Investigation of Active Damping Approaches for PI-Based Current Control of Grid-Connected Pulse Width Modulation Converters With LCL Filters

被引：484

作者：

Dannehl, Joerg ^{[1
]}

Fuchs, Friedrich Wilhelm ^{[1
]}

Hansen, Steffan ^{[2
]}

Thogersen, Paul Bach ^{[3
]}

机构：

[1] Univ Kiel, Inst Power Elect & Elect Drives, D-24143 Kiel, Germany

[2] Danfoss Drives AS, DK-6100 Grasten, Denmark

[3] KK Elect AS, DK-9220 Aalborg, Denmark

来源：

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS | 2010年 / 46卷 / 04期

关键词：

Active resonance damping; current feedback; grid-connected PWM converter; LCL filter; PI current control; voltage feedback; DESIGN; INVERTERS;

D O I：

10.1109/TIA.2010.2049974

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper deals with various active damping approaches for PI-based current control of grid-connected pulsewidth-modulation (PWM) converters with LCL filters, which are based on one additional feedback. Filter capacitor current, as well as voltage feedback for the purpose of resonance damping, are analyzed and compared. Basic studies in the continuous Laplace domain show that either proportional current feedback or derivative voltage feedback yields resonance damping. Detailed investigations of these two approaches in the discrete z-domain, taking into account the discrete nature of control implementation, sampling, and PWM, are carried out. Several ratios of LCL resonance frequency and control frequency are considered. At high resonance frequencies, only current feedback stabilizes the system. At medium resonance frequencies, both approaches have good performance. At low resonance frequencies, stability gets worse, even though voltage feedback offers slightly better damping properties. Measurements validate the theoretical results.

引用

页码：1509 / 1517

页数：9

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