A New Adaptive Approach to Control Circulating and Output Current of Modular Multilevel Converter

Energies. 2019;12(6):1118 DOI 10.3390/en12061118

 

Journal Homepage

Journal Title: Energies

ISSN: 1996-1073 (Print)

Publisher: MDPI AG

LCC Subject Category: Technology

Country of publisher: Switzerland

Language of fulltext: English

Full-text formats available: PDF, HTML

 

AUTHORS

Muhammad Ishfaq (Department of Electrical Engineering, Pusan National University Busan, South Korea San 30, ChangJeon Dong, Pusandaehak-ro 63 7 beon-gil 2, Geumjeong-gu, Busan-city-46241, Korea)
Waqar Uddin (Department of Electrical Engineering, Pusan National University Busan, South Korea San 30, ChangJeon Dong, Pusandaehak-ro 63 7 beon-gil 2, Geumjeong-gu, Busan-city-46241, Korea)
Kamran Zeb (Department of Electrical Engineering, Pusan National University Busan, South Korea San 30, ChangJeon Dong, Pusandaehak-ro 63 7 beon-gil 2, Geumjeong-gu, Busan-city-46241, Korea)
Imran Khan (Department of Electrical Engineering, Pusan National University Busan, South Korea San 30, ChangJeon Dong, Pusandaehak-ro 63 7 beon-gil 2, Geumjeong-gu, Busan-city-46241, Korea)
Saif Ul Islam (Department of Electrical Engineering, Pusan National University Busan, South Korea San 30, ChangJeon Dong, Pusandaehak-ro 63 7 beon-gil 2, Geumjeong-gu, Busan-city-46241, Korea)
Muhammad Adil Khan (Department of Electrical and Computer Science, Air University, Islamabad City 44000, Pakistan)
Hee Je Kim (Department of Electrical Engineering, Pusan National University Busan, South Korea San 30, ChangJeon Dong, Pusandaehak-ro 63 7 beon-gil 2, Geumjeong-gu, Busan-city-46241, Korea)

EDITORIAL INFORMATION

Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 11 weeks

 

Abstract | Full Text

This paper addresses the output current and circulating current control of the modular multi-level converter (MMC). The challenging task of MMCs is the control of output current and circulating current. Existing control structures for output and circulating current achieve control objectives with comparatively complex controllers and the designed parameters for the controller is also difficult. In this paper, an adaptive proportional integral (API) controller is designed to control the output current and the circulating current. The output current is regulated in <inline-formula> <math display="inline"> <semantics> <mrow> <mi>&#945;</mi> <mi>&#946;</mi> </mrow> </semantics> </math> </inline-formula> axes while the circulating current is regulated in the <inline-formula> <math display="inline"> <semantics> <mrow> <mi>a</mi> <mi>b</mi> <mi>c</mi> </mrow> </semantics> </math> </inline-formula> stationary frame to enhance MMC performance. The output and circulating current control results using an API controller are compared with the conventional proportional resonant (PR) controller in terms of transient response, stability, optimal performance, and reference tracking for results verification. The API control architecture significantly improve transient response, stability, and have excellent reference tracking capability. Moreover, it controls output current and converges the circulating current to a desired value. The control structure is designed for a three-phase MMC system, simulated and analyzed in MATLAB-Simulink.