Analysis of distortions in switch drives and currents related to balance
strategy with sort method in MMC systems

Chuyang Wang; Lan Xiao; Li Zhang; Feng Wu; Qi Liu

Analysis of distortions in switch drives and currents related to balance strategy with sort method in MMC systems

Vol. 20, No. 2, pp. 399-409, Mar. 2020

10.1007/s43236-020-00046-2

Balance strategy

Switching frequency increase

Current distortion

State switcher

Abstract

The traditional balance strategy with a sort method has some disadvantages and can cause different types of deteriorations in an MMC system, including an increase in the switching frequency and distortions in the currents. However, quantitative analyses for these deteriorations are neglected during the design of the balance strategy, which decreases the effect of the strategy. This paper first develops accurate descriptions for an MMC system and the structure of its balance strategy. Based on these descriptions, the root cause and quantitative degree of the switching frequency increase are both determined for the first time. A quantitative analysis for the degree of the current distortion is obtained as well. Based on the above analysis, a state switcher and balancing-time calculator are proposed and introduced into the balance strategy, which effectively decrease the magnitudes of these deteriorations. The deteriorations caused by the traditional balance strategy and efficiency of the improved balance strategy are finally demonstrated via experimental results.

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Cite this article

[IEEE Style]

C. Wang, L. Xiao, L. Zhang, F. Wu, Q. Liu, "Analysis of distortions in switch drives and currents related to balance strategy with sort method in MMC systems," Journal of Power Electronics, vol. 20, no. 2, pp. 399-409, 2020. DOI: 10.1007/s43236-020-00046-2.

[ACM Style]

Chuyang Wang, Lan Xiao, Li Zhang, Feng Wu, and Qi Liu. 2020. Analysis of distortions in switch drives and currents related to balance strategy with sort method in MMC systems. Journal of Power Electronics, 20, 2, (2020), 399-409. DOI: 10.1007/s43236-020-00046-2.