Improved Composite Control of Grid-Connected Inverter

doi:10.3969/j.issn.1000-565X.2015.08.003

Journal of South China University of Technology (Natural Science Edition) ›› 2015, Vol. 43 ›› Issue (8): 15-20.doi: 10.3969/j.issn.1000-565X.2015.08.003

• Power & Electrical Engineering • Previous Articles Next Articles

Improved Composite Control of Grid-Connected Inverter

Gui Cun-bing Xie Yun-xiang Cheng Li Wang Yu

School of Electric Power，South China University of Technology，Guangzhou 510640，Guangdong，China

Received:2014-09-29 Revised:2015-03-12 Online:2015-08-25 Published:2015-07-01
Contact: 桂存兵(1974-)，男，博士，副教授，主要从事电力电子技术在电力系统中的应用研究． E-mail:ahui200491@126.com
About author:桂存兵(1974-)，男，博士，副教授，主要从事电力电子技术在电力系统中的应用研究．
Supported by:
Supported by the Project of Integration of Industry，Education and Research of Guangdong Province and Ministry of Education of China(2011B090400136)

Abstract

Abstract: The LCL filter is a third-order system of a low damping，where resonanceis easy to occur． Aiming at the
issue，this paper adopts a dual-loop control strategy with the grid-connected current feedback and the capacitor current feedback to control the grid-connected current，and then designs a novel repetitive controller，which possesses a modified self-adaptive internal model and is plugged in the system． This repetitive controller is combined with the traditional PI control to form a new improved composite control scheme，thus improving the working stability of the LCL filter，minimizing the current harmonic distortion and increasing the performance of the grid-connected inverter． Finally，the feasibility and superiority of the improved scheme are verified by simulations and experiments． Besides，whether the voltage frequency of power systems changes or not，the improved scheme can effectively avoid the resonance of grid currents and can achieve a high in-grid power factor．

Key words: LCL filter, a modified self-adaptive internal model, modified repetitive control, freguency, adaptability

Gui Cun-bing Xie Yun-xiang Cheng Li Wang Yu. Improved Composite Control of Grid-Connected Inverter[J]. Journal of South China University of Technology (Natural Science Edition), 2015, 43(8): 15-20.

References

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Improved Composite Control of Grid-Connected Inverter

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