一种基于负电压电平的混合模块多电平变换器容错方法

Saleh Farzamkia, Arash Khoshkbar-Sadigh, V. Dargahi
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引用次数: 0

摘要

针对混合模块式多电平变换器的工作原理,提出了一种保证变换器在故障后仍能充分发挥其性能的有效方法。本文的主要新颖之处在于利用负臂电压电平来补偿丢失的电压。故障发生后,根据故障状态调整臂上直流分量电压和直流链路电压,使其恢复到故障后标称的线路平衡电压。与以前的方法相比,所提出的方法不需要在电路中添加任何硬件来恢复标称输出电压。故障发生后,各子模块的电容电压也不升高。因此,转换器可以在故障后状态下保持其标称线对线电压,而无需额外的实施成本或过度设计要求。为了验证该方法的有效性,给出了详细的仿真和实验结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Fault-Tolerant Approach for Hybrid Modular Multilevel Converter Using Negative Voltage Levels
This paper focuses on the operation of hybrid modular multilevel converter and proposes an effective approach that guarantees the full performance of the converter even in post-fault condition. The main novelty of this paper is utilizing negative arm voltage levels in a way to compensate the missed voltage. After the fault occurrence, the DC component of the arm voltages as well as the DC-link voltage are adjusted based on the fault states to restore the nominal balanced line-to-line voltage in the post-fault condition. In comparison with the previous methods, the proposed method does not add any hardware to the circuit to restore the nominal output voltage. The capacitor voltage of submodules, also, does not increase after fault occurrence. Therefore, the converter can maintain its nominal line-to-line voltage in post-fault condition without extra implementation costs or overdesign requirements. To validate the effectiveness of the proposed method, detailed simulation and experimental results are provided.
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