模块化多电平换流器的过压分析和阻塞序列的补救措施

OPAL-RT

Modular Multilevel Converters Over-Voltage Diagnosis and Remedial Strategy During Blocking Sequences
8 |8 v! j1 C' t9 U' \0 U6 t2 F模块化多电平换流器的过压分析和阻塞序列的补救措施
In this paper the authors first highlight an existing over-voltage phenomenon that is inherent to the Modular Multilevel Converter (MMC) topology. The latter occurs during the blocking sequences of semiconductor devices if the converter needs to be stopped due to circulating current, loss of control or unexpected faults. An analysis based on time domain expressions describing each operating sequence during normal and faulty blocking conditions is used to demonstrate the origin of this over-voltage. Thereafter, system behavior is obtained when devices gating signals are withheld as well as the exact over-voltage cause. Real-time simulation, with sub-microsecond time-steps, and experimental results validate the over-voltage phenomena and the proposed remedial strategy to avoid uncontrolled faulty conditions.
这篇论文中作者们首先强调了一种模块化多电平换流器（MMC）拓扑结构中固有的过压现象。如果由于环流，失控或意外故障导致换流器需要被停止，过压现象就会在半导体的阻塞序列过程中产生。一项基于时域表达的描述在正常和故障阻塞情况下每个操作序列的分析被用于证明过压的原因。而后，当设备门信号被抑制以及精确过压产生时，系统行为就被推导出来。实时仿真拥有亚微秒步长，实验结果证实过压现象和文中提出的补救措施可防止不受控制的故障情况。
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