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

Energies

Muhammad Adil Khan¹  Waqar Uddin²  Hee-Je Kim²  Anil Kumar Yedluri²  Tiago D. C. Busarello³  Kamran Zeb⁴ 

[1] Department of Electrical & Computer Engineering, Air University, Islamabad 44000, Pakistan;Department of Electrical Engineering, Pusan National University, Busan 46241, Korea;Department of Engineering, Federal University of Santa Catarina, Blumenau 89036-256, Brazil;School of Electrical & Computer Science (SEECS), National University of Science and Technology, Islamabad 44000, Pakistan;

关键词: modular multilevel converter;    arm current;    circulating current;    proportional resonant controller;   

DOI  :  10.3390/en14144160

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown