Topology and modulation method of single-phase current-type high-frequency chain-matrix power electronic transformer

A high-frequency transformer and power electronics technology, applied in the direction of converting AC power input to AC power output, electrical components, output power conversion devices, etc., can solve the problems of environmental pollution of insulating oil, affecting normal operation, and high no-load loss. Achieve the effect of reducing switching loss, improving efficiency, and suppressing voltage spikes

CN110212781BActive Publication Date: 2021-01-29YANSHAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-01-29

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Abstract

The invention discloses a single-phase current type high frequency chain matrix power electronic transformer topology and modulation method. The topology includes a sequentially connected power supply network, a front-stage matrix converter, a high-frequency transformer, a post-stage matrix converter, an output filter, and a load, using a high-frequency transformer for magnetic coupling and power transfer, and using a current-mode circuit topology to achieve the output voltage and frequency conversion. In order to make the bidirectional switch of the matrix converter work reasonably, a decoupling and coupling modulation strategy is proposed, which combines the integral unipolar frequency multiplication of the front-stage circuit of the transformer and the discrete type of the rear-stage circuit. The front stage adopts the integral control method to realize the safe commutation of the matrix converter, effectively suppressing the voltage peak caused by the transformer leakage inductance; the latter stage adopts the discrete control method to reduce the number of switching operations and reduce the device The switching loss improves the system efficiency. And a detailed modal analysis is carried out on the modulation principle and the working state of the main circuit.
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Description

technical field

[0001] The invention relates to the field of power electronic power converter topology and its modulation, in particular to a single-phase current-type high-frequency chain matrix power electronic transformer topology and modulation method. Background technique

[0002] In the traditional power grid, the distribution network transformer plays a very important role as a device for voltage level conversion and energy transmission. Traditional power transformers have the advantages of simple structure, high reliability, and low cost. At the same time, traditional power electronic transformers have many disadvantages: large volume, heavy weight, high no-load loss, and environmental pollution caused by the use of insulating oil; traditional distribution network transformers couple AC voltage from the primary side to the secondary side through the iron core and windings. side, in order to realize the transformation of the voltage level. At the same time, the wind...

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Embodiment Construction

[0029] 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 making creative efforts belong to the protection scope of the present invention.

[0030] The purpose of the present invention is to provide a single-phase current-type high-frequency chain matrix power electronic transformer topology and modulation method, which can realize the output of stable AC voltage, and can also realize the output of AC voltage with variable frequency. The front stage eliminates the voltage peak on the primary side of the transformer by using the current-type integral unipolar frequency multiplication SPWM modulation ...