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Isolated AC-DC matrix converter optimized current stress control method

A matrix converter, the technology of current stress, applied in the direction of converting DC power input to DC power output, AC power input converting to DC power output, control/regulation system, etc., can solve the problem of isolated three-phase AC-DC matrix converter Less involved and other issues, to achieve good input and output performance, fast response, small overshoot effect

Pending Publication Date: 2022-08-05
XIANGTAN UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on current stress mainly focuses on the bidirectional full-bridge DC-DC converter, while the research on the isolated three-phase AC-DC matrix converter rarely involves

Method used

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  • Isolated AC-DC matrix converter optimized current stress control method
  • Isolated AC-DC matrix converter optimized current stress control method
  • Isolated AC-DC matrix converter optimized current stress control method

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Embodiment Construction

[0042] like figure 1 As shown, this embodiment adopts an isolated AC-DC matrix converter, which is composed of a three-phase AC power supply, an input LC filter, a three-phase-single-phase matrix converter, a transmission inductor, a high-frequency transformer, and an H-bridge converter. It consists of a device, an output LC filter, and a DC active load. The main function of the three-phase-single-phase matrix converter is to convert the three-phase grid voltage into a positive and negative alternating high-frequency pulse voltage, and the H-bridge converter converts the high-frequency pulse voltage into a DC voltage. The high-frequency transformer mainly plays the role of electrical isolation. Three-phase-single-phase matrix converters, H-bridge converters and high-frequency transformers can all achieve bidirectional flow of energy.

[0043] like figure 2 As shown, the isolated AC-DC matrix converter uses dual phase shift control. Therefore, there are two phase shift rat...

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Abstract

The invention discloses a method for optimizing current stress through dual phase shift control of an isolated AC / DC matrix converter. Comprising the following steps: firstly, analyzing a working principle of an isolated AC / DC matrix converter under dual phase shift control, deriving inductive current stress and transmission power of the converter under a dual phase shift control mode, establishing a mathematical model of the inductive current stress and the transmission power by adopting a Lagrangian condition extremum, deriving a voltage regulation ratio, and calculating the voltage regulation ratio of the isolated AC / DC matrix converter; and a mathematical expression between the modulation coefficient and the phase shift ratio. And finding out a parameter combination enabling the inductive current stress to be minimum according to the expression. The control method provided by the invention can ensure that the input and output performance of the converter is not affected, can reduce the current stress of the isolated AC-DC matrix converter, and improves the transmission efficiency of the converter.

Description

technical field [0001] The invention relates to the field of matrix converter control, in particular to an optimized current stress control method for an isolated AC-DC matrix converter. Background technique [0002] The single-stage bidirectional isolated three-phase AC / DC matrix converter is a new type of converter derived from the two-stage topology consisting of a non-isolated three-phase AC / DC converter and an isolated DC / DC converter. device. It has the advantages of small size, small weight, adjustable input power factor, two-way energy transmission, high power density, and no intermediate energy storage links. It has good applied research value in the fields of electric vehicle V2G technology, new energy power generation, battery energy storage, and hybrid microgrid. [0003] Isolated three-phase AC / DC matrix converter is mainly composed of three-phase-single-phase matrix converter and H-bridge converter. Because there is no intermediate decoupling capacitor, isol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02M3/335
CPCH02M7/797H02M3/33584Y02B70/10
Inventor 王纯邓文浪耿振嘉
Owner XIANGTAN UNIV
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