Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 3, Pages 2790-2800Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3114976
Keywords
Voltage; Capacitors; Steady-state; Automatic voltage control; Modulation; Clamps; Capacitance; Capacitance reduction; capacitor voltage ripples (CVRs); cascaded H-bridge (CHB); discontinuous modulation (DM); static compensator (StatCom); zero-sequence voltage
Categories
Funding
- Office of Naval Research Global [N62909-19-1-2081]
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This article introduces a discontinuous modulation (DM) strategy for static compensators (StatComs) based on a cascaded H-bridge (CHB) converter with a star configuration. The proposed strategy takes into account the capacitor voltage oscillations and the effect of zero-sequence voltage injection on the capacitor voltages. It can reduce switching losses, decrease the size of dc-link capacitors, and extend the operating range.
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.
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