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Alternating current governing system for twin-stage matrix converter having anti-losing capability

A matrix converter, AC speed regulation technology, applied in the direction of AC power input conversion to AC power output, control system, AC motor control, etc.

Inactive Publication Date: 2010-10-13
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has not been any report on the AC speed control system that is still under development and is composed of a two-stage matrix converter, which has the ability to overcome voltage drops, that is, has the ability to cross-drop.

Method used

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  • Alternating current governing system for twin-stage matrix converter having anti-losing capability
  • Alternating current governing system for twin-stage matrix converter having anti-losing capability
  • Alternating current governing system for twin-stage matrix converter having anti-losing capability

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Embodiment 1

[0025] like figure 1 , figure 1 Described is an AC speed control system composed of a two-stage matrix converter, which consists of a three-phase power supply 1, a filter circuit 2, a three-phase PWM rectifier circuit 3, a clamp circuit 41, a PWM inverter circuit 5 and an induction motor 6.

[0026] Obviously, different from the traditional AC speed control system, the three-phase upper and lower bridge arms of each phase of its rectification stage are coupled by two IGBTs and two diodes 34 to form a circuit in which current can flow in both directions; the middle DC The terminal connected to the rectification stage and the inverter stage is a clamping circuit 41 composed of a capacitor 8 and a diode 35 . In addition, it also has an input filter composed of a three-phase capacitor 18 and an inductance 17 connected to the three-phase power supply 16 . Due to the lack of large capacitors and inductors in the middle, the system appears compact. In fact, compared with the tradit...

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Abstract

The invention provides an alternating current governing system for a twin-stage matrix converter having an anti-losing capability, which is formed by one by one connecting a three-phase power supply, a filter circuit, a three-phase PWM rectification circuit, an anti-losing circuit, a PWM inversion circuit and an induction motor. The anti-losing circuit comprises a main circuit and a control circuit and is formed by adding some assisting elements based on a middle direct current clamping circuit of the prior twin-stage matrix converter. The anti-losing circuit hardware comprises three IGBT, three diodes, an inductor and a capacitor. The invention can maintain the system property of the driving system of the twin-stage matrix converter while ensure the normal work of the system under the condition of falling the power grid and the voltage.

Description

technical field [0001] The invention belongs to the technical field of AC speed regulation, and relates to an AC speed regulation system of a double-stage matrix converter with crossover capability. technical background [0002] Matrix converter is a research hotspot in the field of power electronics in the past ten years. It has many excellent characteristics, such as bidirectional energy flow, sinusoidal input and output current, controllable input power factor, and no need for large-capacity energy storage components. Small. In particular, the double-stage matrix converter developed on the basis of the single-stage matrix converter not only has the excellent characteristics of the single-stage matrix converter, but also overcomes the large clamping circuit and commutation control of the single-stage matrix converter. Complicated and other deficiencies, it has become a kind of power converter with the most development potential at present. In many application occasions, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06H02M5/458
Inventor 粟梅孙尧于晶荣刘见韩华王辉桂卫华危韧勇王一军李幸周锋罗朝旭
Owner CENT SOUTH UNIV
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