Currcnt-type four quadrant converter is an AC-DC converting device with pulse width modulation, whose advantages are high power factor, low harmonic current and convenient regeneration etc.

电流型四象限变流器是一种脉冲宽度调制的交直流变换装置，具有功率因数高、谐波电流小、再生方便等优点。

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The study reveals that the voltage support in the inverter is the main limiting factor for the effectiveness of the HVDC emergent power modulation.

揭示了逆变站电压支撑不足是限制直流功率紧急提升充分发挥作用的主要因素。

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The results clearly show conduction losses are the function of semiconductor static characteristic, power factor, modulation depth and load current.

该表达式与器件静特性、功率因数、调制度及负载电流有关，利用其计算不同载波调制下通态损耗时只需改动导通占空比。

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