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首页> 外文期刊>Power Electronics, IET >Submodule power balancing control of modular multilevel converters under capacitor degradation
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Submodule power balancing control of modular multilevel converters under capacitor degradation

机译：电容器下劣化模块化多电平转换器的子模块电力平衡控制

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摘要

Impedance characteristics of the floating capacitor in the submodule (SM) of a modular multilevel converter (MMC) change due to its chemical and aging characteristics. This can result in a rise of voltage ripple across SM capacitors, uneven power distribution among the SMs and could also interrupt the operation with prolonged use of degraded capacitors. Existing balancing approaches are presented for the MMC with equal SM capacitance and ignored the effect of capacitor degradation as well as parameter mismatch. Hence, a closed-loop control scheme that incorporates the effect of capacitor degradation is much necessitated. This study aims to overcome this gap by proposing a new power balancing control algorithm for SM capacitors, which effectively controls and evenly distributes the power among SMs. The efficacy of the proposed strategy is substantiated through PLECS simulations and OPAL-RT/OP4510 controller-based experiments on a single-phase MMC laboratory prototype.
机译：由于其化学和老化特性，模块化多级转换器（MMC）模块化多级转换器（MMC）中的浮动电容的阻抗特性。这可能导致SM电容器之间的电压纹波的升高，短信之间的功率分布不均匀，并且可以长时间使用降级的电容器来打断操作。具有等于​​SM电容的MMC的现有平衡方法，并忽略电容器劣化以及参数不匹配的影响。因此，需要一种闭环控制方案，其包含电容器劣化的效果。本研究旨在通过提出用于SM电容器的新功率平衡控制算法来克服该差距，从而有效地控制SMS之间的电力。所提出的策略的功效通过PLECS模拟和OPAL-RT / OP4510控制器在单相MMC实验室原型的实验中证实。

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