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Impact of Switching Harmonics on Capacitor Cells Balancing in Phase-Shifted PWM Based Cascaded H-Bridge STATCOM

Ehsan Behrouzian (Institutionen för energi och miljö, Elteknik) ; Massimo Bongiorno (Institutionen för energi och miljö, Elteknik) ; Remus Teodorescu (Institutionen för energi och miljö)
IEEE transactions on power electronics (0885-8993). 99, (2016)
[Artikel, refereegranskad vetenskaplig]

The purpose of this paper is to investigate the impact of switching harmonics on the instantaneous power distribution in the cells of a cascaded H-Bridge based STATCOM when using Phase-Shifted PWM. The case of high and low switching frequency for the converter cells are investigated and the interaction between voltage and current harmonics is analyzed. It is shown that in both cases, this interaction results in an uneven power distribution among the cells in the same phase leg, leading to drifting of the dc-capacitor voltages and thereby the need for proper stabilization control loops. It is also shown that the selected frequency modulation ratio affects the active power distribution among the cells. In particular, the selection of a non-integer frequency modulation ratio helps in providing a more uniform power distribution among cells of the same phase leg, thus contributing to the capacitors balancing. A methodology for optimal selection of the frequency modulation ratio is given. Theoretical conclusions are validated through simulation and experimental results.

Nyckelord: Multilevel systems, Cascade systems, Static VAR compensators, Reactive power control, Pulse width modulation, Harmonic analysis

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Denna post skapades 2016-08-30.
CPL Pubid: 240919


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Institutioner (Chalmers)

Institutionen för energi och miljö, Elteknik
Institutionen för energi och miljö



Chalmers infrastruktur