A novel carrier-based discontinuous pulsewidth modulation (CB_DPWM) strategy for T-type three-level converter is proposed in this article. Because one significant advantage of the proposed CB_DPWM is the reduction of common mode voltage (CMV), it is named as RCMV_CB_DPWM hereafter. It also can reduce switching loss and remove dc offset from the neutral point voltage (NPV) simultaneously. RCMV_CB_DPWM has two design freedoms, one is modulation wave and the other is carrier wave. By injecting zero sequence voltage properly, the corresponding clamping mode can be acquired. Moreover, reduced CMV can be achieved by arranging carrier wave flexibly. The integrity of RCMV_CB_DPWM is analyzed as well as its NPV self-equilibrium ability, and an active NPV control method is then introduced. Moreover, its realization is discussed briefly. Finally, the experiments are carried out to verify the effectiveness of the proposed method.

中文翻译：

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一种基于载波的降低共模电压和中性点电压控制的T型三电平逆变器断续PWM策略


本文提出了一种用于 T 型三电平变换器的新型基于载波的不连续脉宽调制（CB_DPWM）策略。由于所提出的 CB_DPWM 的一个显着优点是共模电压 (CMV) 的降低，因此以下将其命名为 RCMV_CB_DPWM。它还可以减少开关损耗并同时消除中性点电压 (NPV) 的直流偏移。 RCMV_CB_DPWM有两个设计自由度，一是调制波，二是载波。通过适当地注入零序电压，可以获得相应的钳位模式。此外，还可以通过灵活布置载波来降低CMV。分析了RCMV_CB_DPWM的完整性及其NPV自平衡能力，并介绍了一种主动NPV控制方法。此外，还对其实现进行了简要讨论。最后进行实验验证所提方法的有效性。