ABSTRACT This paper proposes a novel Space Vector Pulse Width Modulation strategy extending conventional 2-D SVPWM strategies for its use in three-phase four-leg inverters. The methodology is based on the segregation of the zero sequence from any initial desired unbalance voltage set-points. In this way, the operation of the fourth leg is reserved to manage the desired homopolar component and to compensate for the inherent homopolar component provided by any 2-D SVPWM technique. This choice not only minimizes the complexity and effort to determine the location of the reference voltage space vector from a 3-D to a 2-D space but also enables to use 75% of the affordable space to synthesize voltages under a 3-D SVPWM technique. Furthermore, the proposal is compared with other four 3-D SVPWM techniques analysing the advantages in terms of execution time, memory program, simplicity and neutral to mid-point voltage quality, resulting into a really good implementing alternative compared with the major 3-D SPVWM techniques analysed. The new modulation strategy is presented in detail, and a complete set of simulations using this particular modulation strategy has been done, and the results of these simulations have been validated on a laboratory set-up using a four-leg inverter.

中文翻译：

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为三相四桥臂逆变器扩展二维空间矢量 PWM

摘要 本文提出了一种新的空间矢量脉冲宽度调制策略，扩展了传统的二维 SVPWM 策略，用于三相四桥臂逆变器。该方法基于零序与任何初始所需的不平衡电压设定点的隔离。这样，第四条腿的操作被保留来管理所需的单极分量并补偿任何二维 SVPWM 技术提供的固有单极分量。这种选择不仅最大限度地减少了确定从 3-D 到 2-D 空间的参考电压空间矢量位置的复杂性和工作量，而且还能够使用 75% 的可负担空间来合成 3-D SVPWM 下的电压技术。此外，该提议与其他四种 3-D SVPWM 技术进行了比较，分析了在执行时间、存储器程序、简单性和中性到中点电压质量方面的优势，与主要的 3-D SPVWM 技术相比，这是一个非常好的实施替代方案分析。详细介绍了新的调制策略，并使用此特定调制策略完成了一组完整的模拟，并且这些模拟的结果已在使用四桥臂逆变器的实验室设置上得到验证。