Harmonic Current Suppression Strategy for Grid-Connected PWM Converters with LCL Filters

Rende Zhao; Qian Li; Hailiang Xu; Yansong Wang; Josep M. Guerrero

doi:10.1109/ACCESS.2019.2893226

Harmonic Current Suppression Strategy for Grid-Connected PWM Converters with LCL Filters

Rende Zhao, Qian Li, Hailiang Xu^*, Yansong Wang, Josep M. Guerrero

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

15 Citations (Scopus)

104 Downloads (Pure)

Abstract

As for a grid-connected PWM converter with LCL filter, harmonic current can flow freely into the grid-side inductor and filter capacitor, when the connected power grid is harmonically distorted. The fact lies in that the conventional control scheme has a little ability to suppress the grid current harmonics. Though the harmonics can be suppressed by the capacitor current compensation method, it may lead to system stability issues. This paper proposes an improved harmonic suppression scheme with the partial capacitor current feedforward, which can effectively suppress the specified grid current harmonics on the premise of ensuring the system stability. Since the partial capacitor current is obtained as the differential output of a multi-second-order generalized integrator, no extra current sensors are needed. The effectiveness and feasibility of the proposed strategy are verified by detailed experimental results.

Original language	English
Article number	8618432
Journal	IEEE Access
Volume	7
Pages (from-to)	16264-16273
Number of pages	10
ISSN	2169-3536
DOIs	https://doi.org/10.1109/ACCESS.2019.2893226
Publication status	Published - Jan 2019

Keywords

Grid-connected converter
Harmonic current
LCL filter
Resonant control

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10.1109/ACCESS.2019.2893226

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title = "Harmonic Current Suppression Strategy for Grid-Connected PWM Converters with LCL Filters",

abstract = "As for a grid-connected PWM converter with LCL filter, harmonic current can flow freely into the grid-side inductor and filter capacitor, when the connected power grid is harmonically distorted. The fact lies in that the conventional control scheme has a little ability to suppress the grid current harmonics. Though the harmonics can be suppressed by the capacitor current compensation method, it may lead to system stability issues. This paper proposes an improved harmonic suppression scheme with the partial capacitor current feedforward, which can effectively suppress the specified grid current harmonics on the premise of ensuring the system stability. Since the partial capacitor current is obtained as the differential output of a multi-second-order generalized integrator, no extra current sensors are needed. The effectiveness and feasibility of the proposed strategy are verified by detailed experimental results.",

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author = "Rende Zhao and Qian Li and Hailiang Xu and Yansong Wang and Guerrero, {Josep M.}",

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volume = "7",

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T1 - Harmonic Current Suppression Strategy for Grid-Connected PWM Converters with LCL Filters

AU - Zhao, Rende

AU - Li, Qian

AU - Xu, Hailiang

AU - Wang, Yansong

AU - Guerrero, Josep M.

PY - 2019/1

Y1 - 2019/1

N2 - As for a grid-connected PWM converter with LCL filter, harmonic current can flow freely into the grid-side inductor and filter capacitor, when the connected power grid is harmonically distorted. The fact lies in that the conventional control scheme has a little ability to suppress the grid current harmonics. Though the harmonics can be suppressed by the capacitor current compensation method, it may lead to system stability issues. This paper proposes an improved harmonic suppression scheme with the partial capacitor current feedforward, which can effectively suppress the specified grid current harmonics on the premise of ensuring the system stability. Since the partial capacitor current is obtained as the differential output of a multi-second-order generalized integrator, no extra current sensors are needed. The effectiveness and feasibility of the proposed strategy are verified by detailed experimental results.

AB - As for a grid-connected PWM converter with LCL filter, harmonic current can flow freely into the grid-side inductor and filter capacitor, when the connected power grid is harmonically distorted. The fact lies in that the conventional control scheme has a little ability to suppress the grid current harmonics. Though the harmonics can be suppressed by the capacitor current compensation method, it may lead to system stability issues. This paper proposes an improved harmonic suppression scheme with the partial capacitor current feedforward, which can effectively suppress the specified grid current harmonics on the premise of ensuring the system stability. Since the partial capacitor current is obtained as the differential output of a multi-second-order generalized integrator, no extra current sensors are needed. The effectiveness and feasibility of the proposed strategy are verified by detailed experimental results.

KW - Grid-connected converter

KW - Harmonic current

KW - LCL filter

KW - Resonant control

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DO - 10.1109/ACCESS.2019.2893226

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EP - 16273

JO - IEEE Access

JF - IEEE Access

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Harmonic Current Suppression Strategy for Grid-Connected PWM Converters with LCL Filters

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