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Discontinuous Modulation of a Cascaded H-Bridge Low-Capacitance StatCom.
- Source :
-
IEEE Transactions on Power Electronics . Mar2022, Vol. 37 Issue 3, p2790-2800. 11p. - Publication Year :
- 2022
-
Abstract
- This article presents a discontinuous modulation (DM) strategy for static compensators (StatComs) based on a cascaded H-bridge (CHB) converter with a star configuration. The proposed DM strategy considers the capacitor voltage oscillations at twice the fundamental frequency and the effect of zero-sequence voltage injection on the capacitor voltages. Considering these effects is especially important in CHB-StatComs with large capacitor voltage ripples (low-capacitance StatComs), where the assumption of a constant dc-link voltage, which is the basis of conventional DM strategies, does not apply. This article also describes a coherent set of steady-state waveforms for CHB-StatComs under DM. In addition to the well-known benefit of reducing the switching losses, the proposed DM also reduces the dc-link capacitors size and extends the operating range. The viability of the proposed DM strategy is verified experimentally on a small-scale prototype. In addition, simulation results are obtained using a real-scale system to study feasibility of the DM under unbalanced conditions. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CAPACITORS
*ELECTRIC capacity
*VOLTAGE
*VOLTAGE control
*CAPACITOR switching
Subjects
Details
- Language :
- English
- ISSN :
- 08858993
- Volume :
- 37
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Power Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 153953318
- Full Text :
- https://doi.org/10.1109/TPEL.2021.3114976