Influence of Delay on System Stability and Delay Optimization of Grid-Connected Inverters With LCL Filter

Delay is inevitable in digital-controlled system and the delay will change system phase-frequency characteristic, thus affecting system stability. The system stability of inductor-capacitor-inductor (LCL)-type grid-connected inverter with single-loop control based on inverter-side current and single...

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Published inIEEE transactions on industrial informatics Vol. 10; no. 3; pp. 1775 - 1784
Main Authors Zou, Changyue, Liu, Bangyin, Duan, Shanxu, Li, Rui
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.08.2014
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Adjustment
Control systems
Damping
Delay
Delays
Inverters
Optimization
Power system stability
Resonant frequency
Stability criteria
Systems stability
inverter
total harmonic distortion (THD)
Alias
sampling delay
digital control
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Summary:Delay is inevitable in digital-controlled system and the delay will change system phase-frequency characteristic, thus affecting system stability. The system stability of inductor-capacitor-inductor (LCL)-type grid-connected inverter with single-loop control based on inverter-side current and single-loop control based on grid-side current is analyzed both in continuous and discrete domains. The influence of delay time on system stability is systematically studied. A delay time control method that is capable of adjusting delay time is further proposed to improve system stability. The proposed delay time control method is applied in the experiment, making an unstable system to be stable, and verifies the analysis result and proposed method.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1551-3203
1941-0050
DOI:10.1109/TII.2014.2324492