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A Reduced Series/Parallel Module for Cascade Multilevel Static Compensators Supporting Sensorless Balancing
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DOI：10.1109/TIE.2020.2965470.png)
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Abstract
En 中文
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.
Keywords:
Modular multilevel converter
sensorless module balancing
series/parallel module (SPM)
static compensator (STATCOM)
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