针对多重化的背靠背四象限变流器，采用了载波移相控制与改进的SPWM调制相结合的方法，减小了电流谐波，提高了功率交换能力。

For multiple back-to-back four-quadrant converter, a modified SPWM technique is combined with carrier phase-shifting control, which reduces current harmonic and enhances power exchange ability.

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其次，论文研究了基于三角载波移相SPWM控制方法的拓扑扩展。

In the second place, paper researches the topology extends based on Triangular carrier phase shifting SPWM technique.

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其次，论文研究了基于三角载波移相SPWM控制方法的拓扑扩展。

In the second place, paper researches the topology extends based on Triangular carrier phase shifting SPWM technique.

youdao