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首页> 外文期刊>Power Electronics, IET >State feedback control strategy and voltage balancing scheme for a transformer-less STATic synchronous COMpensator based on cascaded H-bridge converter
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State feedback control strategy and voltage balancing scheme for a transformer-less STATic synchronous COMpensator based on cascaded H-bridge converter

机译：基于级联H桥变换器的无变压器静态同步整流器的状态反馈控制策略和电压平衡方案

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摘要

In this study, a transformer-less STATic synchronous COMpensator (STATCOM) based on cascaded H-bridge (CHB) multilevel converter with floating DC links is presented. This study introduces a control strategy based on state feedback control algorithm in order to supply reactive power to the grid and to compensate the total losses in the internal H-bridge cells. Using this strategy, the converter stability and the fast dynamic response are guaranteed. Moreover, a voltage balancing strategy is proposed, which not only regulates the DC-link voltage of H-bridge cells to the reference value, but also evenly distributes total reactive power among the converter cells, even when there is difference between the losses of H-bridge cells. A 21-level CHB-based STATCOM is simulated in PSCAD/EMTDC environment to evaluate the performance and effectiveness of the new control strategy. Furthermore, the validity of new method is verified on a down-scaled 7-level CHB prototype.
机译：本文研究了一种基于浮动直流环节的级联H桥（CHB）多电平转换器的无变压器静态同步整流器（STATCOM）。这项研究介绍了一种基于状态反馈控制算法的控制策略，以便向电网提供无功功率并补偿内部H桥单元中的总损耗。使用这种策略，可以确保转换器的稳定性和快速的动态响应。此外，提出了一种电压平衡策略，该策略不仅将H桥单元的DC链路电压调节到参考值，而且即使在H损耗之间存在差异时，也可以在转换器单元之间平均分配总无功功率-桥细胞。在PSCAD / EMTDC环境中模拟了基于21级CHB的STATCOM，以评估新控制策略的性能和有效性。此外，新方法的有效性在缩小的7级CHB原型上得到了验证。

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