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Matrix converter space vector modulation method

A technology of space vector modulation and matrix converter, which is applied in the direction of conversion of AC power input to AC power output, conversion of AC power input to DC power output, output power conversion device, etc. The effect of the number of phases

Inactive Publication Date: 2010-01-20
MEIDENSHA ELECTRIC MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] 1. Prohibit commutation from the input maximum voltage phase to the minimum voltage phase and from the minimum voltage phase to the maximum voltage phase
[0018] 2. The input minimum voltage phase is not connected to the maximum voltage phase of the output voltage command, and the input maximum voltage phase is not connected to the minimum voltage phase of the output voltage command

Method used

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Examples

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no. 1 example

[0069]Using the conventional AC / DC / AC virtual indirect conversion method in the same manner as described in Non-Patent Document 3, the switching load of the matrix converter is calculated. The calculated virtual indirect conversion switching mode is converted to the switching mode and load of the direct conversion including the switching state that cannot be utilized in the virtual indirect conversion mode and is reconfigured using accompanying information such as during Loads and sectors that are switched according to the switching pattern per unit control time.

[0070] First, a method will be described below in which the five switching patterns and their loads obtained in the virtual indirect conversion method are converted into switching patterns and loads in the AC / AC direct conversion method. Figure 8 An example is shown in which the output voltage space vector behaves in all switching patterns (27 patterns) when the input phase voltage phase is 15 degrees. It is assum...

no. 2 example

[0143] In this embodiment, switching patterns and updating of loads are performed as follows. If the switching pattern is changed when the input sector changes by +1 or the output sector changes by ±1, the initial value of the corresponding switching pattern (the switching pattern to be output near the lower vertex of the carrier) and its final value (in the Any of the switching patterns to be output near the upper vertex) is always the same pattern.

[0144] Therefore, in the case where the switch connected to the output phase is changed when updating the switching mode, the above updating is stopped, and the previous mode is latched and outputted again. Then, the switch change when updating the switching pattern is prevented by updating the switching pattern that has not been updated in the previous time at one of the vertices of the triangular wave in the future. It should be noted that in the case where the input sector and the output sector are changed at the same time, ...

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Abstract

To provide a space vector modulation method for a matrix converter which uses only one carrier for three phases upon carrier comparison. Provided is a matrix converter space vector modulation method which PWM-controls bidirectional switches (SW1 to SW9) of a matrix converter (3) by space vector modulation from a multi-phase AC power source. A switching pattern using a virtual indirect space vector is converted into a switching pattern formed by a combination of five vectors using direct conversion space vectors. Among the converted switching patterns, a switching pattern satisfying a predetermined condition is selected and duties of the five vectors of the selected switching pattern are calculated by using a duty relationship expression of the direct conversion space vectors. The matrix converter is PWM-controlled according to the calculated duties.

Description

technical field [0001] The present invention relates to an AC-AC direct conversion device (matrix converter) configured to obtain a polyphase output from a polyphase AC power source to an arbitrary voltage or frequency, and in particular to a A space vector modulation method for representing space vectors - the magnitude and phase of these space vectors change moment by moment at their input and output, respectively, and for load calculations by means of the selected base vectors to be used. Background technique [0002] Such a matrix converter that conventionally exists is a conversion device in which a bidirectional switch using a self-commutation semiconductor element changes at a high speed to convert a single-phase or multi-phase AC input into power having an arbitrary voltage or frequency , and constructed as figure 1 shown. [0003] figure 1 Represents the basic construction of a three-phase / three-phase matrix converter. A three-phase AC power supply 1 is connecte...

Claims

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Application Information

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IPC IPC(8): H02M5/297
CPCH02M5/293H02M5/297H02M2007/53876H02M7/53876
Inventor 漆畑正太只野裕吾
Owner MEIDENSHA ELECTRIC MFG CO LTD
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