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- 摘要
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- 实验方案
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[IEEE 2019 IEEE International Conference on Unmanned Systems (ICUS) - Beijing, China (2019.10.17-2019.10.19)] 2019 IEEE International Conference on Unmanned Systems (ICUS) - Observability Enhancement of the Target Tracking Model Based on Infrared Semi-strapdown Seeker
摘要： A large petrochemical company installed nearly 50 000 hp of electrical submersible pumps (ESPs) at an existing midwest U.S. oil ?eld. Being equipped with adjustable-speed drives (ASDs), these ESPs introduced high levels of current harmonic dis-tortion, which resulted in 14%–19% voltage harmonic distortion at the electrical utility supply. Initially, the utility noticed the low power factor (PF) and had the oil company pay for the installation of power factor correction (PFC) capacitors on their medium-voltage supply. Once installed, the utility began to have problems with these capacitors and continued to receive complaints from other customers adjacent to the oil ?eld; thus, they enforced har-monic limits, as de?ned by IEEE Std 519, at all points of common coupling. Measurements were made with a harmonic analyzer at several locations throughout the electrical system to quantify harmonics and determine the effect the ESPs were having on the utility distribution system. Computer simulations were performed to analyze different methods of harmonic mitigation. Ultimately, passive harmonic ?lters were installed on all ESPs in phases. In addition, the PFC capacitors were permanently disconnected after determining that a power system resonance condition existed. Once all phases of the project were complete, the voltage distortion level decreased to below 5%, and PF improved to near unity without the PFC capacitors. This paper will describe the effect of harmonics on the electrical distribution system caused by ASDs, practical solutions to excessive voltage harmonic distortion, reso-nance issues with PFC capacitors, and the challenges associated with different methods of harmonic mitigation.
关键词： resonance,Adjustable-speed drives (ASDs),electrical submersible pumps (ESPs),harmonic quantities,harmonics,capacitors,harmonic ?lters,harmonic mitigation,power factor correction (PFC),harmonic distortion
更新于2025-09-19 17:13:59
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L vs. LCL Filter for Photovoltaic Grid-Connected Inverter: A Reliability Study
摘要： The increasing use of photovoltaic systems entails the use of new technologies to improve the efficiency and power quality of the grid. System performance is constantly increasing, but its reliability decreases due to factors such as the uncontrolled operation, the quality of the design and quantity of components, and the use of nonlinear loads that may lead to distortion in the signal, which directly affects the life of the system globally. This article presents an analysis of the reliability of a single-phase full-bridge inverter for active power injection into the grid, which considers the inverter stage with its coupling stage. A comparison between an L filter and an LCL filter, which comprise the coupling stage, is made. Reliability prediction is based on metrics, failure rate, mean time between failures, and total harmonic distortion. The analysis and numerical simulation are performed. Finally, filter considerations are suggested to extend the reliability of the inverter in a photovoltaic system.
关键词： photovoltaic systems,LCL filter,L filter,reliability,total harmonic distortion
更新于2025-09-19 17:13:59
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[IEEE IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society - D.C., DC, USA (2018.10.21-2018.10.23)] IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society - Steady-state equivalent circuit of LED bulbs accounting for the current harmonics
摘要： Nowadays, the light-emitting diode (LED) bulb is one of the preferred choice in lighting system design. Electrical models of the LED lamps have to consider their nonlinear behavior involving current distortion on the mains. With this purpose, an equivalent electrical circuit emulating the current drawn by a LED Bulbs is carried out. In this work, different lamps have been tested under variable supply voltage. The comparison between the simulations performed by means of PSpice and the experimental measurements has highlighted that linear interpolation for the amplitude of each harmonic current, as function of the voltage on the main, provides a good estimation of the total current waveform.
关键词： LED Bulbs,power conversion,LED lamps,Current harmonics,equivalent circuits,lighting,total harmonic distortion,power quality
更新于2025-09-19 17:13:59
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Design and performance analysis of improved Adaline technique for synchronization and load compensation of grida??tied photovoltaic system
摘要： The paper discusses the design, modeling, simulation, and implementation of improved Adaline technique, which has been used for grid synchronization as well as extended further for load compensation. A simple but effective method is proposed to improve the performance of the conventional Adaline technique. The conventional Adaline controller uses a fixed learning rate while the proposed Adaline is developed using variable learning, which improves both the steady-state and dynamic response. Simulation and experimental results have been demonstrated, which confirm the feasibility of the proposed approach. Suitable performance comparisons highlight the effectiveness of the proposed approach.
关键词： power quality,ANN,phase-locked loops,synchronization,harmonic distortion
更新于2025-09-19 17:13:59
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[IEEE 2019 Workshop on Recent Advances in Photonics (WRAP) - Guwahati, India (2019.12.13-2019.12.14)] 2019 Workshop on Recent Advances in Photonics (WRAP) - Stand-off Femtosecond Laser Induced Breakdown Spectroscopy of Metals, Soil, Plastics and Classification Studies
摘要： This paper presents one of the first studies of the harmonic impact of a significantly large photovoltaic (PV) solar farm of 20 MW in a utility distribution system. This solar farm is a constituent of the 80-MW PV solar farm in Sarnia, Ontario, which is so far the largest solar farm in Canada. The utility network is modeled in detail using the commercial grade PSCAD/EMTDC software, which is validated through load flow studies conducted by CYME software and correlated with SCADA measurements. The validated network model is used for network resonance study and harmonics impact analysis of the solar farms under different network conditions. The harmonics data instrumented for several months were provided by the transmission utility at the two solar farm units and at the main feeder substation. These data were utilized for extensive harmonic impact studies with widely different short-circuit levels and network resonance conditions. This paper presents the detailed procedure adopted for performing such harmonic impact studies. It is concluded that this large solar farm may not cause any substantial voltage distortion on the distribution network during steady-state operating conditions. However, recommendations are made for utilities to perform such studies to ensure the safe operation of critical loads.
关键词： network resonance,total harmonic distortion,solar energy,harmonics,Distribution systems,total demand distortion,photovoltaic (PV) solar system,frequency scan
更新于2025-09-16 10:30:52
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Disturbances Generated by Lighting Systems with LED Lamps and the Reduction in Their Impacts
摘要： The paper deals with electromagnetic disturbances in the form of current higher harmonics, which are generated by LED lighting elements. It presents the problems related to the formation and impact of higher harmonics in the electrical systems of commercial facilities. The results of tests and analyses of current distortions for two di?erent LED lamps are included, and these are in reference to the parameters set out in the normal applicable standards. A system was then proposed to improve the quality of energy in the mains of commercial facilities in the form of a two-stage power supply. Tests of the systems with the aforementioned LED lamps were conducted and commented upon after introduction of the two-stage power supply. The ?nal part of the paper contains a summary of the obtained test results.
关键词： electromagnetic compatibility,total harmonic distortion (THD),LED lamp,two-stage power supply,current and voltage distortion,lighting system,power factor correction (PFC),higher harmonics
更新于2025-09-16 10:30:52
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Investigate quality factor of single tuned passive filter to reduce harmonic of LED lamp
摘要： The use of LED energy-saving lamps is proliferating in the world and ranging from homes, offices to government buildings. The main reason for this is because LED lights have relatively small electrical power consumption. Behind the advantage of saving energy, it turns out that LED lights have a high level of harmonic. Passive filter is recommended to eliminate harmonic. The Quality factor (Q) of a filter will determine its performance. If the Q value is significant, the value of R will be smaller, and the quality of the filter will also be getting better because the energy used by the filter is lowering. It indicates that the heat losses of the filter are small. This work has tested four single tuned passive filter designs on X brand LED lamps with nominal power values of 3W, 4W, and 7W. The inductor values (L) tested were 65mH, 78mH, 91mH, and 115mH, respectively. The test results show that the total harmonic distortion (THD) of voltage on the X brand LED lights does not exceed the IEEE 519-2014 standard limit which is a maximum of 5%, because the highest harmonic voltage is 2.7%. While the highest total harmonic distortion (THD) of current in the LED lamps tested was 154%. The results of installing the first filter (L = 65mH) can reduce THD current up to 90.91%, the second filter (L = 78mH) reduces THD current up to 89.81%, the third filter (L = 91mH) reduces THD current up to 89.57%, while the fourth filter (L = 115mH) reduces THD current up to 86.86%.
关键词： quality factor,LED lamp,total harmonic distortion,passive filter,harmonic
更新于2025-09-16 10:30:52
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Harmonics assessment and mitigation in a photovoltaic integrated network
摘要： This paper presents a comprehensive review of harmonics dominance in PV integrated network. The findings of the review conducted for different scenarios are further supported by the results of an experimental case study exploring the dominance of harmonics in a real time PV integrated microgridunder varying solar irradiance condition. It is concluded that the level of Total Harmonic Distortions (THD) in the power system network varies in different scenarios. Some of the important scenarios are: (i) percentage of PV penetration in distribution network with respect to the types of connected load, (ii) location of PV integration, (iii) effect of harmonic resonance in power network, and (iv) varying power output of PV inverters with varying solar irradiance. A harmonic management system is finally proposed to limit the excessive harmonics in the network under different network conditions. The proposed harmonic management can be used to maintain the THD level within the standard limit and ensures the quality of energy supply to the communities.
关键词： Solar irradiance,Harmonic resonance,Photovoltaic (PV),Total harmonic distortion (THD),Microgrid (MG)
更新于2025-09-16 10:30:52
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Computation and Communication Technologies || Implementation of Multilevel Z-Source Inverter using Solar Photovoltaic Energy system for Hybrid Electric Vehicles
摘要： This paper extends a topology for cascaded multilevel Z source inverter employs of z source inverter unit block with bidirectional switches. The conventional z source inverter consist network impedance with multiple indictors and capacitors arranged Z type topology performs either buck or boost the input voltage for non linear load depending upon duty ratio and modulation index in a multiple stage conversion with the help of impedance source passive network (L and C Z source inverter reduces harmonic distortion and overcomes limitations of conventional inverters. The proposed multilevel Z source inverter reduces harmonics further and provides a novel topology for power conversion. Capability of proposed configuration in producing all odd and even output voltage level source with input to the power source and increase the power efficiency is proved by simulation result for 3-level inverter. The output of the proposed system is simulated using MATLAB-SIMULINK and implemented in real simulation hardware for electric vehicles using dSPIC controller.
关键词： MATLAB,dSPIC,multilevel z-source inverter,ZSI,total harmonic distortion
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Gramado, Brazil (2019.9.15-2019.9.18)] 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Analysis of Harmonic Distortion on Low Voltage Distribution Systems with Electric Vehicles and Photovoltaic Systems
摘要： Power electronic interfacing based devices, such as photovoltaic systems and electric vehicles chargers cause harmonic distortion on the power grid. This has been an increasing concern, especially in low voltage residential systems as these devices are becoming common and expected to be largely integrated into distribution systems. In this context, this paper focuses on a harmonic analysis based on daily simulations considering loads and generation pro?les with characteristics spectra of harmonics for residential loads, photovoltaic systems and electric vehicle chargers. Effects on the grid will depend on the phase angles of each harmonic component, distortion indexes will not behave in a simple additive way due to the variety of connected devices.
关键词： harmonic distortion,electric vehicles,Distribution systems,photovoltaic systems,low voltage
更新于2025-09-16 10:30:52