Abstract This work proposes an adaptive dc-link voltage strategy applied to a double-star chopper cell-based static synchronous compensator (DSCC-STATCOM). The proposed technique aims to improve the converter reliability by controlling the cell reference voltage according to the minimum voltage required in each STATCOM operation condition. It is important to remark that the proposed strategy does not require any hardware modification. The technique is evaluated in terms of dynamics and reliability. For this purpose, two modulation strategies were analyzed: phase-shifted pulse-width modulation (PS-PWM) and nearest-level control with cell tolerance band algorithm (NLC-CTB). The results show that the proposed technique can reduce the switching losses and increase the system reliability. For the evaluated case study, the DSCC-STATCOM B1 lifetime increases 16% and 23% for PS-PWM and NLC-CTB, respectively, when the minimum voltage control strategy is employed.

中文翻译：

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基于模块化多电平级联转换器的STATCOM可靠性改进的最小电压控制

摘要 这项工作提出了一种适用于基于双星斩波器单元的静态同步补偿器 (DSCC-STATCOM) 的自适应直流链路电压策略。所提出的技术旨在通过根据每个 STATCOM 操作条件下所需的最小电压控制单元参考电压来提高转换器的可靠性。需要注意的是，所提出的策略不需要任何硬件修改。该技术在动态和可靠性方面进行评估。为此，分析了两种调制策略：相移脉宽调制 (PS-PWM) 和使用细胞容差带算法 (NLC-CTB) 的最近电平控制。结果表明，所提出的技术可以降低开关损耗，提高系统可靠性。对于评估案例研究，