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

Abstract

The invention provides a high power cascade type diode H-bridge unit power factor rectifier. The high power cascade type diode H-bridge unit power factor rectifier comprises a plurality of dominant power circuits, wherein each dominant power circuit is composed of a plurality of module unit cascades; meanwhile, the high power cascade type diode H-bridge unit power factor rectifier further comprises a plurality of application circuits in three-phase star connection, angle joint or dual star connection. Due to the fact that each dominant power circuit is composed of a plurality of module unit cascades, power switch tubes with low voltage tolerance can be used to achieve high power rectifier alternating under high voltage, besides, a power frequency phase-shifting transformer which is huge, heavy and complex in wiring is not needed, topology structure of the dominant power circuit is simplified, using of switching elements is greatly reduced, and then consumption of the circuit in working is lowered, working efficiency of the system is improved, size is small, weight is light, and cost is low. The high power cascade type diode H-bridge unit power factor rectifier has an important application value in fields of high voltage direct current transmission, high-power power electronic transformer, high power middle-high voltage alternating current-direct current- alternating current and the like.

Description

technical field [0001] The invention relates to a rectifier, in particular to a high-power cascaded diode H-bridge unit power factor rectifier. Background technique [0002] With the rapid development of science and technology and industrial modernization and the requirement for energy conservation, medium and high voltage power electronic converters used in high-power applications play an increasingly important role. In recent years, multilevel power converters (Multilevel Converter) have been successfully applied in the fields of high-voltage and high-power frequency conversion speed regulation, active power filter devices, high-voltage direct current (HVDC) transmission systems, and reactive power compensation of power systems. The basic circuit topologies of multilevel converters mainly include diode clamping, flying capacitor, and power unit cascading circuits. Among them, the power unit cascaded multilevel converter has become the mainstream of the market because of i...

AI Technical Summary

Problems solved by technology

However, the main circuit topology of this type of rectifier requires many switching devices, and the loss in the main circuit operation process is relatively large, and the design of the control circuit and control method for all switching devices is also very complicated.

Images