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Current source type high-frequency isolation matrix cascade converter and control method

A matrix converter, cascade converter technology, applied in the direction of AC power input conversion to AC power output, irreversible AC power input conversion to DC power output, energy industry and other directions, can solve the problem of current source soft switching technology research. There are many problems such as large loss of current source matrix converters, etc., to achieve the effects of improving reliability and power density, increasing output voltage and reducing system volume.

Active Publication Date: 2021-07-20
SOUTHEAST UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Most of the traditional matrix converter soft switching technologies are aimed at voltage source converters. There are not many studies on current source soft switching technology. Using soft switching technology can effectively solve the disadvantage of large loss in current source matrix converters.

Method used

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  • Current source type high-frequency isolation matrix cascade converter and control method
  • Current source type high-frequency isolation matrix cascade converter and control method
  • Current source type high-frequency isolation matrix cascade converter and control method

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Embodiment Construction

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0054] Such as figure 1 As shown, a current source type high-frequency isolation matrix cascaded converter includes three-phase grid 1.1, LC filter 1.2, two sets of matrix converters (1.3, 1.4), leakage inductance (1.5, 1.6), high frequency Isolation transformers (1.7, 1.8), two sets of uncontrolled rectifier bridges (1.9, 1.10), and resistive inductive loads (1.11, 1.12).

[0055] The three-phase grid 1.1 is connected to an LC filter 1.2;

[0056] The LC filter ...

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Abstract

The invention discloses a current source type high-frequency isolation matrix cascade converter and a control method thereof, and the method comprises the steps: enabling a three-phase AC power grid to be connected with two current source type matrix converters for electric energy transmission after LC filtering; connecting the primary side input end of the high-frequency isolation transformer with the matrix converter in series, the secondary side output end with the uncontrolled rectifier bridge, the alternating current sides of the two sets of current source type high-frequency isolation matrix cascade converters being connected in parallel and sharing the LC filter, and the direct current output sides being connected in series with the resistance-inductance load. In the system, a power frequency alternating current is converted into a high-frequency alternating current form through the three-phase / single-phase direct matrix converter, a direct-current bus capacitor is removed, the system failure rate is reduced, the power conversion stage number is reduced, and the system size is greatly reduced. According to the control technical scheme, a matrix converter device switch is flexible, the problem of electromagnetic interference caused by high-frequency work of a switching device is suppressed, industrial requirements of offshore wind power generation, electric vehicle charging and the like are met, and the application prospect is wide.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a current source type high frequency isolation matrix type cascaded converter and a control method. Background technique [0002] Wind energy (onshore and offshore) is one of the most important energy sources in renewable energy power generation systems. At present, with the continuous development of offshore wind power generation, the power of the power transmission system is constantly increasing, and the size of the corresponding converter is also expanding. The power frequency transformer in the traditional permanent magnet synchronous generator wind energy system is bulky, and the traditional generator in the wind energy system is mainly composed of fan impeller, three-stage gearbox, synchronous generator, bidirectional PWM rectifier and other components. However, the traditional transformers in this system have large weight and volume, small power capacity, and poor con...

Claims

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Application Information

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IPC IPC(8): H02M5/293H02M7/06
CPCH02M5/293H02M5/225H02M7/06Y02P80/20
Inventor 王政吴佳丽徐阳
Owner SOUTHEAST UNIV
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