Single-phase voltage-dividing multilevel unit-in-series high-voltage converter

Abstract

The invention discloses a single-phase voltage-dividing multilevel unit-in-series high-voltage converter, comprising a single-phase voltage-dividing input isolation transformator (1), a single-phase current-changing power unit (2) and a centralized control unit (3). The input side of the single-phase voltage-dividing input isolation transformator (1) is connected with a triphase high voltage source and the output side thereof is connected with the single-phase current-changing power unit (2); the single-phase current-changing power unit (2) is connected with the centralized control unit (3) by an optical fiber (4); the single-phase voltage-dividing input isolation transformator (1) converts the triphase high voltage source to single-phase input source; and the single-phase current-changing power unit (2) inverts the single-phase input source under the control of the centralized control unit (3) and output high triphase output voltage with adjustable frequency. The high-voltage converter has the advantages of large capacity, small volume and simple structure.

Description

technical field [0001] The invention relates to a high-voltage frequency converter used for frequency conversion of a high-voltage power supply, belonging to the application field of high-voltage and high-power power electronics. Background technique [0002] According to the national report "Research on Industrialization Approaches and Countermeasures of Electric Motor Speed ​​Regulation Technology", 66% of China's total power generation is consumed by electric motors, and China's current total installed capacity of electric motors has exceeded 400,000 megawatts, and high-voltage electric motors account for about half. . Due to factors such as design margin, working condition requirements, and load changes, many high-voltage motors have the phenomenon of large horses and small carts, which waste a lot of electric energy. Therefore, using high-voltage frequency converters for speed regulation and energy saving has become the direction of national industrial development. . ...

AI Technical Summary

Problems solved by technology

[0003] High-voltage inverters are high-tech, high-complexity, and difficult power electronic products. The high-voltage inverters that are maturely used in China are multi-level unit series structures, and each power unit is a small three-phase to single-phase inverter. Its structure is complex and bulky

At present, for the high-voltage inverter based on the principle of multi-voltage unit series voltage source, its topology structure is composed of three-phase to single-phase power units instead of single-phase commutation power units. High-voltage inverter based on the principle of multi-level unit series voltage source

Images