Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 1, Pages 15-24Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.2965470
Keywords
Modular multilevel converter; sensorless module balancing; series/parallel module (SPM); static compensator (STATCOM)
Categories
Funding
- National Science Foundation [1608929, 1610074]
- North Carolina Biotechnology Center [2016-CFG-8004]
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Cascaded multilevel converters have gained popularity in static compensators (STATCOMs) due to their modularity, output quality, and fault tolerance. This article proposes a reduced series/parallel module (RSPM) as a replacement for H-bridges in cascaded multilevel STATCOMs, achieving better efficiency with 25% fewer transistors. The proposed RSPM balances capacitor voltages in a sensorless manner and maintains a similar semiconductor utilization ratio as H-bridge modules.
Cascaded multilevel converters have been gaining popularity in static compensators (STATCOMs) owing to their excellent modularity, output quality, and fault tolerance. However, cascaded multilevel converters require a large number of galvanically isolated voltage sensors and complex communication systems in order to balance the module dc-link voltages. This article proposes a reduced series/parallel module (RSPM) that intends to replace H-bridges in cascaded multilevel STATCOMs. Any adjacent RSPMs can be configured in series, bypass, or parallel. Cycling the parallel state through all modules balances all capacitor voltages in a sensorless manner. Since the RSPM-balancing process occurs at the hardware level, H-bridges can be easily replaced by RSPMs without changing higher-level control loops. Compared to existing series/parallel modules, the RSPM has the same functionalities but uses 25% fewer transistors. Despite the reduced switch count, the RSPM is shown to achieve even better efficiency under certain load conditions. The RSPM also attains similar semiconductor utilization ratio as H-bridge modules. The features of the RSPMs are verified on simulations and a down-scaled experimental setup.
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