The present invention relates to a basic function unit of
voltage source converter, which is characterized in that the basic function unit includes a switching device function module, a by-pass function module, a switch protection function module, a secondary control and protection function module, and a
energy storage unit. The secondary control and protection function module, the
energy storage unit and the by-pass function module are all fixed on the
motherboard, there is a slide rail at the bottom of the
motherboard, the
motherboard can move back and forth on the slide rail. The
voltage source converter based on that unit is highly modular, insensitive to switch
device parameters, lower output
voltage change rate, and smaller dv / dt stress of equipment, smaller
noise, without filter, convenient installation and maintenance.