Open AccessCoordinative impedance damping control for back‐to‐back converter in solar power integration system
Author(s) -
Tian Yanjun,
Peng Fei,
Wang Yi,
Chen Zhe
Publication year - 2019
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
ISSN - 1752-1424
DOI - 10.1049/iet-rpg.2019.0105
Subject(s) - electrical impedance , control theory (sociology) , output impedance , inverter , converters , resistive touchscreen , damping factor , impedance control , input impedance , power (physics) , engineering , negative impedance converter , quarter wave impedance transformer , stability (learning theory) , computer science , boost converter , control (management) , physics , electrical engineering , voltage , quantum mechanics , artificial intelligence , machine learning
The back‐to‐back topology of dual active bridges DC/DC converter cascaded with DC/AC inverter hasbeen widely used in solar power integration system. The output impedance of DABconverter will interact with the input impedance of inverter, and without properdesign, stability degradation will be engaged. Against the impedance interactioncaused stability degradation problems, typical solution is to modify converter'simpedance feature through control strategies, named as active solution, butconventional active solutions solely pay attention to single individualconverter. Here, a coordinative impedance active damping control method isproposed, which simultaneously modifies the front DAB and rear inverterimpedances, promoting a more stable manner. This article compares the proposedcontrol with conventional individual impedance damping control methods. Theimpedance‐based stability evaluations show that the proposed control can promptDC‐link connected converters to perform resistive impedance in the low‐frequencyband, thus the impedance interaction will be more damped, which contributes toan enhanced stability and dynamics. The effectiveness of the proposed controlhas been tested by both simulation and experiment results.