scholarly journals Impact of Harmonics on Power Quality and Losses in Power Distribution Systems

2015 ◽  
Vol 5 (1) ◽  
pp. 166 ◽  
Author(s):  
M. Jawad Ghorbani ◽  
Hossein Mokhtari
Keyword(s):  
Power Quality ◽  
Power Distribution ◽  
Distribution Systems ◽  
Harmonic Distortion ◽  
Equivalent Model ◽  
Power Distribution Systems ◽  
Nonlinear Loads ◽  
Distribution Feeder ◽  
The Impact

This paper investigates the harmonic distortion and losses in power distribution systems due to the dramatic increase of nonlinear loads. This paper tries to determine the amount of the harmonics generated by nonlinear loads in residential, commercial and office loads in distribution feeders and estimates the energy losses due to these harmonics. Norton equivalent modeling technique has been used to model the nonlinear loads. The presented harmonic Norton equivalent models of the end user appliances are accurately obtained based on the experimental data taken from the laboratory measurements. A 20 kV/400V distribution feeder is simulated to analyze the impact of nonlinear loads on feeder harmonic distortion level and losses. The model follows a “bottom-up” approach, starting from end users appliances Norton equivalent model and then modeling residential, commercial and office loads. Two new indices are introduced by the authors to quantize the effect of each nonlinear appliance on the power quality of a distribution feeder and loads are ranked based on these new defined indices. The simulation results show that harmonic distortion in distribution systems can increase power losses up to 20%.

Power Quality Enhancement Using a Novel Hybrid Active Power Filter Device Under Nonlinear Loads

2012 ◽  
Vol 516-517 ◽  
pp. 1419-1424
Author(s):  
Wei Jun Yun ◽  
Gang Yao ◽  
Li Dan Zhou ◽  
Chen Chen ◽  
Jun Min Pan
Keyword(s):  
Power Quality ◽  
Power Distribution ◽  
Distribution Systems ◽  
Active Power Filter ◽  
Active Power ◽  
Power Distribution Systems ◽  
Nonlinear Loads ◽  
Power Filter ◽  
Hybrid Active Power Filter

Nonlinear loads generate a large amount of characteristic harmonics , deteriorate the power quality of power distribution systems in Advanced manufacturing enterprises. In this paper a novel hybrid active power filter is proposed which consists of a series thyristor switched filter (TSF) and small rated shunt active power filter(APF). TSF is tuned at fifth and seventh order harmonic frequencies. Consequently APF compensates for third and other order harmonics, unbalance current and reactive power. A new control method based on PHC strategy is presented for APF. The device has already got an application in one of the transformer substations of a automobile factory. It’s revealed that the proposed device can improve the power factor , reduce the harmonics injection and enhancement power quality of the power distribution systems.

scholarly journals Optimal Selection of Metering Points for Power Quality Measurements in Distribution System

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1202
Author(s):  
Krzysztof Piatek ◽  
Andrzej Firlit ◽  
Krzysztof Chmielowiec ◽  
Mateusz Dutka ◽  
Szymon Barczentewicz ◽  
...  
Keyword(s):  
State Estimation ◽  
Power Quality ◽  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Optimal Selection ◽  
Power Distribution Systems ◽  
Observability Analysis ◽  
Selection Of

Quality of power supply in power distribution systems requires continuous measurement using power quality analyzers installed in the grid. The paper reviews the published methods for optimal location of metering points in distribution systems in the context of power quality metering and assessment. Three methods have been selected for detailed analysis and comparative tests. It has been found that utilization of the methods is possible, but their performance varies highly depending on the test grid’s topology. Since the methods rely on the state estimation approach, their performance is strictly related to observability analysis. It has been found that standard observability analysis used for typical state estimation problem yields ambiguous results when applied to power quality assessment. Inherited properties of the selected methods are also analyzed, which allows for the formulation of general recommendations about optimal selection of metering points in a distribution system.

scholarly journals Harmonics in commercial building power systems

2021 ◽  
Author(s):  
Abdel H Charty
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Power Distribution ◽  
Distribution Systems ◽  
Commercial Buildings ◽  
Power Distribution Systems ◽  
Commercial Building ◽  
Nonlinear Loads ◽  
Large Computer ◽  
Electrical Systems

Harmonics are increasingly becoming a major source of power quality problems in today's commercial power distribution systems. Although they have been present in power distribution systems since the early days of AC power systems, their level has dramatically increased and the effect on power distributions has been more and more noticeable in the last decade. This dramatic increase of harmonic levels is mainly due to the introduction of non linear loads such as personal computers, servers, variable frequency drives and UPS systems. Harmonic problems are especially common in commercial buildings housing large computer rooms where the concentration of nonlinear loads per square foot is very high, and continue to grow higher as the footprint of network and communication equipment becomes smaller. This report will provide a deep look at harmonics in power distribution systems in commercial buildings, their sources and the different ways by which they can affect electrical systems and power quality. Some of the solutions commonly used to deal with the problem of harmonics are reviewed, and a critical analysis of their effectiveness is provided. Computer simulations using Matlab Simulink have been developed to illustrate key points when possible.

The Power Quality Analysis and its Enhancement Scheme in Power Distribution of an Automobile Factory

2011 ◽  
Vol 354-355 ◽  
pp. 859-865
Author(s):  
Wei Jun Yun ◽  
Chen Chen ◽  
Jing Shuang Shen
Keyword(s):  
Power Quality ◽  
Automobile Industry ◽  
Power Distribution ◽  
Distribution Systems ◽  
Quality Analysis ◽  
Power Distribution Systems ◽  
Nonlinear Loads ◽  
Automobile Factory ◽  
Safety Operation ◽  
Power Electronic Technology

Nonlinear loads are widely spread in automobile industry along with the development of power electronic technology, which causes proliferation of power quality problems, such as harmonics, voltage fluctuation, etc. The problems result in detrimental effects to the power distribution systems, increasing power loss in the network and affecting the safety operation of electrical appliances. This paper analyzed the power quality problems and proposed an enhancement scheme implemented in an automobile factory. The scheme has already got an application in one of the transformer substations. It’s revealed that the proposed scheme can improve significantly the power factor of the 400V bus in car body workshop, and the harmonics injection to the utility grid can be within the limit of related standard．

scholarly journals Harmonics in commercial building power systems

2021 ◽  
Author(s):  
Abdel H Charty
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Power Distribution ◽  
Distribution Systems ◽  
Commercial Buildings ◽  
Power Distribution Systems ◽  
Commercial Building ◽  
Nonlinear Loads ◽  
Large Computer ◽  
Electrical Systems

Harmonics are increasingly becoming a major source of power quality problems in today's commercial power distribution systems. Although they have been present in power distribution systems since the early days of AC power systems, their level has dramatically increased and the effect on power distributions has been more and more noticeable in the last decade. This dramatic increase of harmonic levels is mainly due to the introduction of non linear loads such as personal computers, servers, variable frequency drives and UPS systems. Harmonic problems are especially common in commercial buildings housing large computer rooms where the concentration of nonlinear loads per square foot is very high, and continue to grow higher as the footprint of network and communication equipment becomes smaller. This report will provide a deep look at harmonics in power distribution systems in commercial buildings, their sources and the different ways by which they can affect electrical systems and power quality. Some of the solutions commonly used to deal with the problem of harmonics are reviewed, and a critical analysis of their effectiveness is provided. Computer simulations using Matlab Simulink have been developed to illustrate key points when possible.

scholarly journals Optimal Harmonic Mitigation in Distribution Systems with Inverter Based Distributed Generation

2021 ◽  
Vol 11 (2) ◽  
pp. 774 ◽  
Author(s):  
Ahmed S. Abbas ◽  
Ragab A. El-Sehiemy ◽  
Adel Abou El-Ela ◽  
Eman Salah Ali ◽  
Karar Mahmoud ◽  
...  
Keyword(s):  
Power Quality ◽  
Distributed Generation ◽  
Distribution System ◽  
Distribution Systems ◽  
Renewable Energy Sources ◽  
Harmonic Distortion ◽  
Planning Problem ◽  
Voltage Profile ◽  
Harmonic Mitigation ◽  
The Impact

In recent years, with the widespread use of non-linear loads power electronic devices associated with the penetration of various renewable energy sources, the distribution system is highly affected by harmonic distortion caused by these sources. Moreover, the inverter-based distributed generation units (DGs) (e.g., photovoltaic (PV) and wind turbine) that are integrated into the distribution systems, are considered as significant harmonic sources of severe harmful effects on the system power quality. To solve these issues, this paper proposes a harmonic mitigation method for improving the power quality problems in distribution systems. Specifically, the proposed optimal planning of the single tuned harmonic filters (STFs) in the presence of inverter-based DGs is developed by the recent Water Cycle Algorithm (WCA). The objectives of this planning problem aim to minimize the total harmonic distortion (THD), power loss, filter investment cost, and improvement of voltage profile considering different constraints to meet the IEEE 519 standard. Further, the impact of the inverter-based DGs on the system harmonics is studied. Two cases are considered to find the effect of the DGs harmonic spectrum on the system distortion and filter planning. The proposed method is tested on the IEEE 69-bus distribution system. The effectiveness of the proposed planning model is demonstrated where significant reductions in the harmonic distortion are accomplished.

Power Quality Issues and Solutions – Review

2015 ◽  
Vol 16 (4) ◽  
pp. 357-384 ◽  
Author(s):  
Suresh Mikkili ◽  
Anup Kumar Panda
Keyword(s):  
Power Quality ◽  
Power Distribution ◽  
Distribution Systems ◽  
Reactive Power ◽  
Electrical Power ◽  
Economic Loss ◽  
Nonlinear Loads ◽  
Broad Perspective ◽  
Three Phase ◽  
Quality Issues

Abstract Electrical power quality has been an important and growing problem because of the proliferation of nonlinear loads such as power electronic converters in typical power distribution systems in recent years. Particularly, voltage harmonics and power distribution equipment problems result from current harmonics produced by nonlinear loads. The Electronic equipment like, computers, battery chargers, electronic ballasts, variable frequency drives, and switch mode power supplies, generate perilous harmonics and cause enormous economic loss every year. Problems caused by power quality have great adverse economic impact on the utilities and customers. Due to that both power suppliers and power consumers are concerned about the power quality problems and compensation techniques. Power quality has become more and more serious with each passing day. As a result active power filter gains much more attention due to excellent harmonic and reactive power compensation in two-wire (single phase), three-wire (three-phase without neutral), and four-wire (three-phase with neutral) ac power networks with nonlinear loads. However, this is still a technology under development, and many new contributions and new control topologies have been reported in the last few years. It is aimed at providing a broad perspective on the status of APF technology to the researchers and application engineers dealing with power quality issues.

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