Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9952112 | International Journal of Electrical Power & Energy Systems | 2019 | 11 Pages |
Abstract
This paper proposes a general analysis model and an improved arm control of modular multilevel converter (MMC) under asymmetric operation conditions. This general analysis model is established as the arm voltage equations with equivalent impedance parameters, and is applicable for characteristics analysis under both submodule (SM) fault condition and asymmetric arm parameter condition. Based on the analysis model, the equivalent circuits of the circulating current and the ac side current are obtained, and then the asymmetric characteristics are performed. According to the analysis results, an improved arm control of MMC is proposed, which is aimed at balancing the dc components in upper and lower arm currents, as well as suppressing the fundamental and double frequency circulating currents. Besides, the dynamic response of the proposed arm control is significantly improved by embedding an arm voltage inertial feedback control. Simulations on PSCAD/EMTDC verify the correctness of the theoretical analysis and the validity of the proposed control strategy.
Keywords
Related Topics
Physical Sciences and Engineering
Computer Science
Artificial Intelligence
Authors
Ziwen Liu, Shihong Miao, Zhihua Fan, Kaiyun Chao, Yuliang Liu,