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<p>For enhancing modular multilevel converters’ reliability, lifetime management is vital due to uneven switch/diode lifetimes in SMs. This article takes stimulation from the collaborative and effective predatory behavior of the urocissa erythrorynchas, and proposes a lifetime optimization control for MMCs based on the urocissa erythrorynchas optimization algorithm (UEO-LOC). It mimics their foraging, maps the optimization solution space, and the lifetime of the switch/diode in per SM could be improved by injecting the optimal circulating current of the second-order harmonic circulating current (SHCC) in the MMC. Thus, the recommended strategy significantly enhances MMC’s reliability. Moreover, introducing the UEO-LOC into the field of MMC lifetime optimization also offers a novel way to get optimal circulating current values. Finally, simulation was conducted on PSCAD/EMTDC and a small-scale experiment was executed on the MMC prototype, and results from both the simulations and the experiments have confirmed the availability of the suggested UEO-LOC.</p>

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Power devices lifetime optimization of mmcs based on urocissa erythroryncha optimizer with active utilization of second-order harmonic circulating current

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Jifeng Zhao,
  • Peidong Xu,
  • Yangkang Gui,
  • Monan Li

摘要

For enhancing modular multilevel converters’ reliability, lifetime management is vital due to uneven switch/diode lifetimes in SMs. This article takes stimulation from the collaborative and effective predatory behavior of the urocissa erythrorynchas, and proposes a lifetime optimization control for MMCs based on the urocissa erythrorynchas optimization algorithm (UEO-LOC). It mimics their foraging, maps the optimization solution space, and the lifetime of the switch/diode in per SM could be improved by injecting the optimal circulating current of the second-order harmonic circulating current (SHCC) in the MMC. Thus, the recommended strategy significantly enhances MMC’s reliability. Moreover, introducing the UEO-LOC into the field of MMC lifetime optimization also offers a novel way to get optimal circulating current values. Finally, simulation was conducted on PSCAD/EMTDC and a small-scale experiment was executed on the MMC prototype, and results from both the simulations and the experiments have confirmed the availability of the suggested UEO-LOC.