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Direct-current transformer current interruption control method

A DC transformer and current discontinuous technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve the large switching loss of trailing current, large operating loss, limiting power module transmission efficiency, etc. problem, to achieve the effect of reducing the frequency of the switching device and reducing the high on-state loss

Pending Publication Date: 2022-05-24
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

However, when the power is low, due to the nonlinear characteristics of the switching devices, the on-state resistance of each switching device is high and the operating loss is large, which limits the transmission efficiency of the power module.
In addition, due to the carrier recombination effect of the switching device, the switching device has the problem of large tail current and high switching loss, which limits the further improvement of the transmission efficiency of the power module.

Method used

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  • Direct-current transformer current interruption control method

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Embodiment Construction

[0021] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0022] The DC transformer of the present invention is as figure 1 shown. The DC transformer is composed of N series resonant dual active bridge converters, and the value of N ranges from 3 to 15; each series resonant dual active bridge converter is used as a power module; the DC transformer , N power modules have the same structure, N power modules have the same structure, and the high-voltage side energy storage capacitor C of each power module H1 The capacitance value is the same, the low-voltage side energy storage capacitor C of each power module L1 The capacitance value is the same, the high frequency transformer T of each power module FH1 The voltage transformation ratio, leakage inductance and magnetic core material are the same. Each power module consists of a high-voltage side energy storage capacitor C H1 , high-voltage side H bridge un...

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Abstract

The invention relates to a current interruption control method for a direct-current transformer. The direct-current transformer is formed by connecting inputs of a plurality of resonant dual-active bridge converters in series and connecting outputs of the resonant dual-active bridge converters in parallel. In the operation process, according to the transmission power and by means of the capacitor voltage of the high-voltage side of each power module, part of the power modules are alternately selected to be put into operation, and switching devices of the other power modules are locked. Compared with the prior art, the operation loss of the power semiconductor device can be effectively reduced, so that the electric energy transmission efficiency of the system is improved.

Description

technical field [0001] The invention belongs to the field of direct current power distribution, and in particular relates to a method for intermittent control of a direct current transformer. Background technique [0002] In recent years, the emergence of multiple types of distributed energy, energy storage equipment and DC power loads has prompted the diversified development of traditional AC power distribution systems. Compared with the traditional AC distribution system, the energy interaction between renewable energy and DC load can be directly realized by constructing a DC distribution network, thereby saving a lot of power conversion links, reducing costs, reducing losses, and improving power transmission efficiency. In addition, the DC distribution network has the advantages of larger power supply capacity, longer power supply radius, less prominent power quality problems, and no reactive power compensation problems. [0003] In the DC power distribution system, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/3353Y02B70/10
Inventor 张航李子欣高范强徐飞赵聪王平
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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