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.

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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