The effect of net harmonic currents produced by numbers of the Sydney Olympic Village's PV systems on the power quality of local electrical network

2021 ◽

Vol 10 (4) ◽

pp. 2803-2809

Keyword(s):

Power Systems ◽

Power Quality ◽

Distribution System ◽

Supply Voltage ◽

Voltage Sag ◽

Harmonic Currents ◽

Power Quality Improvement ◽

Power Quality Disturbances ◽

Quality Of Electric Power

Power quality has become an important factor in power systems, for consumer and household appliances with proliferation of various electric/ electronic equipment and computer systems. The main causes of a poor power quality are harmonic currents, poor power factor, supply voltage variations, etc. In recent years the demand for the quality of electric power has been increased rapidly. Power quality problems have received a great attention nowadays because of their impacts on both utilities and customers. Voltage sag, swell, momentary interruption, under voltages, over voltages, noise and harmonics are the most common power quality disturbances.It proposes a new connection for a unified power quality compensator (UPQC) to improve the power quality of two feeders in a distribution system. It illustrates how UPQC can improve the power quality by mitigating all these PQ disturbances. The proposed configuration of the UPQC is developed and verified for various power quality disturbances by simulating the mode using MATLAB.

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Impact of Harmonic Currents of Nonlinear Loads on Power Quality of a Low Voltage Network–Review and Case Study

Energies ◽

10.3390/en14123665 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3665

Author(s):

Łukasz Michalec ◽

Michał Jasiński ◽

Tomasz Sikorski ◽

Zbigniew Leonowicz ◽

Łukasz Jasiński ◽

...

Keyword(s):

Power Quality ◽

Low Voltage ◽

Harmonic Distortion ◽

Experimental Tests ◽

Total Harmonic Distortion ◽

Quality Analysis ◽

Nonlinear Loads ◽

Distortion Factor ◽

Harmonic Currents

The paper presents a power-quality analysis in the utility low-voltage network focusing on harmonic currents’ pollution. Usually, to forecast the modern electrical and electronic devices’ contribution to increasing the current total harmonic distortion factor (THDI) and exceeding the regulation limit, analyses based on tests and models of individual devices are conducted. In this article, a composite approach was applied. The performance of harmonic currents produced by sets of devices commonly used in commercial and residential facilities’ nonlinear loads was investigated. The measurements were conducted with the class A PQ analyzer (FLUKE 435) and dedicated to the specialized PC software. The experimental tests show that the harmonic currents produced by multiple types of nonlinear loads tend to reduce the current total harmonic distortion factor (THDI). The changes of harmonic content caused by summation and/or cancellation effects in total current drawn from the grid by nonlinear loads should be a key factor in harmonic currents’ pollution study. Proper forecasting of the level of harmonic currents injected into the utility grid helps to maintain the quality of electricity at an appropriate level and reduce active power losses, which have a direct impact on the price of electricity generation.

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Power Quality Improvement of Isolated Power System Network using UPQC

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.e6209.018520 ◽

2020 ◽

Vol 8 (5) ◽

pp. 1962-1969

Keyword(s):

Quality Improvement ◽

Power System ◽

Power Quality ◽

Reactive Power ◽

Harmonic Distortion ◽

Unit Vector ◽

Electrical Network ◽

Alphabetical Order ◽

Power Quality Improvement

The Unified Power Quality Controller (UPQC) is the Custom Power device designed for improving the power quality of the electrical network. In this paper, we proposed UPQC design for an isolated power system network to attend both voltage and current distortion by using Unit Vector template algorithm and Instantaneous Reactive Power theory. Also UPQC is designed for the hybrid generation with Hysteresis control algorithm. The power quality improvement of the power system network is the main aim . The performance analysis is done by comparing its Total Harmonic Distortion (THD). Based on its THD the quality of the power at the “Point of common coupling (PCC)”with and without compensator is quantified in this paper. Keywords : About four key words or phrases in alphabetical order, separated by commas.

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Design and Analysis of Controller with Selective Harmonic Compensator for Grid Connected PV System

E3S Web of Conferences ◽

10.1051/e3sconf/202130901009 ◽

2021 ◽

Vol 309 ◽

pp. 01009

Author(s):

M. Vasu ◽

D. Lenine ◽

J. Surya Kumari ◽

T. Suresh Kumar

Keyword(s):

Power Quality ◽

Pv System ◽

Pv Systems ◽

Distributed Power Generation ◽

Quality Issue ◽

Pv Inverter ◽

Current Controller ◽

Simulation Results ◽

Power Generation Systems

Harmonics produced by distributed power generation systems (DPGS) is a main power quality issue, particularly due to the number of these systems connected to the grid is always increasing. This means that, it is significant to control the harmonics caused by these inverters to limit their contrary effects on the grid power quality. This paper has proposed a new proportional current controller (P Resonant Current Controller) with selective harmonic compensator for grid connected photovoltaic (PV) systems. The proportional resonant current controller (PRCC) can have a significant effect on the quality of the current supplied to the grid by the PV inverter, and hence it is essential that the controller provides a high-quality sinusoidal output with negligible distortion to avoid generating harmonics. The effectiveness of the proposed framework has been verified using simulation results in MATLAB/Simulink.

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Power quality assurance in the electrical network of the Syrian Arab Republic, using the active power filter

Proceedings of the higher educational institutions ENERGY SECTOR PROBLEMS ◽

10.30724/1998-9903-2020-22-1-18-27 ◽

2020 ◽

Vol 22 (1) ◽

pp. 18-27

Author(s):

R. R. Nasyrov ◽

R. Aljendy ◽

T. Kherbek

Keyword(s):

Power Quality ◽

Electromagnetic Interference ◽

Harmonic Distortion ◽

Electrical Equipment ◽

Active Power ◽

Electrical Network ◽

Syrian Arab Republic ◽

Particle Swarm Method ◽

The Impact

The set of characteristics that determine the power quality (PQ) can be used to describe the state and efficiency of the power supply system in terms of the influence of electromagnetic interference. The impact of electromagnetic interference on electrical equipment is manifested in the reduction of uptime, additional losses of active power, data loss, etc. The most common sources of interference in modern conditions are consumers with non-linear volt-ampere characteristics. This type of electrical receivers creates a distortion of the current and voltage waveform. In view of the widespread use of these power consumers in daily life and industry, special attention should be paid to the problems of harmonic distortion. This article presents the results of measurements and analysis of the quality of electricity, and also shows the effect of applying an active filter (AF) to ensure the quality of electricity in the distribution network (66/20 kV) of the city of Lattakia in the Syrian Arab Republic. The definition of the optimal capacitance of the AF dc link using the particle swarm method is given in order to minimize the total non- sinusoidal current and voltage in the studied electrical network.

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