One dimensional cell inversion: A modulation strategy for hybrid cascaded converters

Christopher D. Townsend, Daniel Tormo, Hector Zelaya De La Parra

Research output: Chapter in Book/Conference paperConference paper

2 Citations (Scopus)


Cascaded converters are being utilised in high-voltage, high-power applications as they can be extended to a large number of levels without introducing significant complexity to the mechanical design. However, StatComs formed from cascaded cells suffer from unequal charging of converter phase-legs during compensation of unbalanced loads. To alleviate this issue energy exchange between cascaded phase-legs is typically achieved using zero sequence voltage or current injection. In this paper the combination of a hybrid cascaded topology and a new modulation scheme facilitate energy exchange. The amount of energy exchange between converter phase-legs in StatCom applications is analysed. The new modulation strategy, termed 1-Dimensional Cell Inversion, improves capacitor voltage balance capability under unbalanced conditions and reduces capacitor voltage ripple in balanced conditions.

Original languageEnglish
Title of host publication2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages8
ISBN (Electronic)9781479956982
Publication statusPublished - 1 Jan 2014
Externally publishedYes

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