Control Strategy Based on Arm-Level Control for Output and Circulating Current of MMC in Stationary Reference Frame

Waqar Uddin, Tiago D. C. Busarello, Kamran Zeb, Muhammad Adil Khan, Anil Kumar Yedluri and Hee-Je Kim
Additional contact information
Waqar Uddin: Department of Electrical Engineering, Pusan National University, Busan 46241, Korea
Tiago D. C. Busarello: Department of Engineering, Federal University of Santa Catarina, Blumenau 89036-256, Brazil
Kamran Zeb: School of Electrical & Computer Science (SEECS), National University of Science and Technology, Islamabad 44000, Pakistan
Muhammad Adil Khan: Department of Electrical & Computer Engineering, Air University, Islamabad 44000, Pakistan
Anil Kumar Yedluri: Department of Electrical Engineering, Pusan National University, Busan 46241, Korea
Hee-Je Kim: Department of Electrical Engineering, Pusan National University, Busan 46241, Korea

Energies, 2021, vol. 14, issue 14, 1-20

Abstract: This paper proposed a control method for output and circulating currents of modular multilevel converter (MMC). The output and circulating current are controlled with the help of arm currents, which contain DC, fundamental frequency, and double frequency components. The arm current is transformed into a stationary reference frame (SRF) to isolate the DC and AC components. The AC component is controlled with a conventional proportional resonant (PR) controller, while the DC component is controlled by a proportional controller. The effective control of the upper arm and lower arm ultimately controls the output current so that it delivers the required power to the grid and circulating current in such a way that the second harmonic component is completely vanished leaving behind only the DC component. Comparative results of leg-level control based on PR controller are included in the paper to show the effectiveness of the proposed control scheme. A three-phase, five-level MMC is developed in MATLAB/Simulink to verify the effectiveness of the proposed control method.

Keywords: modular multilevel converter; arm current; circulating current; proportional resonant controller (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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