A flexible switchgear for connecting two DC power distribution systems

Abstract

The invention discloses a flexible switch device for connecting two DC power distribution systems. The device comprises a transformation unit, a detection unit and a control unit, wherein the transformation unit is used for connecting with two DC power distribution systems and performing transformation or isolation processing on the DC power distribution systems which are connected to two sides of the switch device, the detection unit is electrically connected with the transformation unit and is used for detecting bus voltages of the DC power distribution systems, and the control unit is connected with the transformation unit and the detection unit and is used for controlling the transformation unit to be in different working modes according to a detection result of the detection unit. By the flexible switch device, direct connection of different DC power distribution systems and bidirectional flow of energy are achieved, optimal configuration of energy among microgrids is ensured, the running of a plurality of DC microgrids is coordinated, the problem of effective fault isolation of a single microgrid is solved, and the system reliability is improved.

Description

Technical field [0001] The invention relates to the field of electric power technology. More specifically, it relates to a flexible switch device for connecting two DC power distribution systems. Background technique [0002] Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, loads and other devices according to certain operating rules. Since the traditional power system is an AC system, considering the access problem of the microgrid, the AC microgrid has received more attention and rapid development. However, there are a large number of DC micro power sources and DC loads in the microgrid system. If only the AC microgrid is used to connect distributed power sources to supply power to the load, a large number of multi-level converters are required to transform the form of electrical energy, which not only reduces the electrical energy The efficiency of transmission will also reduce the reliability...

AI Technical Summary

Problems solved by technology

This connection method makes the energy scheduling between DC microgrids very complicated, and the transmission efficiency is low

If the DC microgrids are directly connected, when one of the DC microgrids fails, it will affect other DC microgrids and weaken the stability of the system.

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