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首页> 外文期刊>Power Electronics, IET >Simple carrier-based pulse-width modulation scheme for three-phase four-wire neutral-point-clamped inverters with neutral-point balancing
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Simple carrier-based pulse-width modulation scheme for three-phase four-wire neutral-point-clamped inverters with neutral-point balancing

机译：具有中性点平衡的三相四线中性点钳位型逆变器的基于载波的简单脉宽调制方案

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摘要

Neutral-point-clamped (NPC) three-level inverters can drive a combination of single- and three-phase loads or non-linear in a three-phase four-wire distribution system. However, an intrinsic problem with NPC three-level inverters is the fluctuation in the neutral-point (NP) voltage. In this study, a dynamic model of the NP voltage in a three-phase four-wire system will be analysed and developed. On the basis of this model, a simple carrier-based pulse-width modulation scheme for NP balancing is proposed. The proposed scheme decouples the NP voltage balancing from the necessity to control phase voltages, and controls the NP voltage without introducing zero-sequence voltage, thus the scheme can be applied to a general NPC voltage source inverter. The effectiveness of the proposed modulation scheme is verified by both simulation and experimental results. Finally, these results are compared with those reported in the literature.
机译：中性点钳位（NPC）的三电平逆变器可以驱动三相四线配电系统中的单相和三相负载或非线性负载的组合。但是，NPC三电平逆变器的一个固有问题是中性点（NP）电压的波动。在这项研究中，将分析和开发三相四线系统中NP电压的动态模型。在此模型的基础上，提出了一种用于NP平衡的基于载波的简单脉宽调制方案。所提出的方案将NP电压平衡与控制相电压的必要性解耦，并且在不引入零序电压的情况下控制NP电压，因此该方案可以应用于一般的NPC电压源逆变器。仿真和实验结果都验证了所提出的调制方案的有效性。最后，将这些结果与文献报道的结果进行比较。

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