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Modulation method capable of inhibiting three-phase five-phase matrix converter common-mode voltage

A matrix converter and common-mode voltage technology, applied in the field of power electronic power converter control, can solve the problems of increasing the volume, weight and loss of the converter, increasing the number of switches and switching losses, etc., achieving strong applicability and reducing switching. frequency, switching loss, and common mode voltage reduction effect

Inactive Publication Date: 2016-02-03
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

[0007] The first two methods undoubtedly increase the volume, weight and loss of the converter to varying degrees; while the latter method increases the number of switching times and switching losses.

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  • Modulation method capable of inhibiting three-phase five-phase matrix converter common-mode voltage
  • Modulation method capable of inhibiting three-phase five-phase matrix converter common-mode voltage
  • Modulation method capable of inhibiting three-phase five-phase matrix converter common-mode voltage

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Embodiment Construction

[0032]The technology of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] refer to figure 1 and figure 2 , u a , u b , u c and i a i b i c respectively represent the three-phase input phase voltage and input current; u A , u B , u C , u D , u E and i A i B i C i D i E Indicate the five-phase output voltage and output current respectively; S jk (j=A,B,C,D,E; k=a,b,c) represents figure 1 Connect the bidirectional power switch corresponding to the input and output phases; S kw (k=a,b,c; w=p,n) represents figure 2 The bidirectional power switch corresponding to the virtual rectifier (1) in the middle; S jw (j=A,B,C,D,E; w=p,n) represents figure 2 The bidirectional power switch corresponding to the virtual inverter (2). refer to image 3 , in practical applications, bidirectional switches are composed of independent power electronic switching devices.

[0034] Since the input side of th...

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Abstract

The invention relates to a modulation method capable of inhibiting a three-phase five-phase matrix converter common-mode voltage. An indirect conversion method is utilized, a three-phase five-phase matrix converter is equivalent to a virtual rectifier and a virtual inverter, for the virtual rectifier, an input phase voltage is divided into six zones, two linear voltages which are the largest ones and are positive in each zone are selected to synthesize to output a DC voltage, and no zero-voltage output occurs; for the virtual inverter, application space voltage vector modulation is realized, ten large vectors, ten middle vectors and two small vectors outputted by the virtual inverter are divided into ten sectors, only two large vectors and two middle vectors are selected from the sectors to synthesize a reference vector, and thereby a switch modulation mode of the virtual rectifier and the virtual inverter are respectively derived. As verified, on the conditions that, input and output are guaranteed to be sine waves and the input power factor is 1, so the common-mode voltage can be effectively reduced by 27.9%.

Description

technical field [0001] The invention belongs to the control field of power electronic power converters driving five-phase motors, in particular, it relates to a modulation method for suppressing the common-mode voltage of three-phase-five-phase matrix converters. Background technique [0002] Since the matrix converter circuit contains power electronic power devices, when space vector modulation is used, the power electronic ideal switch works in a high-frequency state, the output voltage is high-frequency pulse width modulation voltage, and the common-mode voltage is the output voltage of the matrix converter The common-mode component of the load is generated at the neutral point of the load, so the common-mode voltage is also a high-frequency pulse voltage. Since power electronic devices work at high frequencies, the common-mode voltage will have a high du / dt, which will have a strong impact on the drive system of the motor, and will excite the stray capacitance and parasi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32
Inventor 王汝田母兴军杨金成陈酋锋
Owner NORTHEAST DIANLI UNIVERSITY
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