Direct-current transformer control method and device based on ISOP-DAB structure

Abstract

The invention relates to the technical field of high-power direct-current transformers, and discloses a direct-current transformer control method and device based on an ISOP-DAB structure. The method comprises the following steps: determining the master-slave relationship of a plurality of DAB modules of a transformer, taking the actually grounded DAB module as a master module, taking the remaining DAB modules as slave modules, calculating the phase shift amount of the master module according to the acquired system output voltage, calculating the phase shift amount of each slave module according to the phase shift amount of the master module and the acquired output high-frequency current of the DAB modules, and further converting the phase shift amount of the slave module into a driving pulse to act on the corresponding DAB module. According to the invention, stable output voltage can be ensured, the voltage-sharing and current-sharing effects are realized, the method is suitable for multiple modules, the isolation problem in control is completely eliminated, collection of high-voltage signals at the series side is avoided, the difficulty in signal collection is greatly reduced, and the method and the device are simple in architecture, easy to realize and high in practicability.

Description

technical field [0001] The invention relates to the technical field of high-power DC transformers, in particular to a DC transformer control method and device based on an ISOP-DAB structure. Background technique [0002] Generally speaking, the voltage on the medium-voltage side of DC transformers is generally higher than 10kV, and even though power semiconductor devices have undergone several updates, the voltage level continues to increase, the capacity continues to increase, and the performance has also been greatly enhanced, but its development is still in line with the requirements of the power grid. There is a big gap, so in the face of the demand for high-voltage and high-power applications in power systems, it is even more necessary to conduct research on circuit topology so that DC transformers can withstand medium and high voltages in the power grid. For some special applications with high input voltage and high output current, a variety of DC-DC converter topologi...

AI Technical Summary

Problems solved by technology

[0010] The invention provides a DC transformer control method and device based on the ISOP-DAB structure, which solves the problems of unstable output voltage, inability to achieve voltage equalization and current equalization, and unsuitability for multi-module and control in existing DC transformers based on the ISOP-DAB structure. Technical issues with isolated defects

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