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Proceedings ArticleDOI

Laboratory model of surface roughness to test wind turbine voltage flicker

01 Aug 2017-
Abstract: In this paper the test set up is developed in which there is a provision of various surface roughnesses in the test set ups. In the test set ups there is a provision of sea sand, river sand, river pebbles of various sizes, grass, building models of various heights, hills models of various heights and slopes and offshore environment with artificial water waves is available. The main idea in this patent is that various types of surface roughness are created in the wind turbine test set up. The onshore environment can be created by using trays of sand of various sizes. The offshore environment can be created by using a tray of water at the bottom of the test set up. Artificial waves of water are created by a motor coupled with four longitudinal cups welded together and mounted on a shaft. Because of this continuous waves are produced. Another method of producing waves is that use a surface with inverted V all along the surface. The water is needed to move continuously with the help of a pump. This will also create the waves. The impact of wave height on flicker will be observed. For the surface of grass actual grass tiles may be fixed on the surface of the wind turbine test set up. For river bank surface, sand and pebbles of river can be kept at the bottom of the test set up

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Topics: Surface roughness (53%)
References
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Book
12 Dec 2014-
TL;DR: Electrical Generation and Distribution Systems and Power Quality DisturbancesTerrorism and the Electric Power Delivery SystemPower Quality in Power Systems and Electrical MachinesAdvances in Electrical and Computer TechnologiesPower Quality Issues in Distributed GenerationPower QualityPower System HarmonicsUnderstanding Power Quality ProblemsPower Quality problems and Its Mitigation TechniquesPower Quality Problems and Mitigation Methods: Case Study at DBBFSignal Processing of Power QualitydisturbancesElectric Power QualityMicrogrid Architectures, Control and Protection MethodsPower Quality issues.

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Abstract: Electrical Generation and Distribution Systems and Power Quality DisturbancesTerrorism and the Electric Power Delivery SystemPower Quality in Power Systems and Electrical MachinesAdvances in Electrical and Computer TechnologiesPower Quality Issues in Distributed GenerationPower QualityPower System HarmonicsUnderstanding Power Quality ProblemsPower Quality Problems and Its Mitigation TechniquesPower Quality Problems and Mitigation Methods: Case Study at DBBFSignal Processing of Power Quality DisturbancesElectric Power QualityMicrogrid Architectures, Control and Protection MethodsPower Quality IssuesComputing Algorithms with Applications in EngineeringICCCE 2020Renewable and Efficient Electric Power SystemsHandbook of Research on New Solutions and Technologies in Electrical Distribution NetworksGeomagnetic Disturbances Impacts on Power SystemsComputational Paradigm Techniques for Enhancing Electric Power QualityEmerging Trends in Electrical, Communications and Information TechnologiesPower Quality in Electrical SystemsElectric Power SystemsPower Quality in Modern Power SystemsPower System Protection in Smart Grid EnvironmentIntegration of Renewable Energy Sources with Smart Grid7th IEEE India International Conference on Power ElectronicsPower Electronics and Power QualityInstantaneous Power Theory and Applications to Power ConditioningElectrical Power Systems QualityHandbook on Battery Energy Storage SystemLoad Flow Optimization and Optimal Power FlowHandbook of Power QualityPower Quality in Power Systems and Electrical MachinesDistribution Reliability and Power QualityPower Quality Enhancement Using Custom Power DevicesPower System Harmonics Analysis, Effects and Mitigation Solutions for Power Quality ImprovementPower QualityBow Ties in Process Safety and Environmental ManagementPower System Control Under Cascading Failures

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550 citations


Book
07 Apr 2000-
TL;DR: Power Quality Indices and Standards, Power Assessment Under Waveform Distortion, and Power Quality Monitoring: Evaluation of Power System Harmonic Distortion.

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Abstract: Power Quality Indices and Standards. Power Assessment Under Waveform Distortion. Waveform Processing Techniques. Power Quality Monitoring. Evaluation of Power System Harmonic Distortion. Power Quality State Estimation. Appendices. Index.

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385 citations


Journal ArticleDOI
Tao Sun1, Zhe Chen1, Frede Blaabjerg1Institutions (1)
Abstract: Grid connected wind turbines may produce flicker during continuous operation. This paper presents a simulation model of a MW-level variable speed wind turbine with a doubly fed induction generator developed in the simulation tool of PSCAD/EMTDC. Flicker emission of variable speed wind turbines with doubly fed induction generators is investigated during continuous operation, and the dependence of flicker emission on mean wind speed, wind turbulence intensity, short circuit capacity of grid and grid impedance angle are analyzed. A comparison is done with the fixed speed wind turbine, which leads to a conclusion that the factors mentioned above have different influences on flicker emission compared with that in the case of the fixed speed wind turbine. Flicker mitigation is realized by output reactive power control of the variable speed wind turbine with doubly fed induction generator. Simulation results show the wind turbine output reactive power control provides an effective means for flicker mitigation regardless of mean wind speed, turbulence intensity and short circuit capacity ratio.

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252 citations


Journal ArticleDOI
A. Larsson1Institutions (1)
Abstract: This paper presents an analysis and the modeling of the flicker emission of wind turbines. Measurements compared with international standards are discussed. The paper concentrates on the theoretical aspects of the flicker algorithm, wind turbine characteristics, and the generation of flicker during continuous operation of wind turbines.

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197 citations


Journal ArticleDOI
Abstract: Wind energy conversion systems (WECS) produce fluctuating output power, which may cause voltage fluctuations and flicker. Flicker assessment in networks may be difficult since its evaluation requires long computing time and special procedures to calculate the flicker severity index, Pst. In this paper, a frequency domain method to study flicker propagation is presented. This method is based on propagation of frequency components from WECS output currents throughout the grid. In this way, a fast flicker analysis in a network of any size can be performed. Also, an algorithm for flicker measurement in the frequency domain, which allows Pst calculation, is proposed. Several study cases have been performed, and results have been compared with time domain simulations, showing good agreement between them.

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89 citations


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