ABSTRACT

This paper presents a new switching strategy by combining space vector modulation (SVM) and pulse amplitude modulation (PAM) techniques. The proposed method can eliminate harmonics and reduce power loss, leading to efficiency increment. Moreover, as one of the significant challenges in any modulation technique, the common-mode voltage is investigated. Accordingly, applying the proposed method in a conventional back-to-back two-level converter results in a substantial reduction of the common-mode voltage as well as the harmonic content of the systems’ input current fed by the power grid. Also, easy implementation regardless of the converter’s rating is the other advantage of using this method. Furthermore, applying this strategy does not add to the converter’s volume, weight, and cost. The appropriate selection of the active vectors, the arrangement of the switching sequences for the inverter and rectifier, as well as the modulation index of the converter are key factors in this technique. The performance of the proposed strategy is investigated through both simulations and experimentations on a back-to-back two-level converter prototype. The experimental results show that the proposed method reduces the common-mode voltage by more than 50%, reaching 87.2% efficiency, making the proposed method suitable for industrial applications.

摘要

本文提出了一种结合空间矢量调制（SVM）和脉冲幅度调制（PAM）技术的新开关策略。该方法可以消除谐波并减少功率损耗，从而提高效率。此外，作为任何调制技术的重大挑战之一，我们对共模电压进行了研究。因此，在传统的背靠背两电平转换器中应用所提出的方法导致共模电压以及由电网馈送的系统输入电流的谐波含量的显着降低。此外，无论转换器的额定值如何，都可以轻松实施，这是使用此方法的另一个优点。此外，应用这种策略不会增加转换器的体积、重量和成本。适当选择活性载体，逆变器和整流器的开关序列的布置以及转换器的调制指数是该技术的关键因素。通过在背靠背两电平转换器原型上进行仿真和实验来研究所提出策略的性能。实验结果表明，该方法将共模电压降低了50%以上，效率达到87.2%，适合工业应用。