in other words, with the ever increasing number of power electronic devices connected to power systems [2][3][4]. This leads to a power quality-PQ-problem due to the harmonics injection in the power network by this equipment [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Electrical Quantities Measured by Revenue Meters Under Different Voltage Distortions and the Influences on the Electrical Energy Billing

et al. 2019

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This paper evaluates the impact of voltage distortion on the electrical quantities measured by revenue meters and the influences on the electrical energy billing. This is done through an experimental setup, which combines the following variables for the first time in an experiment: different total harmonic voltage distortion (THDv) levels; among these levels, different harmonic profiles; and different loads. A programmable alternating current (AC) power source was used in the laboratory to apply voltage signals in three electronic loads: a compact fluorescent lamp (CFL) and two light emitting diode (LED) lighting devices for which voltage signals with THDv 4.9%, 18.8% and 24.5% have been applied. All applied signals contain one or more harmonic order more commonly found in the low voltage grid (3rd, 5th and 7th). For these analyses, a power quality analyzer and a revenue meter were used. The results show that significant and diverse effects on the electrical quantities of individual loads will occur with different THDv levels and harmonic profiles. Comparing with a reference case (sinusoidal condition), when a distorted signal was applied, for the same THDv level, some parameters remained numerically the same, some have improved and some have become worse. This study shows that the effects of combination of the variables such as different THDv level with different harmonic profiles on electrical quantities of loads are not as clear as the effects of considering only one variable. The results of this paper shed light on such effects.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Electrical Quantities Measured by Revenue Meters Under Different Voltage Distortions and the Influences on the Electrical Energy Billing

et al. 2019

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“…By the comparison with other results obtained before, the results of this new technique are better to reduce losses and improve the PQ characteristics in distribution network level. With a same way, In [3] a modification has been done for the CPC power theory to four-wire unbalanced power, for objective to gives the smallest possible line losses in the same transferred of the active power to the load in non symmetrical and unbalanced distribute voltage. For this reason a load flow is an important analysis tool to improve the PQ [4].…”

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confidence: 99%

Unbalanced Load Flow With Hybrid Wavelet Transform and Support Vector Machine Based Error-Correcting Output Codes for Power Quality Disturbances Classification Including Wind Energy

Rahmani

Slimani

Bouktir

2019

Elektroteh. elektromeh.

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Purpose. The most common methods to design a multiclass classification consist to determine a set of binary classifiers and to combine them. In this paper support vector machine with Error-Correcting Output Codes (ECOC-SVM) classifier is proposed to classify and characterize the power quality disturbances such as harmonic distortion, voltage sag, and voltage swell include wind farms generator in power transmission systems. Firstly three phases unbalanced load flow analysis is executed to calculate difference electric network characteristics, levels of voltage, active and reactive power. After, discrete wavelet transform is combined with the probabilistic ECOC-SVM model to construct the classifier. Finally, the ECOC-SVM classifies and identifies the disturbance type according to the energy deviation of the discrete wavelet transform. The proposed method gives satisfactory accuracy with 99.2% compared with well known methods and shows that each power quality disturbances has specific deviations from the pure sinusoidal waveform, this is good at recognizing and specifies the type of disturbance generated from the wind power generator. References 22, tables 8, figures 9. Key words: unbalanced load flow, wavelet transform (WT), support vector machines (SVM), power quality disturbance, wavelet energy. ECOC-SVM для построения классификатора. Наконец, ECOC-SVM классифицирует и идентифицирует тип возмущения в соответствии с отклонением энергии дискретного вейвлет-преобразования. Предложенный метод дает удовлетворительную точность 99,2% по сравнению с хорошо известными методами и показывает, что каждое нарушение качества электроэнергии имеет определенные отклонения от чисто синусоидальной формы волны, что способствует распознаванию и определению типа возмущения, генерируемого ветровым генератором. Библ. 22, табл. 8, рис. 9. Ключевые слова: несбалансированный поток нагрузки, вейвлет-преобразование (WT), машины опорных векторов (SVM), нарушение качества электроэнергии, энергия вейвлета. Цель. Наиболее распространенные методы построения мультиклассовой классификации заключаются в определении набора двоичных классификаторов и их объединении. В данной статье предложена машина опорных векторов с классификатором выходных кодов исправления ошибок (ECOC-SVM) с целью классифицировать и характеризовать такие нарушения качества электроэнергии, как гармонические искажения, падение напряжения и скачок напряжения, включая генератор ветровых электростанций в системах передачи электроэнергии. Сначала выполняется анализ потока несимметричной нагрузки трех фаз для расчета разностных характеристик электрической сети, уровней напряжения, активной и реактивной мощности. После этого дискретное вейвлетпреобразование объединяется с вероятностной модельюHow to cite this article: Rahmani A., Slimani L., Bouktir T. Unbalanced load flow with hybrid wavelet transform and support vector machine based error-correcting output codes for power quality disturbances classification including wind energy.

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“…In terms of an AV or AC signal in a system, the sinusoidal waveform signal was normally considered as the most common interference form due to the fact that the sinusoidal AC source is widely employed to power the equipment in most domestic and industrial fields. 7,8 As a matter of fact, it is highly possible that the AV signals exist in the form of other potential waveforms in a circuit system, such as triangular and square waves, or even the superposition of several waveforms. Apart from the sinusoidal part of an AV or AC interference, the triangular and squarewave AV signals are generated randomly from the superposition and oscillation of signal sources in a power-supply system.…”

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confidence: 99%

Distinction in Corrosion Behaviors of Duplex Stainless Steel 2205 Induced by Different Waveform Alternating Voltages Interference

Dai

Jun

Sun

et al. 2019

J. Electrochem. Soc.

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Anisotropic corrosion behaviors of duplex stainless steel induced by different waveform alternating voltage (AV) interferences have never been elucidated. The results of FeCl 3 pitting immersion tests reveal that the critical pitting temperature (CPT) of 2205 samples is decreased with the interferences of three waveform AV signals. For the AV with equal root mean square (RMS) value on electrode samples, the triangular wave induces much stronger etching on DSS 2205 than the sinusoidal and square ones. However, the sinusoidal and triangular AV interferences trigger the most severe pitting corrosion in high-temperature solution (>50°C). The weight loss induced by pitting corrosion is greater than that by strong etching on samples. Regarding the etching behavior, the austenite in the duplex phase exhibits an inferior corrosion resistance and is preferentially dissolved.

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Extension of the CPC power theory to four-wire power systems with non-sinusoidal and unbalanced voltages

Cited by 8 publications

References 19 publications

Analysis of the Electrical Quantities Measured by Revenue Meters Under Different Voltage Distortions and the Influences on the Electrical Energy Billing

Analysis of the Electrical Quantities Measured by Revenue Meters Under Different Voltage Distortions and the Influences on the Electrical Energy Billing

Unbalanced Load Flow With Hybrid Wavelet Transform and Support Vector Machine Based Error-Correcting Output Codes for Power Quality Disturbances Classification Including Wind Energy

Distinction in Corrosion Behaviors of Duplex Stainless Steel 2205 Induced by Different Waveform Alternating Voltages Interference

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