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首页> 外文期刊>Power Electronics, IET >DC-link capacitor voltage balance strategy of independent double three-phase common bus five-level NPC/H-bridge inverter based on finite control set
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DC-link capacitor voltage balance strategy of independent double three-phase common bus five-level NPC/H-bridge inverter based on finite control set

机译：基于有限控制集的独立双三相公共总线五级NPC / H桥逆变器的DC-Link电容电压平衡策略

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摘要

This study aims at the DC-link capacitor voltage imbalance problem of independent double three-phase common bus five-level neutral point-clamped/H-bridge inverter, which is applied to an electromagnetic launch system under instant high-power and high-current conditions. First, the traditional method of voltage balance strategy based on redundant vectors is described, and the key factors leading to the DC-link capacitor voltage fluctuation is analysed in detail. Second, the objective function is constructed to predict the variation trend of DC-link capacitance voltage difference. Third, an optimised voltage balance strategy is proposed. At first, the optimised strategy calculates the variation trends of the voltage difference for all three-phase switch vector combinations. Then, the results make up a voltage balance finite control set. At last, compare the results in the set to select the vector combination corresponding to the minimum variation for output. Finally, tested by the semi-physical real-time simulation platform, and the proposed optimised voltage balance strategy is verified effective for improving DC-link capacitor voltage imbalance and inhibiting the voltage difference fluctuation.
机译：本研究旨在独立双三相公共总线五级中性点夹紧/ H桥逆变器的直流链路电容器电压不平衡问题，该逆变器应用于瞬间大功率和高电流的电磁发射系统使适应。首先，描述了基于冗余矢量的电压平衡策略的传统方法，并详细分析了导致DC连杆电容器电压波动的关键因素。其次，构造目标函数以预测DC连杆电容电压差的变化趋势。第三，提出了优化的电压平衡策略。首先，优化的策略计算所有三相开关矢量组合的电压差的变化趋势。然后，结果构成了电压平衡有限控制集。最后，比较集中的结果，以选择对应于输出的最小变化的矢量组合。最后，由半物理实时仿真平台进行测试，并且验证了所提出的优化电压平衡策略，可用于改善直流链路电容器电压不平衡并抑制电压差波动。

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