High-power compensation type cascade diode H-bridge unit power factor rectifier

The invention provides a high-power compensation type cascade diode H-bridge unit power factor rectifier which comprises various main power circuits which are formed by cascading a plurality of module units in a three-phase star connection, angle connection or double-star connection mode. Meanwhile, the invention further provides a small-capacity compensation device formed through serial connection or parallel connection or series-parallel connection, and unit power factor rectification can be easily achieved. The rectifier has the advantages that a low-voltage power switch tube can be used for large-power rectification conversion under high voltage, a power-frequency phase-shifting transformer which is large, heavy and complex in wiring does not need to be used, the topological structures of the main power circuits are simplified, the number of switching devices which are used is greatly reduced, loss of the circuits in work is reduced, work efficiency of a system is improved, the size is small, the weight is low and cost is low. Meanwhile, the power factor of the rectifier always keeps to be 1 on the situation that a load is changed. The rectifier has important application value in the application field such as high-voltage direct current transmission, high-power electric and electronic transformers, high-power medium-and-high-voltage AC-DC-AC converters.