Reliability Assessment of Wind Farm Electrical System Based on a Probability Transfer Technique
The electrical system of a wind farm has a significant influence on the wind farm reliability and electrical energy yield. The disconnect switch installed in an electrical system cannot only improve the operating flexibility, but also enhance the reliability for a wind farm. Therefore, this paper de...
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doaj-10e9446a1d644e04b31729cc5836fb2d2020-11-25T01:02:53ZengMDPI AGEnergies1996-10732018-03-0111474410.3390/en11040744en11040744Reliability Assessment of Wind Farm Electrical System Based on a Probability Transfer TechniqueHejun Yang0Lei Wang1Yeyu Zhang2Xianjun Qi3Lei Wang4Hongbin Wu5School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, ChinaSchool of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, ChinaSchool of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, ChinaSchool of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, ChinaSchool of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, ChinaSchool of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, ChinaThe electrical system of a wind farm has a significant influence on the wind farm reliability and electrical energy yield. The disconnect switch installed in an electrical system cannot only improve the operating flexibility, but also enhance the reliability for a wind farm. Therefore, this paper develops a probabilistic transfer technique for integrating the electrical topology structure, the isolation operation of disconnect switch, and stochastic failure of electrical equipment into the reliability assessment of wind farm electrical system. Firstly, as the traditional two-state reliability model of electrical equipment cannot consider the isolation operation, so the paper develops a three-state reliability model to replace the two-state model for incorporating the isolation operation. In addition, a proportion apportion technique is presented to evaluate the state probability. Secondly, this paper develops a probabilistic transfer technique based on the thoughts that through transfer the unreliability of electrical system to the energy transmission interruption of wind turbine generators (WTGs). Finally, some novel indices for describing the reliability of wind farm electrical system are designed, and the variance coefficient of the designed indices is used as a convergence criterion to determine the termination of the assessment process. The proposed technique is applied to the reliability assessment of a wind farm with the different topologies. The simulation results show that the proposed techniques are effective in practical applications.http://www.mdpi.com/1996-1073/11/4/744wind farmreliability assessmentelectrical topologyprobabilityreliability indices |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hejun Yang Lei Wang Yeyu Zhang Xianjun Qi Lei Wang Hongbin Wu |
spellingShingle |
Hejun Yang Lei Wang Yeyu Zhang Xianjun Qi Lei Wang Hongbin Wu Reliability Assessment of Wind Farm Electrical System Based on a Probability Transfer Technique Energies wind farm reliability assessment electrical topology probability reliability indices |
author_facet |
Hejun Yang Lei Wang Yeyu Zhang Xianjun Qi Lei Wang Hongbin Wu |
author_sort |
Hejun Yang |
title |
Reliability Assessment of Wind Farm Electrical System Based on a Probability Transfer Technique |
title_short |
Reliability Assessment of Wind Farm Electrical System Based on a Probability Transfer Technique |
title_full |
Reliability Assessment of Wind Farm Electrical System Based on a Probability Transfer Technique |
title_fullStr |
Reliability Assessment of Wind Farm Electrical System Based on a Probability Transfer Technique |
title_full_unstemmed |
Reliability Assessment of Wind Farm Electrical System Based on a Probability Transfer Technique |
title_sort |
reliability assessment of wind farm electrical system based on a probability transfer technique |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2018-03-01 |
description |
The electrical system of a wind farm has a significant influence on the wind farm reliability and electrical energy yield. The disconnect switch installed in an electrical system cannot only improve the operating flexibility, but also enhance the reliability for a wind farm. Therefore, this paper develops a probabilistic transfer technique for integrating the electrical topology structure, the isolation operation of disconnect switch, and stochastic failure of electrical equipment into the reliability assessment of wind farm electrical system. Firstly, as the traditional two-state reliability model of electrical equipment cannot consider the isolation operation, so the paper develops a three-state reliability model to replace the two-state model for incorporating the isolation operation. In addition, a proportion apportion technique is presented to evaluate the state probability. Secondly, this paper develops a probabilistic transfer technique based on the thoughts that through transfer the unreliability of electrical system to the energy transmission interruption of wind turbine generators (WTGs). Finally, some novel indices for describing the reliability of wind farm electrical system are designed, and the variance coefficient of the designed indices is used as a convergence criterion to determine the termination of the assessment process. The proposed technique is applied to the reliability assessment of a wind farm with the different topologies. The simulation results show that the proposed techniques are effective in practical applications. |
topic |
wind farm reliability assessment electrical topology probability reliability indices |
url |
http://www.mdpi.com/1996-1073/11/4/744 |
work_keys_str_mv |
AT hejunyang reliabilityassessmentofwindfarmelectricalsystembasedonaprobabilitytransfertechnique AT leiwang reliabilityassessmentofwindfarmelectricalsystembasedonaprobabilitytransfertechnique AT yeyuzhang reliabilityassessmentofwindfarmelectricalsystembasedonaprobabilitytransfertechnique AT xianjunqi reliabilityassessmentofwindfarmelectricalsystembasedonaprobabilitytransfertechnique AT leiwang reliabilityassessmentofwindfarmelectricalsystembasedonaprobabilitytransfertechnique AT hongbinwu reliabilityassessmentofwindfarmelectricalsystembasedonaprobabilitytransfertechnique |
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