Considerations on Current and Voltage Unbalance of Nonlinear Loads in Residential and Educational Sectors

Popa, Gabriel Nicolae; Iagăr, Angela; Diniş, Corina Maria

doi:10.3390/en14010102

Cited by 14 publications

(9 citation statements)

References 44 publications

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“…Electromagnetic disturbances that occur in the operation of energy systems affect practically all the characteristics of the voltage and current waves: frequency, shape, amplitude, and symmetry (in the case of three-phase systems) [4,15,[37][38][39].…”

Section: Power Quality Issuesmentioning

confidence: 99%

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Aspects Regarding of Passive Filters Sustainability for Non-Linear Single-Phase Consumers

Diniș,

Popa,

Cunțan

et al. 2024

Sustainability

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The efficient use of electrical energy (an important component of sustainability) has become increasingly important for electrical consumers (industrial and non-industrial) as we face the challenges of climate change and the need to protect the environment. This theme is essential for guaranteeing a secure and sustainable future for both present and future generations. The power quality and the efficiency of electrical energy are connected to each other. Some power quality problems are caused by natural and unpredictable events, but many disturbances affecting power quality are caused by suppliers and consumers. One of the most important parameters in power engineering is the power factor, which indicates the degree of efficient use of electrical energy. Harmonics is the most important dynamic component of power quality, which affects the operation of electrical equipment and, at the same time, reduces the power factor. Harmonic sources in power systems are generally associated with nonlinear loads. To analyze the operating of passive filters (series L, shunt LC, T type LCL), two groups of experiments (relevant consumers were chosen for the industry as well as from the household sector) were carried out with single-phase nonlinear consumers: in the first group of experiments, a variable-frequency drive is used to supply a three-phase induction motor with variable load; in the second group of experiments, compact fluorescent lamps and LED lamps were used. Following the experiments, it was found that the difficulty of calibrating coils (to size a filter), especially the coils with a core, and the change in electrical properties over time for capacitors. For a certain type of consumer, the improvement of the current waveform depends on the type of filter used, the possibility of improving the power factor (to use electrical energy efficiently), and the role of the source impedance, which is particularly important to improve the efficiency of passive filters. Through the appropriate choice of the passive filter, a decrease in the deforming regime is obtained, with a slight decrease in the active power, and by increasing the power factor, a decrease in the losses of electrical energy from the electrical networks is obtained, with direct implications for the emission of greenhouse gases.

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Section: Power Quality Issuesmentioning

confidence: 99%

“…When operating in periodic non-sinusoidal mode (non-sinusoidal voltages and/or currents), the following powers can be defined [12,13,15,37]:…”

Section: Power Quality Issuesmentioning

confidence: 99%

Aspects Regarding of Passive Filters Sustainability for Non-Linear Single-Phase Consumers

Diniș,

Popa,

Cunțan

et al. 2024

Sustainability

Self Cite

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“…Electrical power demand is exponentially growing due to more urbanization, commercialization and industrial development. This exponential growth in demand poses operational challenges in power utilities [1][2][3]. The current infrastructure is insufficient to support such immense power demand.…”

Section: Introductionmentioning

confidence: 99%

SPSO Based Optimal Integration of DGs in Local Distribution Systems under Extreme Load Growth for Smart Cities

et al. 2021

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Renewable energy-based distributed generators (DGs) are gaining more penetration in modern grids to meet the growing demand for electrical energy. The anticipated techno-economic benefits of these eco-friendly resources require their judicious and properly sized allocation in distribution networks (DNs). The preeminent objective of this research is to determine the sizing and optimal placing of DGs in the condensed DN of a smart city. The placing and sizing problem is modeled as an optimization problem to reduce the distribution loss without violating the technical constraints. The formulated model is solved for a radial distribution system with a non-uniformly distributed load utilizing the selective particle swarm optimization (SPSO) algorithm. The intended technique decreases the power loss and perfects the voltage profile at the system’s nodes. MATLAB is used for the simulation, and the obtained results are also validated by the Electrical Transient Analysis Program (ETAP). Results show that placing optimally sized DGs at optimal system nodes offers a considerable decline in power loss with an improved voltage profile at the network’s nodes. Distribution system operators can utilize the proposed technique to realize the reliable operation of overloaded urban networks.

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“…The proposed method uses the voltages and currents consumed by individual consumers recorded in real conditions. The publication [2] presents the assessment of the influence of single-phase electric consumers on voltage asymmetry.…”

Section: Introductionmentioning

confidence: 99%

Electric Arc Furnaces as a Cause of Current and Voltage Asymmetry

Olczykowski

2021

Energies

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In the case of three-phase arc furnaces, two types of asymmetry can be distinguished: constructional and operational. The structural asymmetry is related to the construction of high-current circuits supplying the arc furnace. The knowledge of the parameters of the high-current circuit allows to determine the operating characteristics of the arc device. The author proposed a method for calculating the real values of the resistance and reactance of the high-current circuit. For this purpose, tests were made to short-circuit the electrodes with the charge. During the short-circuit, with the use of a power quality analyzer, measurements of electrical indicators were carried out, which allow to determine the parameters of the high-current circuit. A new method for determining voltage operational unbalance is also presented in this paper. The theoretical considerations presented in the article were verified in industrial conditions.

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Considerations on Current and Voltage Unbalance of Nonlinear Loads in Residential and Educational Sectors

Cited by 14 publications

References 44 publications

Aspects Regarding of Passive Filters Sustainability for Non-Linear Single-Phase Consumers

Aspects Regarding of Passive Filters Sustainability for Non-Linear Single-Phase Consumers

SPSO Based Optimal Integration of DGs in Local Distribution Systems under Extreme Load Growth for Smart Cities

Electric Arc Furnaces as a Cause of Current and Voltage Asymmetry

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