scholarly journals A Survey on Harmonic Mitigation Techniques in Power System

2018 ◽  
Vol 7 (4.24) ◽  
pp. 695
Author(s):  
P. Abirami ◽  
Dr. C.N.Ravi
Keyword(s):  
Power System ◽  
Power Quality ◽  
Distribution Network ◽  
Electrical Equipment ◽  
Vital Role ◽  
Transformer Protection ◽  
Power Semiconductor ◽  
Measuring Devices ◽  
Mitigation Techniques ◽  
Harmonic Mitigation

In recent years, one of the most frightening criteria in power system is the generation of harmonics, due to the advancement in power semiconductor devices. Today most of the commercial, residential and industrial loads include advanced semiconductor technology and the utility of these non-linear loads results in harmonics generation on consumer’s premises. These harmonics plays a vital role in polluting the power quality of a distribution network by introducing losses which results in the failure of distribution side electrical equipment like transformer, protection, measuring devices, distribution feeders and so on. Hence to enhance the power quality, harmonic mitigation technique should be implemented in a distribution network. This paper surveys about the availability of various harmonic mitigation techniques with the analysis of its merits and demerits.    

Overview of Distribution Network Automation Technology

2013 ◽  
Vol 811 ◽  
pp. 631-634
Author(s):  
Xue Song Zhou ◽  
Zhao Hao Hou ◽  
You Jie Ma
Keyword(s):  
Power System ◽  
Electric Power ◽  
Distribution Network ◽  
Vital Role ◽  
Electric Power System ◽  
System Structure ◽  
Structure Development ◽  
Development Status ◽  
Speed Up ◽  
Automation Technology

This paper proposes a general overview of distribution network automation technology. With the continuous development of society and economy, the distribution network automation has become the trend and developing direction of electric power system. As the end part of the electric power system, the distribution network is directly connected to the consumers and plays a vital role in improving the quality and reliability of power supply. In order to provide reference for improving the reliability of distribution network and to speed up the development of distribution network automation, this paper analyses the system structure, development status and trend of distribution network automation technology.

scholarly journals Mitigation of Harmonics in Power Transmission Network using Filters

2020 ◽  
Vol 9 (1) ◽  
pp. 1283-1288
Keyword(s):  
Power System ◽  
Harmonic Analysis ◽  
Power Quality ◽  
Power Transmission ◽  
Flow Analysis ◽  
Electric Utility ◽  
Load Flow ◽  
Optimal Placement ◽  
Harmonic Currents ◽  
Mitigation Techniques

In the novel times, with the surge in use of power electronics, power quality with system efficiency is playing a symbolic role for the advancement of electric supply. The fundamental purpose of the electric utility is to provide a sinusoidal voltage at constant magnitude throughout the system. This objective is convoluted because of the loads present in the system which produce harmonic currents. Due to these harmonic currents, distorted voltages and currents are carried out which affect the reliability and efficiency of the system in several ways. The sinusoidal waveform produced by electric utilities is distorted due to harmonics and increased use of non-linear loads. The deterioration of the power quality and reliability of the power system is due to the presence of these harmonics in the power system. Hence, we need a proper analytical approach to study, classify and characterize the harmonics present in the system and develop a suitable and effective mitigation method to reduce the harmonics in the power system to standard limits of harmonics prescribed by the IEEE and IEC standards. The study of the level of harmonics present in the system, their causes and effects are known as harmonic analysis or harmonics study. Based on the observations of harmonic analysis we develop mitigation techniques to reduce these harmonics. One such method is the implementation of filters. By implementing harmonic filters, we mitigate the harmonics present in the system by providing a low impedance path. The methodological procedure behind effective design and implementation of filters is achieved by performing load flow analysis to obtain the system data and harmonic analysis to obtain data of harmonics present in the system. Based on the data obtained, the type of filter and the optimal placement of filter is decided to mitigate the harmonics. The mitigation of harmonics can report significant benefits for industries, data centers, etc. in terms of overall installation cost and protection against interruptions and equipment faults in the power system. The overall process of Harmonic analysis and mitigation techniques are performed using Mi-Power software.

scholarly journals Power Quality Analysis of Controlled Rectifiers and their Impact on Input Power System

2018 ◽  
Vol 1 (1) ◽  
pp. 57-65
Author(s):  
Abdul Ghaffar
Keyword(s):  
Power System ◽  
Power Quality ◽  
Research Work ◽  
Harmonic Distortion ◽  
Single Pulse ◽  
Input Power ◽  
Vital Role ◽  
Quality Analysis ◽  
Expansion Plan ◽  
Power Quality Analysis

Pakistan these days facing major energy crisis especially in the power sector. But to overcome these crisis major companies and the govt. of Pakistan is playing vital role so that supply could meet the demand. In association to this a major project National Power System Expansion Plan 2011-2030 has started which further increases the complexity of power system, but one thing in which these power companies are lagging is in the improvement of power quality. This paper introduces the power quality analysis of AC-DC converter topologies and their impact on input power system. Due to latest advancement in the technologies and its usage it is impossible to put barriers for the applications of power electronics topologies. These topologies are of different structure and causes harmonics when connected to the power system, these harmonics affects the power quality of the system network. Due to their wide usage it necessary to observe their impact on the input power system, which includes THD (total harmonic distortion) and distortion in the input power factor etc. This research work focuses on the power quality analysis of the power system. In this paper input THD of single-pulse, two-pulse and six-pulse controlled rectifier are analysed using FFT analysis in MATLAB and their effect on input power system are also discussed.

scholarly journals Power quality problems mitigation using dynamic voltage restorer (DVR) with pi controller and fuzzy logic controller

2018 ◽  
Vol 7 (2.12) ◽  
pp. 214
Author(s):  
Te Jaswini Sarwade ◽  
V S. Jape ◽  
D G. Bharadwaj
Keyword(s):  
Fuzzy Logic ◽  
Power System ◽  
Power Quality ◽  
Fuzzy Logic Controller ◽  
Control Strategies ◽  
Distribution Network ◽  
Pi Controller ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Dynamic Voltage

The existence of non-standard currents, frequencies and voltages enhances the Power Quality (PQ) problems. Power consumed by the consumers and losses occurred in power system are deciding factors for the utility to determine the performance of the power system in terms of Power Quality. These Power Quality problems lead to failure of end user equipments as well as creates disturbances in power distribution network, thereby deteriorates residual life assessment of major equipments used in substation. The PQ problems can be characterized as voltage surges, sags, swells, harmonic distortions, etc. There are many reasons for the determination of Power Quality. The loads used by the consumers of electricity abnormally leads to deprove the Power Quality. Low power factor loads are taken care of by the utilities in the form of financial penalty. However, occurrence of harmonics, voltage swells and sags in the system is the most powerful reason behind degradation of Power Quality. To mitigate these issues, use of Custom Power Devices (CPD) in the distribution network is the most significant solution. Paper presents the design of the CPD like Dynamic Voltage Restorer (DVR) using two control strategies i.e. PI Controller and Fuzzy Logic Controller (FLC). MATLAB/SIMULINK is used to analyze the effectiveness of these control strategies. 

scholarly journals Fault Clearance in Nine-Bus system using Custom Power Devices

2020 ◽  
Vol 9 (2) ◽  
pp. 1756-1762 ◽  
Keyword(s):  
Power System ◽  
Power Quality ◽  
Reactive Power ◽  
Vital Role ◽  
Machine System ◽  
Facts Devices ◽  
Three Phase ◽  
Compensating Devices ◽  
Fault Clearance

The power transfer capability of a system determines the power quality and the reliability of the power system. The transmission side of the power system is of different configuration. This paper involves the modeling of a three-phase multi-machine system with nine bus configurations. The system is subjected to different fault conditions. The system is modeled with the help of MATLAB- Simulink. The power quality of the system is analyzed. The system active and the reactive power can be compensated by the FACTS devices. The FACTS devices are power compensating devices that play a vital role in increasing the power quality of the system. The three-phase multi-machine system is integrated with the FACTS devices like STATCOM and UPFC and different parameters where analyzed

scholarly journals Smart Integration of a DC Microgrid: Enhancing the Power Quality Management of the Neighborhood Low-Voltage Distribution Network

Inventions ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 25
Author(s):  
Ahmed F. Ebrahim ◽  
Ahmed A. Saad ◽  
Osama Mohammed
Keyword(s):  
Power Quality ◽  
Power Flow ◽  
Reactive Power ◽  
Low Voltage ◽  
Distribution Network ◽  
Nonlinear Behavior ◽  
Electrical Equipment ◽  
Voltage Source ◽  
Voltage Distribution ◽  
Dc Microgrid

The fast development of the residential sector regarding the additional integration of renewable distributed energy sources and the modern expansion usage of essential DC electrical equipment may cause severe power quality problems. For example, the integration of rooftop photovoltaic (PV) may cause unbalance, and voltage fluctuation, which can add constraints for further PV integrations to the network, and the deployment of DC native loads with their nonlinear behavior adds harmonics to the network. This paper demonstrates the smart integration of a DC microgrid to the neighborhood low-voltage distribution network (NLVDN). The DC microgrid is connected to the NLVDN through a three-phase voltage source inverter (VSI), in which the VSI works as a distribution static compensator (DSTATCOM). Unlike previous STATCOM work in the literature, the proposed controller of the VSI of the DC smart building allows for many functions: (a) it enables bidirectional active/reactive power flow between the DC building and the AC grid at point of common coupling (PCC); (b) it compensates for the legacy unbalance in the distribution network, providing harmonics elimination and power factor correction capability at PCC; and (c) it provides voltage support at PCC. The proposed controller was validated by Matlab/Simulink and by experimental implementation at the lab.

scholarly journals Power quality improvement recommendations for shipboard power systems

2020 ◽  
pp. 55-61
Author(s):  
В.Ф. Белей ◽  
М.С. Харитонов ◽  
Р.О. Брижак
Keyword(s):  
Power Systems ◽  
Power System ◽  
Energy Saving ◽  
Electric Power ◽  
Power Quality ◽  
Electromagnetic Interference ◽  
Electrical Equipment ◽  
Electric Power System ◽  
Maritime Industry

В настоящее время на судах и объектах морской индустрии широко внедряется энергосберегающее электрооборудование, что позволяет добиться резкого снижения расхода электроэнергии и массогабаритных показателей оборудования, существенно расширяет функциональные возможности электротехнических комплексов и систем, приводит к улучшению эксплуатационных характеристик. Однако использование новейших энергосберегающих технологий, основанных на нелинейных элементах, и коммутация электрооборудования приводит к ухудшению качества электрической энергии в судовой электроэнергетической системе. В то же время, растет число потребителей, предъявляющих к качеству электроэнергии повышенные требования. В итоге, работа судовых энергокомплексов может отличаться от расчетной, а в ряде случаев становится аварийной. В работе приведены результаты экспериментальных исследований показателей качества электрической энергии в судовой электроэнергетической системе учебного парусного судна «Крузенштерн». Представлены результаты лабораторных исследований на физической модели судовой электростанции с источниками электромагнитных помех, обоснованы организационные и технические решения по снижению уровня электромагнитных помех в судовых электроэнергетических системах. Nowadays, energy-saving electrical equipment is widely introduced on ships and maritime industry facilities. It leads to a decrease in power consumption, weight and dimensions of equipment, significantly expands the functionality of electrical complexes and systems, and provides improvement of operational characteristics. However, the use of the latest energy-saving technologies based on non-linear elements and the switching of electrical equipment leads to a deterioration in the quality of electrical energy in the ship's electric power system. At the same time, the number of consumers with increased requirements for the quality of electricity is growing. As a result, the operation of ship power complexes may differ from the normal one, and in some cases it becomes emergency. The paper presents the results of experimental studies of electric power quality indicators in the ship's electric power system of the sail training ship "Kruzenshtern". The results of laboratory studies on a physical model of a ship power plant with sources of electromagnetic interference are presented, organizational and technical solutions to reduce the level of electromagnetic interference in ship power systems are substantiated.

scholarly journals Improving Power Quality of Power System Using D-STATCOM

2019 ◽  
Vol 8 (2S11) ◽  
pp. 2219-2222
Keyword(s):  
Power System ◽  
Power Quality ◽  
Electrical Equipment ◽  
Matlab Simulation ◽  
Static Compensator

In power system there are several types of losses which disturb whole of the electrical equipment installed in it. Therefore, it is required to pay more attention towards the improvement of power quality by minimizing the losses of power system. The present invention relates to the improvement of power quality of power system using distribution static compensator. For improving the power quality, the power system along with the distribution static compensator is designed in the MATLAB simulation and the result obtained after compensating the losses is shown in this paper.

scholarly journals Optical Voltage Transformer Based on FBG-PZT for Power Quality Measurement

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2699
Author(s):  
Marceli N. Gonçalves ◽  
Marcelo M. Werneck
Keyword(s):  
Power System ◽  
Power Quality ◽  
Distribution System ◽  
Electrical Power ◽  
Quality Measurement ◽  
Pockels Effect ◽  
Electrical Power System ◽  
Voltage Transformer ◽  
Technical Literature ◽  
Distribution Lines

Optical Current Transformers (OCTs) and Optical Voltage Transformers (OVTs) are an alternative to the conventional transformers for protection and metering purposes with a much smaller footprint and weight. Their advantages were widely discussed in scientific and technical literature and commercial applications based on the well-known Faraday and Pockels effect. However, the literature is still scarce in studies evaluating the use of optical transformers for power quality purposes, an important issue of power system designed to analyze the various phenomena that cause power quality disturbances. In this paper, we constructed a temperature-independent prototype of an optical voltage transformer based on fiber Bragg grating (FBG) and piezoelectric ceramics (PZT), adequate to be used in field surveys at 13.8 kV distribution lines. The OVT was tested under several disturbances defined in IEEE standards that can occur in the electrical power system, especially short-duration voltage variations such as SAG, SWELL, and INTERRUPTION. The results demonstrated that the proposed OVT presents a dynamic response capable of satisfactorily measuring such disturbances and that it can be used as a power quality monitor for a 13.8 kV distribution system. Test on the proposed system concluded that it was capable to reproduce up to the 41st harmonic without significative distortion and impulsive surges up to 2.5 kHz. As an advantage, when compared with conventional systems to monitor power quality, the prototype can be remote-monitored, and therefore, be installed at strategic locations on distribution lines to be monitored kilometers away, without the need to be electrically powered.

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