An Ignored Culprit of Harmonic Oscillation in LCL-Type Grid-Connected Inverter: Resonant Pole Cancelation

Autor:	Guoxing Su, Xuehua Wang, Yuying He, Xinbo Ruan, Donghua Pan
Rok vydání:	2021
Předmět:	Harmonic analysis Physics Control theory Inverter Resonance Filter (signal processing) Electrical and Electronic Engineering Type (model theory) Grid Stability (probability) Harmonic oscillator
Zdroj:	IEEE Transactions on Power Electronics. 36:14282-14294
ISSN:	1941-0107 0885-8993
DOI:	10.1109/tpel.2021.3084810
Popis:	Resonant pole cancelation is usually adopted in the current control or active damping to tackle the filter resonance in the LCL -type grid-connected inverter. However, its potential impact on the system stability has not been adequately assessed. This article provides a comprehensive investigation on three typical control schemes that utilize resonant pole cancelation. An important finding is drawn that the resonant pole cancelation violates the so-called internal stability, which can give rise to the undesired harmonic oscillation in grid current. From the physical insights, it is revealed that the resonant pole cancelation does not essentially eliminate the LCL resonance but merely “hide” it in the system, which can still be triggered and, thereby, turns into the culprit of the harmonic oscillation. The theoretical expectation is validated by the simulation and experimental results.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6a481bda5216e481eb53c37fb7600418 https://doi.org/10.1109/tpel.2021.3084810 Zobrazit plný text záznamu