ISOP type direct-current distribution transformer and control method thereof

Abstract

The invention relates to an ISOP type direct-current distribution transformer and a control method thereof. The ISOP type direct-current distribution transformer comprises n cascaded sub-modules, wherein each sub-module comprises a double-Buck circuit, a half-bridge converter, a high-frequency transformer and a full-bridge converter; one end of the primary side of the high-frequency transformer isconnected with the double-Buck circuit, the other end is connected with the half-bridge converter, and the secondary side of the high-frequency transformer is connected with the full-bridge converter. According to the technical scheme provided by the invention, the n cascaded sub-modules are adopted, and each sub-module comprises a double-Buck circuit, a half-bridge converter, a high-frequency transformer and a full-bridge converter, the problems of low reliability and poor DC fault inhibition capability in the direct-current power distribution network in the prior art are solved, the fault processing capability is improved, the high-frequency operation is realized, the power density of the device is improved, and more convenient conditions are provided for the application of the direct-current power distribution network in the future.

Description

technical field [0001] The invention relates to the technical field of energy management of an intelligent distribution network, in particular to an ISOP type DC distribution transformer and a control method thereof. Background technique [0002] With the development of power electronics technology, due to the advantages of low line cost, low power loss, high power supply reliability and low grid connection cost of new energy such as wind power, DC transmission and distribution technology has become a research hotspot in the electrical field. . In the process of DC power distribution, it is necessary to realize energy exchange and electrical isolation between grids of different voltage levels, so DC transformers play an important role in DC power distribution technology. DC power distribution technology started late, and the research on DC transformers in various countries is still in the exploratory stage. It is difficult for DC transformers to achieve voltage conversion t...

AI Technical Summary

Problems solved by technology

[0004] The invention provides an ISOP type DC distribution transformer and its control method. Its purpose is to solve the problems of low reliability and weak suppression ability of DC faults in the prior art in the DC distribution network. The cascaded n and the sub-module includes a double Buck circuit, a half-bridge converter, a high-frequency transformer and a full-bridge converter, which improves the fault handling capability, realizes high-frequency operation, improves the power density of the device, and provides future DC distribution network The application provides more convenient conditions

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