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Three-phase to N-phase alternating-current direct-type alternating-current and alternating-current converter based on single-phase transformer cascading

A technology of single-phase transformers and converters, applied in the direction of conversion equipment that can be converted to DC without intermediate conversion, output power conversion devices, electrical components, etc., to achieve current harmonic elimination, reduce complexity, low cost and volume effect

Pending Publication Date: 2022-05-27
NORTHEAST DIANLI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biggest feature of four-phase power transmission is that although the power transmission method is novel, the technology adopted is basically the same as that of the existing three-phase power transmission system, and there are no major difficulties in terms of technology

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  • Three-phase to N-phase alternating-current direct-type alternating-current and alternating-current converter based on single-phase transformer cascading
  • Three-phase to N-phase alternating-current direct-type alternating-current and alternating-current converter based on single-phase transformer cascading
  • Three-phase to N-phase alternating-current direct-type alternating-current and alternating-current converter based on single-phase transformer cascading

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Embodiment Construction

[0021] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] The present invention is based on a three-phase-to-N-phase AC direct AC-AC converter with cascaded single-phase transformers, such as figure 1 As shown, it includes three single-phase transformer converter units and N LC filters. The input end of each single-phase transformer converter unit is connected to one of the U-phase, V-phase, and W-phase of the AC input voltage. The output end of the commutation unit of the phase transformer includes N positive output ports V Z1 …V ZN and N negative output ports V F1 …V FN , each positive output port of the single-phase transformer commutation unit connected to the U-phase is connected to the inductor end of an LC filter, the capacitor ends of the N LC filters are connected to each other, and each of the single-phase transformer commutation units corresponding to U is connected to each other....

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Abstract

The invention discloses a three-phase alternating current-to-N-phase alternating current direct type alternating current-to-alternating current converter based on cascade connection of single-phase transformers. The direct type alternating current-to-alternating current converter comprises three single-phase transformer commutation units and N LC filters. The cascaded direct-type AC / AC chopper in the single-phase transformer converter unit comprises one or more direct-type AC / AC choppers. According to the invention, the three-phase AC input voltage can be converted into the N-phase AC output voltage, and the frequency, amplitude and phase of the output voltage are independently controllable. The input sides of the cascaded direct AC / AC converters are coupled through the magnetic circuit of the transformer, so that current harmonic elimination can be realized, and harmonic pollution to input current caused by introduction of the current harmonic into the primary side of the transformer is avoided. In addition, bidirectional flow of energy can be realized, and a three-phase system and an N-phase system can be interconnected.

Description

technical field [0001] The invention belongs to the technical field of electric energy conversion, and in particular relates to a three-phase-to-N-phase AC direct AC-to-AC converter based on cascade connection of single-phase transformers. Background technique [0002] Multiphase power transmission can significantly reduce the potential gradient on the surface of the conductor, which is an important method to improve the transmission power density. the result of. Compared with three-phase transmission lines, multi-phase transmission lines have many potential advantages. It has lower phase-to-phase voltage, lightweight tower structure, narrow wiring corridors, and large transmission capacity, which is easy to coordinate and compatible with three-phase existing systems. Further research and tests, such as lower requirements for the contact breaking capacity of high-voltage circuit breakers, show that environmental indicators such as audible noise, radio noise, and ground elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/10H02M1/14
CPCH02M5/10H02M1/14Y02E60/60
Inventor 刘闯蔡国伟朱炳达邵鑫铭郭东波裴忠晨姜宇孙赫阳杨冬锋刘士利
Owner NORTHEAST DIANLI UNIVERSITY
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