A modular multilevel converter circulation suppression method based on SOGI

Journal of Lanzhou University of Technology ›› 2021, Vol. 47 ›› Issue (2): 80-86.

• Automation Technique and Computer Technology • Previous Articles Next Articles

A modular multilevel converter circulation suppression method based on SOGI

ZHANG Ming-guang^1,2,3, CHANG Jian-hua^1,2,3, YANG Cheng-ming^1,2,3, LIU Zi-lin^1,2,3

1. College of Electrical and Information Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;
2. Key Laboratory of Gansu Advanced Control for Industrial Processes, Lanzhou Univ. of Tech., Lanzhou 730050, China;
3. National Demonstration Center for Experimental Electrical and Control Engineering Education, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2019-12-06 Online:2021-04-28 Published:2021-05-11

Abstract

Abstract: The high voltage direct current based on modular multilevel converter (MMC-HVDC) has occupied an important position in the power field, but modular multilevel converter has a circulating current, which can increase the rated capacity and system loss of switches and other components, seriously affecting the working characteristics of MMC. In order to suppress the circulation, the main higher harmonics in MMC circulation are analyzed, for the second and fourth harmonics, a multi-harmonic filter based on the second order generalized integrator (SOGI) was first designed to extract the harmonic components in the circulating current, then circulating current suppressing controller based on proportional resonant was designed to suppress harmonic components. Finally, a 21 level MMC-HVDC simulation model is built in PSCAD, and compared with the traditional circulation suppression method, the results show that the proposed method can suppress circulation more effectively.

Key words: circulating current suppression, second order generalized integrator, PR control

CLC Number:

TM72

ZHANG Ming-guang, CHANG Jian-hua, YANG Cheng-ming, LIU Zi-lin. A modular multilevel converter circulation suppression method based on SOGI[J]. Journal of Lanzhou University of Technology, 2021, 47(2): 80-86.

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A modular multilevel converter circulation suppression method based on SOGI

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