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Three-phase/biphase coordinates conversion circuit for frequency changer

A technology of coordinate transformation and frequency converter, which is applied in the output power conversion device, the conversion of AC power input to AC power output, electrical components, etc. The effect of saving resources, improving real-time processing capabilities, and improving responsiveness

Active Publication Date: 2009-05-27
JIAOZUO HUAFEI ELECTRONIC & ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the central processing unit DSP needs to process multiple operational tasks in real time through programming, such as the acquisition, calculation, communication, and generation of PWM waves of multiple signals such as power synchronization signals, current signals, and bus voltage signals, it takes up most of the resources of the DSP. Therefore, the inverter has high requirements on the real-time processing capability of DSP, and the improvement of DSP's real-time processing capability usually starts from the performance of DSP itself, such as adding a multi-processing system, but its technical difficulty is very high, and the investment cost is also high.

Method used

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  • Three-phase/biphase coordinates conversion circuit for frequency changer
  • Three-phase/biphase coordinates conversion circuit for frequency changer
  • Three-phase/biphase coordinates conversion circuit for frequency changer

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Embodiment Construction

[0013] figure 1 It is the schematic diagram of the three-phase / two-phase coordinate transformation circuit of the present invention. The three-phase / two-phase coordinate transformation circuit of the present invention adopts the combination of the differential proportional operator, the same-phase proportional operator and the same-phase sum operator to complete the U under the static coordinate system. a , U b , U c The three-phase voltage signals are equivalently converted into voltage signals in the VD+ and VQ+ two-phase static coordinate system. The transformation circuit is composed of two differential proportional operators, an in-phase proportional operator and an in-phase sum operator; under the stationary coordinate system U a , U b The two-phase voltage is connected to a differential proportional calculator, and the differential proportional calculator is connected to the same-phase proportional calculator and the same-phase summation calculator; in the static co...

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Abstract

The invention provides a three-phase / two-phase coordinate conversion circuit for a frequency converter. The conversion circuit consists of two differential proportion arithmetic units, an in-phase proportion arithmetic unit, and an in-phase summation arithmetic unit; under a static coordinate system, two phase voltages, namely Ua and Ub are connected with one differential proportion arithmetic unit, and the differential proportion arithmetic unit is connected with the in-phase proportion arithmetic unit and the in-phase summation arithmetic unit; and under the static coordinate system, the two phase voltages, namely the Ua and the Ub are connected with the other differential proportion arithmetic unit, and the differential proportion arithmetic unit is connected with the in-phase proportion arithmetic unit and the in-phase summation arithmetic unit. The circuit utilizes an electronic circuit to solve the problem that three phase voltage signals under the static coordinate system are equivalently transformed into two phase voltage signals under the static coordinate system, saves the resource of a central processing unit, improves the real-time processing capacity of the central processing unit of the frequency converter, enhances the implementation of a system, and improves the response speed of the frequency converter.

Description

technical field [0001] The invention relates to a three-phase / two-phase coordinate transformation circuit, in particular to a three-phase / two-phase coordinate transformation circuit used on a frequency converter. Background technique [0002] In the industrial inverter technology, the equivalent conversion of the three-phase voltage signal in the static coordinate system to the two-phase voltage signal in the static coordinate system is usually carried out by software. In the frequency converter, the central processing unit DSP is generally used to process the three-phase voltage signal. Since the central processing unit DSP needs to process multiple operational tasks in real time through programming, such as the acquisition, calculation, communication, and generation of PWM waves of multiple signals such as power synchronization signals, current signals, and bus voltage signals, it takes up most of the resources of the DSP. Therefore, the inverter has high requirements on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M5/00
Inventor 张福贵靳宝会李晓光王朝阳许少华朱强力
Owner JIAOZUO HUAFEI ELECTRONIC & ELECTRIC CO LTD
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