The invention relates to a three-level high-
voltage high-power water-cooled frequency converter
system, which comprises a water-cooled filter cabinet, an expandable bridge arm parallel frequency converter cabinet, a full digital regulating cabinet, a water-cooled excitation winding
system cabinet and a
water circulation heat dissipation
system cabinet. The water-cooled filter cabinet, the expandable bridge arm parallel frequency converter cabinet, the full digital regulating cabinet, the water-cooled excitation winding system cabinet, and the
water circulation heat dissipation system cabinet are mutually assembled from left to right to form a complete high-
voltage high-power water-cooled frequency converter system. The water-cooled filter cabinet reduces input high-order
harmonics for
smoothing filtering and suppresses the
harmonic disturbance caused by ultra-long-distance input in a parallel system of bridge legs. The water-cooled excitation winding system cabinet realizes single / double sets of three-phase 6-pulse
silicon controlled
rectifier excitation winding system functions through different
assembly modes of a
silicon controlled
rectifier module. The scheme of the invention can effectively suppress the
harmonic interference caused by the ultra-long-distance input of the parallel system of bridge legs, balance the input current of the bridge leg parallel frequency converter, effectively improve the space utilization, and further provide a more stable operation condition for a frequency converter based on a double-leg
power unit system.