Harmonic Stability Assessment for Multi-Paralleled, Grid-Connected Inverters

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Abstract

This paper investigates the dynamic interactions of current controllers for multi-paralleled, grid-connected inverters. The consequent harmonics instability phenomena, which features with oscillations above the fundamental frequency, are evaluated by the impedance-based stability criterion. The frequency range of effective impedance-based stability analysis is first identified. The effect of each inverter on the system harmonic instability is then identified by case studies on different groups of inverters. Lastly, the PSCAD/EMTDC simulations on a system with five passivelydamped, LCL-filtered inverters are performed to verify theoretical analysis. It shows that the impedance-based stability analysis results agree with the time-domain simualtions provided that the frequency of concerns are around the half of the Nyquist sampling frequency.
Original languageEnglish
Title of host publicationProceedings of the IEEE International Power Electronics and Application Conference and Exposition (IEEE PEAC'14)
Number of pages6
PublisherIEEE Press
Publication dateNov 2014
Pages1098-1103
ISBN (Print)978-1-4799-6768-1
DOIs
Publication statusPublished - Nov 2014
EventIEEE International Power Electronics and Application Conference and Exposition (IEEE PEAC'14) - Shanghai, China
Duration: 5 Nov 20148 Nov 2014

Conference

ConferenceIEEE International Power Electronics and Application Conference and Exposition (IEEE PEAC'14)
CountryChina
CityShanghai
Period05/11/201408/11/2014

Keywords

  • Impedance-Based Stability Criterion
  • PSCAD
  • LCL-filter
  • Harmonic Stability
  • Paralleled Inverters

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