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In-phase laminated carrier wave modulation method for multi-module matrix converter

A matrix converter and carrier modulation technology, 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., can solve the problem of low voltage transmission ratio, large calculation amount, Not easy to expand and other issues

Active Publication Date: 2015-09-02
CENT SOUTH UNIV
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Problems solved by technology

[0005] The invention provides an in-phase stacked carrier modulation method of a multi-module matrix converter, which solves the problems of low voltage transmission ratio, complex modulation process, large calculation amount and difficult expansion in the existing modulation method.

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  • In-phase laminated carrier wave modulation method for multi-module matrix converter
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  • In-phase laminated carrier wave modulation method for multi-module matrix converter

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Embodiment Construction

[0051] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0052] The structure of multi-module matrix converter is as follows figure 1 shown. The multi-module matrix converter includes a multi-winding transformer 1 and a power module unit 2; the multi-winding transformer is a common isolation transformer (non-phase-shifting transformer), which provides an independent power supply for each power module unit, and the power module unit includes an input filter Capacitor 3 and six sets of bidirectional power switches 4 realize three-phase-single-phase direct AC-AC conversion, and each power module unit provides a three-phase symmetrical power supply with adjustable amplitude and frequency for the load through cascade connection.

[0053] The carrier modulation method specifically includes the following steps:

[0054] Step 1: Decomposing the multi-module matrix converter into cascaded N three-module ...

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Abstract

The invention discloses an in-phase laminated carrier wave modulation method for a multi-module matrix converter. The method is characterized in that the modulated wave of each module is determined according to the range where a system modulated wave is in; and a carrier wave modulation method of a double-side-symmetric non-isoceles triangle carrier wave-type is adopted for each module. The modulation idea comes from that functions of a three-module matrix converter includes that of a full bridge indirect matrix converter, a modulation algorithm of the full bridge indirect matrix converter is combined, the space vector modulation is adopted for the rectification grade, the in-phase laminated carrier wave modulation is adopted for the inversion grade, and the state of each switch of the three-module matrix converter is determined through the corresponding relation of mathematical models of the three-module matrix converter and the full bridge indirect matrix converter. The modulation method provided by the invention is low in computational complexity and easy to expand; the switch change-over frequency is greatly lowered, the system efficiency is improved; the output voltage level can be smoothly switched; and the output current waveform quality is good.

Description

technical field [0001] The invention belongs to the technical field of medium and high voltage AC power conversion devices, and in particular relates to an in-phase stacked carrier wave modulation method of a multi-module matrix converter in the field of medium and high voltage three-phase AC frequency conversion. Background technique [0002] Medium and high-voltage high-power AC motors are the main driving force in the industry at present, and the energy consumed by them accounts for more than 70% of the total energy consumption of the motors. The application of medium and high-voltage frequency converters makes the power saving rate of motors such as fans and pumps reach 30%- 60%, the energy saving effect is quite obvious. At the same time, the medium and high voltage frequency converter realizes stepless speed regulation, which meets the speed regulation performance requirements of the motor in the industrial production process and improves the output and quality of prod...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M7/219H02M7/5387
Inventor 孙尧熊文静但汉兵张关关杨建韩华彭涛王春生
Owner CENT SOUTH UNIV
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