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Novel boost chopper cascade structure

A technology of boost chopper and cascading structure, applied in electrical components, adjusting electrical variables, controlling generators through magnetic field changes, etc., can solve the problems of stator current distortion, limiting speed regulation capability, limited system speed regulation capability, etc. Achieve the effect of increasing the speed regulation range, strong scalability and low cost

Inactive Publication Date: 2012-04-25
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this structure also has some shortcomings, such as diode rectification will cause stator current distortion, and the upper and lower limits of the conduction time of the power switch tube of the step-up chopper circuit will limit its speed regulation ability, etc.
At present, multi-pulse rectification technology or multi-phase motors are usually used at home and abroad to improve the stator current situation, but the problem of limited speed regulation ability of the system is still difficult to be solved well

Method used

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Embodiment Construction

[0016] In recent years, with the development and utilization of new energy sources, especially in variable-speed wind power generation, the speed regulation of generators has the advantages of low cost, high efficiency, and simple control system due to the structure of diode rectification followed by a step-up chopper speed regulation circuit. The advantages are widely used. However, the speed regulation range of the traditional step-up chopper circuit is narrow, which also affects its application effect. The invention proposes a cascaded structure of a step-up chopper circuit. The main circuit structure is composed of n boost chopper circuits cascaded, such as figure 1 shown. When applied to the motor speed control system, if the generator used in the system is an ordinary three-phase motor, the stator output side needs to be connected to an isolated multi-phase transformer to obtain multiple electrically isolated three-phase outputs. If the generator used in the system is ...

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Abstract

The invention belongs to the technical field of power electronics and relates to a novel boost chopper cascade structure. The novel boost chopper cascade structure comprises a boost chopper and a filter energy-storage capacitor connected with the output end of the boost chopper, wherein the boost chopper consisting of the cascade structure comprises n boost chopper units which are built accordingto a regular circuit and cascading diodes and commutation power switching tubes which are connected between the boost chopper units; and the output ends of the n boost chopper units are connected in series with one another by commutation power switching tubes. The novel boost chopper cascade structure has the advantages of simple structure and high expandability.

Description

technical field [0001] The invention belongs to the technical field of power electronics and relates to a cascaded structure of a step-up chopper circuit. The invention can be applied to the fields of motor speed regulation, renewable energy power generation and the like. Background technique [0002] The traditional step-up chopper circuit is widely used in the field of electrical transmission, such as the internal feedback cascade speed control system of the wound induction motor, the speed control system of the permanent magnet brushless DC motor, etc. Especially in recent years, with the widespread attention and application of wind power generation technology, the step-up chopper speed regulation circuit has new application space. For example, in the wind power generation system, the permanent magnet synchronous wind turbine is often used to connect the diode rectifier unit and then connect the step-up chopper circuit to the voltage-type grid-connected inverter. This str...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155H02P9/30
Inventor 夏长亮王志强史婷娜
Owner TIANJIN UNIV