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Input-parallel output-series dual-active bridge converter and control method thereof

An output series, dual active bridge technology, used in output power conversion devices, DC power input to DC power output, control/regulation systems, etc. Modularization and other issues, to achieve the effect of easy modularization, balance of output voltage, and cost reduction

Inactive Publication Date: 2021-05-28
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For dual active bridge converters with input in parallel and output in series, each DAB converter module will not be completely consistent due to the difference in inductance parameters. lead to overload, which is not conducive to the realization of modularization

Method used

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  • Input-parallel output-series dual-active bridge converter and control method thereof
  • Input-parallel output-series dual-active bridge converter and control method thereof
  • Input-parallel output-series dual-active bridge converter and control method thereof

Examples

Experimental program
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Effect test

Embodiment

[0054] The following is an example of a dual active bridge converter with input parallel connection and output series connection composed of 26 modules, combined with simulation to verify the voltage equalization control of the dual active bridge converter with input parallel connection output series connection. The simulation parameters are as follows:

[0055] Simulation main parameters

[0056]

[0057] In order to reflect the differences among the modules, the inductance is sequentially selected from 148μH to 173μH. Due to the large number of modules, only the waveforms of the DAB converters of the 1st, 13th, and 26th modules are shown.

[0058] The output voltage simulation waveform of the DAB converter module of the dual active bridge converter with input in parallel and output in series without voltage equalization control in this embodiment is as follows Image 6 As shown, the output voltage simulation waveform of the DAB converter module with dual active bridge co...

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Abstract

The invention discloses an input-parallel output-series dual-active bridge converter and a control method thereof. The converter comprises n DAB converter modules, n is an integer greater than or equal to 2; the input ends of the n DAB modules are connected in parallel to a DC micro-grid, and the output ends of the n DAB modules are connected in series to a medium-voltage direct-current power distribution network; by the phase shift ratio of each DAB converter module is changed, so that the transmission power of the input-parallel output-series dual-active bridge converter is controlled; and the output voltage balance of each DAB converter module is realized through voltage-sharing control. According to the input-parallel and output-series dual-active bridge converter and the control method thereof, interconnection between the direct-current micro-grid and the medium-voltage direct-current power distribution network can be achieved, bidirectional flow of energy is achieved; and when parameters between the DAB converter modules are different, output voltage balance of the DAB converter modules can be achieved through voltage-sharing control.

Description

[0001] manual [0002] A dual active bridge converter with parallel input and serial output and its control method technical field [0003] The invention belongs to the technical field of power electronics, and in particular relates to a double active bridge converter with parallel input and serial output and a control method thereof. Background technique [0004] Renewable energy such as solar energy has become an important way to solve energy shortages and environmental pollution. The integration of photovoltaic power generation into the AC power grid has been a long-term technical approach, but the addition of AC-DC conversion links increases costs and reduces efficiency. With the development of DC power transmission and distribution system, the integration of photovoltaic power generation with output DC power into the DC grid has great advantages in terms of efficiency and economy, and has also attracted widespread attention. Since the voltage of the DC microgrid connec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/335H02M3/3353
Inventor 周娟王莉徐泽涵钊翔坤徐高祥李京泽原亚雷
Owner CHINA UNIV OF MINING & TECH
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