An Analysis of Harmonic Disturbances in Distribution Systems Caused by Grid-Connected Inverters: Experimental Verification of High-Order Harmonic Resonance

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Paper number
1513
Working Group Number
Conference name
CIRED 2019
Conference date
3-6 June 2019
Conference location
Madrid, Spain
Peer-reviewed
Yes
Short title
Convener
Authors
Okada, Naotaka, CRIEPI, Japan
Sano, Kenichiro, Tokyo Institute of Technology, Japan
Noda, Yoshichika, CRIEPI, Japan
Fukushima, Kentaro, CRIEPI, Japan
Abstract
Harmonic disturbances caused by the high-order harmonics (2kHz ~ 9kHz) of grid-connected inverters were observed in the medium-voltage distribution systems which host a large amount of distributed generations. It was demonstrated by the previous computer simulations that voltage harmonics may exceed the suppression level of the distribution system even if the current harmonics of the inverters satisfy the suppression level recommended in the grid-code. It is required to validate the disturbance by the experiment along with clarifying its condition and mechanism.This research investigates harmonic characteristics of the grid-connected inverters by the experiment under different switching frequency and grid configurations. Large harmonic voltage is observed across the shunt capacitor if the series resonant frequency of the grid-side impedance coincides with the switching frequency of the inverter. Since the grid-side impedance decreases at the series resonant frequency, harmonic current leaks from the harmonic filter, and then it flows into the shunt capacitor. The series resonant frequency is influenced by the grid-side impedance, which can be calculated by the circuit parameters.
Table of content
Keywords
Publisher
AIM
Date
2019-06-03
Permanent link to this record
https://cired-repository.org/handle/20.500.12455/431
http://dx.doi.org/10.34890/657
ISSN
2032-9644
ISBN
978-2-9602415-0-1