A framework to analyze the stochastic harmonics and resonance of wind energy grid interconnection

Youngho Cho, Choongman Lee, Kyeon Hur, Yong Cheol Kang, Eduard Muljadi, Sang Ho Park, Young Do Choy, Gi Gab Yoon

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Abstract

This paper addresses a modeling and analysis methodology for investigating the stochastic harmonics and resonance concerns of wind power plants (WPPs). Wideband harmonics from modern wind turbines (WTs) are observed to be stochastic, associated with real power production, and they may adversely interact with the grid impedance and cause unexpected harmonic resonance, if not comprehensively addressed in the planning and commissioning of the WPPs. These issues should become more critical as wind penetration levels increase. We thus propose a planning study framework comprising the following functional steps: First, the best fitted probability density functions (PDFs) of the harmonic components of interest in the frequency domain are determined. In operations planning, maximum likelihood estimations (MLEs) followed by a chi-square test are used once field measurements or manufacturers' data are available. Second, harmonic currents from the WPP are represented by randomly-generating harmonic components based on their PDFs (frequency spectrum) and then synthesized for time domain simulations via inverse Fourier transform. Finally, we conduct a comprehensive assessment by including the impacts of feeder configurations, harmonic filters and the variability of parameters. We demonstrate the efficacy of the proposed study approach for a 100-MW offshore WPP consisting of 20 units of 5-MW full converter turbines, a realistic benchmark system adapted from a WPP under development in Korea and discuss lessons learned through this research.

Original languageEnglish
Article number700
JournalEnergies
Volume9
Issue number9
DOIs
Publication statusPublished - 2016 Jan 1

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All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

Cite this

Cho, Y., Lee, C., Hur, K., Kang, Y. C., Muljadi, E., Park, S. H., Choy, Y. D., & Yoon, G. G. (2016). A framework to analyze the stochastic harmonics and resonance of wind energy grid interconnection. Energies, 9(9), [700]. https://doi.org/10.3390/en9090700