High power factor high power density high voltage converter based on AC link

Abstract

To meet the demand of high efficiency, high power density and good input and output performance for high power high voltage converter, the high frequency AC‐link scheme, below resonance mode of LCC resonant circuit and soft‐switched control method are combined in the proposed converter. The AC‐link scheme can bring good performance at input port with small size, the continuous mode can reduce the peak current value in switches and the conduction loss, soft‐switching character can reduce the switching loss. To make the combination applicable in high voltage application, this study introduces a control method including switch commutation, control algorithm and control block diagram. To verify accuracy of control parameters and feasibility of the proposed converter, the simulation and experiment are conducted on a 50 kV, 80 kW prototype. It turns out that the experiment results are in agreement with simulation and theoretically expected results. The experimental results also show that the output voltage ripple is less than 1% at 50 kV, the input power factor is 0.99, the total harmonic distortion of input current is less than 7.5%, the total efficiency is 94.5% and power density is 0.93 W/cm 3 .

Key findings

• ▸The experimental results also show that the output voltage ripple is less than 1% at 50 kV, the input power factor is 0.
• ▸5%, the total efficiency is 94.
• ▸5% and power density is 0.
• ▸93 W/cm³.

Keywords

Identifiers

DOI

10.1049/iet-pel.2016.0225

Journal

IET Power Electronics

Year

2017